diff --git a/pkg/front_end/lib/src/api_prototype/compiler_options.dart b/pkg/front_end/lib/src/api_prototype/compiler_options.dart
index 27a7656..71901bf 100644
--- a/pkg/front_end/lib/src/api_prototype/compiler_options.dart
+++ b/pkg/front_end/lib/src/api_prototype/compiler_options.dart
@@ -299,6 +299,7 @@
   /// launched again.
   Set<Uri> runningPrecompilations = {};
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the minimum language version needed for a library with the given
   /// [importUri] to opt into the experiment with the given [flag].
   ///
@@ -328,6 +329,7 @@
             experimentReleasedVersionForTesting);
   }
 
+  // Coverage-ignore(suite): Not run.
   bool equivalent(CompilerOptions other,
       {bool ignoreOnDiagnostic = true,
       bool ignoreVerbose = true,
@@ -406,6 +408,7 @@
     for (String argument in arguments) {
       for (String feature in argument.split(',')) {
         if (feature.startsWith('no-')) {
+          // Coverage-ignore-block(suite): Not run.
           result[feature.substring(3)] = false;
         } else {
           result[feature] = true;
@@ -437,14 +440,17 @@
       bool value = experiments[experiment]!;
       ExperimentalFlag? flag = parseExperimentalFlag(experiment);
       if (flag == null) {
+        // Coverage-ignore-block(suite): Not run.
         onError("Unknown experiment: " + experiment);
       } else if (flags.containsKey(flag)) {
+        // Coverage-ignore-block(suite): Not run.
         if (flags[flag] != value) {
           onError(
               "Experiment specified with conflicting values: " + experiment);
         }
       } else {
         if (flag.isExpired) {
+          // Coverage-ignore-block(suite): Not run.
           if (value != flag.isEnabledByDefault) {
             /// Produce an error when the value is not the default value.
             if (value) {
@@ -505,6 +511,7 @@
     Set<InvocationMode> result = {};
     for (String name in arg.split(',')) {
       if (name.isNotEmpty) {
+        // Coverage-ignore-block(suite): Not run.
         InvocationMode? mode = fromName(name);
         if (mode == null) {
           String message = "Unknown invocation mode '$name'.";
@@ -521,6 +528,7 @@
     return result;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the [InvocationMode] with the given [name].
   static InvocationMode? fromName(String name) {
     for (InvocationMode invocationMode in values) {
@@ -553,10 +561,12 @@
 
   static const List<Verbosity> values = const [error, warning, info, all];
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the names of all options.
   static List<String> get allowedValues =>
       [for (Verbosity value in values) value.name];
 
+  // Coverage-ignore(suite): Not run.
   /// Returns a map from option name to option help messages.
   static Map<String, String> get allowedValuesHelp =>
       {for (Verbosity value in values) value.name: value.help};
@@ -576,6 +586,7 @@
         return verbosity;
       }
     }
+    // Coverage-ignore-block(suite): Not run.
     String message = "Unknown verbosity '$name'.";
     if (onError != null) {
       onError(message);
@@ -584,6 +595,7 @@
     throw new UnsupportedError(message);
   }
 
+  // Coverage-ignore(suite): Not run.
   static bool shouldPrint(Verbosity verbosity, DiagnosticMessage message) {
     Severity severity = message.severity;
     switch (verbosity) {
@@ -638,6 +650,7 @@
   String toString() => 'Verbosity($name)';
 }
 
+// Coverage-ignore(suite): Not run.
 /// Interface for hooking into the compilation pipeline for testing.
 class HooksForTesting {
   /// Called before the intermediate macro augmentation libraries have been
diff --git a/pkg/front_end/lib/src/api_prototype/experimental_flags.dart b/pkg/front_end/lib/src/api_prototype/experimental_flags.dart
index 69b8478..62728dd 100644
--- a/pkg/front_end/lib/src/api_prototype/experimental_flags.dart
+++ b/pkg/front_end/lib/src/api_prototype/experimental_flags.dart
@@ -58,6 +58,7 @@
     enabled = explicitExperimentalFlags[flag];
   }
   if (defaultExperimentFlagsForTesting != null) {
+    // Coverage-ignore-block(suite): Not run.
     enabled ??= defaultExperimentFlagsForTesting[flag];
   }
   enabled ??= flag.isEnabledByDefault;
@@ -86,6 +87,7 @@
     enabled = explicitExperimentalFlags[flag];
   }
   if (defaultExperimentFlagsForTesting != null) {
+    // Coverage-ignore-block(suite): Not run.
     enabled ??= defaultExperimentFlagsForTesting[flag];
   }
   enabled ??= flag.isEnabledByDefault;
@@ -137,6 +139,7 @@
   Version? version;
   bool? enabledByDefault;
   if (defaultExperimentFlagsForTesting != null) {
+    // Coverage-ignore-block(suite): Not run.
     enabledByDefault = defaultExperimentFlagsForTesting[flag];
   }
   enabledByDefault ??= flag.isEnabledByDefault;
@@ -149,6 +152,7 @@
     // If the feature is not enabled by default or is enabled by the allowed
     // list use the experiment release version.
     if (experimentReleasedVersionForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       version = experimentReleasedVersionForTesting[flag];
     }
     version ??= flag.experimentReleasedVersion;
@@ -156,6 +160,7 @@
     // If the feature is enabled by default and is not enabled by the allowed
     // list use the enabled version.
     if (experimentEnabledVersionForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       version = experimentEnabledVersionForTesting[flag];
     }
     version ??= flag.experimentEnabledVersion;
@@ -172,6 +177,7 @@
     Map<ExperimentalFlag, Version>? experimentReleasedVersionForTesting}) {
   bool? enabledByDefault;
   if (defaultExperimentFlagsForTesting != null) {
+    // Coverage-ignore-block(suite): Not run.
     enabledByDefault = defaultExperimentFlagsForTesting[flag];
   }
   enabledByDefault ??= flag.isEnabledByDefault;
@@ -205,6 +211,7 @@
       // If the feature is not enabled by default or is enabled by the allowed
       // list, use the experiment release version.
       if (experimentReleasedVersionForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         enabledVersion = experimentReleasedVersionForTesting[flag]!;
       }
       enabledVersion ??= flag.experimentReleasedVersion;
@@ -212,6 +219,7 @@
       // If the feature is enabled by default and is not enabled by the allowed
       // list use the enabled version.
       if (experimentEnabledVersionForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         enabledVersion = experimentEnabledVersionForTesting[flag];
       }
       enabledVersion ??= flag.experimentEnabledVersion;
diff --git a/pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart b/pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart
index b2c46c5..12871ff 100644
--- a/pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart
+++ b/pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart
@@ -17,6 +17,7 @@
 
 export '../base/incremental_serializer.dart' show IncrementalSerializer;
 
+// Coverage-ignore(suite): Not run.
 abstract class IncrementalKernelGenerator {
   factory IncrementalKernelGenerator(
       CompilerOptions options, List<Uri> entryPoints,
@@ -138,6 +139,7 @@
   void setExperimentalFeaturesForTesting(Set<String> features);
 }
 
+// Coverage-ignore(suite): Not run.
 bool isLegalIdentifier(String identifier) {
   return StringScanner.isLegalIdentifier(identifier);
 }
diff --git a/pkg/front_end/lib/src/api_prototype/kernel_generator.dart b/pkg/front_end/lib/src/api_prototype/kernel_generator.dart
index 9c04367..64c3e8e 100644
--- a/pkg/front_end/lib/src/api_prototype/kernel_generator.dart
+++ b/pkg/front_end/lib/src/api_prototype/kernel_generator.dart
@@ -18,6 +18,7 @@
     show generateKernel, generateKernelInternal;
 import 'compiler_options.dart' show CompilerOptions;
 
+// Coverage-ignore(suite): Not run.
 /// Generates a kernel representation of the program whose main library is in
 /// the given [source].
 ///
@@ -44,6 +45,7 @@
       additionalSources: additionalSources));
 }
 
+// Coverage-ignore(suite): Not run.
 Future<CompilerResult?> kernelForProgramInternal(
   Uri source,
   CompilerOptions options, {
@@ -74,6 +76,7 @@
   });
 }
 
+// Coverage-ignore(suite): Not run.
 /// Generates a kernel representation for a module containing [sources].
 ///
 /// A module is a collection of libraries that are compiled together. Libraries
diff --git a/pkg/front_end/lib/src/api_prototype/language_version.dart b/pkg/front_end/lib/src/api_prototype/language_version.dart
index 7d5cbd16..b5c73ad 100644
--- a/pkg/front_end/lib/src/api_prototype/language_version.dart
+++ b/pkg/front_end/lib/src/api_prototype/language_version.dart
@@ -19,6 +19,7 @@
 
 export 'package:kernel/ast.dart' show Version;
 
+// Coverage-ignore(suite): Not run.
 /// Gets the language version for a specific URI.
 ///
 /// Note that this returning some language version, doesn't mean there aren't
@@ -128,6 +129,7 @@
   });
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if the language version of [uri] does not support null
 /// safety.
 Future<bool> uriUsesLegacyLanguageVersion(
@@ -142,6 +144,7 @@
       versionAndLibraryUri.version);
 }
 
+// Coverage-ignore(suite): Not run.
 class VersionAndPackageUri {
   final Version version;
   final Uri packageUri;
diff --git a/pkg/front_end/lib/src/api_prototype/lowering_predicates.dart b/pkg/front_end/lib/src/api_prototype/lowering_predicates.dart
index ee9e55b..a359853 100644
--- a/pkg/front_end/lib/src/api_prototype/lowering_predicates.dart
+++ b/pkg/front_end/lib/src/api_prototype/lowering_predicates.dart
@@ -13,6 +13,7 @@
         isTearOffLowering,
         isTypedefTearOffLowering;
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is the field holding the value of a lowered late
 /// field.
 ///
@@ -37,6 +38,7 @@
       !node.name.text.endsWith(lateIsSetSuffix);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original field for a lowered late field where
 /// [node] is the field holding the value of a lowered late field.
 ///
@@ -65,6 +67,7 @@
   return new Name(node.name.text.substring(prefix.length), node.name.library);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is the field holding the marker for whether a
 /// lowered late field has been set or not.
 ///
@@ -91,6 +94,7 @@
       node.name.text.endsWith(lateIsSetSuffix);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original field for a lowered late field where [node]
 /// is the field holding the marker for whether the lowered late field has been
 /// set or not.
@@ -125,6 +129,7 @@
       node.name.library);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is the getter for reading the value of a lowered
 /// late field.
 ///
@@ -160,6 +165,7 @@
   return false;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original field for a lowered late field where [node]
 /// is the getter for reading the value of a lowered late field.
 ///
@@ -184,6 +190,7 @@
   return node.name;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is the setter for setting the value of a lowered
 /// late field.
 ///
@@ -219,6 +226,7 @@
   return false;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original field for a lowered late field where [node]
 /// is the setter for setting the value of a lowered late field.
 ///
@@ -243,6 +251,7 @@
   return node.name;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the original initializer of a lowered late field where [node] is
 /// either the field holding the value, the field holding the marker for whether
 /// it has been set or not, getter for reading the value, or the setter for
@@ -394,6 +403,7 @@
   return null;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns getter for reading the value of a lowered late field where [node] is
 /// either the field holding the value, the field holding the marker for whether
 /// it has been set or not, getter for reading the value, or the setter for
@@ -428,6 +438,7 @@
   return null;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the field holding the value for a lowered late field where [node] is
 /// either the field holding the value, the field holding the marker for whether
 /// it has been set or not, getter for reading the value, or the setter for
@@ -481,6 +492,7 @@
   return null;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is the local variable holding the value of a
 /// lowered late variable.
 ///
@@ -503,6 +515,7 @@
   return node.isLowered && isLateLoweredLocalName(node.name!);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [name] is the name of a local variable holding the value
 /// of a lowered late variable.
 bool isLateLoweredLocalName(String name) {
@@ -514,6 +527,7 @@
       !name.contains(joinedIntermediateInfix);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original late local variable from the [name] of the
 /// local variable holding the value of the lowered late variable.
 ///
@@ -522,6 +536,7 @@
   return name.substring(lateLocalPrefix.length);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is the local variable holding the marker for
 /// whether a lowered late local variable has been set or not.
 ///
@@ -546,12 +561,14 @@
   return node.isLowered && isLateLoweredIsSetLocalName(node.name!);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [name] is the name of a local variable holding the marker
 /// for whether a lowered late local variable has been set or not.
 bool isLateLoweredIsSetLocalName(String name) {
   return name.startsWith(lateLocalPrefix) && name.endsWith(lateIsSetSuffix);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original late local variable from the [name] of the
 /// local variable holding the marker for whether the lowered late local
 /// variable has been set or not.
@@ -562,6 +579,7 @@
       lateLocalPrefix.length, name.length - lateIsSetSuffix.length);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is the local variable for the local function for
 /// reading the value of a lowered late variable.
 ///
@@ -582,6 +600,7 @@
   return node.isLowered && isLateLoweredLocalGetterName(node.name!);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [name] is the name of the local variable for the local
 /// function for reading the value of a lowered late variable.
 bool isLateLoweredLocalGetterName(String name) {
@@ -589,6 +608,7 @@
       name.endsWith(lateLocalGetterSuffix);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original late local variable from the [name] of the
 /// local variable for the local function for reading the value of the lowered
 /// late variable.
@@ -599,6 +619,7 @@
       lateLocalPrefix.length, name.length - lateLocalGetterSuffix.length);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is the local variable for the local function for
 /// setting the value of a lowered late variable.
 ///
@@ -620,6 +641,7 @@
   return node.isLowered && isLateLoweredLocalSetterName(node.name!);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [name] is the name of the local variable for the local
 /// function for setting the value of a lowered late variable.
 bool isLateLoweredLocalSetterName(String name) {
@@ -627,6 +649,7 @@
       name.endsWith(lateLocalSetterSuffix);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original late local variable from the [name] of the
 /// local variable for the local function for setting the value of the lowered
 /// late variable.
@@ -652,7 +675,9 @@
 ///
 /// where '#this' is the synthetic "extension this" parameter.
 bool isExtensionThis(VariableDeclaration node) {
-  assert(node.isLowered || node.name == null || !isExtensionThisName(node.name),
+  assert(
+      node.isLowered || node.name == null || !isExtensionThisName(node.name),
+      // Coverage-ignore(suite): Not run.
       "$node has name ${node.name} and node.isLowered = ${node.isLowered}");
   return node.isLowered && isExtensionThisName(node.name);
 }
@@ -667,12 +692,14 @@
   return name == syntheticThisName;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Return `true` if [node] is the synthetic parameter holding the `this` value
 /// in the encoding of extension type instance members and constructors.
 bool isExtensionTypeThis(VariableDeclaration node) {
   return node.isLowered && isExtensionTypeThisName(node.name);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [name] is the name of the synthetic parameter holding the
 /// `this` value in the encoding of extension type instance members and
 /// constructors.
@@ -680,6 +707,7 @@
   return name == syntheticThisName;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the name of the original variable from the [name] of the synthetic
 /// parameter holding the `this` value in the encoding of extension instance
 /// members.
@@ -689,6 +717,7 @@
   return 'this';
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the original name of the variable [node].
 ///
 /// If [node] is a lowered variable then the name before lowering is returned.
@@ -707,6 +736,7 @@
   return node.name;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the original name of a variable by the given [name].
 ///
 /// If [name] is the name of a lowered variable then the name before lowering is
@@ -717,6 +747,7 @@
   return _extractLocalName(name) ?? name;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the original name of a lowered variable by the given [name].
 ///
 /// If [name] doesn't correspond to a lowered name `null` is returned.
@@ -742,6 +773,7 @@
 /// See [isJoinedIntermediateName] for details.
 const String joinedIntermediateInfix = "#case#";
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [node] is a joined intermediate variable.
 ///
 /// See [isJoinedIntermediateName] for details.
@@ -751,6 +783,7 @@
       isJoinedIntermediateName(node.name!);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [name] is the name of the "joined intermediate" variable
 /// for a "joined local variable".
 ///
@@ -794,6 +827,7 @@
       null;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns the original name for a joined intermediate variable from the [name]
 /// of the lowered variable.
 ///
@@ -812,6 +846,7 @@
   return '$variableName$joinedIntermediateInfix$index';
 }
 
+// Coverage-ignore(suite): Not run.
 /// This turns Foo|bar into Foo.bar.
 ///
 /// This only works for normal methods and operators, but for getters and
diff --git a/pkg/front_end/lib/src/api_prototype/memory_file_system.dart b/pkg/front_end/lib/src/api_prototype/memory_file_system.dart
index 8034c14..0101274 100644
--- a/pkg/front_end/lib/src/api_prototype/memory_file_system.dart
+++ b/pkg/front_end/lib/src/api_prototype/memory_file_system.dart
@@ -44,6 +44,7 @@
 
   static Uri _addTrailingSlash(Uri uri) {
     if (!uri.path.endsWith('/')) {
+      // Coverage-ignore-block(suite): Not run.
       uri = uri.replace(path: uri.path + '/');
     }
     return uri;
@@ -69,6 +70,7 @@
       other.uri == uri &&
       identical(other._fileSystem, _fileSystem);
 
+  // Coverage-ignore(suite): Not run.
   /// Create a directory for this file system entry.
   ///
   /// If the entry is an existing file, this is an error.
@@ -86,9 +88,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<bool> existsAsyncIfPossible() => exists();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<List<int>> readAsBytes() {
     Uint8List? contents = _fileSystem._files[uri];
     if (contents == null) {
@@ -100,9 +104,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<List<int>> readAsBytesAsyncIfPossible() => readAsBytes();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<String> readAsString() async {
     List<int> bytes = await readAsBytes();
     try {
@@ -112,6 +118,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Writes the given raw bytes to this file system entity.
   ///
   /// If no file exists, one is created.  If a file exists already, it is
@@ -124,6 +131,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Writes the given string to this file system entity.
   ///
   /// The string is encoded as UTF-8.
@@ -134,6 +142,7 @@
     _update(uri, utf8.encode(s));
   }
 
+  // Coverage-ignore(suite): Not run.
   void _update(Uri uri, Uint8List data) {
     if (_fileSystem._directories.contains(uri)) {
       throw new FileSystemException(uri, 'Entry $uri is a directory.');
diff --git a/pkg/front_end/lib/src/api_prototype/standard_file_system.dart b/pkg/front_end/lib/src/api_prototype/standard_file_system.dart
index bf1bcff..39a9a14 100644
--- a/pkg/front_end/lib/src/api_prototype/standard_file_system.dart
+++ b/pkg/front_end/lib/src/api_prototype/standard_file_system.dart
@@ -24,7 +24,9 @@
   FileSystemEntity entityForUri(Uri uri) {
     if (uri.isScheme('file')) {
       return new _IoFileSystemEntity(uri);
-    } else if (!uri.hasScheme) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (!uri.hasScheme) {
       // TODO(askesc): Empty schemes should have been handled elsewhere.
       return new _IoFileSystemEntity(Uri.base.resolveUri(uri));
     } else if (uri.isScheme('data')) {
@@ -56,6 +58,7 @@
       return new Future.value(true);
     }
     if (io.FileSystemEntity.isDirectorySync(uri.toFilePath())) {
+      // Coverage-ignore-block(suite): Not run.
       return new Future.value(true);
     }
     // TODO(CFE-team): What about [Link]s?
@@ -63,6 +66,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<bool> existsAsyncIfPossible() async {
     if (await new io.File.fromUri(uri).exists()) {
       return true;
@@ -86,6 +90,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<List<int>> readAsBytesAsyncIfPossible() async {
     try {
       CompilerContext.recordDependency(uri);
@@ -100,7 +105,9 @@
     try {
       CompilerContext.recordDependency(uri);
       return await new io.File.fromUri(uri).readAsString();
-    } on io.FileSystemException catch (exception) {
+    }
+    // Coverage-ignore(suite): Not run.
+    on io.FileSystemException catch (exception) {
       throw _toFileSystemException(exception);
     }
   }
@@ -118,6 +125,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Concrete implementation of [FileSystemEntity] for data: URIs.
 class DataFileSystemEntity implements FileSystemEntity {
   @override
diff --git a/pkg/front_end/lib/src/api_prototype/summary_generator.dart b/pkg/front_end/lib/src/api_prototype/summary_generator.dart
index 2d37517..9554020 100644
--- a/pkg/front_end/lib/src/api_prototype/summary_generator.dart
+++ b/pkg/front_end/lib/src/api_prototype/summary_generator.dart
@@ -9,6 +9,7 @@
 import '../kernel_generator_impl.dart';
 import 'compiler_options.dart';
 
+// Coverage-ignore(suite): Not run.
 /// Creates a summary representation of the build unit whose source files are in
 /// [sources].
 ///
diff --git a/pkg/front_end/lib/src/api_prototype/terminal_color_support.dart b/pkg/front_end/lib/src/api_prototype/terminal_color_support.dart
index e60cfab..32ba567 100644
--- a/pkg/front_end/lib/src/api_prototype/terminal_color_support.dart
+++ b/pkg/front_end/lib/src/api_prototype/terminal_color_support.dart
@@ -10,6 +10,7 @@
 
 export 'package:_fe_analyzer_shared/src/util/colors.dart' show enableColors;
 
+// Coverage-ignore(suite): Not run.
 void printDiagnosticMessage(
     DiagnosticMessage message, void Function(String) println) {
   if (enableColors) {
diff --git a/pkg/front_end/lib/src/api_unstable/compiler_state.dart b/pkg/front_end/lib/src/api_unstable/compiler_state.dart
index 70bff8b..7fa949c 100644
--- a/pkg/front_end/lib/src/api_unstable/compiler_state.dart
+++ b/pkg/front_end/lib/src/api_unstable/compiler_state.dart
@@ -8,6 +8,7 @@
 import '../base/incremental_compiler.dart' show IncrementalCompiler;
 import '../base/processed_options.dart' show ProcessedOptions;
 
+// Coverage-ignore(suite): Not run.
 class InitializedCompilerState {
   final CompilerOptions options;
   final ProcessedOptions processedOpts;
@@ -28,6 +29,7 @@
       this.libraryToInputDill});
 }
 
+// Coverage-ignore(suite): Not run.
 /// A cached [Component] for a summary input file.
 ///
 /// Tracks the originally marked "external" libs so that they can be restored,
@@ -38,6 +40,7 @@
   WorkerInputComponent(this.digest, this.component);
 }
 
+// Coverage-ignore(suite): Not run.
 bool digestsEqual(List<int>? a, List<int>? b) {
   if (a == null || b == null) return false;
   if (a.length != b.length) return false;
diff --git a/pkg/front_end/lib/src/api_unstable/dart2js.dart b/pkg/front_end/lib/src/api_unstable/dart2js.dart
index 7ae6f17..6362612 100644
--- a/pkg/front_end/lib/src/api_unstable/dart2js.dart
+++ b/pkg/front_end/lib/src/api_unstable/dart2js.dart
@@ -91,6 +91,7 @@
     show computePlatformBinariesLocation;
 export 'compiler_state.dart' show InitializedCompilerState;
 
+// Coverage-ignore(suite): Not run.
 InitializedCompilerState initializeCompiler(
     InitializedCompilerState? oldState,
     Target target,
@@ -140,6 +141,7 @@
   return new InitializedCompilerState(options, processedOpts);
 }
 
+// Coverage-ignore(suite): Not run.
 Future<Component?> compile(
     InitializedCompilerState state,
     bool verbose,
diff --git a/pkg/front_end/lib/src/api_unstable/util.dart b/pkg/front_end/lib/src/api_unstable/util.dart
index 2200eff..af3cd9f 100644
--- a/pkg/front_end/lib/src/api_unstable/util.dart
+++ b/pkg/front_end/lib/src/api_unstable/util.dart
@@ -12,6 +12,7 @@
   return true;
 }
 
+// Coverage-ignore(suite): Not run.
 bool equalSets<K>(Set<K>? a, Set<K>? b) {
   if (identical(a, b)) return true;
   if (a == null || b == null) return false;
@@ -22,6 +23,7 @@
   return true;
 }
 
+// Coverage-ignore(suite): Not run.
 bool equalMaps<K, V>(Map<K, V>? a, Map<K, V>? b) {
   if (identical(a, b)) return true;
   if (a == null || b == null) return false;
diff --git a/pkg/front_end/lib/src/base/builder_graph.dart b/pkg/front_end/lib/src/base/builder_graph.dart
index c99d307..b4754b3 100644
--- a/pkg/front_end/lib/src/base/builder_graph.dart
+++ b/pkg/front_end/lib/src/base/builder_graph.dart
@@ -20,6 +20,7 @@
     List<Uri> neighbors = [];
     LibraryBuilder? libraryBuilder = libraryBuilders[vertex];
     if (libraryBuilder == null) {
+      // Coverage-ignore-block(suite): Not run.
       throw "Library not found: $vertex";
     }
     for (Uri importUri in libraryBuilder.dependencies) {
diff --git a/pkg/front_end/lib/src/base/command_line_reporting.dart b/pkg/front_end/lib/src/base/command_line_reporting.dart
index 0aead52..89c0127 100644
--- a/pkg/front_end/lib/src/base/command_line_reporting.dart
+++ b/pkg/front_end/lib/src/base/command_line_reporting.dart
@@ -44,7 +44,9 @@
     }
     String? prefix = severityPrefixes[severity];
     String messageTextTmp = prefix == null
-        ? message.problemMessage
+        ?
+        // Coverage-ignore(suite): Not run.
+        message.problemMessage
         : "$prefix: ${message.problemMessage}";
     if (message.correctionMessage != null) {
       messageTextTmp += "\n${message.correctionMessage}";
@@ -58,6 +60,7 @@
         break;
 
       case Severity.warning:
+        // Coverage-ignore(suite): Not run.
         messageTextColorized = magenta(messageTextPlain);
         break;
 
@@ -65,10 +68,12 @@
         messageTextColorized = green(messageTextPlain);
         break;
 
+      // Coverage-ignore(suite): Not run.
       case Severity.info:
         messageTextColorized = yellow(messageTextPlain);
         break;
 
+      // Coverage-ignore(suite): Not run.
       case Severity.ignored:
         return unhandled("$severity", "format", -1, null);
     }
@@ -95,6 +100,7 @@
       );
     }
   } catch (error, trace) {
+    // Coverage-ignore-block(suite): Not run.
     print("Crash when formatting: "
         "[${message.code.name}] ${safeToString(message.problemMessage)}\n"
         "${safeToString(error)}\n"
@@ -119,6 +125,7 @@
     int lengthInSourceLine = min(indentation.length, sourceLine.length);
     for (int i = 0; i < lengthInSourceLine; i++) {
       if (sourceLine.codeUnitAt(i) == $TAB) {
+        // Coverage-ignore-block(suite): Not run.
         indentation[i] = $TAB;
       }
     }
@@ -145,13 +152,18 @@
 bool isHidden(Severity severity) {
   switch (severity) {
     case Severity.error:
+    // Coverage-ignore(suite): Not run.
     case Severity.internalProblem:
+    // Coverage-ignore(suite): Not run.
     case Severity.context:
+    // Coverage-ignore(suite): Not run.
     case Severity.info:
       return false;
 
+    // Coverage-ignore(suite): Not run.
     case Severity.warning:
       return hideWarnings;
+    // Coverage-ignore(suite): Not run.
     case Severity.ignored:
       return true;
   }
@@ -164,12 +176,15 @@
     case Severity.error:
       return CompilerContext.current.options.throwOnErrorsForDebugging;
 
+    // Coverage-ignore(suite): Not run.
     case Severity.internalProblem:
       return true;
 
+    // Coverage-ignore(suite): Not run.
     case Severity.warning:
       return CompilerContext.current.options.throwOnWarningsForDebugging;
 
+    // Coverage-ignore(suite): Not run.
     case Severity.info:
     case Severity.ignored:
     case Severity.context:
diff --git a/pkg/front_end/lib/src/base/compiler_context.dart b/pkg/front_end/lib/src/base/compiler_context.dart
index 21a946d..0897a08 100644
--- a/pkg/front_end/lib/src/base/compiler_context.dart
+++ b/pkg/front_end/lib/src/base/compiler_context.dart
@@ -72,7 +72,9 @@
   }
 
   static void recordDependency(Uri uri) {
-    if (!uri.isScheme("file") && !uri.isScheme("http")) {
+    if (!uri.isScheme("file") &&
+        // Coverage-ignore(suite): Not run.
+        !uri.isScheme("http")) {
       throw new ArgumentError("Expected a file or http URI, but got: '$uri'.");
     }
     CompilerContext? context = Zone.current[compilerContextKey];
@@ -84,6 +86,7 @@
   static CompilerContext get current {
     CompilerContext? context = Zone.current[compilerContextKey];
     if (context == null) {
+      // Coverage-ignore-block(suite): Not run.
       // Note: we throw directly and don't use internalProblem, because
       // internalProblem depends on having a compiler context available.
       String problemMessage =
diff --git a/pkg/front_end/lib/src/base/crash.dart b/pkg/front_end/lib/src/base/crash.dart
index 700a143..50a70dd5 100644
--- a/pkg/front_end/lib/src/base/crash.dart
+++ b/pkg/front_end/lib/src/base/crash.dart
@@ -61,6 +61,7 @@
 
 Future<T> reportCrash<T>(error, StackTrace trace,
     [Uri? uri, int? charOffset]) async {
+  // Coverage-ignore(suite): Not run.
   Future<void> note(String note) async {
     stderr.write(note);
     await stderr.flush();
@@ -68,6 +69,7 @@
 
   if (hasCrashed) return new Future<T>.error(error, trace);
   if (error is Crash) {
+    // Coverage-ignore-block(suite): Not run.
     trace = error.trace ?? trace;
     uri = error.uri ?? uri;
     charOffset = error.charOffset ?? charOffset;
@@ -97,6 +99,7 @@
           new Crash(uri, charOffset, error, trace).._hasBeenReported = true,
           trace);
     }
+    // Coverage-ignore-block(suite): Not run.
     await note("\nSending crash report data");
     request.persistentConnection = false;
     request.bufferOutput = false;
@@ -109,9 +112,11 @@
     await request.close();
     await note(".");
   } catch (e, s) {
+    // Coverage-ignore-block(suite): Not run.
     await note("\n${safeToString(e)}\n$s\n");
     await note("\n\n\nFE::ERROR::$json\n\n\n");
   }
+  // Coverage-ignore-block(suite): Not run.
   client.close(force: true);
   await note("\n");
   return new Future<T>.error(error, trace);
@@ -121,6 +126,7 @@
   try {
     return "$object";
   } catch (e) {
+    // Coverage-ignore-block(suite): Not run.
     return "Error when converting ${object.runtimeType} to string.";
   }
 }
diff --git a/pkg/front_end/lib/src/base/export.dart b/pkg/front_end/lib/src/base/export.dart
index 5d2076a..e16ec9c 100644
--- a/pkg/front_end/lib/src/base/export.dart
+++ b/pkg/front_end/lib/src/base/export.dart
@@ -36,7 +36,9 @@
     if (combinators != null) {
       for (CombinatorBuilder combinator in combinators!) {
         if (combinator.isShow && !combinator.names.contains(name)) return false;
-        if (combinator.isHide && combinator.names.contains(name)) return false;
+        if (combinator.isHide &&
+            // Coverage-ignore(suite): Not run.
+            combinator.names.contains(name)) return false;
       }
     }
     return exporter.addToExportScope(name, member, charOffset);
diff --git a/pkg/front_end/lib/src/base/hybrid_file_system.dart b/pkg/front_end/lib/src/base/hybrid_file_system.dart
index 61ccabb..07e33b2 100644
--- a/pkg/front_end/lib/src/base/hybrid_file_system.dart
+++ b/pkg/front_end/lib/src/base/hybrid_file_system.dart
@@ -17,7 +17,8 @@
   final FileSystem physical;
 
   HybridFileSystem(this.memory, [FileSystem? _physical])
-      : physical = _physical ?? StandardFileSystem.instance;
+      : physical = _physical ?? // Coverage-ignore(suite): Not run.
+            StandardFileSystem.instance;
 
   @override
   FileSystemEntity entityForUri(Uri uri) =>
@@ -36,12 +37,17 @@
 
   Future<FileSystemEntity> get delegate async {
     if (_delegate != null) {
+      // Coverage-ignore-block(suite): Not run.
       return _delegate!;
     }
     FileSystemEntity entity = _fs.memory.entityForUri(uri);
-    if (((!uri.isScheme('file') && !uri.isScheme('data')) &&
+    if (((!uri.isScheme('file') &&
+                // Coverage-ignore(suite): Not run.
+                !uri.isScheme('data')) &&
+            // Coverage-ignore(suite): Not run.
             _fs.physical is StandardFileSystem) ||
         await entity.exists()) {
+      // Coverage-ignore-block(suite): Not run.
       _delegate = entity;
       return _delegate!;
     }
@@ -49,9 +55,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<bool> exists() async => (await delegate).exists();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<bool> existsAsyncIfPossible() async =>
       (await delegate).existsAsyncIfPossible();
 
@@ -59,9 +67,11 @@
   Future<List<int>> readAsBytes() async => (await delegate).readAsBytes();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<List<int>> readAsBytesAsyncIfPossible() async =>
       (await delegate).readAsBytesAsyncIfPossible();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<String> readAsString() async => (await delegate).readAsString();
 }
diff --git a/pkg/front_end/lib/src/base/identifiers.dart b/pkg/front_end/lib/src/base/identifiers.dart
index ea310eb..265ad03 100644
--- a/pkg/front_end/lib/src/base/identifiers.dart
+++ b/pkg/front_end/lib/src/base/identifiers.dart
@@ -87,9 +87,11 @@
   @override
   String get name => operator.text;
 
+  // Coverage-ignore(suite): Not run.
   int get charOffset => token.charOffset;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get firstOffset => token.charOffset;
 
   @override
@@ -99,14 +101,17 @@
   int get nameOffset => token.charOffset;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression? get initializer => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   QualifiedName withQualifier(Object qualifier) {
     return unsupported("withQualifier", charOffset, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeName get typeName {
     return unsupported("typeName", charOffset, null);
   }
@@ -123,11 +128,13 @@
       : super(identifier.token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   QualifiedName withQualifier(Object qualifier) {
     return unsupported("withQualifier", charOffset, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeName get typeName {
     return unsupported("typeName", charOffset, null);
   }
@@ -154,6 +161,7 @@
   int get nameOffset => token.charOffset;
 
   @override
+  // Coverage-ignore(suite): Not run.
   QualifiedName withQualifier(Object qualifier) {
     return unsupported("withQualifier", charOffset, null);
   }
@@ -173,7 +181,9 @@
     flattenQualifiedNameOn(qualifier, buffer, charOffset, fileUri);
   } else if (qualifier is Identifier) {
     buffer.write(qualifier.name);
-  } else if (qualifier is String) {
+  }
+  // Coverage-ignore(suite): Not run.
+  else if (qualifier is String) {
     buffer.write(qualifier);
   } else {
     unhandled("${qualifier.runtimeType}", "flattenQualifiedNameOn", charOffset,
diff --git a/pkg/front_end/lib/src/base/import_chains.dart b/pkg/front_end/lib/src/base/import_chains.dart
index 04158a8..af09cc8 100644
--- a/pkg/front_end/lib/src/base/import_chains.dart
+++ b/pkg/front_end/lib/src/base/import_chains.dart
@@ -63,6 +63,7 @@
 
     if (!importChains.contains(importChain)) {
       if (importChains.length > compactChainLimit) {
+        // Coverage-ignore-block(suite): Not run.
         importChains.add('...');
         return false;
       } else {
@@ -72,6 +73,7 @@
 
     chainCount++;
     if (chainCount > chainLimit) {
+      // Coverage-ignore-block(suite): Not run.
       // Assume there are more import chains.
       importChains.add('...');
       return false;
@@ -207,6 +209,7 @@
         String packageName = uri.path.substring(0, slashPos);
         return new PackageLocation(packageName);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         // This is an invalid import uri, like "package:foo.dart".
         return new UriLocation(uri);
       }
diff --git a/pkg/front_end/lib/src/base/incremental_compiler.dart b/pkg/front_end/lib/src/base/incremental_compiler.dart
index 357c8d1..da086d4 100644
--- a/pkg/front_end/lib/src/base/incremental_compiler.dart
+++ b/pkg/front_end/lib/src/base/incremental_compiler.dart
@@ -119,8 +119,10 @@
 
   DillTarget? _dillLoadedData;
   List<DillLibraryBuilder>? _platformBuilders;
+  // Coverage-ignore(suite): Not run.
   List<DillLibraryBuilder>? get platformBuildersForTesting => _platformBuilders;
   Map<Uri, DillLibraryBuilder>? _userBuilders;
+  // Coverage-ignore(suite): Not run.
   Map<Uri, DillLibraryBuilder>? get userBuildersForTesting => _userBuilders;
 
   final _InitializationStrategy _initializationStrategy;
@@ -170,6 +172,7 @@
     _enableExperimentsBasedOnEnvironment();
   }
 
+  // Coverage-ignore(suite): Not run.
   IncrementalCompiler(this.context,
       [Uri? _initializeFromDillUri,
       bool? outlineOnly,
@@ -184,6 +187,7 @@
     _enableExperimentsBasedOnEnvironment();
   }
 
+  // Coverage-ignore(suite): Not run.
   IncrementalCompiler.forExpressionCompilationOnly(
       this.context, Component? _componentToInitializeFrom,
       [bool? resetTicker])
@@ -198,23 +202,29 @@
     _enableExperimentsBasedOnEnvironment();
   }
 
+  // Coverage-ignore(suite): Not run.
   bool get initializedFromDillForTesting =>
       _initializationStrategy.initializedFromDillForTesting;
 
+  // Coverage-ignore(suite): Not run.
   bool get initializedIncrementalSerializerForTesting =>
       _initializationStrategy.initializedIncrementalSerializerForTesting;
 
+  // Coverage-ignore(suite): Not run.
   DillTarget? get dillTargetForTesting => _dillLoadedData;
 
   IncrementalKernelTarget? get kernelTargetForTesting => _lastGoodKernelTarget;
 
+  // Coverage-ignore(suite): Not run.
   bool get skipExperimentalInvalidationChecksForTesting => false;
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the [Package] used for the package [packageName] in the most
   /// recent compilation.
   Package? getPackageForPackageName(String packageName) =>
       _currentPackagesMap?[packageName];
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the [Library] with the given [importUri] from the most recent
   /// compilation.
   Library? lookupLibrary(Uri importUri) => _lastGoodKernelTarget?.loader
@@ -225,11 +235,13 @@
     // Note that these are all experimental. Use at your own risk.
     enabledExperiments ??= getExperimentEnvironment();
     if (enabledExperiments.contains(enableIncrementalCompilerBenchmarking)) {
+      // Coverage-ignore-block(suite): Not run.
       _benchmarker = new Benchmarker();
     }
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void setExperimentalFeaturesForTesting(Set<String> features) {
     _enableExperimentsBasedOnEnvironment(enabledExperiments: features);
   }
@@ -240,6 +252,7 @@
       bool fullComponent = false,
       bool trackNeededDillLibraries = false}) async {
     while (_currentlyCompiling != null) {
+      // Coverage-ignore-block(suite): Not run.
       await _currentlyCompiling!.future;
     }
     _currentlyCompiling = new Completer();
@@ -261,17 +274,25 @@
       }
       _computeDeltaRunOnce = true;
       IncrementalKernelTarget? lastGoodKernelTarget = _lastGoodKernelTarget;
-      _benchmarker?.reset();
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.reset();
 
       // Initial setup: Load platform, initialize from dill or component etc.
-      _benchmarker?.enterPhase(BenchmarkPhases.incremental_setupPackages);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.incremental_setupPackages);
       UriTranslator uriTranslator = await _setupPackagesAndUriTranslator(c);
-      _benchmarker?.enterPhase(BenchmarkPhases.incremental_ensurePlatform);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.incremental_ensurePlatform);
       IncrementalCompilerData data =
           await _ensurePlatformAndInitialize(uriTranslator, c);
 
       // Figure out what to keep and what to throw away.
-      _benchmarker?.enterPhase(BenchmarkPhases.incremental_invalidate);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.incremental_invalidate);
       Set<Uri?> invalidatedUris = this._invalidatedUris.toSet();
       _invalidateNotKeptUserBuilders(invalidatedUris);
       ReusageResult? reusedResult = _computeReusedLibraries(
@@ -279,6 +300,7 @@
 
       // Experimental invalidation initialization (e.g. figure out if we can).
       _benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.incremental_experimentalInvalidation);
       ExperimentalInvalidation? experimentalInvalidation =
           await _initializeExperimentalInvalidation(
@@ -287,17 +309,21 @@
           experimentalInvalidation?.missingSources.length ?? 0);
 
       _benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.incremental_rewriteEntryPointsIfPart);
       _rewriteEntryPointsIfPart(entryPoints, reusedResult);
 
       _benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.incremental_invalidatePrecompiledMacros);
       await _invalidatePrecompiledMacros(
           c.options, reusedResult.notReusedLibraries);
 
       // Cleanup: After (potentially) removing builders we have stuff to cleanup
       // to not leak, and we might need to re-create the dill target.
-      _benchmarker?.enterPhase(BenchmarkPhases.incremental_cleanup);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.incremental_cleanup);
       _cleanupRemovedBuilders(
           lastGoodKernelTarget, reusedResult, uriTranslator);
       _recreateDillTargetIfPackageWasUpdated(uriTranslator, c);
@@ -315,9 +341,11 @@
       // For modular compilation we can be asked to load components and track
       // which libraries we actually use for the compilation. Set that up now.
       _benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.incremental_loadEnsureLoadedComponents);
       _loadEnsureLoadedComponents(reusedLibraries);
       if (trackNeededDillLibraries) {
+        // Coverage-ignore-block(suite): Not run.
         _resetTrackingOfUsedLibraries(hierarchy);
       }
 
@@ -326,7 +354,9 @@
       // builders needs to be patched up.
       IncrementalKernelTarget currentKernelTarget;
       while (true) {
-        _benchmarker?.enterPhase(BenchmarkPhases.incremental_setupInLoop);
+        _benchmarker
+            // Coverage-ignore(suite): Not run.
+            ?.enterPhase(BenchmarkPhases.incremental_setupInLoop);
         currentKernelTarget = _setupNewKernelTarget(c, uriTranslator, hierarchy,
             reusedLibraries, experimentalInvalidation, entryPoints);
         Map<DillLibraryBuilder, List<CompilationUnit>>? rebuildBodiesMap =
@@ -337,20 +367,27 @@
         // TODO(johnniwinther,jensj): Ensure that the internal state of the
         // incremental compiler is consistent across 1 or more macro
         // precompilations.
-        _benchmarker?.enterPhase(BenchmarkPhases.incremental_precompileMacros);
+        _benchmarker
+            // Coverage-ignore(suite): Not run.
+            ?.enterPhase(BenchmarkPhases.incremental_precompileMacros);
         NeededPrecompilations? neededPrecompilations =
             await currentKernelTarget.computeNeededPrecompilations();
-        _benchmarker?.enterPhase(BenchmarkPhases.incremental_precompileMacros);
+        _benchmarker
+            // Coverage-ignore(suite): Not run.
+            ?.enterPhase(BenchmarkPhases.incremental_precompileMacros);
         if (context.options.globalFeatures.macros.isEnabled) {
           Map<Uri, macros.ExecutorFactoryToken>? precompiled =
               await precompileMacros(neededPrecompilations, c.options);
           if (precompiled != null) {
+            // Coverage-ignore-block(suite): Not run.
             macroExecutorFactoryTokens.addAll(precompiled);
             continue;
           }
         }
-        _benchmarker?.enterPhase(
-            BenchmarkPhases.incremental_experimentalInvalidationPatchUpScopes);
+        _benchmarker
+            // Coverage-ignore(suite): Not run.
+            ?.enterPhase(BenchmarkPhases
+                .incremental_experimentalInvalidationPatchUpScopes);
         _experimentalInvalidationPatchUpScopes(
             experimentalInvalidation, rebuildBodiesMap);
         rebuildBodiesMap = null;
@@ -374,15 +411,21 @@
             verify: c.options.verify);
         componentWithDill = buildResult.component;
       }
-      buildResult.macroApplications?.close();
+      buildResult.macroApplications
+          // Coverage-ignore(suite): Not run.
+          ?.close();
 
-      _benchmarker?.enterPhase(BenchmarkPhases.incremental_hierarchy);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.incremental_hierarchy);
       hierarchy ??= currentKernelTarget.loader.hierarchy;
       if (currentKernelTarget.classHierarchyChanges != null) {
+        // Coverage-ignore-block(suite): Not run.
         hierarchy.applyTreeChanges(
             [], [], currentKernelTarget.classHierarchyChanges!);
       }
       if (currentKernelTarget.classMemberChanges != null) {
+        // Coverage-ignore-block(suite): Not run.
         hierarchy.applyMemberChanges(currentKernelTarget.classMemberChanges!,
             findDescendants: true);
       }
@@ -390,6 +433,7 @@
 
       Set<Library>? neededDillLibraries;
       if (trackNeededDillLibraries) {
+        // Coverage-ignore-block(suite): Not run.
         _benchmarker
             ?.enterPhase(BenchmarkPhases.incremental_performDillUsageTracking);
         // Perform actual dill usage tracking.
@@ -403,6 +447,7 @@
       // assumed always to be non-null.
       if (componentWithDill != null) {
         _benchmarker
+            // Coverage-ignore(suite): Not run.
             ?.enterPhase(BenchmarkPhases.incremental_releaseAncillaryResources);
         this._invalidatedUris.clear();
         _hasToCheckPackageUris = false;
@@ -413,18 +458,23 @@
       // Compute which libraries to output and which (previous) errors/warnings
       // we have to reissue. In the process do some cleanup too.
       _benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.incremental_releaseAncillaryResources);
       List<Library> compiledLibraries =
           new List<Library>.of(currentKernelTarget.loader.libraries);
       Map<Uri, Source> uriToSource = componentWithDill!.uriToSource;
 
-      _benchmarker?.enterPhase(BenchmarkPhases
-          .incremental_experimentalCompilationPostCompilePatchup);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases
+              .incremental_experimentalCompilationPostCompilePatchup);
       _experimentalCompilationPostCompilePatchup(
           experimentalInvalidation, compiledLibraries, uriToSource);
 
-      _benchmarker?.enterPhase(BenchmarkPhases
-          .incremental_calculateOutputLibrariesAndIssueLibraryProblems);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases
+              .incremental_calculateOutputLibrariesAndIssueLibraryProblems);
 
       Set<LibraryBuilder> cleanedUpBuilders = {};
       List<Library> outputLibraries =
@@ -447,13 +497,16 @@
       // calculation has the potential to work.
       // ignore: unnecessary_null_comparison
       if (componentWithDill == null) {
+        // Coverage-ignore-block(suite): Not run.
         currentKernelTarget.loader.clearLibraryBuilders();
         currentKernelTarget = lastGoodKernelTarget!;
         _dillLoadedData!.loader.currentSourceLoader =
             currentKernelTarget.loader;
       } else {
-        _benchmarker?.enterPhase(
-            BenchmarkPhases.incremental_convertSourceLibraryBuildersToDill);
+        _benchmarker
+            // Coverage-ignore(suite): Not run.
+            ?.enterPhase(
+                BenchmarkPhases.incremental_convertSourceLibraryBuildersToDill);
         _previousSourceBuilders = _convertSourceLibraryBuildersToDill(
           currentKernelTarget,
           experimentalInvalidation,
@@ -461,17 +514,23 @@
         );
       }
 
-      _benchmarker?.enterPhase(BenchmarkPhases.incremental_end);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.incremental_end);
       experimentalInvalidation = null;
 
       // Output result.
       // ignore: unnecessary_null_comparison
       Procedure? mainMethod = componentWithDill == null
-          ? data.component?.mainMethod
+          ?
+          // Coverage-ignore(suite): Not run.
+          data.component?.mainMethod
           : componentWithDill.mainMethod;
       // ignore: unnecessary_null_comparison
       NonNullableByDefaultCompiledMode? compiledMode = componentWithDill == null
-          ? data.component?.mode
+          ?
+          // Coverage-ignore(suite): Not run.
+          data.component?.mode
           : componentWithDill.mode;
       Component result = context.options.target.configureComponent(
           new Component(libraries: outputLibraries, uriToSource: uriToSource))
@@ -485,9 +544,12 @@
 
       _lastGoodKernelTarget = currentKernelTarget;
 
-      _benchmarker?.stop();
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.stop();
 
       if (_benchmarker != null) {
+        // Coverage-ignore-block(suite): Not run.
         // Report.
         JsonEncoder encoder = new JsonEncoder.withIndent("  ");
         print(encoder.convert(_benchmarker));
@@ -596,6 +658,7 @@
     convertedLibraries = null;
     experimentalInvalidation = null;
     if (_userBuilders!.isEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       _userBuilders = null;
     }
     return newDillLibraryBuilders;
@@ -605,6 +668,7 @@
       SourceLoader sourceLoader, DillLoader dillLoader) {
     for (SourceLibraryBuilder sourceLibraryBuilder
         in sourceLoader.sourceLibraryBuilders) {
+      // Coverage-ignore-block(suite): Not run.
       Uri uri = sourceLibraryBuilder.importUri;
       DillLibraryBuilder dillLibraryBuilder =
           dillLoader.lookupLibraryBuilder(uri)!;
@@ -616,6 +680,7 @@
     return true;
   }
 
+  // Coverage-ignore(suite): Not run.
   String? _hasEquivalentScopes(SourceLibraryBuilder sourceLibraryBuilder,
       DillLibraryBuilder dillLibraryBuilder) {
     bool isEquivalent = true;
@@ -705,12 +770,14 @@
       );
       allLibraries = outputLibraries.toSet();
       if (!c.options.omitPlatform) {
+        // Coverage-ignore-block(suite): Not run.
         for (int i = 0; i < _platformBuilders!.length; i++) {
           Library lib = _platformBuilders![i].library;
           outputLibraries.add(lib);
         }
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       outputLibraries = <Library>[];
       allLibraries = _computeTransitiveClosure(
         currentKernelTarget,
@@ -751,6 +818,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Perform dill usage tracking if asked. Use the marking on dill builders as
   /// well as the class hierarchy to figure out which dill libraries was
   /// actually used by the compilation.
@@ -808,6 +876,7 @@
           }
           assert(
               !map.containsKey(name),
+              // Coverage-ignore(suite): Not run.
               "Unexpected double-entry for $name in "
               "${compilationUnit.importUri} (org from ${entry.key.importUri}): "
               "$childBuilder and ${map[name]}");
@@ -928,6 +997,7 @@
     if (c.options.globalFeatures.nonNullable.isEnabled) {
       switch (c.options.nnbdMode) {
         case NnbdMode.Weak:
+          // Coverage-ignore(suite): Not run.
           // Don't expect strong or invalid.
           if (seenModes[NonNullableByDefaultCompiledMode.Strong.index] ||
               seenModes[NonNullableByDefaultCompiledMode.Invalid.index]) {
@@ -938,11 +1008,13 @@
           // Don't expect weak or invalid.
           if (seenModes[NonNullableByDefaultCompiledMode.Weak.index] ||
               seenModes[NonNullableByDefaultCompiledMode.Invalid.index]) {
+            // Coverage-ignore-block(suite): Not run.
             kernelTarget.loader.hasInvalidNnbdModeLibrary = true;
           }
           break;
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       // Don't expect strong or invalid.
       if (seenModes[NonNullableByDefaultCompiledMode.Strong.index] ||
           seenModes[NonNullableByDefaultCompiledMode.Invalid.index]) {
@@ -959,6 +1031,7 @@
     return kernelTarget;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// When tracking used libraries we mark them when we use them. To track
   /// correctly we have to unmark before the next iteration to not have too much
   /// marked and therefore incorrectly marked something as used when it is not.
@@ -1016,6 +1089,7 @@
   void _recreateDillTargetIfPackageWasUpdated(
       UriTranslator uriTranslator, CompilerContext c) {
     if (_hasToCheckPackageUris) {
+      // Coverage-ignore-block(suite): Not run.
       // The package file was changed.
       // Make sure the dill loader is on the same page.
       DillTarget oldDillLoadedData = _dillLoadedData!;
@@ -1045,7 +1119,9 @@
     for (LibraryBuilder builder in reusedResult.notReusedLibraries) {
       _cleanupSourcesForBuilder(lastGoodKernelTarget, reusedResult, builder,
           uriTranslator, CompilerContext.current.uriToSource);
-      _incrementalSerializer?.invalidate(builder.fileUri);
+      _incrementalSerializer
+          // Coverage-ignore(suite): Not run.
+          ?.invalidate(builder.fileUri);
 
       LibraryBuilder? dillBuilder =
           _dillLoadedData!.loader.deregisterLibraryBuilder(builder.importUri);
@@ -1093,11 +1169,13 @@
 
     if (!context
         .options.globalFeatures.alternativeInvalidationStrategy.isEnabled) {
+      // Coverage-ignore-block(suite): Not run.
       recorderForTesting?.recordAdvancedInvalidationResult(
           AdvancedInvalidationResult.disabled);
       return null;
     }
     if (_modulesToLoad != null) {
+      // Coverage-ignore-block(suite): Not run.
       recorderForTesting?.recordAdvancedInvalidationResult(
           AdvancedInvalidationResult.modulesToLoad);
       return null;
@@ -1108,6 +1186,7 @@
       return null;
     }
     if (reusedResult.invalidatedBecauseOfPackageUpdate) {
+      // Coverage-ignore-block(suite): Not run.
       recorderForTesting?.recordAdvancedInvalidationResult(
           AdvancedInvalidationResult.packageUpdate);
       return null;
@@ -1169,6 +1248,7 @@
         String? before = textualOutline(previousSource, scannerConfiguration,
             performModelling: true, enablePatterns: enablePatterns);
         if (before == null) {
+          // Coverage-ignore-block(suite): Not run.
           recorderForTesting?.recordAdvancedInvalidationResult(
               AdvancedInvalidationResult.noPreviousOutline);
           return null;
@@ -1241,7 +1321,10 @@
                   AdvancedInvalidationResult.importsFfi);
               return null;
             }
-            for (Reference exportReference in importLibrary.additionalExports) {
+            for (Reference exportReference
+                in importLibrary // Coverage-ignore(suite): Not run.
+                    .additionalExports) {
+              // Coverage-ignore-block(suite): Not run.
               NamedNode? export = exportReference.node;
               if (export is Class) {
                 Class c = export;
@@ -1288,6 +1371,7 @@
       CompilerContext c) async {
     bool bypassCache = false;
     if (!identical(_previousPackagesUri, c.options.packagesUriRaw)) {
+      // Coverage-ignore-block(suite): Not run.
       _previousPackagesUri = c.options.packagesUriRaw;
       bypassCache = true;
     } else if (this._invalidatedUris.contains(c.options.packagesUri)) {
@@ -1302,6 +1386,7 @@
     _hasToCheckPackageUris = _hasToCheckPackageUris || bypassCache;
     _ticker.logMs("Read packages file");
     if (_initializedForExpressionCompilationOnly) {
+      // Coverage-ignore-block(suite): Not run.
       _hasToCheckPackageUris = false;
     }
     return uriTranslator;
@@ -1344,6 +1429,7 @@
         if (builder.importUri.isScheme("dart")) {
           _platformBuilders!.add(builder);
         } else {
+          // Coverage-ignore-block(suite): Not run.
           _userBuilders![builder.importUri] = builder;
         }
       }
@@ -1353,6 +1439,7 @@
     return data;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Allows for updating the list of needed libraries.
   ///
   /// Useful if a class hierarchy has been used externally.
@@ -1436,6 +1523,7 @@
       return;
     }
     if (macroExecutorFactoryTokens.isNotEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       await Future.wait(notReusedLibraries
           .map((library) => library.importUri)
           .where(macroExecutorFactoryTokens.containsKey)
@@ -1448,7 +1536,10 @@
 
   /// Internal method.
   void _invalidateNotKeptUserBuilders(Set<Uri?> invalidatedUris) {
-    if (_modulesToLoad != null && _userBuilders != null) {
+    if (_modulesToLoad != null &&
+        // Coverage-ignore(suite): Not run.
+        _userBuilders != null) {
+      // Coverage-ignore-block(suite): Not run.
       Set<Library> loadedNotKept = new Set<Library>();
       for (LibraryBuilder builder in _userBuilders!.values) {
         loadedNotKept.add(builder.library);
@@ -1465,6 +1556,7 @@
   /// Internal method.
   void _loadEnsureLoadedComponents(List<LibraryBuilder> reusedLibraries) {
     if (_modulesToLoad != null) {
+      // Coverage-ignore-block(suite): Not run.
       bool loadedAnything = false;
       for (Component module in _modulesToLoad!) {
         bool usedComponent = false;
@@ -1561,6 +1653,7 @@
       }
       if (library.importUri.isScheme("dart")) {
         result.add(library);
+        // Coverage-ignore-block(suite): Not run.
         inputLibrariesFiltered?.add(library);
       } else {
         potentiallyReferencedLibraries[library.importUri] = library;
@@ -1603,6 +1696,7 @@
         if (library != null) {
           result.add(library);
           if (potentiallyReferencedInputLibraries.remove(uri) != null) {
+            // Coverage-ignore-block(suite): Not run.
             inputLibrariesFiltered?.add(library);
           }
           for (LibraryPart part in library.parts) {
@@ -1617,6 +1711,7 @@
     List<Library> removedLibraries = <Library>[];
     bool removedDillBuilders = false;
     for (Uri uri in potentiallyReferencedLibraries.keys) {
+      // Coverage-ignore-block(suite): Not run.
       if (uri.isScheme("package")) continue;
       LibraryBuilder? builder =
           currentKernelTarget.loader.deregisterLoadedLibraryBuilder(uri);
@@ -1647,6 +1742,7 @@
     }
     hierarchy.applyTreeChanges(removedLibraries, const [], const []);
     if (removedDillBuilders) {
+      // Coverage-ignore-block(suite): Not run.
       _makeDillLoaderLibrariesUpToDateWithBuildersMap();
     }
 
@@ -1679,11 +1775,14 @@
       [Map<Uri, Source>? uriToSourceExtra,
       Set<Uri?>? partsUsed]) {
     uriToSource.remove(builder.fileUri);
+    // Coverage-ignore(suite): Not run.
     uriToSourceExtra?.remove(builder.fileUri);
     Library lib = builder.library;
     for (LibraryPart part in lib.parts) {
       Uri? partFileUri = uriTranslator.getPartFileUri(lib.fileUri, part);
-      if (partsUsed != null && partsUsed.contains(partFileUri)) continue;
+      if (partsUsed != null &&
+          // Coverage-ignore(suite): Not run.
+          partsUsed.contains(partFileUri)) continue;
 
       // If the builders map contain the "parts" import uri, it's a real library
       // (erroneously) used as a part so we don't want to remove that.
@@ -1694,7 +1793,9 @@
                 .containsLoadedLibraryBuilder(partImportUri)) {
           continue;
         }
-      } else if (reusedResult != null) {
+      }
+      // Coverage-ignore(suite): Not run.
+      else if (reusedResult != null) {
         // We've just launched and don't have [lastGoodKernelTarget] yet. Search
         // reusedResult for a kept library with this uri.
         bool found = false;
@@ -1710,6 +1811,7 @@
         }
       }
       uriToSource.remove(partFileUri);
+      // Coverage-ignore-block(suite): Not run.
       uriToSourceExtra?.remove(partFileUri);
     }
   }
@@ -1724,6 +1826,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<Procedure?> compileExpression(
     String expression,
     Map<String, DartType> inputDefinitions,
@@ -2002,6 +2105,7 @@
     });
   }
 
+  // Coverage-ignore(suite): Not run.
   bool _packagesEqual(Package? a, Package? b) {
     if (a == null || b == null) return false;
     if (a.name != b.name) return false;
@@ -2045,7 +2149,10 @@
       if (importUri != fileUri && invalidatedUris.contains(fileUri)) {
         return true;
       }
-      if (_hasToCheckPackageUris && importUri.isScheme("package")) {
+      if (_hasToCheckPackageUris &&
+          // Coverage-ignore(suite): Not run.
+          importUri.isScheme("package")) {
+        // Coverage-ignore-block(suite): Not run.
         // Get package name, check if the base URI has changed for the package,
         // if it has, translate the URI again,
         // otherwise the URI cannot have changed.
@@ -2107,6 +2214,7 @@
             libraryBuilder.importUri, libraryBuilder as DillLibraryBuilder);
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       // [lastGoodKernelTarget] was null so we explicitly have to add the
       // builders from [userBuilders] (which cannot be null as we checked
       // initially that one of them was non-null).
@@ -2139,6 +2247,7 @@
       if (current != null) {
         Set<Uri>? s = directDependencies[current.importUri];
         if (current.importUri != removed) {
+          // Coverage-ignore-block(suite): Not run.
           if (s == null) {
             s = directDependencies[removed];
           } else {
@@ -2175,6 +2284,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void invalidateAllSources() {
     IncrementalKernelTarget? lastGoodKernelTarget = this._lastGoodKernelTarget;
     if (lastGoodKernelTarget != null) {
@@ -2191,11 +2301,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void setModulesToLoadOnNextComputeDelta(List<Component> components) {
     _modulesToLoad = components.toList();
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _ExtensionTypeFinder extends VisitorDefault<void> with VisitorVoidMixin {
   static bool isOrContainsExtensionType(DartType type) {
     if (type is ExtensionType) return true;
@@ -2280,12 +2392,14 @@
   ChangedStructureNotifier get changedStructureNotifier => this;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void registerClassMemberChange(Class c) {
     classMemberChanges ??= new Set<Class>();
     classMemberChanges!.add(c);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void registerClassHierarchyChange(Class cls) {
     classHierarchyChanges ??= <Class>{};
     classHierarchyChanges!.add(cls);
@@ -2306,14 +2420,17 @@
         : const _InitializationFromSdkSummary();
   }
 
+  // Coverage-ignore(suite): Not run.
   factory _InitializationStrategy.fromUri(Uri? uri) {
     return uri != null
         ? new _InitializationFromUri(uri)
         : const _InitializationFromSdkSummary();
   }
 
+  // Coverage-ignore(suite): Not run.
   bool get initializedFromDillForTesting => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get initializedIncrementalSerializerForTesting => false;
 
   Future<int> initialize(
@@ -2330,6 +2447,7 @@
   const _InitializationFromSdkSummary();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Future<int> initialize(
       DillTarget dillLoadedData,
       UriTranslator uriTranslator,
@@ -2343,6 +2461,7 @@
         dillLoadedData, summaryBytes, uriTranslator, context, data);
   }
 
+  // Coverage-ignore(suite): Not run.
   int _prepareSummary(
       DillTarget dillLoadedTarget,
       List<int>? summaryBytes,
@@ -2391,8 +2510,13 @@
     Component component = data.component = new Component(
         libraries: componentToInitializeFrom.libraries,
         uriToSource: componentToInitializeFrom.uriToSource)
-      ..setMainMethodAndMode(componentToInitializeFrom.mainMethod?.reference,
-          true, componentToInitializeFrom.mode);
+      ..setMainMethodAndMode(
+          componentToInitializeFrom
+              .mainMethod
+              // Coverage-ignore(suite): Not run.
+              ?.reference,
+          true,
+          componentToInitializeFrom.mode);
     componentProblems.saveComponentProblems(component);
 
     bool foundDartCore = false;
@@ -2415,6 +2539,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _InitializationFromUri extends _InitializationFromSdkSummary {
   Uri initializeFromDillUri;
 
@@ -2588,6 +2713,7 @@
       _remainingComponentProblems.remove(lib.fileUri);
       // Remove parts too.
       for (LibraryPart part in lib.parts) {
+        // Coverage-ignore-block(suite): Not run.
         Uri? partFileUri = uriTranslator.getPartFileUri(lib.fileUri, part);
         _remainingComponentProblems.remove(partFileUri);
       }
@@ -2607,6 +2733,7 @@
     // Report old problems that wasn't reported again.
     for (MapEntry<Uri, List<DiagnosticMessageFromJson>> entry
         in _remainingComponentProblems.entries) {
+      // Coverage-ignore-block(suite): Not run.
       List<DiagnosticMessageFromJson> messages = entry.value;
       for (int i = 0; i < messages.length; i++) {
         DiagnosticMessageFromJson message = messages[i];
@@ -2632,6 +2759,7 @@
             new DiagnosticMessageFromJson.fromJson(jsonString);
         assert(
             message.uri != null ||
+                // Coverage-ignore(suite): Not run.
                 (message.involvedFiles != null &&
                     message.involvedFiles!.isNotEmpty),
             jsonString);
@@ -2642,6 +2770,7 @@
           messages.add(message);
         }
         if (message.involvedFiles != null) {
+          // Coverage-ignore-block(suite): Not run.
           // This indexes the same message under several uris - this way it will
           // be issued as long as it's a problem. It will because of
           // deduplication when we re-issue these (in reissueComponentProblems)
@@ -2662,6 +2791,7 @@
   Uri? getPartFileUri(Uri parentFileUri, LibraryPart part) {
     Uri? fileUri = getPartUri(parentFileUri, part);
     if (fileUri.isScheme("package")) {
+      // Coverage-ignore-block(suite): Not run.
       // Part was specified via package URI and the resolve above thus
       // did not go as expected. Translate the package URI to get the
       // actual file URI.
@@ -2722,13 +2852,18 @@
 class RecorderForTesting {
   const RecorderForTesting();
 
+  // Coverage-ignore(suite): Not run.
   void recordAdvancedInvalidationResult(AdvancedInvalidationResult result) {}
 
+  // Coverage-ignore(suite): Not run.
   void recordNonFullComponent(Component component) {}
 
+  // Coverage-ignore(suite): Not run.
   void recordInvalidatedImportUris(List<Uri> uris) {}
 
+  // Coverage-ignore(suite): Not run.
   void recordRebuildBodiesCount(int count) {}
 
+  // Coverage-ignore(suite): Not run.
   void recordTemporaryFile(Uri uri) {}
 }
diff --git a/pkg/front_end/lib/src/base/incremental_serializer.dart b/pkg/front_end/lib/src/base/incremental_serializer.dart
index 334fa06..dae0ea5 100644
--- a/pkg/front_end/lib/src/base/incremental_serializer.dart
+++ b/pkg/front_end/lib/src/base/incremental_serializer.dart
@@ -12,6 +12,7 @@
 
 import '../kernel/utils.dart' show ByteSink;
 
+// Coverage-ignore(suite): Not run.
 class IncrementalSerializer {
   final Map<Uri, SerializationGroup> uriToGroup =
       new Map<Uri, SerializationGroup>();
@@ -326,6 +327,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class SerializationGroup {
   final Uint8List serializedData;
   final Set<Uri> uris;
diff --git a/pkg/front_end/lib/src/base/library_graph.dart b/pkg/front_end/lib/src/base/library_graph.dart
index 64a5d3b..580d6e94 100644
--- a/pkg/front_end/lib/src/base/library_graph.dart
+++ b/pkg/front_end/lib/src/base/library_graph.dart
@@ -16,12 +16,14 @@
   LibraryGraph(this.libraries);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Uri> get vertices => libraries.keys;
 
   @override
   Iterable<Uri> neighborsOf(Uri vertex) sync* {
     Library? library = libraries[vertex];
     if (library == null) {
+      // Coverage-ignore-block(suite): Not run.
       throw "Library not found: $vertex";
     }
 
diff --git a/pkg/front_end/lib/src/base/problems.dart b/pkg/front_end/lib/src/base/problems.dart
index 1d333d0..f160fac 100644
--- a/pkg/front_end/lib/src/base/problems.dart
+++ b/pkg/front_end/lib/src/base/problems.dart
@@ -20,6 +20,7 @@
         templateInternalProblemUnimplemented,
         templateInternalProblemUnsupported;
 
+// Coverage-ignore(suite): Not run.
 class DebugAbort {
   final LocatedMessage message;
 
@@ -36,6 +37,7 @@
   String toString() => "DebugAbort: ${message.problemMessage}";
 }
 
+// Coverage-ignore(suite): Not run.
 /// Used to report an internal error.
 ///
 /// Internal errors should be avoided as best as possible, but are preferred
@@ -58,6 +60,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 Never unimplemented(String what, int charOffset, Uri? uri) {
   return internalProblem(
       templateInternalProblemUnimplemented.withArguments(what),
@@ -65,6 +68,7 @@
       uri);
 }
 
+// Coverage-ignore(suite): Not run.
 Never unhandled(String what, String where, int charOffset, Uri? uri) {
   return internalProblem(
       templateInternalProblemUnhandled.withArguments(what, where),
@@ -72,6 +76,7 @@
       uri);
 }
 
+// Coverage-ignore(suite): Not run.
 Never unexpected(String expected, String actual, int charOffset, Uri? uri) {
   return internalProblem(
       templateInternalProblemUnexpected.withArguments(expected, actual),
@@ -79,6 +84,7 @@
       uri);
 }
 
+// Coverage-ignore(suite): Not run.
 Never unsupported(String operation, int charOffset, Uri? uri) {
   return internalProblem(
       templateInternalProblemUnsupported.withArguments(operation),
@@ -86,6 +92,7 @@
       uri);
 }
 
+// Coverage-ignore(suite): Not run.
 Uri? getFileUri(TreeNode node) {
   TreeNode? parent = node;
   do {
diff --git a/pkg/front_end/lib/src/base/processed_options.dart b/pkg/front_end/lib/src/base/processed_options.dart
index fd2de74..e094585 100644
--- a/pkg/front_end/lib/src/base/processed_options.dart
+++ b/pkg/front_end/lib/src/base/processed_options.dart
@@ -96,6 +96,7 @@
   /// not been computed yet.
   PackageConfig? get _packages => _packageConfigAndUri?.packageConfig;
 
+  // Coverage-ignore(suite): Not run.
   /// Resolve and return [packagesUri].
   Future<Uri> resolvePackagesFileUri() async {
     await _getPackages();
@@ -145,6 +146,7 @@
   List<int>? _sdkSummaryBytes;
   bool _triedLoadingSdkSummary = false;
 
+  // Coverage-ignore(suite): Not run.
   /// Get the bytes of the SDK outline, if any.
   Future<List<int>?> loadSdkSummaryBytes() async {
     if (_sdkSummaryBytes == null && !_triedLoadingSdkSummary) {
@@ -172,6 +174,7 @@
 
   bool get debugDump => _raw.debugDump;
 
+  // Coverage-ignore(suite): Not run.
   bool get debugDumpShowOffsets => _raw.debugDumpShowOffsets;
 
   bool get omitPlatform => _raw.omitPlatform;
@@ -182,12 +185,15 @@
 
   bool get throwOnErrorsForDebugging => _raw.throwOnErrorsForDebugging;
 
+  // Coverage-ignore(suite): Not run.
   bool get throwOnWarningsForDebugging => _raw.throwOnWarningsForDebugging;
 
+  // Coverage-ignore(suite): Not run.
   bool get emitDeps => _raw.emitDeps;
 
   NnbdMode get nnbdMode => _raw.nnbdMode;
 
+  // Coverage-ignore(suite): Not run.
   bool get enableUnscheduledExperiments => _raw.enableUnscheduledExperiments;
 
   bool get hasAdditionalDills => _raw.additionalDills.isNotEmpty;
@@ -206,6 +212,7 @@
   int fatalDiagnosticCount = 0;
 
   MacroSerializer? _macroSerializer;
+  // Coverage-ignore(suite): Not run.
   MacroSerializer get macroSerializer =>
       _macroSerializer ??= _raw.macroSerializer ?? new MacroSerializer();
 
@@ -244,11 +251,13 @@
       {List<LocatedMessage>? context, List<Uri>? involvedFiles}) {
     if (command_line_reporting.isHidden(severity)) return;
     if (CompilerContext.current.options.setExitCodeOnProblem) {
+      // Coverage-ignore-block(suite): Not run.
       exitCode = 1;
     }
     reportDiagnosticMessage(
         format(message, severity, context, involvedFiles: involvedFiles));
     if (command_line_reporting.shouldThrowOn(severity)) {
+      // Coverage-ignore-block(suite): Not run.
       if (fatalDiagnosticCount++ < _raw.skipForDebugging) {
         // Skip this one. The interesting one comes later.
         return;
@@ -265,7 +274,8 @@
   }
 
   void reportDiagnosticMessage(DiagnosticMessage message) {
-    (_raw.onDiagnostic ?? defaultDiagnosticMessageHandler)(message);
+    (_raw.onDiagnostic ?? // Coverage-ignore(suite): Not run.
+        defaultDiagnosticMessageHandler)(message);
   }
 
   /// Returns [error] as a message from the OS.
@@ -274,9 +284,11 @@
   /// be a fixed string, otherwise the toString of [error] will be returned.
   String osErrorMessage(Object? error) {
     if (_raw.omitOsMessageForTesting) return '<os-message>';
+    // Coverage-ignore(suite): Not run.
     return '$error';
   }
 
+  // Coverage-ignore(suite): Not run.
   void defaultDiagnosticMessageHandler(DiagnosticMessage message) {
     if (Verbosity.shouldPrint(_raw.verbosity, message)) {
       printDiagnosticMessage(message, print);
@@ -292,6 +304,7 @@
   /// info message about the null safety compilation mode is emitted.
   void reportNullSafetyCompilationModeInfo() {
     if (_raw.invocationModes.contains(InvocationMode.compile)) {
+      // Coverage-ignore-block(suite): Not run.
       switch (nnbdMode) {
         case NnbdMode.Weak:
           reportWithoutLocation(messageCompilingWithoutSoundNullSafety,
@@ -314,16 +327,20 @@
     _validated = true;
 
     if (verbose) {
+      // Coverage-ignore-block(suite): Not run.
       print(debugString());
     }
 
     if (errorOnMissingInput && inputs.isEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       reportWithoutLocation(messageMissingInput, Severity.error);
       return false;
     }
 
     if (_raw.sdkRoot != null &&
+        // Coverage-ignore(suite): Not run.
         !await fileSystem.entityForUri(sdkRoot!).exists()) {
+      // Coverage-ignore-block(suite): Not run.
       reportWithoutLocation(
           templateSdkRootNotFound.withArguments(sdkRoot!), Severity.error);
       return false;
@@ -331,12 +348,14 @@
 
     Uri? summary = sdkSummary;
     if (summary != null && !await fileSystem.entityForUri(summary).exists()) {
+      // Coverage-ignore-block(suite): Not run.
       reportWithoutLocation(
           templateSdkSummaryNotFound.withArguments(summary), Severity.error);
       return false;
     }
 
     if (compileSdk && summary != null) {
+      // Coverage-ignore-block(suite): Not run.
       reportWithoutLocation(
           messageInternalProblemProvidedBothCompileSdkAndSdkSummary,
           Severity.internalProblem);
@@ -344,6 +363,7 @@
     }
 
     for (Uri source in _raw.additionalDills) {
+      // Coverage-ignore-block(suite): Not run.
       // TODO(ahe): Remove this check, the compiler itself should handle and
       // recover from this.
       if (!await fileSystem.entityForUri(source).exists()) {
@@ -359,6 +379,7 @@
       bool value = entry.value;
       if (experimentalFlag.isExpired &&
           value != experimentalFlag.isEnabledByDefault) {
+        // Coverage-ignore-block(suite): Not run.
         if (value) {
           reportWithoutLocation(
               templateExperimentExpiredEnabled
@@ -390,6 +411,7 @@
   /// effect.
   void clearFileSystemCache() => _fileSystem = null;
 
+  // Coverage-ignore(suite): Not run.
   /// Whether to write a file (e.g. a dill file) when reporting a crash.
   bool get writeFileOnCrashReport => _raw.writeFileOnCrashReport;
 
@@ -400,12 +422,14 @@
 
   Target? _target;
   Target get target => _target ??= _raw.target ??
+      // Coverage-ignore(suite): Not run.
       new NoneTarget(
           new TargetFlags(soundNullSafety: nnbdMode == NnbdMode.Strong));
 
   /// Returns the global state of the experimental features.
   flags.GlobalFeatures get globalFeatures => _raw.globalFeatures;
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the minimum language version needed for a library with the given
   /// [importUri] to opt into the experiment with the given [flag].
   ///
@@ -444,6 +468,7 @@
   // TODO(sigmund): move, this doesn't feel like an "option".
   Future<Component?> loadSdkSummary(CanonicalName? nameRoot) async {
     if (_sdkSummaryComponent == null) {
+      // Coverage-ignore-block(suite): Not run.
       if (sdkSummary == null) return null;
       List<int>? bytes = await loadSdkSummaryBytes();
       if (bytes != null && bytes.isNotEmpty) {
@@ -462,6 +487,7 @@
     _sdkSummaryComponent = platform;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Get the components for each of the underlying `additionalDill`
   /// provided via [CompilerOptions].
   // TODO(sigmund): move, this doesn't feel like an "option".
@@ -483,6 +509,7 @@
     return _additionalDillComponents!;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Helper to load a .dill file from [uri] using the existing [nameRoot].
   Component loadComponent(List<int> bytes, CanonicalName? nameRoot,
       {bool? alwaysCreateNewNamedNodes, Uri? fileUri}) {
@@ -503,6 +530,7 @@
   /// required to locate/read the packages file as well as SDK metadata.
   Future<UriTranslator> getUriTranslator({bool bypassCache = false}) async {
     if (bypassCache) {
+      // Coverage-ignore-block(suite): Not run.
       _uriTranslator = null;
       _packageConfigAndUri = null;
     }
@@ -523,12 +551,14 @@
     // TODO(sigmund): Eek! We should get to the point where there is no
     // fasta-specific targets and the target names are meaningful.
     if (name.endsWith('_fasta')) {
+      // Coverage-ignore-block(suite): Not run.
       name = name.substring(0, name.length - 6);
     }
 
     if (librariesSpecificationUri == null ||
         !await fileSystem.entityForUri(librariesSpecificationUri!).exists()) {
       if (compileSdk) {
+        // Coverage-ignore-block(suite): Not run.
         reportWithoutLocation(
             templateSdkSpecificationNotFound
                 .withArguments(librariesSpecificationUri!),
@@ -542,7 +572,9 @@
           librariesSpecificationUri!,
           (Uri uri) => fileSystem.entityForUri(uri).readAsString());
       return spec.specificationFor(name);
-    } on LibrariesSpecificationException catch (e) {
+    }
+    // Coverage-ignore(suite): Not run.
+    on LibrariesSpecificationException catch (e) {
       reportWithoutLocation(
           templateCannotReadSdkSpecification.withArguments('${e.error}'),
           Severity.error);
@@ -556,6 +588,7 @@
   /// required to locate/read the packages file.
   Future<PackageConfig> _getPackages() async {
     if (_packages != null) {
+      // Coverage-ignore-block(suite): Not run.
       return _packages!;
     }
     _packageConfigAndUri = null;
@@ -565,6 +598,7 @@
       return _packages!;
     }
 
+    // Coverage-ignore-block(suite): Not run.
     if (inputs.isEmpty) {
       _packageConfigAndUri = _PackageConfigAndUri.empty;
       return _packages!;
@@ -608,13 +642,17 @@
       if (fileContents is Uint8List) {
         return fileContents;
       } else {
+        // Coverage-ignore-block(suite): Not run.
         return new Uint8List.fromList(fileContents);
       }
-    } on FileSystemException catch (e) {
+    }
+    // Coverage-ignore(suite): Not run.
+    on FileSystemException catch (e) {
       reportWithoutLocation(
           templateCantReadFile.withArguments(uri, osErrorMessage(e.message)),
           Severity.error);
     } catch (e) {
+      // Coverage-ignore-block(suite): Not run.
       Message message = templateExceptionReadingFile.withArguments(uri, '$e');
       reportWithoutLocation(message, Severity.error);
       // We throw a new exception to ensure that the message include the uri
@@ -637,11 +675,14 @@
     Uint8List? contents =
         requestedUri == new Uri() ? null : await _readFile(requestedUri);
     if (contents == null) {
+      // Coverage-ignore-block(suite): Not run.
       return _PackageConfigAndUri.empty;
     }
 
     try {
-      void Function(Object error) onError = (Object error) {
+      void Function(Object error) onError =
+          // Coverage-ignore(suite): Not run.
+          (Object error) {
         if (error is FormatException) {
           report(
               templatePackagesFileFormat
@@ -658,20 +699,25 @@
       return new _PackageConfigAndUri(
           PackageConfig.parseBytes(contents, requestedUri, onError: onError),
           requestedUri);
-    } on FormatException catch (e) {
+    }
+    // Coverage-ignore(suite): Not run.
+    on FormatException catch (e) {
       report(
           templatePackagesFileFormat
               .withArguments(e.message)
               .withLocation(requestedUri, e.offset ?? -1, noLength),
           Severity.error);
     } catch (e) {
+      // Coverage-ignore-block(suite): Not run.
       reportWithoutLocation(
           templateCantReadFile.withArguments(requestedUri, "$e"),
           Severity.error);
     }
+    // Coverage-ignore(suite): Not run.
     return _PackageConfigAndUri.empty;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Create a [PackageConfig] given the Uri to a `package_config.json` file,
   /// and use it in these options.
   ///
@@ -681,6 +727,7 @@
     return _packageConfigAndUri!.packageConfig;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Finds a package resolution strategy using a [FileSystem].
   ///
   /// The [scriptUri] points to a Dart script with a valid scheme accepted by
@@ -753,6 +800,7 @@
     _computedSdkDefaults = true;
     Uri? root = _raw.sdkRoot;
     if (root != null) {
+      // Coverage-ignore-block(suite): Not run.
       // Normalize to always end in '/'
       if (!root.path.endsWith('/')) {
         root = root.replace(path: root.path + '/');
@@ -766,7 +814,9 @@
 
     if (_raw.sdkSummary != null) {
       _sdkSummary = _raw.sdkSummary;
-    } else if (!compileSdk) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (!compileSdk) {
       // Infer based on the sdkRoot, but only when `compileSdk` is false,
       // otherwise the default intent was to compile the sdk from sources and
       // not to load an sdk summary file.
@@ -776,6 +826,7 @@
     if (_raw.librariesSpecificationUri != null) {
       _librariesSpecificationUri = _raw.librariesSpecificationUri;
     } else if (compileSdk) {
+      // Coverage-ignore-block(suite): Not run.
       _librariesSpecificationUri = sdkRoot!.resolve('lib/libraries.json');
     }
   }
@@ -831,6 +882,7 @@
     return '$sb';
   }
 
+  // Coverage-ignore(suite): Not run.
   Future<List<int>?> _readAsBytes(FileSystemEntity file) async {
     try {
       return await file.readAsBytes();
@@ -844,6 +896,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   MultiMacroExecutor get macroExecutor {
     if (_raw.macroExecutor != null) return _raw.macroExecutor!;
 
@@ -886,9 +939,11 @@
     return executor;
   }
 
+  // Coverage-ignore(suite): Not run.
   SerializationMode get macroSerializationMode =>
       _raw.macroSerializationMode ??= SerializationMode.byteData;
 
+  // Coverage-ignore(suite): Not run.
   /// The currently running precompilations.
   Set<Uri> get runningPrecompilations => _raw.runningPrecompilations;
 
@@ -896,15 +951,18 @@
 
   HooksForTesting? get hooksForTesting => _raw.hooksForTesting;
 
+  // Coverage-ignore(suite): Not run.
   bool get showGeneratedMacroSourcesForTesting =>
       _raw.showGeneratedMacroSourcesForTesting;
 
+  // Coverage-ignore(suite): Not run.
   /// Disposes macro executor and serializer if configured.
   Future<void> dispose() async {
     await _raw.macroExecutor?.closeAndReset();
     await macroSerializer.close();
   }
 
+  // Coverage-ignore(suite): Not run.
   bool equivalent(ProcessedOptions other,
       {bool ignoreOnDiagnostic = true,
       bool ignoreVerbose = true,
@@ -916,6 +974,7 @@
 
 /// A package config and the `URI` it was loaded from.
 class _PackageConfigAndUri {
+  // Coverage-ignore(suite): Not run.
   static final _PackageConfigAndUri empty =
       new _PackageConfigAndUri(PackageConfig.empty, new Uri());
 
diff --git a/pkg/front_end/lib/src/base/scope.dart b/pkg/front_end/lib/src/base/scope.dart
index e98497c..985ba93 100644
--- a/pkg/front_end/lib/src/base/scope.dart
+++ b/pkg/front_end/lib/src/base/scope.dart
@@ -346,6 +346,7 @@
         }
 
         if (existingGetter == null) {
+          // Coverage-ignore-block(suite): Not run.
           // No existing getter.
           if (replacementGetterFromSetter != null) {
             // We might have had one implicitly from the setter. Use it here,
@@ -358,8 +359,10 @@
           // The existing getter should be replaced.
           if (replacementGetterFromGetter != null) {
             // With a new getter.
-            (_local ??= {})[name] = replacementGetterFromGetter;
+            (_local ??= // Coverage-ignore(suite): Not run.
+                {})[name] = replacementGetterFromGetter;
           } else {
+            // Coverage-ignore-block(suite): Not run.
             // With `null`, i.e. removed. This means that the getter is
             // implicitly available through the setter. (This is currently not
             // possible, but handled here to match the case for setters below).
@@ -373,16 +376,16 @@
           if (replacementSetterFromGetter != null) {
             // We might have had one implicitly from the getter. Use it here,
             // if so.
-            (_setters ??= {})[name] =
-                replacementSetterFromGetter as MemberBuilder;
+            (_setters ??= // Coverage-ignore(suite): Not run.
+                {})[name] = replacementSetterFromGetter as MemberBuilder;
           }
         } else if (existingSetter.parent ==
             replacementLibraryBuilderFromSetter) {
           // The existing setter should be replaced.
           if (replacementSetterFromSetter != null) {
             // With a new setter.
-            (_setters ??= {})[name] =
-                replacementSetterFromSetter as MemberBuilder;
+            (_setters ??= // Coverage-ignore(suite): Not run.
+                {})[name] = replacementSetterFromSetter as MemberBuilder;
           } else {
             // With `null`, i.e. removed. This means that the setter is
             // implicitly available through the getter. This happens when the
@@ -395,6 +398,7 @@
       }
     }
     if (_extensions != null) {
+      // Coverage-ignore-block(suite): Not run.
       bool needsPatching = false;
       for (ExtensionBuilder extensionBuilder in _extensions!) {
         if (replacementMap.containsKey(extensionBuilder.parent)) {
@@ -424,6 +428,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   Scope copyWithParent(Scope parent, String debugName) {
     return new Scope(
         kind: kind,
@@ -435,6 +440,7 @@
         isModifiable: isModifiable);
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Don't use this. Use [becomePartOf] instead.
   void set parent(_) => unsupported("parent=", -1, null);
 
@@ -515,8 +521,15 @@
     Builder? builder = map[name];
     if (builder == null) return null;
     if (builder.next != null) {
-      return new AmbiguousBuilder(name.isEmpty ? classNameOrDebugName : name,
-          builder, charOffset, fileUri);
+      return new AmbiguousBuilder(
+          name.isEmpty
+              ?
+              // Coverage-ignore(suite): Not run.
+              classNameOrDebugName
+              : name,
+          builder,
+          charOffset,
+          fileUri);
     } else if (!isInstanceScope && builder.isDeclarationInstanceMember) {
       return null;
     } else if (builder is MemberBuilder && builder.isConflictingSetter) {
@@ -576,7 +589,8 @@
 
   void addLocalMember(String name, Builder member, {required bool setter}) {
     if (setter) {
-      (_setters ??= {})[name] = member as MemberBuilder;
+      (_setters ??= // Coverage-ignore(suite): Not run.
+          {})[name] = member as MemberBuilder;
     } else {
       (_local ??= {})[name] = member;
     }
@@ -683,11 +697,13 @@
     }
 
     if (scope._local != null) {
-      map = _local ??= {};
+      map = _local ??= // Coverage-ignore(suite): Not run.
+          {};
       scope._local?.forEach(mergeMember);
     }
     if (scope._setters != null) {
-      map = _setters ??= {};
+      map = _setters ??= // Coverage-ignore(suite): Not run.
+          {};
       scope._setters?.forEach(mergeMember);
     }
     if (scope._extensions != null) {
@@ -704,6 +720,7 @@
     return "$buffer";
   }
 
+  // Coverage-ignore(suite): Not run.
   int writeOn(StringSink sink) {
     int nestingLevel = (_parent?.writeOn(sink) ?? -1) + 1;
     String indent = "  " * nestingLevel;
@@ -871,6 +888,7 @@
   Builder? get parent => builder.parent;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isFinal => builder.isFinal;
 
   @override
@@ -902,6 +920,7 @@
   bool get isStatic => builder.isStatic;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isTopLevel => builder.isTopLevel;
 
   @override
@@ -911,6 +930,7 @@
   bool get isLocal => builder.isLocal;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Message get message => templateAccessError.withArguments(name);
 }
 
@@ -919,11 +939,13 @@
       : super(name, builder, charOffset, fileUri);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Builder? get parent => null;
 
   @override
   Message get message => templateDuplicatedDeclarationUse.withArguments(name);
 
+  // Coverage-ignore(suite): Not run.
   // TODO(ahe): Also provide context.
 
   Builder getFirstDeclaration() {
@@ -937,33 +959,43 @@
 
 mixin ErroneousMemberBuilderMixin implements SourceMemberBuilder {
   @override
+  // Coverage-ignore(suite): Not run.
   MemberDataForTesting? get dataForTesting => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get member => throw new UnsupportedError('$runtimeType.member');
 
   @override
+  // Coverage-ignore(suite): Not run.
   Name get memberName => throw new UnsupportedError('$runtimeType.memberName');
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get readTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get invokeTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Member> get exportedMembers => const [];
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isAssignable => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isExternal => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isAbstract => false;
 
   @override
@@ -999,6 +1031,7 @@
 
   // TODO(johnniwinther): Remove this and create a [ProcedureBuilder] interface.
   @override
+  // Coverage-ignore(suite): Not run.
   ProcedureKind? get kind => null;
 
   @override
@@ -1010,29 +1043,35 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void buildOutlineNodes(BuildNodesCallback f) {
     assert(false, "Unexpected call to $runtimeType.buildOutlineNodes.");
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int buildBodyNodes(BuildNodesCallback f) {
     assert(false, "Unexpected call to $runtimeType.buildBodyNodes.");
     return 0;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get localMembers => const <ClassMember>[];
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get localSetters => const <ClassMember>[];
 
   @override
+  // Coverage-ignore(suite): Not run.
   void checkVariance(
       SourceClassBuilder sourceClassBuilder, TypeEnvironment typeEnvironment) {
     assert(false, "Unexpected call to $runtimeType.checkVariance.");
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void checkTypes(
       SourceLibraryBuilder library, TypeEnvironment typeEnvironment) {
     assert(false, "Unexpected call to $runtimeType.checkVariance.");
@@ -1124,7 +1163,8 @@
 
   @override
   Builder get current {
-    return _current ?? (throw new StateError('No element'));
+    return _current ?? // Coverage-ignore(suite): Not run.
+        (throw new StateError('No element'));
   }
 }
 
@@ -1192,7 +1232,8 @@
 
   @override
   String get name {
-    return _name ?? (throw new StateError('No element'));
+    return _name ?? // Coverage-ignore(suite): Not run.
+        (throw new StateError('No element'));
   }
 }
 
@@ -1222,7 +1263,8 @@
 
   @override
   MemberBuilder get current {
-    return _current ?? (throw new StateError('No element'));
+    return _current ?? // Coverage-ignore(suite): Not run.
+        (throw new StateError('No element'));
   }
 }
 
@@ -1261,7 +1303,8 @@
 
   @override
   String get name {
-    return _name ?? (throw new StateError('No element'));
+    return _name ?? // Coverage-ignore(suite): Not run.
+        (throw new StateError('No element'));
   }
 }
 
@@ -1352,6 +1395,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   List<T> toList() {
     List<T> list = [];
     while (moveNext()) {
@@ -1421,6 +1465,7 @@
                 ? templateNonPatchLibraryConflict.withArguments(name)
                 : templateNonAugmentationLibraryConflict.withArguments(name);
           } else {
+            // Coverage-ignore-block(suite): Not run.
             message = inPatchLibrary
                 ? templateNonPatchClassMemberConflict.withArguments(name)
                 : templateNonAugmentationClassMemberConflict
@@ -1456,7 +1501,9 @@
         } else {
           message = inPatchLibrary
               ? templateUnmatchedPatchDeclaration.withArguments(name)
-              : templateUnmatchedAugmentationDeclaration.withArguments(name);
+              :
+              // Coverage-ignore(suite): Not run.
+              templateUnmatchedAugmentationDeclaration.withArguments(name);
         }
         originLibrary.addProblem(
             message, newBuilder.charOffset, name.length, newBuilder.fileUri);
@@ -1617,7 +1664,9 @@
               inPatchLibrary
                   ? templateNonPatchConstructorConflict
                       .withArguments(newConstructor.fullNameForErrors)
-                  : templateNonAugmentationConstructorConflict
+                  :
+                  // Coverage-ignore(suite): Not run.
+                  templateNonAugmentationConstructorConflict
                       .withArguments(newConstructor.fullNameForErrors),
               newConstructor.charOffset,
               noLength,
@@ -1635,7 +1684,9 @@
               inPatchLibrary
                   ? templateUnmatchedPatchConstructor
                       .withArguments(newConstructor.fullNameForErrors)
-                  : templateUnmatchedAugmentationConstructor
+                  :
+                  // Coverage-ignore(suite): Not run.
+                  templateUnmatchedAugmentationConstructor
                       .withArguments(newConstructor.fullNameForErrors),
               newConstructor.charOffset,
               noLength,
@@ -1644,6 +1695,7 @@
           _originConstructorScope.addLocalMember(name, newConstructor);
           for (ConstructorScope augmentationConstructorScope
               in _augmentationConstructorScopes.values) {
+            // Coverage-ignore-block(suite): Not run.
             _addConstructorToAugmentationScope(
                 augmentationConstructorScope, name, newConstructor);
           }
@@ -1651,6 +1703,7 @@
         if (inPatchLibrary &&
             !name.startsWith('_') &&
             !_allowInjectedPublicMember(newConstructor)) {
+          // Coverage-ignore-block(suite): Not run.
           originLibrary.addProblem(
               templatePatchInjectionFailed.withArguments(
                   name, originLibrary.importUri),
@@ -1694,6 +1747,7 @@
       return true;
     }
     if (newBuilder.isStatic) {
+      // Coverage-ignore-block(suite): Not run.
       return _origin.name.startsWith('_');
     }
     // TODO(johnniwinther): Restrict the use of injected public class members.
@@ -1705,6 +1759,7 @@
   bool get isAugmentation {
     Builder self = this;
     if (self is SourceLibraryBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       return self.isAugmentationLibrary;
     } else if (self is SourceClassBuilder) {
       return self.isAugmentation;
@@ -1758,6 +1813,7 @@
     } else if (self is SourceExtensionBuilder) {
       return _hasPatchAnnotation(self.metadata);
     } else if (self is SourceExtensionTypeDeclarationBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       return _hasPatchAnnotation(self.metadata);
     }
     return false;
@@ -1777,6 +1833,7 @@
     if (_current != null) {
       return _current!.current;
     }
+    // Coverage-ignore-block(suite): Not run.
     throw new StateError("No current element");
   }
 
diff --git a/pkg/front_end/lib/src/base/ticker.dart b/pkg/front_end/lib/src/base/ticker.dart
index 35b1ac5..07201c1 100644
--- a/pkg/front_end/lib/src/base/ticker.dart
+++ b/pkg/front_end/lib/src/base/ticker.dart
@@ -16,7 +16,9 @@
   }
 
   void logMs(Object message) {
-    log((Duration elapsed, Duration sinceStart) {
+    log(
+        // Coverage-ignore(suite): Not run.
+        (Duration elapsed, Duration sinceStart) {
       print("$sinceStart: $message in ${elapsed.inMilliseconds}ms.");
     });
   }
@@ -25,6 +27,7 @@
     Duration elapsed = sw.elapsed;
     try {
       if (isVerbose) {
+        // Coverage-ignore-block(suite): Not run.
         f(elapsed - previousTick, elapsed);
       }
     } finally {
diff --git a/pkg/front_end/lib/src/base/uri_translator.dart b/pkg/front_end/lib/src/base/uri_translator.dart
index 7143f38..be84e6a 100644
--- a/pkg/front_end/lib/src/base/uri_translator.dart
+++ b/pkg/front_end/lib/src/base/uri_translator.dart
@@ -21,6 +21,7 @@
   List<Uri>? getDartPatches(String libraryName) =>
       dartLibraries.libraryInfoFor(libraryName)?.patches;
 
+  // Coverage-ignore(suite): Not run.
   bool isPlatformImplementation(Uri uri) {
     if (!uri.isScheme("dart")) return false;
     String path = uri.path;
@@ -67,7 +68,9 @@
             : _packageUriNotFoundNoReport)(uri);
       }
       return translated;
-    } on ArgumentError catch (e) {
+    }
+    // Coverage-ignore(suite): Not run.
+    on ArgumentError catch (e) {
       // TODO(sigmund): catch a more precise error when
       // https://github.com/dart-lang/package_config/issues/40 is fixed.
       if (reportMessage) {
@@ -88,6 +91,7 @@
     return null;
   }
 
+  // Coverage-ignore(suite): Not run.
   static Uri? _packageUriNotFoundNoReport(Uri uri) {
     return null;
   }
diff --git a/pkg/front_end/lib/src/base/uris.dart b/pkg/front_end/lib/src/base/uris.dart
index b6191c6..0ae4242 100644
--- a/pkg/front_end/lib/src/base/uris.dart
+++ b/pkg/front_end/lib/src/base/uris.dart
@@ -64,7 +64,9 @@
 Uri getPartUri(Uri parentUri, LibraryPart part) {
   try {
     return parentUri.resolve(part.partUri);
-  } on FormatException {
+  }
+  // Coverage-ignore(suite): Not run.
+  on FormatException {
     // This is also done in [SourceLibraryBuilder.resolve]
     return new Uri(
         scheme: MALFORMED_URI_SCHEME,
diff --git a/pkg/front_end/lib/src/builder/augmentation_iterator.dart b/pkg/front_end/lib/src/builder/augmentation_iterator.dart
index 2389b44..c597b66 100644
--- a/pkg/front_end/lib/src/builder/augmentation_iterator.dart
+++ b/pkg/front_end/lib/src/builder/augmentation_iterator.dart
@@ -1,3 +1,4 @@
+// Coverage-ignore(suite): Not run.
 // Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
diff --git a/pkg/front_end/lib/src/builder/builder.dart b/pkg/front_end/lib/src/builder/builder.dart
index dd29471..ea554d0 100644
--- a/pkg/front_end/lib/src/builder/builder.dart
+++ b/pkg/front_end/lib/src/builder/builder.dart
@@ -274,9 +274,11 @@
   bool get hasProblem => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isConst => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isConstructor => false;
 
   @override
@@ -286,6 +288,7 @@
   bool get isField => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isFinal => false;
 
   @override
@@ -295,15 +298,19 @@
   bool get isExtension => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isDeclarationMember => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isClassMember => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isExtensionMember => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isExtensionTypeMember => false;
 
   @override
@@ -337,15 +344,18 @@
   bool get isSetter => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isStatic => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isExternal => false;
 
   @override
   bool get isSynthetic => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isTopLevel => false;
 
   @override
@@ -355,6 +365,7 @@
   bool get isTypeVariable => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void applyAugmentation(Builder augmentation) {
     unsupported("${runtimeType}.applyAugmentation", charOffset, fileUri);
   }
diff --git a/pkg/front_end/lib/src/builder/builtin_type_declaration_builder.dart b/pkg/front_end/lib/src/builder/builtin_type_declaration_builder.dart
index 12d22e4..fef0866 100644
--- a/pkg/front_end/lib/src/builder/builtin_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/builder/builtin_type_declaration_builder.dart
@@ -30,6 +30,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType buildAliasedTypeWithBuiltArguments(
       LibraryBuilder library,
       Nullability nullability,
diff --git a/pkg/front_end/lib/src/builder/class_builder.dart b/pkg/front_end/lib/src/builder/class_builder.dart
index 083b303..58efb80 100644
--- a/pkg/front_end/lib/src/builder/class_builder.dart
+++ b/pkg/front_end/lib/src/builder/class_builder.dart
@@ -204,7 +204,9 @@
 
   @override
   bool get isAnonymousMixinApplication {
-    return isMixinApplication && !isNamedMixinApplication;
+    return isMixinApplication &&
+        // Coverage-ignore(suite): Not run.
+        !isNamedMixinApplication;
   }
 
   @override
@@ -236,6 +238,7 @@
       {bool setter = false, bool required = false}) {
     Builder? builder = scope.lookupLocalMember(name, setter: setter);
     if (builder == null && isAugmenting) {
+      // Coverage-ignore-block(suite): Not run.
       builder = origin.scope.lookupLocalMember(name, setter: setter);
     }
     if (required && builder == null) {
@@ -271,6 +274,7 @@
         getAsTypeArguments(cls.typeParameters, libraryBuilder.library));
   }
 
+  // Coverage-ignore(suite): Not run.
   InterfaceType get legacyRawType {
     return _legacyRawType ??= new InterfaceType(cls, Nullability.legacy,
         new List<DartType>.filled(typeVariablesCount, const DynamicType()));
@@ -291,11 +295,13 @@
   InterfaceType rawType(Nullability nullability) {
     switch (nullability) {
       case Nullability.legacy:
+        // Coverage-ignore(suite): Not run.
         return legacyRawType;
       case Nullability.nullable:
         return nullableRawType;
       case Nullability.nonNullable:
         return nonNullableRawType;
+      // Coverage-ignore(suite): Not run.
       case Nullability.undetermined:
         return unhandled("$nullability", "rawType", TreeNode.noOffset, noUri);
     }
@@ -329,13 +335,17 @@
       return rawType(nullability);
     }
     if (aliasedTypeWithBuiltArgumentsCacheNonNullable != null &&
+        // Coverage-ignore(suite): Not run.
         nullability == Nullability.nonNullable) {
+      // Coverage-ignore-block(suite): Not run.
       assert(aliasedTypeWithBuiltArgumentsCacheNonNullable!.classReference ==
           cls.reference);
       assert(arguments.isEmpty);
       return aliasedTypeWithBuiltArgumentsCacheNonNullable!;
     } else if (aliasedTypeWithBuiltArgumentsCacheNullable != null &&
+        // Coverage-ignore(suite): Not run.
         nullability == Nullability.nullable) {
+      // Coverage-ignore-block(suite): Not run.
       assert(aliasedTypeWithBuiltArgumentsCacheNullable!.classReference ==
           cls.reference);
       assert(arguments.isEmpty);
@@ -343,6 +353,7 @@
     }
     InterfaceType type = new InterfaceType(cls, nullability, arguments);
     if (arguments.isEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       assert(typeVariablesCount == 0);
       if (nullability == Nullability.nonNullable) {
         aliasedTypeWithBuiltArgumentsCacheNonNullable = type;
@@ -373,6 +384,7 @@
         libraryBuilder.importUri.path == "core" &&
         library is SourceLibraryBuilder &&
         !isRecordAccessAllowed(library)) {
+      // Coverage-ignore-block(suite): Not run.
       library.reportFeatureNotEnabled(
           library.libraryFeatures.records, fileUri, charOffset, name.length);
       return const InvalidType();
@@ -390,7 +402,11 @@
   @override
   Supertype buildMixedInType(
       LibraryBuilder library, List<TypeBuilder>? arguments) {
-    Class cls = isAugmenting ? origin.cls : this.cls;
+    Class cls = isAugmenting
+        ?
+        // Coverage-ignore(suite): Not run.
+        origin.cls
+        : this.cls;
     if (arguments != null) {
       List<DartType> typeArguments =
           buildAliasedTypeArguments(library, arguments, /* hierarchy = */ null);
@@ -418,6 +434,7 @@
       {bool isSetter = false, bool isSuper = false}) {
     Class? instanceClass = cls;
     if (isAugmenting) {
+      // Coverage-ignore-block(suite): Not run.
       assert(identical(instanceClass, origin.cls),
           "Found ${origin.cls} expected $instanceClass");
       if (isSuper) {
@@ -442,7 +459,9 @@
     }
     Member? target = isSuper
         ? hierarchy.getDispatchTarget(instanceClass, name, setter: isSetter)
-        : hierarchy.getInterfaceMember(instanceClass, name, setter: isSetter);
+        :
+        // Coverage-ignore(suite): Not run.
+        hierarchy.getInterfaceMember(instanceClass, name, setter: isSetter);
     if (isSuper && target == null) {
       if (cls.isMixinDeclaration) {
         target =
diff --git a/pkg/front_end/lib/src/builder/fixed_type_builder.dart b/pkg/front_end/lib/src/builder/fixed_type_builder.dart
index 998435e..4882626 100644
--- a/pkg/front_end/lib/src/builder/fixed_type_builder.dart
+++ b/pkg/front_end/lib/src/builder/fixed_type_builder.dart
@@ -21,6 +21,7 @@
   const FixedTypeBuilderImpl(this.type, this.fileUri, this.charOffset);
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder clone(
       List<NamedTypeBuilder> newTypes,
       SourceLibraryBuilder contextLibrary,
@@ -29,9 +30,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeName? get typeName => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   NullabilityBuilder get nullabilityBuilder =>
       new NullabilityBuilder.fromNullability(type.nullability);
 
@@ -39,9 +42,11 @@
   String get debugName => 'FixedTypeBuilder';
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isVoidType => type is VoidType;
 
   @override
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) {
     buffer.write('type=${type}');
     return buffer;
@@ -60,21 +65,25 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Supertype buildSupertype(LibraryBuilder library, TypeUse typeUse) {
     return unhandled(
         'buildSupertype', 'FixedTypeBuilder', charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Supertype buildMixedInType(LibraryBuilder library) {
     return unhandled(
         'buildMixedInType', 'FixedTypeBuilder', charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder withNullabilityBuilder(NullabilityBuilder nullabilityBuilder) =>
       this;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isExplicit => true;
 }
diff --git a/pkg/front_end/lib/src/builder/formal_parameter_builder.dart b/pkg/front_end/lib/src/builder/formal_parameter_builder.dart
index bb15a6f..a2a4f52 100644
--- a/pkg/front_end/lib/src/builder/formal_parameter_builder.dart
+++ b/pkg/front_end/lib/src/builder/formal_parameter_builder.dart
@@ -153,6 +153,7 @@
       !isSuperInitializingFormal;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullNameForErrors => name;
 
   VariableDeclaration build(SourceLibraryBuilder library) {
@@ -319,6 +320,7 @@
   FunctionTypeParameterBuilder(this.kind, this.type, this.name);
 
   @override
+  // Coverage-ignore(suite): Not run.
   ParameterBuilder clone(
       List<NamedTypeBuilder> newTypes,
       SourceLibraryBuilder contextLibrary,
diff --git a/pkg/front_end/lib/src/builder/function_type_builder.dart b/pkg/front_end/lib/src/builder/function_type_builder.dart
index 174abdd..6abd7e3 100644
--- a/pkg/front_end/lib/src/builder/function_type_builder.dart
+++ b/pkg/front_end/lib/src/builder/function_type_builder.dart
@@ -72,7 +72,9 @@
             fileUri,
             charOffset,
             hasFunctionFormalParameterSyntax)
-        : new _InferredFunctionTypeBuilder(
+        :
+        // Coverage-ignore(suite): Not run.
+        new _InferredFunctionTypeBuilder(
             returnType,
             typeVariables,
             formals,
@@ -98,11 +100,13 @@
   String get debugName => "Function";
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isVoidType => false;
 
   @override
   StringBuffer printOn(StringBuffer buffer) {
     if (typeVariables != null) {
+      // Coverage-ignore-block(suite): Not run.
       buffer.write("<");
       bool isFirst = true;
       for (StructuralVariableBuilder t in typeVariables!) {
@@ -117,6 +121,7 @@
     }
     buffer.write("(");
     if (formals != null) {
+      // Coverage-ignore-block(suite): Not run.
       bool isFirst = true;
       for (ParameterBuilder t in formals!) {
         if (!isFirst) {
@@ -143,7 +148,9 @@
   @override
   DartType buildAliased(
       LibraryBuilder library, TypeUse typeUse, ClassHierarchyBase? hierarchy) {
-    assert(hierarchy != null || isExplicit, "Cannot build $this.");
+    assert(
+        hierarchy != null || isExplicit, // Coverage-ignore(suite): Not run.
+        "Cannot build $this.");
     DartType builtReturnType =
         returnType.buildAliased(library, TypeUse.returnType, hierarchy);
     List<DartType> positionalParameters = <DartType>[];
@@ -258,6 +265,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// A function type that needs type inference to be fully defined.
 ///
 /// This occurs through macros where return type or parameter types can be
diff --git a/pkg/front_end/lib/src/builder/future_or_type_declaration_builder.dart b/pkg/front_end/lib/src/builder/future_or_type_declaration_builder.dart
index 9111653..64892d5 100644
--- a/pkg/front_end/lib/src/builder/future_or_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/builder/future_or_type_declaration_builder.dart
@@ -12,6 +12,7 @@
 import 'nullability_builder.dart';
 import 'type_builder.dart';
 
+// Coverage-ignore(suite): Not run.
 class FutureOrTypeDeclarationBuilder extends BuiltinTypeDeclarationBuilder {
   FutureOrTypeDeclarationBuilder(
       DartType type, LibraryBuilder compilationUnit, int charOffset)
diff --git a/pkg/front_end/lib/src/builder/invalid_type_builder.dart b/pkg/front_end/lib/src/builder/invalid_type_builder.dart
index c80a069..11cd26a 100644
--- a/pkg/front_end/lib/src/builder/invalid_type_builder.dart
+++ b/pkg/front_end/lib/src/builder/invalid_type_builder.dart
@@ -36,16 +36,19 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Supertype? buildMixedInType(LibraryBuilder library) {
     return null;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Supertype? buildSupertype(LibraryBuilder library, TypeUse typeUse) {
     return null;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder clone(
       List<NamedTypeBuilder> newTypes,
       SourceLibraryBuilder contextLibrary,
@@ -60,19 +63,24 @@
   bool get isExplicit => true;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isVoidType => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeName? get typeName => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   NullabilityBuilder get nullabilityBuilder =>
       const NullabilityBuilder.inherent();
 
   @override
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) => buffer;
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder withNullabilityBuilder(NullabilityBuilder nullabilityBuilder) {
     return this;
   }
diff --git a/pkg/front_end/lib/src/builder/invalid_type_declaration_builder.dart b/pkg/front_end/lib/src/builder/invalid_type_declaration_builder.dart
index d112904..3583db3 100644
--- a/pkg/front_end/lib/src/builder/invalid_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/builder/invalid_type_declaration_builder.dart
@@ -21,6 +21,7 @@
       : super(null, 0, name, null, message.charOffset);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Uri? get fileUri => message.uri;
 
   @override
diff --git a/pkg/front_end/lib/src/builder/library_builder.dart b/pkg/front_end/lib/src/builder/library_builder.dart
index 1b98ac2..d6b884e 100644
--- a/pkg/front_end/lib/src/builder/library_builder.dart
+++ b/pkg/front_end/lib/src/builder/library_builder.dart
@@ -401,9 +401,11 @@
       : super(null, -1);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isSynthetic => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Builder? get parent => null;
 
   @override
@@ -416,6 +418,7 @@
   Loader get loader;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get modifiers => 0;
 
   @override
@@ -491,6 +494,7 @@
     Builder? cls = (bypassLibraryPrivacy ? scope : exportScope)
         .lookup(className, -1, fileUri);
     if (cls is TypeAliasBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       TypeAliasBuilder aliasBuilder = cls;
       // No type arguments are available, but this method is only called in
       // order to find constructors of specific non-generic classes (errors),
@@ -508,10 +512,13 @@
         if (!cls.isAbstract) {
           return constructor;
         }
-      } else if (constructor.isFactory) {
+      }
+      // Coverage-ignore(suite): Not run.
+      else if (constructor.isFactory) {
         return constructor;
       }
     }
+    // Coverage-ignore-block(suite): Not run.
     throw internalProblem(
         templateInternalProblemConstructorNotFound.withArguments(
             "$className.$constructorName", importUri),
@@ -537,6 +544,7 @@
       CompilationUnit accessor, int charOffset, int length, Uri fileUri) {}
 
   @override
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) {
     return buffer..write(isPart || isAugmenting ? fileUri : importUri);
   }
diff --git a/pkg/front_end/lib/src/builder/member_builder.dart b/pkg/front_end/lib/src/builder/member_builder.dart
index d30fe44..c4f14e7 100644
--- a/pkg/front_end/lib/src/builder/member_builder.dart
+++ b/pkg/front_end/lib/src/builder/member_builder.dart
@@ -251,6 +251,7 @@
   bool get isProperty => memberKind != ClassMemberKind.Method;
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get declarations =>
       throw new UnsupportedError("$runtimeType.declarations");
 
diff --git a/pkg/front_end/lib/src/builder/metadata_builder.dart b/pkg/front_end/lib/src/builder/metadata_builder.dart
index 3994457..aef335d 100644
--- a/pkg/front_end/lib/src/builder/metadata_builder.dart
+++ b/pkg/front_end/lib/src/builder/metadata_builder.dart
@@ -32,6 +32,7 @@
       : charOffset = _beginToken.charOffset,
         hasPatch = _beginToken.next?.lexeme == 'patch';
 
+  // Coverage-ignore(suite): Not run.
   Token? get beginToken => _beginToken;
 
   static void buildAnnotations(
@@ -94,6 +95,7 @@
         cloner ??= new CloneVisitorNotMembers();
         Expression annotation =
             cloner.cloneInContext(annotationBuilder._expression!);
+        // Coverage-ignore(suite): Not run.
         if (createFileUriExpression && annotation is! FileUriExpression) {
           annotation = new FileUriExpression(annotation, fileUri)
             ..fileOffset = annotationBuilder.charOffset;
diff --git a/pkg/front_end/lib/src/builder/modifier_builder.dart b/pkg/front_end/lib/src/builder/modifier_builder.dart
index 10207d7..0e0bb45 100644
--- a/pkg/front_end/lib/src/builder/modifier_builder.dart
+++ b/pkg/front_end/lib/src/builder/modifier_builder.dart
@@ -34,6 +34,7 @@
   @override
   bool get isAugment => (modifiers & augmentMask) != 0;
 
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) {
     return buffer..write(name);
   }
diff --git a/pkg/front_end/lib/src/builder/named_type_builder.dart b/pkg/front_end/lib/src/builder/named_type_builder.dart
index 59a7de5..4461f4f 100644
--- a/pkg/front_end/lib/src/builder/named_type_builder.dart
+++ b/pkg/front_end/lib/src/builder/named_type_builder.dart
@@ -136,7 +136,9 @@
             fileUri: fileUri,
             charOffset: charOffset,
             instanceTypeVariableAccess: instanceTypeVariableAccess)
-        : new _InferredNamedTypeBuilder(name, nullabilityBuilder,
+        :
+        // Coverage-ignore(suite): Not run.
+        new _InferredNamedTypeBuilder(name, nullabilityBuilder,
             arguments: arguments,
             fileUri: fileUri,
             charOffset: charOffset,
@@ -293,6 +295,7 @@
                 message.withLocation(fileUri!, nameOffset, nameLength));
             return;
           case InstanceTypeVariableAccessState.Unexpected:
+            // Coverage-ignore(suite): Not run.
             assert(false,
                 "Unexpected instance type variable $typeParameterBuilder");
             break;
@@ -315,6 +318,7 @@
       bool first = true;
       for (TypeBuilder t in typeArguments) {
         if (!first) {
+          // Coverage-ignore-block(suite): Not run.
           buffer.write(", ");
         }
         first = false;
@@ -352,6 +356,7 @@
 
     Message message;
     if (declaration!.isTypeVariable) {
+      // Coverage-ignore-block(suite): Not run.
       message =
           templateSupertypeIsTypeVariable.withArguments(fullNameForErrors);
     } else if (type.nullability == Nullability.nullable) {
@@ -376,31 +381,36 @@
               messageExtendsDeferredClass,
               typeName.fullNameOffset,
               typeName.fullNameLength,
-              fileUri ?? libraryBuilder.fileUri);
+              fileUri ?? // Coverage-ignore(suite): Not run.
+                  libraryBuilder.fileUri);
         case TypeUse.classImplementsType:
           libraryBuilder.addProblem(
               messageClassImplementsDeferredClass,
               typeName.fullNameOffset,
               typeName.fullNameLength,
-              fileUri ?? libraryBuilder.fileUri);
+              fileUri ?? // Coverage-ignore(suite): Not run.
+                  libraryBuilder.fileUri);
         case TypeUse.mixinOnType:
           libraryBuilder.addProblem(
               messageMixinSuperClassConstraintDeferredClass,
               typeName.fullNameOffset,
               typeName.fullNameLength,
-              fileUri ?? libraryBuilder.fileUri);
+              fileUri ?? // Coverage-ignore(suite): Not run.
+                  libraryBuilder.fileUri);
         case TypeUse.extensionTypeImplementsType:
           libraryBuilder.addProblem(
               messageExtensionTypeImplementsDeferred,
               typeName.fullNameOffset,
               typeName.fullNameLength,
-              fileUri ?? libraryBuilder.fileUri);
+              fileUri ?? // Coverage-ignore(suite): Not run.
+                  libraryBuilder.fileUri);
         case TypeUse.classWithType:
           libraryBuilder.addProblem(
               messageMixinDeferredMixin,
               typeName.fullNameOffset,
               typeName.fullNameLength,
-              fileUri ?? libraryBuilder.fileUri);
+              fileUri ?? // Coverage-ignore(suite): Not run.
+                  libraryBuilder.fileUri);
         case TypeUse.literalTypeArgument:
         case TypeUse.variableType:
         case TypeUse.typeParameterBound:
@@ -419,13 +429,21 @@
         case TypeUse.typeLiteral:
         case TypeUse.extensionOnType:
         case TypeUse.extensionTypeRepresentationType:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.typeArgument:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.typedefAlias:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.instantiation:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.enumSelfType:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.macroTypeArgument:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.typeParameterDefaultType:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.defaultTypeAsTypeArgument:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.deferredTypeError:
       }
     }
@@ -438,7 +456,9 @@
     if (libraryBuilder is SourceLibraryBuilder) {
       _checkDeferred(libraryBuilder, typeUse);
       if (!isRecordAccessAllowed(libraryBuilder) &&
+          // Coverage-ignore(suite): Not run.
           isDartCoreRecord(aliasedType)) {
+        // Coverage-ignore-block(suite): Not run.
         libraryBuilder.reportFeatureNotEnabled(
             libraryBuilder.libraryFeatures.records,
             fileUri ?? libraryBuilder.fileUri,
@@ -454,7 +474,9 @@
       {Set<TypeAliasBuilder>? usedTypeAliasBuilders,
       List<TypeBuilder>? unboundTypes,
       List<StructuralVariableBuilder>? unboundTypeVariables}) {
-    assert(declaration != null, "Declaration has not been resolved on $this.");
+    assert(
+        declaration != null, // Coverage-ignore(suite): Not run.
+        "Declaration has not been resolved on $this.");
     if (declaration is TypeAliasBuilder) {
       return (declaration as TypeAliasBuilder).unalias(typeArguments,
           usedTypeAliasBuilders: usedTypeAliasBuilders,
@@ -467,11 +489,15 @@
   @override
   DartType buildAliased(
       LibraryBuilder library, TypeUse typeUse, ClassHierarchyBase? hierarchy) {
-    assert(hierarchy != null || isExplicit, "Cannot build $this.");
+    assert(
+        hierarchy != null || isExplicit, // Coverage-ignore(suite): Not run.
+        "Cannot build $this.");
     DartType builtType = _buildAliasedInternal(library, typeUse, hierarchy);
     if (library is SourceLibraryBuilder &&
         !isRecordAccessAllowed(library) &&
+        // Coverage-ignore(suite): Not run.
         isDartCoreRecord(builtType)) {
+      // Coverage-ignore-block(suite): Not run.
       library.reportFeatureNotEnabled(
           library.libraryFeatures.records,
           fileUri ?? library.fileUri,
@@ -484,7 +510,9 @@
 
   DartType _buildAliasedInternal(
       LibraryBuilder library, TypeUse typeUse, ClassHierarchyBase? hierarchy) {
-    assert(declaration != null, "Declaration has not been resolved on $this.");
+    assert(
+        declaration != null, // Coverage-ignore(suite): Not run.
+        "Declaration has not been resolved on $this.");
     return declaration!.buildAliasedType(
         library,
         nullabilityBuilder,
@@ -502,6 +530,7 @@
     switch (declaration) {
       case ClassBuilder():
         if (declaration.isNullClass) {
+          // Coverage-ignore-block(suite): Not run.
           if (!library.mayImplementRestrictedTypes) {
             library.addProblem(
                 templateExtendingRestricted.withArguments(declaration.name),
@@ -513,7 +542,9 @@
         DartType type = build(library, typeUse);
         if (type is InterfaceType) {
           return new Supertype(type.classNode, type.typeArguments);
-        } else if (type is FutureOrType) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (type is FutureOrType) {
           return new Supertype(declaration.cls, [type.typeArgument]);
         } else if (type is NullType) {
           return new Supertype(declaration.cls, []);
@@ -524,6 +555,7 @@
         if (type is InterfaceType && type.nullability != Nullability.nullable) {
           return new Supertype(type.classNode, type.typeArguments);
         } else if (type is NullType) {
+          // Coverage-ignore-block(suite): Not run.
           // Even though `Null` is disallowed as a supertype,
           // [ClassHierarchyBuilder] still expects it to be built to the
           // respective [InterfaceType] referencing the deprecated class.
@@ -544,6 +576,7 @@
           return new Supertype(
               (unaliasedDeclaration as ClassBuilder).cls, const <DartType>[]);
         } else if (type is FutureOrType) {
+          // Coverage-ignore-block(suite): Not run.
           // Even though `FutureOr` is disallowed as a supertype,
           // [ClassHierarchyBuilder] still expects it to be built to the
           // respective [InterfaceType] referencing the deprecated class. In
@@ -580,6 +613,7 @@
       case ExtensionTypeDeclarationBuilder():
       case ExtensionBuilder():
       case BuiltinTypeDeclarationBuilder():
+      // Coverage-ignore(suite): Not run.
       // TODO(johnniwinther): How should we handle this case?
       case OmittedTypeDeclarationBuilder():
     }
@@ -616,6 +650,7 @@
       case ExtensionBuilder():
       case ExtensionTypeDeclarationBuilder():
       case BuiltinTypeDeclarationBuilder():
+      // Coverage-ignore(suite): Not run.
       // TODO(johnniwinther): How should we handle this case?
       case OmittedTypeDeclarationBuilder():
     }
@@ -757,6 +792,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// A named type that needs type inference to be fully defined.
 ///
 /// This occurs through macros where type arguments can be defined in terms of
diff --git a/pkg/front_end/lib/src/builder/never_type_declaration_builder.dart b/pkg/front_end/lib/src/builder/never_type_declaration_builder.dart
index 2bbd6b3..4a2ebf7 100644
--- a/pkg/front_end/lib/src/builder/never_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/builder/never_type_declaration_builder.dart
@@ -38,6 +38,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType buildAliasedTypeWithBuiltArguments(
       LibraryBuilder library,
       Nullability nullability,
diff --git a/pkg/front_end/lib/src/builder/null_type_declaration_builder.dart b/pkg/front_end/lib/src/builder/null_type_declaration_builder.dart
index 9b266f8..e01ce13 100644
--- a/pkg/front_end/lib/src/builder/null_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/builder/null_type_declaration_builder.dart
@@ -22,6 +22,7 @@
   String get debugName => "NullTypeBuilder";
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType buildAliasedType(
       LibraryBuilder library,
       NullabilityBuilder nullabilityBuilder,
@@ -35,6 +36,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType buildAliasedTypeWithBuiltArguments(
       LibraryBuilder library,
       Nullability nullability,
diff --git a/pkg/front_end/lib/src/builder/omitted_type_builder.dart b/pkg/front_end/lib/src/builder/omitted_type_builder.dart
index 63795c1..c5ca674 100644
--- a/pkg/front_end/lib/src/builder/omitted_type_builder.dart
+++ b/pkg/front_end/lib/src/builder/omitted_type_builder.dart
@@ -26,6 +26,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int? get charOffset => null;
 
   @override
@@ -37,19 +38,24 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Uri? get fileUri => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isVoidType => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeName? get typeName => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   NullabilityBuilder get nullabilityBuilder =>
       const NullabilityBuilder.omitted();
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder withNullabilityBuilder(NullabilityBuilder nullabilityBuilder) {
     return this;
   }
@@ -85,12 +91,14 @@
   String get debugName => 'ImplicitTypeBuilder';
 
   @override
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) => buffer;
 
   @override
   bool get isExplicit => true;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasType => true;
 
   @override
@@ -121,6 +129,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType buildAliased(
       LibraryBuilder library, TypeUse typeUse, ClassHierarchyBase? hierarchy) {
     if (hierarchy != null) {
@@ -140,12 +149,14 @@
 
   Inferable? _inferable;
 
+  // Coverage-ignore(suite): Not run.
   Inferable? get inferable => _inferable;
 
   @override
   void registerInferable(Inferable inferable) {
     assert(
         _inferable == null,
+        // Coverage-ignore(suite): Not run.
         "Inferable $_inferable has already been register, "
         "trying to register $inferable.");
     _inferable = inferable;
@@ -164,7 +175,9 @@
       } else {
         registerInferredType(const DynamicType());
       }
-      assert(hasType, "No type computed for $this");
+      assert(
+          hasType, // Coverage-ignore(suite): Not run.
+          "No type computed for $this");
     }
     return type;
   }
@@ -173,6 +186,7 @@
   String get debugName => 'InferredTypeBuilder';
 
   @override
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) {
     buffer.write('(inferable=');
     buffer.write(inferable);
@@ -181,6 +195,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// A type defined in terms of another omitted type.
 ///
 /// This is used in macro generated code to create type annotations from
diff --git a/pkg/front_end/lib/src/builder/omitted_type_declaration_builder.dart b/pkg/front_end/lib/src/builder/omitted_type_declaration_builder.dart
index 0dbc280..a2fb618 100644
--- a/pkg/front_end/lib/src/builder/omitted_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/builder/omitted_type_declaration_builder.dart
@@ -4,6 +4,7 @@
 
 part of 'declaration_builders.dart';
 
+// Coverage-ignore(suite): Not run.
 /// [TypeDeclaration] wrapper for an [OmittedTypeBuilder].
 ///
 /// This is used in macro generated code to create type annotations from
diff --git a/pkg/front_end/lib/src/builder/prefix_builder.dart b/pkg/front_end/lib/src/builder/prefix_builder.dart
index 2ff8d71..a889b7e 100644
--- a/pkg/front_end/lib/src/builder/prefix_builder.dart
+++ b/pkg/front_end/lib/src/builder/prefix_builder.dart
@@ -62,6 +62,7 @@
         exportScope.lookupLocalMember(name, setter: member.isSetter);
     Builder result;
     if (existing != null) {
+      // Coverage-ignore-block(suite): Not run.
       result = parent.computeAmbiguousDeclaration(
           name, existing, member, charOffset,
           isExport: true);
@@ -75,5 +76,6 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullNameForErrors => name;
 }
diff --git a/pkg/front_end/lib/src/builder/record_type_builder.dart b/pkg/front_end/lib/src/builder/record_type_builder.dart
index 06f5a46..6cc1086 100644
--- a/pkg/front_end/lib/src/builder/record_type_builder.dart
+++ b/pkg/front_end/lib/src/builder/record_type_builder.dart
@@ -63,7 +63,9 @@
     return isExplicit
         ? new _ExplicitRecordTypeBuilder(
             positional, named, nullabilityBuilder, fileUri, charOffset)
-        : new _InferredRecordTypeBuilder(
+        :
+        // Coverage-ignore(suite): Not run.
+        new _InferredRecordTypeBuilder(
             positional, named, nullabilityBuilder, fileUri, charOffset);
   }
 
@@ -71,12 +73,14 @@
       this.nullabilityBuilder, this.fileUri, this.charOffset);
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeName? get typeName => null;
 
   @override
   String get debugName => "Record";
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isVoidType => false;
 
   @override
@@ -92,12 +96,14 @@
         }
         field.type.printOn(buffer);
         if (field.name != null) {
+          // Coverage-ignore-block(suite): Not run.
           buffer.write(" ");
           buffer.write(field.name);
         }
       }
     }
     if (namedFields != null) {
+      // Coverage-ignore-block(suite): Not run.
       if (!isFirst) {
         buffer.write(", ");
       }
@@ -131,7 +137,9 @@
   @override
   DartType buildAliased(
       LibraryBuilder library, TypeUse typeUse, ClassHierarchyBase? hierarchy) {
-    assert(hierarchy != null || isExplicit, "Cannot build $this.");
+    assert(
+        hierarchy != null || isExplicit, // Coverage-ignore(suite): Not run.
+        "Cannot build $this.");
     const List<String> forbiddenObjectMemberNames = [
       "noSuchMethod",
       "toString",
@@ -264,6 +272,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Supertype? buildSupertype(LibraryBuilder library, TypeUse typeUse) {
     library.addProblem(
         messageSupertypeIsFunction, charOffset, noLength, fileUri);
@@ -271,6 +280,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Supertype? buildMixedInType(LibraryBuilder library) {
     return buildSupertype(library, TypeUse.classWithType);
   }
@@ -290,6 +300,7 @@
     }
     List<RecordTypeFieldBuilder>? clonedNamed;
     if (namedFields != null) {
+      // Coverage-ignore-block(suite): Not run.
       clonedNamed = new List<RecordTypeFieldBuilder>.generate(
           namedFields!.length, (int i) {
         RecordTypeFieldBuilder entry = namedFields![i];
@@ -334,6 +345,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// A record type that needs type inference to be fully defined.
 ///
 /// This occurs through macros where field types can be defined in terms of
diff --git a/pkg/front_end/lib/src/builder/type_alias_builder.dart b/pkg/front_end/lib/src/builder/type_alias_builder.dart
index b70721f..ca201dd 100644
--- a/pkg/front_end/lib/src/builder/type_alias_builder.dart
+++ b/pkg/front_end/lib/src/builder/type_alias_builder.dart
@@ -4,6 +4,7 @@
 
 part of 'declaration_builders.dart';
 
+// Coverage-ignore(suite): Not run.
 abstract class TypeAliasBuilder implements TypeDeclarationBuilder {
   TypeBuilder get type;
 
@@ -227,6 +228,7 @@
         if (typeVariables != null) {
           if (typeArguments == null ||
               typeVariables.length != typeArguments.length) {
+            // Coverage-ignore-block(suite): Not run.
             typeArguments = <TypeBuilder>[
               for (NominalVariableBuilder typeVariable in typeVariables)
                 typeVariable.defaultType!
@@ -243,6 +245,7 @@
                   unboundTypeVariables: unboundTypeVariables);
         }
         _typeAliasesUsedInUnaliasing.addAll(usedTypeAliasBuilders);
+      // Coverage-ignore(suite): Not run.
       case ExtensionBuilder():
         unexpected(
             "type", "${rhsTypeDeclaration.runtimeType}", charOffset, fileUri);
@@ -349,6 +352,7 @@
         return _cachedUnaliasedDeclaration = this;
       }
       if (builders.contains(current)) {
+        // Coverage-ignore-block(suite): Not run.
         // Cyclic type alias.
         currentAliasBuilder.libraryBuilder.addProblem(
             templateCyclicTypedef.withArguments(this.name),
@@ -452,6 +456,7 @@
         }
         if ((currentAliasBuilder.typeVariables?.length ?? 0) !=
             currentTypeArguments.length) {
+          // Coverage-ignore-block(suite): Not run.
           if (previousAliasBuilder != null) {
             previousAliasBuilder.libraryBuilder.addProblem(
                 templateTypeArgumentMismatch.withArguments(
@@ -492,6 +497,7 @@
             }
             return declarationBuilder;
           }
+          // Coverage-ignore(suite): Not run.
           // This can be null, e.g, `substitutedBuilder is FunctionTypeBuilder`
           return substitutedBuilder.declaration;
         }
@@ -532,7 +538,9 @@
     while (currentDeclarationBuilder is TypeAliasBuilder) {
       TypeAliasBuilder currentAliasBuilder = currentDeclarationBuilder;
       TypeBuilder nextTypeBuilder = currentAliasBuilder.type;
-      assert(nextTypeBuilder is NamedTypeBuilder,
+      assert(
+          nextTypeBuilder is NamedTypeBuilder,
+          // Coverage-ignore(suite): Not run.
           "Expected NamedTypeBuilder, got '${nextTypeBuilder.runtimeType}'.");
       NamedTypeBuilder namedNextTypeBuilder =
           nextTypeBuilder as NamedTypeBuilder;
@@ -540,6 +548,7 @@
       int index = 0;
       if (currentTypeArguments == null || currentTypeArguments.isEmpty) {
         if (currentAliasBuilder.typeVariables != null) {
+          // Coverage-ignore-block(suite): Not run.
           List<TypeBuilder> defaultTypeArguments =
               new List<TypeBuilder>.generate(
                   currentAliasBuilder.typeVariables!.length, (int i) {
@@ -561,6 +570,7 @@
           namedNextTypeBuilder.declaration;
       TypeBuilder substitutedBuilder = nextTypeBuilder.subst(substitution);
       if (nextDeclarationBuilder is NominalVariableBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         // We have reached the end of the type alias chain which yields a
         // type argument, which may become a type alias, possibly with its
         // own similar chain.
diff --git a/pkg/front_end/lib/src/builder/type_builder.dart b/pkg/front_end/lib/src/builder/type_builder.dart
index 6f83aa4..6929f32 100644
--- a/pkg/front_end/lib/src/builder/type_builder.dart
+++ b/pkg/front_end/lib/src/builder/type_builder.dart
@@ -360,9 +360,13 @@
     TypeBuilder result = substitute(this, substitution,
         unboundTypes: unboundTypesInternal,
         unboundTypeVariables: unboundTypeVariablesInternal);
-    assert(unboundTypes != null || unboundTypesInternal.isEmpty,
+    assert(
+        unboundTypes != null || unboundTypesInternal.isEmpty,
+        // Coverage-ignore(suite): Not run.
         "Non-empty unbound types: $unboundTypesInternal.");
-    assert(unboundTypeVariables != null || unboundTypeVariablesInternal.isEmpty,
+    assert(
+        unboundTypeVariables != null || unboundTypeVariablesInternal.isEmpty,
+        // Coverage-ignore(suite): Not run.
         "Non-empty unbound type variables: $unboundTypeVariables.");
     return result;
   }
@@ -557,15 +561,19 @@
   int get nameOffset => TreeNode.noOffset;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get nameLength => noLength;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullName => name;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get fullNameOffset => nameOffset;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get fullNameLength => noLength;
 }
 
@@ -584,6 +592,7 @@
   SyntheticTypeName(this.name, this.nameOffset);
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get nameLength => noLength;
 
   @override
@@ -593,9 +602,11 @@
   String get fullName => name;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get fullNameOffset => nameOffset;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get fullNameLength => noLength;
 }
 
diff --git a/pkg/front_end/lib/src/builder/type_declaration_builder.dart b/pkg/front_end/lib/src/builder/type_declaration_builder.dart
index 3b2f3b0..ea9f0e7 100644
--- a/pkg/front_end/lib/src/builder/type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/builder/type_declaration_builder.dart
@@ -4,6 +4,7 @@
 
 part of 'declaration_builders.dart';
 
+// Coverage-ignore(suite): Not run.
 abstract class ITypeDeclarationBuilder implements Builder {
   String get name;
 
diff --git a/pkg/front_end/lib/src/builder/type_variable_builder.dart b/pkg/front_end/lib/src/builder/type_variable_builder.dart
index 67d9204..9694a88 100644
--- a/pkg/front_end/lib/src/builder/type_variable_builder.dart
+++ b/pkg/front_end/lib/src/builder/type_variable_builder.dart
@@ -51,6 +51,7 @@
   String get debugName => "TypeVariableBuilderBase";
 
   @override
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) {
     buffer.write(name);
     if (bound != null) {
@@ -64,6 +65,7 @@
   String toString() => "${printOn(new StringBuffer())}";
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeVariableBuilderBase get origin => actualOrigin ?? this;
 
   Variance get variance;
@@ -129,6 +131,7 @@
       {Map<TypeVariableBuilderBase, TypeVariableTraversalState>?
           typeVariablesTraversalState,
       Map<TypeVariableBuilderBase, TypeVariableBuilderBase>? cycleElements}) {
+    // Coverage-ignore(suite): Not run.
     typeVariablesTraversalState ??= {};
     cycleElements ??= {};
 
@@ -321,6 +324,7 @@
       int charOffset,
       {required bool hasExplicitTypeArguments}) {
     if (arguments != null) {
+      // Coverage-ignore-block(suite): Not run.
       int charOffset = -1; // TODO(ahe): Provide these.
       Uri? fileUri = null; // TODO(ahe): Provide these.
       library.addProblem(
@@ -343,6 +347,7 @@
       ClassHierarchyBase? hierarchy,
       {required bool hasExplicitTypeArguments}) {
     if (arguments != null) {
+      // Coverage-ignore-block(suite): Not run.
       library.addProblem(
           templateTypeArgumentsOnTypeVariable.withArguments(name),
           charOffset,
@@ -379,6 +384,7 @@
         library.registerPendingNullability(
             this.fileUri!, this.charOffset, type);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         library.addProblem(
             templateInternalProblemUnfinishedTypeVariable.withArguments(
                 name, library.importUri),
@@ -409,7 +415,8 @@
         const NullabilityBuilder.nullable(),
         /* arguments = */ null,
         TypeUse.typeParameterBound,
-        fileUri ?? missingUri,
+        fileUri ?? // Coverage-ignore(suite): Not run.
+            missingUri,
         charOffset,
         /* hierarchy = */ null,
         hasExplicitTypeArguments: false);
@@ -503,6 +510,7 @@
         case ExtensionBuilder():
         case BuiltinTypeDeclarationBuilder():
         case InvalidTypeDeclarationBuilder():
+        // Coverage-ignore(suite): Not run.
         // TODO(johnniwinther): How should we handle this case?
         case OmittedTypeDeclarationBuilder():
         case null:
@@ -538,6 +546,7 @@
           internalDependents.add(field.type);
         }
       }
+    // Coverage-ignore(suite): Not run.
     case OmittedTypeBuilder():
     case FixedTypeBuilder():
     case InvalidTypeBuilder():
@@ -617,31 +626,38 @@
   Variance get variance => parameter.variance;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void set variance(Variance value) {
     parameter.variance = value;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasUnsetParameterBound =>
       identical(parameter.bound, StructuralParameter.unsetBoundSentinel);
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get parameterBound => parameter.bound;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void set parameterBound(DartType bound) {
     parameter.bound = bound;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Nullability get nullabilityFromParameterBound =>
       StructuralParameterType.computeNullabilityFromBound(parameter);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasUnsetParameterDefaultType => identical(
       parameter.defaultType, StructuralParameter.unsetDefaultTypeSentinel);
 
   @override
+  // Coverage-ignore(suite): Not run.
   void set parameterDefaultType(DartType defaultType) {
     parameter.defaultType = defaultType;
   }
@@ -655,6 +671,7 @@
   int get hashCode => parameter.hashCode;
 
   @override
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) {
     buffer.write(name);
     if (bound != null) {
@@ -684,6 +701,7 @@
       ClassHierarchyBase? hierarchy,
       {required bool hasExplicitTypeArguments}) {
     if (arguments != null) {
+      // Coverage-ignore-block(suite): Not run.
       library.addProblem(
           templateTypeArgumentsOnTypeVariable.withArguments(name),
           charOffset,
@@ -712,6 +730,7 @@
             StructuralParameterType.computeNullabilityFromBound(parameter);
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       nullability = nullabilityBuilder.build();
     }
     StructuralParameterType type = buildAliasedTypeWithBuiltArguments(
@@ -722,6 +741,7 @@
         library.registerPendingFunctionTypeNullability(
             this.fileUri!, this.charOffset, type);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         library.addProblem(
             templateInternalProblemUnfinishedTypeVariable.withArguments(
                 name, library.importUri),
@@ -743,6 +763,7 @@
       int charOffset,
       {required bool hasExplicitTypeArguments}) {
     if (arguments != null) {
+      // Coverage-ignore-block(suite): Not run.
       int charOffset = -1; // TODO(ahe): Provide these.
       Uri? fileUri = null; // TODO(ahe): Provide these.
       library.addProblem(
@@ -763,7 +784,8 @@
         const NullabilityBuilder.nullable(),
         /* arguments = */ null,
         TypeUse.typeParameterBound,
-        fileUri ?? missingUri,
+        fileUri ?? // Coverage-ignore(suite): Not run.
+            missingUri,
         charOffset,
         /* hierarchy = */ null,
         hasExplicitTypeArguments: false);
@@ -786,6 +808,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void applyAugmentation(covariant StructuralVariableBuilder augmentation) {
     augmentation.actualOrigin = this;
   }
diff --git a/pkg/front_end/lib/src/codes/type_labeler.dart b/pkg/front_end/lib/src/codes/type_labeler.dart
index 7341b23..f0204cb 100644
--- a/pkg/front_end/lib/src/codes/type_labeler.dart
+++ b/pkg/front_end/lib/src/codes/type_labeler.dart
@@ -159,7 +159,8 @@
 
   @override
   void visitStructuralParameterType(StructuralParameterType node) {
-    result.add(node.parameter.name ?? "T#${identityHashCode(node.parameter)}");
+    result.add(node.parameter.name ?? // Coverage-ignore(suite): Not run.
+        "T#${identityHashCode(node.parameter)}");
     addNullability(node.declaredNullability);
   }
 
@@ -203,6 +204,7 @@
           i < node.positionalParameters.length;
           i++) {
         if (!first) {
+          // Coverage-ignore-block(suite): Not run.
           result.add(", ");
         }
         node.positionalParameters[i].accept(this);
@@ -216,6 +218,7 @@
       first = true;
       for (int i = 0; i < node.namedParameters.length; i++) {
         if (!first) {
+          // Coverage-ignore-block(suite): Not run.
           result.add(", ");
         }
         node.namedParameters[i].type.accept(this);
@@ -330,6 +333,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitSymbolConstant(SymbolConstant node) {
     String text = node.libraryReference != null
         ? '#${node.libraryReference!.asLibrary.importUri}::${node.name}'
@@ -374,6 +378,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitSetConstant(SetConstant node) {
     result.add("<");
     node.typeArgument.accept(this);
@@ -397,6 +402,7 @@
     bool first = true;
     for (ConstantMapEntry entry in node.entries) {
       if (!first) {
+        // Coverage-ignore-block(suite): Not run.
         result.add(", ");
       }
       entry.key.accept(this);
@@ -460,6 +466,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitRedirectingFactoryTearOffConstant(
       RedirectingFactoryTearOffConstant node) {
     Member constructor = node.target;
@@ -489,6 +496,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitTypedefTearOffConstant(TypedefTearOffConstant node) {
     node.tearOffConstant.accept(this);
     if (node.parameters.isNotEmpty) {
@@ -583,7 +591,9 @@
     }
     Message message = (importUri == fileUri || importUri.isScheme('dart'))
         ? templateTypeOrigin.withArguments(toString(), importUri)
-        : templateTypeOriginWithFileUri.withArguments(
+        :
+        // Coverage-ignore(suite): Not run.
+        templateTypeOriginWithFileUri.withArguments(
             toString(), importUri, fileUri);
     return "\n - " + message.problemMessage;
   }
diff --git a/pkg/front_end/lib/src/compute_platform_binaries_location.dart b/pkg/front_end/lib/src/compute_platform_binaries_location.dart
index aedad6e..54cb712 100644
--- a/pkg/front_end/lib/src/compute_platform_binaries_location.dart
+++ b/pkg/front_end/lib/src/compute_platform_binaries_location.dart
@@ -25,6 +25,7 @@
           // DDC is always compiled against the outline so we use it here by
           // default.
           return 'ddc_outline.dill';
+        // Coverage-ignore(suite): Not run.
         //TODO(johnniwinther): Support using the full dill.
         //return 'ddc_platform.dill';
         case NnbdMode.Weak:
@@ -38,13 +39,16 @@
       switch (nnbdMode) {
         case NnbdMode.Strong:
           return 'dart2js_platform.dill';
+        // Coverage-ignore(suite): Not run.
         case NnbdMode.Weak:
           return 'dart2js_platform_unsound.dill';
       }
     case 'dart2js_server':
       switch (nnbdMode) {
+        // Coverage-ignore(suite): Not run.
         case NnbdMode.Strong:
           return 'dart2js_server_platform.dill';
+        // Coverage-ignore(suite): Not run.
         case NnbdMode.Weak:
           return 'dart2js_server_platform_unsound.dill';
       }
@@ -58,12 +62,14 @@
       switch (nnbdMode) {
         case NnbdMode.Strong:
           return 'dart2wasm_outline.dill';
+        // Coverage-ignore(suite): Not run.
         //TODO(johnniwinther): Support using the full dill.
         //return 'dart2wasm_platform.dill';
         case NnbdMode.Weak:
           break;
       }
       break;
+    // Coverage-ignore(suite): Not run.
     case 'wasm_js_compatibility':
       switch (nnbdMode) {
         case NnbdMode.Strong:
@@ -77,6 +83,7 @@
     default:
       break;
   }
+  // Coverage-ignore-block(suite): Not run.
   onError();
   return null;
 }
@@ -114,15 +121,19 @@
           ProcessedOptions options = context.options;
           sdkRoot = options.sdkRoot;
           if (sdkRoot == null) {
-            sdkRoot = options.librariesSpecificationUri?.resolve("../");
+            sdkRoot = options.librariesSpecificationUri
+                // Coverage-ignore(suite): Not run.
+                ?.resolve("../");
             if (sdkRoot != null) {
+              // Coverage-ignore-block(suite): Not run.
               if (!isExistingFile(sdkRoot.resolve("lib/libraries.json"))) {
                 sdkRoot = null;
               }
             }
           }
           if (sdkRoot == null) {
-            sdkRoot = (options.sdkSummary ?? computePlatformBinariesLocation())
+            sdkRoot = (options.sdkSummary ?? // Coverage-ignore(suite): Not run.
+                    computePlatformBinariesLocation())
                 .resolve("../../");
             if (!isExistingFile(sdkRoot.resolve("lib/libraries.json"))) {
               if (isExistingFile(sdkRoot.resolve("sdk/lib/libraries.json"))) {
@@ -132,6 +143,7 @@
               }
             }
           }
+          // Coverage-ignore(suite): Not run.
           sdkRoot ??= Uri.parse("org-dartlang-sdk:///sdk/");
           context.cachedSdkRoot = sdkRoot;
         }
@@ -140,6 +152,7 @@
           Map<Uri, Source> uriToSource = CompilerContext.current.uriToSource;
           Source source = uriToSource[uri]!;
           if (source.source.isEmpty) {
+            // Coverage-ignore-block(suite): Not run.
             uriToSource[uri] = new Source(
                 source.lineStarts,
                 new File.fromUri(candidate).readAsBytesSync(),
diff --git a/pkg/front_end/lib/src/dill/dill_class_builder.dart b/pkg/front_end/lib/src/dill/dill_class_builder.dart
index 428e9fef..c5483b0 100644
--- a/pkg/front_end/lib/src/dill/dill_class_builder.dart
+++ b/pkg/front_end/lib/src/dill/dill_class_builder.dart
@@ -25,6 +25,7 @@
   ConstructorScope get constructorScope;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterator<T> fullConstructorIterator<T extends MemberBuilder>() =>
       constructorScope.filteredIterator<T>(
           includeAugmentations: true, includeDuplicates: false);
@@ -40,6 +41,7 @@
           includeAugmentations: true, includeDuplicates: false);
 
   @override
+  // Coverage-ignore(suite): Not run.
   NameIterator<T> fullMemberNameIterator<T extends Builder>() =>
       scope.filteredNameIterator<T>(
           includeAugmentations: true, includeDuplicates: false);
@@ -129,6 +131,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<TypeBuilder>? get onTypes => null;
 
   void addField(Field field) {
@@ -154,6 +157,7 @@
     String name = procedure.name.text;
     switch (procedure.kind) {
       case ProcedureKind.Factory:
+        // Coverage-ignore(suite): Not run.
         throw new UnsupportedError("Use addFactory for adding factories");
       case ProcedureKind.Setter:
         scope.addLocalMember(name, new DillSetterBuilder(procedure, this),
@@ -204,6 +208,7 @@
   bool get isMixinApplication => cls.isMixinApplication;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get declaresConstConstructor => cls.hasConstConstructor;
 
   @override
@@ -212,6 +217,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void set mixedInTypeBuilder(TypeBuilder? mixin) {
     unimplemented("mixedInType=", -1, null);
   }
diff --git a/pkg/front_end/lib/src/dill/dill_extension_builder.dart b/pkg/front_end/lib/src/dill/dill_extension_builder.dart
index 9a867ba..6e7a056 100644
--- a/pkg/front_end/lib/src/dill/dill_extension_builder.dart
+++ b/pkg/front_end/lib/src/dill/dill_extension_builder.dart
@@ -48,7 +48,9 @@
           } else {
             Procedure procedure = descriptor.memberReference.asProcedure;
             Procedure? tearOff = descriptor.tearOffReference?.asProcedure;
-            assert(tearOff != null, "No tear found for ${descriptor}");
+            assert(
+                tearOff != null, // Coverage-ignore(suite): Not run.
+                "No tear found for ${descriptor}");
             scope.addLocalMember(
                 name.text,
                 new DillExtensionInstanceMethodBuilder(
@@ -94,11 +96,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder get onType {
     return _onType ??=
         libraryBuilder.loader.computeTypeBuilder(extension.onType);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<TypeParameter> get typeParameterNodes => extension.typeParameters;
 }
diff --git a/pkg/front_end/lib/src/dill/dill_extension_member_builder.dart b/pkg/front_end/lib/src/dill/dill_extension_member_builder.dart
index 8a09dc2..c96598b 100644
--- a/pkg/front_end/lib/src/dill/dill_extension_member_builder.dart
+++ b/pkg/front_end/lib/src/dill/dill_extension_member_builder.dart
@@ -17,9 +17,11 @@
   bool get isStatic => _descriptor.isStatic;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isExternal => member.isExternal;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name => _descriptor.name.text;
 
   @override
@@ -47,6 +49,7 @@
       : super(field, descriptor, parent);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get member => field;
 
   @override
@@ -56,6 +59,7 @@
   Member? get writeTarget => isAssignable ? field : null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get invokeTarget => field;
 
   @override
@@ -74,6 +78,7 @@
         super(procedure, descriptor, parent);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get member => procedure;
 
   @override
@@ -83,6 +88,7 @@
   Member get writeTarget => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get invokeTarget => null;
 }
 
@@ -95,12 +101,14 @@
         super(procedure, descriptor, parent);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get member => procedure;
 
   @override
   Member get readTarget => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -122,6 +130,7 @@
   Member? get readTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -138,15 +147,18 @@
         super(procedure, descriptor, parent);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get member => procedure;
 
   @override
   Member get readTarget => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get invokeTarget => procedure;
 }
 
@@ -165,15 +177,18 @@
         super(procedure, descriptor, parent);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get member => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Member> get exportedMembers => [procedure, _extensionTearOff];
 
   @override
   Member get readTarget => _extensionTearOff;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
diff --git a/pkg/front_end/lib/src/dill/dill_extension_type_declaration_builder.dart b/pkg/front_end/lib/src/dill/dill_extension_type_declaration_builder.dart
index 8645393..684a37a 100644
--- a/pkg/front_end/lib/src/dill/dill_extension_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/dill/dill_extension_type_declaration_builder.dart
@@ -48,10 +48,12 @@
       String name = procedure.name.text;
       switch (procedure.kind) {
         case ProcedureKind.Factory:
+          // Coverage-ignore(suite): Not run.
           throw new UnsupportedError(
               "Unexpected procedure kind in extension type declaration: "
               "$procedure (${procedure.kind}).");
         case ProcedureKind.Setter:
+          // Coverage-ignore(suite): Not run.
           scope.addLocalMember(name, new DillSetterBuilder(procedure, this),
               setter: true);
           break;
@@ -84,7 +86,9 @@
           } else {
             Procedure procedure = descriptor.memberReference.asProcedure;
             Procedure? tearOff = descriptor.tearOffReference?.asProcedure;
-            assert(tearOff != null, "No tear found for ${descriptor}");
+            assert(
+                tearOff != null, // Coverage-ignore(suite): Not run.
+                "No tear found for ${descriptor}");
             scope.addLocalMember(
                 name.text,
                 new DillExtensionTypeInstanceMethodBuilder(
diff --git a/pkg/front_end/lib/src/dill/dill_extension_type_member_builder.dart b/pkg/front_end/lib/src/dill/dill_extension_type_member_builder.dart
index 3d87c66..1289c88 100644
--- a/pkg/front_end/lib/src/dill/dill_extension_type_member_builder.dart
+++ b/pkg/front_end/lib/src/dill/dill_extension_type_member_builder.dart
@@ -19,6 +19,7 @@
   bool get isStatic => _descriptor.isStatic;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isExternal => member.isExternal;
 
   @override
@@ -36,8 +37,11 @@
       case ExtensionTypeMemberKind.Setter:
         return ProcedureKind.Setter;
       case ExtensionTypeMemberKind.Field:
+      // Coverage-ignore(suite): Not run.
       case ExtensionTypeMemberKind.Constructor:
+      // Coverage-ignore(suite): Not run.
       case ExtensionTypeMemberKind.Factory:
+      // Coverage-ignore(suite): Not run.
       case ExtensionTypeMemberKind.RedirectingFactory:
     }
     return null;
@@ -67,8 +71,10 @@
       case ExtensionTypeMemberKind.Operator:
       case ExtensionTypeMemberKind.Setter:
       case ExtensionTypeMemberKind.Field:
+      // Coverage-ignore(suite): Not run.
       case ExtensionTypeMemberKind.Constructor:
         return false;
+      // Coverage-ignore(suite): Not run.
       case ExtensionTypeMemberKind.Factory:
       case ExtensionTypeMemberKind.RedirectingFactory:
         return true;
@@ -96,6 +102,7 @@
   Member? get writeTarget => isAssignable ? field : null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get invokeTarget => field;
 
   @override
@@ -141,6 +148,7 @@
   Member get readTarget => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -162,6 +170,7 @@
   Member? get readTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -185,9 +194,11 @@
   Member get readTarget => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get invokeTarget => procedure;
 }
 
@@ -210,12 +221,14 @@
   Member get member => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Member> get exportedMembers => [procedure, _extensionTearOff];
 
   @override
   Member get readTarget => _extensionTearOff;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -241,9 +254,12 @@
   Procedure get member => constructor;
 
   @override
-  Member get readTarget => _constructorTearOff ?? constructor;
+  Member get readTarget =>
+      _constructorTearOff ?? // Coverage-ignore(suite): Not run.
+      constructor;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -262,9 +278,12 @@
   Member get member => _procedure;
 
   @override
-  Member? get readTarget => _factoryTearOff ?? _procedure;
+  Member? get readTarget =>
+      _factoryTearOff ?? // Coverage-ignore(suite): Not run.
+      _procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
diff --git a/pkg/front_end/lib/src/dill/dill_library_builder.dart b/pkg/front_end/lib/src/dill/dill_library_builder.dart
index 436a3b3..25bde44 100644
--- a/pkg/front_end/lib/src/dill/dill_library_builder.dart
+++ b/pkg/front_end/lib/src/dill/dill_library_builder.dart
@@ -67,6 +67,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void addProblem(Message message, int charOffset, int length, Uri? fileUri,
       {bool wasHandled = false,
       List<LocatedMessage>? context,
@@ -174,6 +175,7 @@
       throw new StateError("Not ready to build.");
     }
     if (isBuilt && !isBuiltAndMarked) {
+      // Coverage-ignore-block(suite): Not run.
       isBuiltAndMarked = true;
       finalizeExports();
       return;
@@ -223,6 +225,7 @@
   Uri get fileUri => library.fileUri;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String? get name => library.name;
 
   @override
@@ -299,6 +302,7 @@
         StringConstant string = constantExpression.constant as StringConstant;
         stringValue = string.value;
       } else {
+        // Coverage-ignore-block(suite): Not run.
         StringLiteral string = field.initializer as StringLiteral;
         stringValue = string.value;
       }
@@ -317,11 +321,13 @@
             _addBuilder(name, new DillGetterBuilder(member, this));
             break;
           case ProcedureKind.Operator:
+            // Coverage-ignore(suite): Not run.
             _addBuilder(name, new DillOperatorBuilder(member, this));
             break;
           case ProcedureKind.Method:
             _addBuilder(name, new DillMethodBuilder(member, this));
             break;
+          // Coverage-ignore(suite): Not run.
           case ProcedureKind.Factory:
             throw new UnsupportedError(
                 "Unexpected library procedure ${member.kind} for ${member}");
@@ -362,6 +368,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Builder computeAmbiguousDeclaration(
       String name, Builder builder, Builder other, int charOffset,
       {bool isExport = false, bool isImport = false}) {
@@ -379,6 +386,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullNameForErrors {
     return library.name ?? "<library '${library.fileUri}'>";
   }
@@ -397,11 +405,14 @@
       Builder declaration;
       if (messageText == exportDynamicSentinel) {
         assert(
-            name == 'dynamic', "Unexpected export name for 'dynamic': '$name'");
+            name == 'dynamic', // Coverage-ignore(suite): Not run.
+            "Unexpected export name for 'dynamic': '$name'");
         declaration = loader.coreLibrary.exportScope
             .lookupLocalMember(name, setter: false)!;
       } else if (messageText == exportNeverSentinel) {
-        assert(name == 'Never', "Unexpected export name for 'Never': '$name'");
+        assert(
+            name == 'Never', // Coverage-ignore(suite): Not run.
+            "Unexpected export name for 'Never': '$name'");
         declaration = loader.coreLibrary.exportScope
             .lookupLocalMember(name, setter: false)!;
       } else {
@@ -422,6 +433,7 @@
       Builder declaration;
       String name;
       if (sourceBuildersMap?.containsKey(reference) == true) {
+        // Coverage-ignore-block(suite): Not run.
         declaration = sourceBuildersMap![reference]!;
         if (declaration is TypeDeclarationBuilder) {
           name = declaration.name;
@@ -492,18 +504,21 @@
                   node == declaration.extension) ||
               (declaration is ExtensionTypeDeclarationBuilder &&
                   node == declaration.extensionTypeDeclaration),
+          // Coverage-ignore(suite): Not run.
           "Unexpected declaration ${declaration} (${declaration.runtimeType}) "
           "for node ${node} (${node.runtimeType}).");
     }
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterator<T> fullMemberIterator<T extends Builder>() {
     return scope.filteredIterator<T>(
         includeDuplicates: false, includeAugmentations: false);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   NameIterator<T> fullMemberNameIterator<T extends Builder>() {
     return scope.filteredNameIterator(
         includeDuplicates: false, includeAugmentations: false);
diff --git a/pkg/front_end/lib/src/dill/dill_loader.dart b/pkg/front_end/lib/src/dill/dill_loader.dart
index 83d5319..7e27bbe 100644
--- a/pkg/front_end/lib/src/dill/dill_loader.dart
+++ b/pkg/front_end/lib/src/dill/dill_loader.dart
@@ -106,7 +106,9 @@
     DillLibraryBuilder? libraryBuilder = _builders[uri];
     if (libraryBuilder == null) {
       libraryBuilder = _knownLibraryBuilders.remove(uri);
-      assert(libraryBuilder != null, "No library found for $uri.");
+      assert(
+          libraryBuilder != null, // Coverage-ignore(suite): Not run.
+          "No library found for $uri.");
       _builders[uri] = libraryBuilder!;
       assert(libraryBuilder.loader == this);
       if (uri.isScheme("dart")) {
@@ -136,6 +138,7 @@
           !accessor.isPart &&
           !target.backendTarget
               .allowPlatformPrivateLibraryAccess(accessor.importUri, uri)) {
+        // Coverage-ignore-block(suite): Not run.
         accessor.addProblem(messagePlatformPrivateLibraryAccess, charOffset,
             noLength, accessor.fileUri);
       }
@@ -145,6 +148,7 @@
 
   void _ensureCoreLibrary() {
     if (_coreLibrary == null) {
+      // Coverage-ignore-block(suite): Not run.
       read(Uri.parse("dart:core"), 0, accessor: first);
       // TODO(askesc): When all backends support set literals, we no longer
       // need to index dart:collection, as it is only needed for desugaring of
@@ -164,7 +168,9 @@
   }
 
   void _logSummary(Template<SummaryTemplate> template) {
-    ticker.log((Duration elapsed, Duration sinceStart) {
+    ticker.log(
+        // Coverage-ignore(suite): Not run.
+        (Duration elapsed, Duration sinceStart) {
       int libraryCount = 0;
       for (DillLibraryBuilder library in libraryBuilders) {
         assert(library.loader == this);
@@ -237,14 +243,23 @@
     target.context.report(
         fileUri != null
             ? message.withLocation(fileUri, charOffset, length)
-            : message.withoutLocation(),
+            :
+            // Coverage-ignore(suite): Not run.
+            message.withoutLocation(),
         severity,
         context: context,
         involvedFiles: involvedFiles);
     if (severity == Severity.error) {
-      (wasHandled ? handledErrors : unhandledErrors).add(fileUri != null
-          ? message.withLocation(fileUri, charOffset, length)
-          : message.withoutLocation());
+      (wasHandled
+              ?
+              // Coverage-ignore(suite): Not run.
+              handledErrors
+              : unhandledErrors)
+          .add(fileUri != null
+              ? message.withLocation(fileUri, charOffset, length)
+              :
+              // Coverage-ignore(suite): Not run.
+              message.withoutLocation());
     }
     FormattedMessage formattedMessage = target.createFormattedMessage(
         message, charOffset, length, fileUri, context, severity,
@@ -264,7 +279,9 @@
     for (int i = 0; i < componentLibraries.length; i++) {
       Library library = componentLibraries[i];
       Uri uri = library.importUri;
-      if (filter == null || filter(library.importUri)) {
+      if (filter == null ||
+          // Coverage-ignore(suite): Not run.
+          filter(library.importUri)) {
         libraries.add(library);
         registerKnownLibrary(library);
         requestedLibraries.add(uri);
@@ -340,6 +357,7 @@
     return _typeBuilderComputer.visit(type);
   }
 
+  // Coverage-ignore(suite): Not run.
   bool containsLibraryBuilder(Uri importUri) =>
       _builders.containsKey(importUri);
 
@@ -348,8 +366,10 @@
 
   Iterable<DillLibraryBuilder> get libraryBuilders => _builders.values;
 
+  // Coverage-ignore(suite): Not run.
   Iterable<Uri> get libraryImportUris => _builders.keys;
 
+  // Coverage-ignore(suite): Not run.
   void registerLibraryBuilder(DillLibraryBuilder libraryBuilder) {
     Uri importUri = libraryBuilder.importUri;
     libraryBuilder.loader = this;
diff --git a/pkg/front_end/lib/src/dill/dill_member_builder.dart b/pkg/front_end/lib/src/dill/dill_member_builder.dart
index 7fff872..9ce1782 100644
--- a/pkg/front_end/lib/src/dill/dill_member_builder.dart
+++ b/pkg/front_end/lib/src/dill/dill_member_builder.dart
@@ -57,7 +57,11 @@
   @override
   ProcedureKind? get kind {
     final Member member = this.member;
-    return member is Procedure ? member.kind : null;
+    return member is Procedure
+        ?
+        // Coverage-ignore(suite): Not run.
+        member.kind
+        : null;
   }
 
   @override
@@ -82,6 +86,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isAssignable => false;
 
   List<ClassMember>? _localMembers;
@@ -105,6 +110,7 @@
           : const <ClassMember>[];
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Annotatable> get annotatables => [member];
 }
 
@@ -124,6 +130,7 @@
   Member? get writeTarget => isAssignable ? field : null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get invokeTarget => field;
 
   @override
@@ -160,9 +167,11 @@
   Member get readTarget => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get invokeTarget => procedure;
 }
 
@@ -175,12 +184,14 @@
   Member get member => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get readTarget => null;
 
   @override
   Member get writeTarget => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get invokeTarget => null;
 }
 
@@ -196,9 +207,11 @@
   Member get readTarget => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get invokeTarget => procedure;
 }
 
@@ -211,12 +224,15 @@
   Member get member => procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get readTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member get invokeTarget => procedure;
 }
 
@@ -233,6 +249,7 @@
   Member? get readTarget => _factoryTearOff ?? procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -258,6 +275,7 @@
   Member get readTarget => _constructorTearOff ?? constructor;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -319,11 +337,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void inferType(ClassMembersBuilder hierarchy) {
     // Do nothing; this is only for source members.
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void registerOverrideDependency(Set<ClassMember> overriddenMembers) {
     // Do nothing; this is only for source members.
   }
@@ -363,6 +383,7 @@
   } else if (member is Constructor) {
     modifier |= member.isConst ? constMask : 0;
   } else {
+    // Coverage-ignore-block(suite): Not run.
     dynamic parent = member.parent;
     unhandled("${member.runtimeType}", "computeModifiers", member.fileOffset,
         Uri.base.resolve(parent.fileUri));
diff --git a/pkg/front_end/lib/src/dill/dill_target.dart b/pkg/front_end/lib/src/dill/dill_target.dart
index c1c14b3..527430a 100644
--- a/pkg/front_end/lib/src/dill/dill_target.dart
+++ b/pkg/front_end/lib/src/dill/dill_target.dart
@@ -43,6 +43,7 @@
           accessor: loader.coreLibraryCompilationUnit);
     }
     if (context.compilingPlatform) {
+      // Coverage-ignore-block(suite): Not run.
       for (String uri in backendTarget.extraRequiredLibrariesPlatform) {
         loader.read(Uri.parse(uri), 0,
             accessor: loader.coreLibraryCompilationUnit);
@@ -62,7 +63,9 @@
     return processedOptions.format(
         fileUri != null
             ? message.withLocation(fileUri, charOffset, length)
-            : message.withoutLocation(),
+            :
+            // Coverage-ignore(suite): Not run.
+            message.withoutLocation(),
         severity,
         messageContext,
         involvedFiles: involvedFiles);
@@ -70,12 +73,18 @@
 
   void buildOutlines({bool suppressFinalizationErrors = false}) {
     if (loader.libraries.isNotEmpty) {
-      benchmarker?.enterPhase(BenchmarkPhases.dill_buildOutlines);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.dill_buildOutlines);
       loader.buildOutlines();
-      benchmarker?.enterPhase(BenchmarkPhases.dill_finalizeExports);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.dill_finalizeExports);
       loader.finalizeExports(
           suppressFinalizationErrors: suppressFinalizationErrors);
-      benchmarker?.enterPhase(BenchmarkPhases.unknownDillTarget);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.unknownDillTarget);
     }
     isLoaded = true;
   }
diff --git a/pkg/front_end/lib/src/dill/dill_type_alias_builder.dart b/pkg/front_end/lib/src/dill/dill_type_alias_builder.dart
index 5cacfc0..eef68e4 100644
--- a/pkg/front_end/lib/src/dill/dill_type_alias_builder.dart
+++ b/pkg/front_end/lib/src/dill/dill_type_alias_builder.dart
@@ -32,6 +32,7 @@
       : super(null, typedef.name, parent, typedef.fileOffset);
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<MetadataBuilder> get metadata {
     return unimplemented("metadata", -1, null);
   }
@@ -46,6 +47,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get fromDill => true;
 
   @override
diff --git a/pkg/front_end/lib/src/kernel/benchmarker.dart b/pkg/front_end/lib/src/kernel/benchmarker.dart
index 4352c4f..9af9d91 100644
--- a/pkg/front_end/lib/src/kernel/benchmarker.dart
+++ b/pkg/front_end/lib/src/kernel/benchmarker.dart
@@ -1,3 +1,4 @@
+// Coverage-ignore(suite): Not run.
 // Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
@@ -91,6 +92,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class PhaseTiming {
   final BenchmarkPhases phase;
   int _runtime = 0;
@@ -125,6 +127,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class SubdivideTiming {
   final BenchmarkSubdivides phase;
   int _runtime = 0;
diff --git a/pkg/front_end/lib/src/kernel/body_builder.dart b/pkg/front_end/lib/src/kernel/body_builder.dart
index 3399d8e..050609d 100644
--- a/pkg/front_end/lib/src/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/kernel/body_builder.dart
@@ -495,6 +495,7 @@
   LibraryFeatures get libraryFeatures => libraryBuilder.libraryFeatures;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isDartLibrary =>
       libraryBuilder.origin.importUri.isScheme("dart") ||
       uri.isScheme("org-dartlang-sdk");
@@ -547,6 +548,7 @@
     ]));
     assert(
         expectedScopeKinds == null || expectedScopeKinds.contains(scope.kind),
+        // Coverage-ignore(suite): Not run.
         "Expected the current scope to be one of the kinds "
         "${expectedScopeKinds.map((k) => "'${k}'").join(", ")}, "
         "but got '${scope.kind}'.");
@@ -772,7 +774,9 @@
       return forest.createConstantPattern(node.buildSimpleRead());
     } else if (node is Expression) {
       return forest.createConstantPattern(node);
-    } else if (node is ProblemBuilder) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (node is ProblemBuilder) {
       // ignore: unused_local_variable
       Expression expression =
           buildProblem(node.message, node.charOffset, noLength);
@@ -834,6 +838,7 @@
       switchScope!.unclaimedForwardDeclarations!
           .forEach((String name, JumpTarget declaration) {
         if (outerSwitchScope == null) {
+          // Coverage-ignore-block(suite): Not run.
           for (Statement statement in declaration.users) {
             statement.parent!.replaceChild(
                 statement,
@@ -860,6 +865,7 @@
           buildProblem(message, offset, name.length, context: context)
             ..parent = variable;
     } else {
+      // Coverage-ignore-block(suite): Not run.
       variable.initializer = wrapInLocatedProblem(
           variable.initializer!, message.withLocation(uri, offset, name.length),
           context: context)
@@ -965,6 +971,7 @@
       pop(); // Type arguments (ignored, already reported by parser).
       Object? expression = pop();
       if (expression is Identifier) {
+        // Coverage-ignore-block(suite): Not run.
         Identifier identifier = expression;
         expression = new UnresolvedNameGenerator(this, identifier.token,
             new Name(identifier.name, libraryBuilder.nameOrigin),
@@ -987,7 +994,9 @@
           // TODO(johnniwinther): Stop using the type of the generator here.
           // Ask a property instead.
           (expression is! ReadOnlyAccessGenerator ||
+              // Coverage-ignore(suite): Not run.
               expression is TypeUseGenerator ||
+              // Coverage-ignore(suite): Not run.
               expression is ParenthesizedExpressionGenerator)) {
         Expression value = toValue(expression);
         push(wrapInProblem(value, fasta.messageExpressionNotMetadata,
@@ -1153,6 +1162,7 @@
     if (hasDelayedActions) {
       assert(
           delayedActionPerformers != null,
+          // Coverage-ignore(suite): Not run.
           "Body builder has delayed actions that cannot be performed: "
           "${[
             ...delayedRedirectingFactoryInvocations,
@@ -1195,6 +1205,7 @@
           if (formal.isInitializingFormal) {
             List<Initializer> initializers;
             if (_context.isExternalConstructor) {
+              // Coverage-ignore-block(suite): Not run.
               initializers = <Initializer>[
                 buildInvalidInitializer(
                     buildProblem(
@@ -1280,6 +1291,7 @@
     } else if (node is Generator) {
       initializers = node.buildFieldInitializer(initializedFields);
     } else if (node is ConstructorInvocation) {
+      // Coverage-ignore-block(suite): Not run.
       initializers = <Initializer>[
         // TODO(jensj): Does this offset make sense?
         buildSuperInitializer(
@@ -1368,6 +1380,7 @@
         }
         if (inferInitializer) {
           if (!parameter.initializerWasInferred) {
+            // Coverage-ignore(suite): Not run.
             initializer ??= forest.createNullLiteral(
                 // TODO(ahe): Should store: originParameter.fileOffset
                 // https://github.com/dart-lang/sdk/issues/32289
@@ -1425,7 +1438,9 @@
           formals!.parameters!.length != 1 ||
           formals.parameters!.single.isOptionalPositional) {
         int charOffset = formals?.charOffset ??
+            // Coverage-ignore(suite): Not run.
             body?.fileOffset ??
+            // Coverage-ignore(suite): Not run.
             _context.memberCharOffset;
         if (body == null) {
           body = new EmptyStatement()..fileOffset = charOffset;
@@ -1536,6 +1551,7 @@
     Library ensureLibraryLoaded = member.enclosingLibrary;
     LibraryBuilder? builder = libraryBuilder.loader
             .lookupLoadedLibraryBuilder(ensureLibraryLoaded.importUri) ??
+        // Coverage-ignore(suite): Not run.
         libraryBuilder.loader.target.dillTarget.loader
             .lookupLibraryBuilder(ensureLibraryLoaded.importUri);
     if (builder is DillLibraryBuilder) {
@@ -1572,6 +1588,7 @@
           return sub.substituteType(nextTypeArguments[i]);
         }, growable: true);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         typeArguments = <DartType>[];
       }
       target = nextMember;
@@ -1680,7 +1697,9 @@
     ];
     typeAliasedConstructorInvocations.clear();
     for (TypeAliasedConstructorInvocation invocation in invocations) {
-      assert(invocation.hasBeenInferred || isOrphaned(invocation),
+      assert(
+          invocation.hasBeenInferred || isOrphaned(invocation),
+          // Coverage-ignore(suite): Not run.
           "Node $invocation has not been inferred.");
 
       Expression? replacement;
@@ -1720,7 +1739,9 @@
         typeAliasedFactoryInvocations.toList();
     typeAliasedFactoryInvocations.clear();
     for (TypeAliasedFactoryInvocation invocation in invocations) {
-      assert(invocation.hasBeenInferred || isOrphaned(invocation),
+      assert(
+          invocation.hasBeenInferred || isOrphaned(invocation),
+          // Coverage-ignore(suite): Not run.
           "Node $invocation has not been inferred.");
 
       Expression? replacement;
@@ -1769,6 +1790,7 @@
       _resolveRedirectingFactoryTargets(delayedRedirectingFactoryInvocations,
           allowFurtherDelays: allowFurtherDelays);
       if (delayedRedirectingFactoryInvocations.isNotEmpty) {
+        // Coverage-ignore-block(suite): Not run.
         for (StaticInvocation invocation
             in delayedRedirectingFactoryInvocations) {
           internalProblem(
@@ -1783,6 +1805,7 @@
       _unaliasTypeAliasedFactoryInvocations(
           delayedTypeAliasedFactoryInvocations);
       if (delayedTypeAliasedFactoryInvocations.isNotEmpty) {
+        // Coverage-ignore-block(suite): Not run.
         for (StaticInvocation invocation
             in delayedTypeAliasedFactoryInvocations) {
           internalProblem(
@@ -1797,6 +1820,7 @@
       _unaliasTypeAliasedConstructorInvocations(
           delayedTypeAliasedConstructorInvocations);
       if (delayedTypeAliasedConstructorInvocations.isNotEmpty) {
+        // Coverage-ignore-block(suite): Not run.
         for (ConstructorInvocation invocation
             in delayedTypeAliasedConstructorInvocations) {
           internalProblem(
@@ -1861,12 +1885,15 @@
         parent.addAnnotation(expression);
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       temporaryParent = new ListLiteral(expressions);
     }
     performBacklogComputations(allowFurtherDelays: false);
+    // Coverage-ignore(suite): Not run.
     return temporaryParent != null ? temporaryParent.expressions : expressions;
   }
 
+  // Coverage-ignore(suite): Not run.
   Expression parseSingleExpression(
       Parser parser, Token token, FunctionNode parameters) {
     assert(redirectingFactoryInvocations.isEmpty);
@@ -2084,6 +2111,7 @@
     } else if (formals != null) {
       for (FormalParameterBuilder formal in formals) {
         if (formal.isSuperInitializingFormal) {
+          // Coverage-ignore-block(suite): Not run.
           if (formal.isNamed) {
             NamedExpression superParameterAsArgument = new NamedExpression(
                 formal.name,
@@ -2458,6 +2486,7 @@
     debugEvent("ParenthesizedExpression");
     Expression value = popForValue();
     if (value is ShadowLargeIntLiteral) {
+      // Coverage-ignore-block(suite): Not run.
       // We need to know that the expression was parenthesized because we will
       // treat -n differently from -(n).  If the expression occurs in a double
       // context, -n is a double literal and -(n) is an application of unary- to
@@ -2696,6 +2725,7 @@
     Scope headScope = pop() as Scope;
     assert(
         headScope.classNameOrDebugName == "switch block",
+        // Coverage-ignore(suite): Not run.
         "Expected to have scope 'switch block', "
         "but got '${headScope.classNameOrDebugName}'.");
     if (value is Pattern) {
@@ -2932,6 +2962,7 @@
         push(forest.createOrPattern(token.charOffset, left, right,
             orPatternJointVariables: jointVariables));
         break;
+      // Coverage-ignore(suite): Not run.
       default:
         internalProblem(
             fasta.templateInternalProblemUnhandled
@@ -2980,6 +3011,7 @@
               token.charOffset,
               token.length));
         } else {
+          // Coverage-ignore-block(suite): Not run.
           push(buildProblem(fasta.templateInvalidOperator.withArguments(token),
               token.charOffset, token.length));
         }
@@ -3211,9 +3243,12 @@
       bool reportWarning = true,
       List<LocatedMessage>? context}) {
     Message message = isSuper
-        ? fasta.templateSuperclassHasNoMember.withArguments(name.text)
+        ?
+        // Coverage-ignore(suite): Not run.
+        fasta.templateSuperclassHasNoMember.withArguments(name.text)
         : fasta.templateMemberNotFound.withArguments(name.text);
     if (reportWarning) {
+      // Coverage-ignore-block(suite): Not run.
       addProblemErrorIfConst(message, charOffset, name.text.length,
           context: context);
     }
@@ -3228,6 +3263,7 @@
         ? fasta.templateSuperclassHasNoGetter.withArguments(name.text)
         : fasta.templateGetterNotFound.withArguments(name.text);
     if (reportWarning) {
+      // Coverage-ignore-block(suite): Not run.
       addProblemErrorIfConst(message, charOffset, name.text.length,
           context: context);
     }
@@ -3242,6 +3278,7 @@
         ? fasta.templateSuperclassHasNoSetter.withArguments(name.text)
         : fasta.templateSetterNotFound.withArguments(name.text);
     if (reportWarning) {
+      // Coverage-ignore-block(suite): Not run.
       addProblemErrorIfConst(message, charOffset, name.text.length,
           context: context);
     }
@@ -3268,6 +3305,7 @@
         ? fasta.templateSuperclassHasNoMethod.withArguments(name.text)
         : fasta.templateMethodNotFound.withArguments(name.text);
     if (reportWarning) {
+      // Coverage-ignore-block(suite): Not run.
       addProblemErrorIfConst(message, charOffset, length, context: context);
     }
     return message;
@@ -3275,7 +3313,9 @@
 
   Message warnUnresolvedConstructor(Name name, {bool isSuper = false}) {
     Message message = isSuper
-        ? fasta.templateSuperclassHasNoConstructor.withArguments(name.text)
+        ?
+        // Coverage-ignore(suite): Not run.
+        fasta.templateSuperclassHasNoConstructor.withArguments(name.text)
         : fasta.templateConstructorNotFound.withArguments(name.text);
     return message;
   }
@@ -3304,6 +3344,7 @@
       if (!context.inDeclaration &&
           constantContext != ConstantContext.none &&
           !context.allowedInConstantExpression) {
+        // Coverage-ignore-block(suite): Not run.
         addProblem(fasta.messageNotAConstantExpression, token.charOffset,
             token.length);
       }
@@ -3585,8 +3626,10 @@
     Object? node = pop();
     Object? qualifier = pop();
     if (qualifier is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(qualifier);
     } else if (node is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(node);
     } else {
       Identifier identifier = node as Identifier;
@@ -3618,6 +3661,7 @@
       List<Object>? parts = const FixedNullableList<Object>()
           .popNonNullable(stack, count, /* dummyValue = */ 0);
       if (parts == null) {
+        // Coverage-ignore-block(suite): Not run.
         push(new ParserRecovery(endToken.charOffset));
         return;
       }
@@ -3669,6 +3713,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleScript(Token token) {
     debugEvent("Script");
   }
@@ -3894,6 +3939,7 @@
   void pushNewLocalVariable(Expression? initializer, {Token? equalsToken}) {
     Object? node = pop();
     if (node is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(node);
       return;
     }
@@ -3951,6 +3997,7 @@
     debugEvent("NoFieldInitializer");
     constantContext = _context.constantContext;
     if (constantContext == ConstantContext.inferred) {
+      // Coverage-ignore-block(suite): Not run.
       // Creating a null value to prevent the Dart VM from crashing.
       push(forest.createNullLiteral(offsetForToken(token)));
     } else {
@@ -3965,6 +4012,7 @@
     debugEvent("InitializedIdentifier");
     Object? node = pop();
     if (node is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(node);
       return;
     }
@@ -4012,6 +4060,7 @@
       currentLocalVariableModifiers = pop() as int;
       List<Expression>? annotations = pop() as List<Expression>?;
       if (node is ParserRecovery) {
+        // Coverage-ignore-block(suite): Not run.
         push(node);
         return;
       }
@@ -4032,6 +4081,7 @@
       currentLocalVariableModifiers = pop() as int;
       List<Expression>? annotations = pop() as List<Expression>?;
       if (variables == null) {
+        // Coverage-ignore-block(suite): Not run.
         push(new ParserRecovery(offsetForToken(endToken)));
         return;
       }
@@ -4087,6 +4137,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleInvalidTopLevelBlock(Token token) {
     // TODO(danrubel): Consider improved recovery by adding this block
     // as part of a synthetic top level function.
@@ -4133,6 +4184,7 @@
 
   void exitLoopOrSwitch(Statement statement) {
     if (problemInLoopOrSwitch != null) {
+      // Coverage-ignore-block(suite): Not run.
       push(problemInLoopOrSwitch);
       problemInLoopOrSwitch = null;
     } else {
@@ -4157,6 +4209,7 @@
           new VariableDeclarationImpl.forEffect(variableOrExpression);
       return <VariableDeclaration>[variable];
     } else if (variableOrExpression is ExpressionStatement) {
+      // Coverage-ignore-block(suite): Not run.
       VariableDeclaration variable = new VariableDeclarationImpl.forEffect(
           variableOrExpression.expression);
       return <VariableDeclaration>[variable];
@@ -4164,14 +4217,17 @@
       return forest
           .variablesDeclarationExtractDeclarations(variableOrExpression);
     } else if (variableOrExpression is List<Object>) {
+      // Coverage-ignore-block(suite): Not run.
       List<VariableDeclaration> variables = <VariableDeclaration>[];
       for (Object v in variableOrExpression) {
         variables.addAll(_buildForLoopVariableDeclarations(v)!);
       }
       return variables;
     } else if (variableOrExpression is PatternVariableDeclaration) {
+      // Coverage-ignore-block(suite): Not run.
       return <VariableDeclaration>[];
     } else if (variableOrExpression is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       return <VariableDeclaration>[];
     } else if (variableOrExpression == null) {
       return <VariableDeclaration>[];
@@ -4487,6 +4543,7 @@
           <Statement>[variableOrExpression, ...intermediateVariables!, result]);
     }
     if (variableOrExpression is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       problemInLoopOrSwitch ??= buildProblemStatement(
           fasta.messageSyntheticToken, variableOrExpression.charOffset,
           suppressMessage: true);
@@ -4556,6 +4613,7 @@
     DartType typeArgument;
     if (typeArguments != null) {
       if (typeArguments.length > 1) {
+        // Coverage-ignore-block(suite): Not run.
         addProblem(
             fasta.messageListLiteralTooManyTypeArguments,
             offsetForToken(leftBracket),
@@ -4761,6 +4819,7 @@
     if (setOrMapEntries != null) {
       for (dynamic entry in setOrMapEntries) {
         if (entry is MapLiteralEntry) {
+          // Coverage-ignore-block(suite): Not run.
           // TODO(danrubel): report the error on the colon
           addProblem(fasta.templateExpectedButGot.withArguments(','),
               entry.fileOffset, 1);
@@ -5004,6 +5063,7 @@
       push(forest.createMapEntry(offsetForToken(colon), key, value));
     } else {
       if (!libraryFeatures.nullAwareElements.isEnabled) {
+        // Coverage-ignore-block(suite): Not run.
         addProblem(
             templateExperimentNotEnabledOffByDefault
                 .withArguments(ExperimentalFlag.nullAwareElements.name),
@@ -5036,6 +5096,7 @@
     if (identifierCount == 1) {
       Object? part = pop();
       if (part is ParserRecovery) {
+        // Coverage-ignore-block(suite): Not run.
         push(new ParserErrorGenerator(
             this, hashToken, fasta.messageSyntheticToken));
       } else {
@@ -5046,6 +5107,7 @@
       List<Identifier>? parts = const FixedNullableList<Identifier>()
           .popNonNullable(stack, identifierCount, dummyIdentifier);
       if (parts == null) {
+        // Coverage-ignore-block(suite): Not run.
         push(new ParserErrorGenerator(
             this, hashToken, fasta.messageSyntheticToken));
         return;
@@ -5173,6 +5235,7 @@
         if (existing == null) {
           scope.addLocalMember(name, builder, setter: false);
         } else {
+          // Coverage-ignore-block(suite): Not run.
           reportDuplicatedDeclaration(existing, name, builder.charOffset);
         }
       }
@@ -5195,6 +5258,7 @@
         if (existing == null) {
           scope.addLocalMember(name, builder, setter: false);
         } else {
+          // Coverage-ignore-block(suite): Not run.
           reportDuplicatedDeclaration(existing, name, builder.charOffset);
         }
       }
@@ -5263,7 +5327,9 @@
     push(new RecordTypeFieldBuilder(
         [],
         type is ParserRecovery
-            ? new InvalidTypeBuilderImpl(uri, type.charOffset)
+            ?
+            // Coverage-ignore(suite): Not run.
+            new InvalidTypeBuilderImpl(uri, type.charOffset)
             : type as TypeBuilder,
         fieldName,
         name is Identifier ? name.nameOffset : TreeNode.noOffset,
@@ -5318,6 +5384,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleVoidKeywordWithTypeArguments(Token token) {
     assert(checkState(token, <ValueKind>[
       /* arguments */ ValueKinds.TypeArgumentsOrNull,
@@ -5441,6 +5508,7 @@
     debugEvent("ThrowExpression");
     Expression expression = popForValue();
     if (constantContext != ConstantContext.none) {
+      // Coverage-ignore-block(suite): Not run.
       push(buildProblem(
           fasta.templateNotConstantExpression.withArguments('Throw'),
           throwToken.offset,
@@ -5991,7 +6059,10 @@
       suffix = suffixObject;
     } else {
       assert(
-          suffixObject == null || suffixObject is ParserRecovery,
+          suffixObject == null ||
+              // Coverage-ignore(suite): Not run.
+              suffixObject is ParserRecovery,
+          // Coverage-ignore(suite): Not run.
           "Unexpected qualified name suffix $suffixObject "
           "(${suffixObject.runtimeType})");
       // There was a `.` without a suffix.
@@ -6036,6 +6107,7 @@
     }
     String name;
     if (identifier != null && suffix != null) {
+      // Coverage-ignore-block(suite): Not run.
       name = "${identifier.name}.${suffix.name}";
     } else if (identifier != null) {
       name = identifier.name;
@@ -6125,6 +6197,7 @@
       if (isConstructorInvocation) {
         if (constantContext == ConstantContext.required &&
             constness == Constness.implicit) {
+          // Coverage-ignore-block(suite): Not run.
           addProblem(fasta.messageMissingExplicitConst, charOffset, charLength);
         }
         if (isConst && !procedure.isConst) {
@@ -6408,6 +6481,7 @@
     List<TypeBuilder>? typeArguments = pop() as List<TypeBuilder>?;
     if (inMetadata && typeArguments != null) {
       if (!libraryFeatures.genericMetadata.isEnabled) {
+        // Coverage-ignore-block(suite): Not run.
         handleRecoverableError(fasta.messageMetadataTypeArguments,
             nameLastToken.next!, nameLastToken.next!);
       }
@@ -6426,6 +6500,7 @@
           typeArguments, name, arguments, nameToken, nameLastToken, constness,
           inImplicitCreationContext: inImplicitCreationContext));
     } else if (type is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(new ParserErrorGenerator(
           this, nameToken, fasta.messageSyntheticToken));
     } else if (type is InvalidExpression) {
@@ -6523,6 +6598,7 @@
       TypeDeclarationBuilder? typeAliasBuilder,
       required UnresolvedKind unresolvedKind}) {
     if (arguments == null) {
+      // Coverage-ignore-block(suite): Not run.
       return buildProblem(fasta.messageMissingArgumentList,
           nameToken.charOffset, nameToken.length);
     }
@@ -6542,6 +6618,7 @@
       int numberOfTypeArguments = typeArguments?.length ?? 0;
       if (typeArguments != null &&
           numberOfTypeParameters != numberOfTypeArguments) {
+        // Coverage-ignore-block(suite): Not run.
         // TODO(eernst): Use position of type arguments, not nameToken.
         return evaluateArgumentsBefore(
             arguments,
@@ -6578,6 +6655,7 @@
                 target = null;
               } else if (constructorBuilder.isConstructor) {
                 if (typeDeclarationBuilder.isAbstract) {
+                  // Coverage-ignore-block(suite): Not run.
                   return evaluateArgumentsBefore(
                       arguments,
                       buildAbstractClassInstantiationError(
@@ -6614,9 +6692,11 @@
               if (constructorBuilder == null) {
                 // Not found. Reported below.
               } else if (constructorBuilder is AmbiguousMemberBuilder) {
+                // Coverage-ignore-block(suite): Not run.
                 message = constructorBuilder.message
                     .withLocation(uri, charOffset, noLength);
               } else if (constructorBuilder.isConstructor ||
+                  // Coverage-ignore(suite): Not run.
                   constructorBuilder.isFactory) {
                 Member target = constructorBuilder.invokeTarget!;
                 return buildStaticInvocation(target, arguments,
@@ -6630,12 +6710,14 @@
                   arguments: arguments,
                   message: message,
                   kind: UnresolvedKind.Constructor);
+            // Coverage-ignore(suite): Not run.
             case InvalidTypeDeclarationBuilder():
               LocatedMessage message = typeDeclarationBuilder.message;
               return evaluateArgumentsBefore(
                   arguments,
                   buildProblem(message.messageObject, nameToken.charOffset,
                       nameToken.lexeme.length));
+            // Coverage-ignore(suite): Not run.
             case TypeAliasBuilder():
             case NominalVariableBuilder():
             case StructuralVariableBuilder():
@@ -6658,6 +6740,7 @@
               List<TypeBuilder>? unaliasedTypeArgumentBuilders =
                   aliasBuilder.unaliasTypeArguments(const []);
               if (unaliasedTypeArgumentBuilders == null) {
+                // Coverage-ignore-block(suite): Not run.
                 // TODO(eernst): This is a wrong number of type arguments,
                 // occurring indirectly (in an alias of an alias, etc.).
                 return evaluateArgumentsBefore(
@@ -6677,11 +6760,17 @@
               assert(forest.argumentsTypeArguments(arguments).isEmpty);
               forest.argumentsSetTypeArguments(arguments, dartTypeArguments);
             case TypeAliasBuilder():
+            // Coverage-ignore(suite): Not run.
             case NominalVariableBuilder():
+            // Coverage-ignore(suite): Not run.
             case StructuralVariableBuilder():
+            // Coverage-ignore(suite): Not run.
             case ExtensionBuilder():
+            // Coverage-ignore(suite): Not run.
             case InvalidTypeDeclarationBuilder():
+            // Coverage-ignore(suite): Not run.
             case BuiltinTypeDeclarationBuilder():
+            // Coverage-ignore(suite): Not run.
             // TODO(johnniwinther): How should we handle this case?
             case OmittedTypeDeclarationBuilder():
             case null:
@@ -6712,6 +6801,7 @@
             int numberOfTypeParameters =
                 aliasBuilder.typeVariables?.length ?? 0;
             if (numberOfTypeParameters != typeArgumentBuilders.length) {
+              // Coverage-ignore-block(suite): Not run.
               // TODO(eernst): Use position of type arguments, not nameToken.
               return evaluateArgumentsBefore(
                   arguments,
@@ -6724,6 +6814,7 @@
             List<TypeBuilder>? unaliasedTypeArgumentBuilders =
                 aliasBuilder.unaliasTypeArguments(typeArgumentBuilders);
             if (unaliasedTypeArgumentBuilders == null) {
+              // Coverage-ignore-block(suite): Not run.
               // TODO(eernst): This is a wrong number of type arguments,
               // occurring indirectly (in an alias of an alias, etc.).
               return evaluateArgumentsBefore(
@@ -6760,6 +6851,7 @@
               forest.argumentsSetTypeArguments(arguments, []);
             } else {
               if (forest.argumentsTypeArguments(arguments).isEmpty) {
+                // Coverage-ignore-block(suite): Not run.
                 // No type arguments provided to unaliased class, use defaults.
                 List<DartType> result = new List<DartType>.generate(
                     typeVariables.length,
@@ -6776,7 +6868,9 @@
         case StructuralVariableBuilder():
         case ExtensionBuilder():
         case InvalidTypeDeclarationBuilder():
+        // Coverage-ignore(suite): Not run.
         case BuiltinTypeDeclarationBuilder():
+        // Coverage-ignore(suite): Not run.
         // TODO(johnniwinther): How should we handle this case?
         case OmittedTypeDeclarationBuilder():
         case null:
@@ -6843,6 +6937,7 @@
         if (constructorBuilder == null) {
           // Not found. Reported below.
         } else if (constructorBuilder is AmbiguousMemberBuilder) {
+          // Coverage-ignore-block(suite): Not run.
           message = constructorBuilder.message
               .withLocation(uri, charOffset, noLength);
         } else {
@@ -6869,6 +6964,7 @@
       case StructuralVariableBuilder():
       case ExtensionBuilder():
       case BuiltinTypeDeclarationBuilder():
+      // Coverage-ignore(suite): Not run.
       // TODO(johnniwinther): How should we handle this case?
       case OmittedTypeDeclarationBuilder():
       case null:
@@ -6888,6 +6984,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleConstFactory(Token constKeyword) {
     debugEvent("ConstFactory");
     if (!libraryFeatures.constFunctions.isEnabled) {
@@ -7087,7 +7184,9 @@
       } else {
         int offset = elseEntry is Expression
             ? elseEntry.fileOffset
-            : offsetForToken(ifToken);
+            :
+            // Coverage-ignore(suite): Not run.
+            offsetForToken(ifToken);
         node = new MapLiteralEntry(
             buildProblem(fasta.templateExpectedAfterButGot.withArguments(':'),
                 offset, 1),
@@ -7103,6 +7202,7 @@
             node = forest.createIfMapEntry(offsetForToken(ifToken),
                 condition.expression, thenMapEntry, elseEntry);
           } else {
+            // Coverage-ignore-block(suite): Not run.
             node = forest.createIfCaseMapEntry(offsetForToken(ifToken),
                 prelude: [],
                 expression: condition.expression,
@@ -7121,7 +7221,9 @@
       } else {
         int offset = thenEntry is Expression
             ? thenEntry.fileOffset
-            : offsetForToken(ifToken);
+            :
+            // Coverage-ignore(suite): Not run.
+            offsetForToken(ifToken);
         node = new MapLiteralEntry(
             buildProblem(fasta.templateExpectedAfterButGot.withArguments(':'),
                 offset, 1),
@@ -7153,6 +7255,7 @@
     // TODO(cstefantsova): Replace the following no-op with the node for
     // handling null-aware elements.
     if (!libraryFeatures.nullAwareElements.isEnabled) {
+      // Coverage-ignore-block(suite): Not run.
       addProblem(
           templateExperimentNotEnabledOffByDefault
               .withArguments(ExperimentalFlag.nullAwareElements.name),
@@ -7256,6 +7359,7 @@
     } else {
       assert(
           identifier is ParserRecovery,
+          // Coverage-ignore(suite): Not run.
           "Unexpected argument name: "
           "${identifier} (${identifier.runtimeType})");
       push(identifier);
@@ -7282,6 +7386,7 @@
     // scope?
     Builder? existing = scope.lookupLocalMember(name.name, setter: false);
     if (existing != null) {
+      // Coverage-ignore-block(suite): Not run.
       reportDuplicatedDeclaration(existing, name.name, name.nameOffset);
     }
     push(new FunctionDeclarationImpl(
@@ -7513,7 +7618,9 @@
       /* break target = */ ValueKinds.BreakTarget,
     ]));
     Condition condition = pop() as Condition;
-    assert(condition.patternGuard == null,
+    assert(
+        condition.patternGuard == null,
+        // Coverage-ignore(suite): Not run.
         "Unexpected pattern in do statement: ${condition.patternGuard}.");
     Expression expression = condition.expression;
     Statement body = popStatement();
@@ -7549,6 +7656,7 @@
     if (scope.parent != null) {
       enterLocalScope(scope.parent!);
     } else {
+      // Coverage-ignore-block(suite): Not run.
       createAndEnterLocalScope(
           debugName: 'forIn', kind: ScopeKind.statementLocalScope);
     }
@@ -7785,6 +7893,7 @@
     JumpTarget breakTarget = exitBreakTarget()!;
     List<BreakStatementImpl>? continueStatements;
     if (continueTarget.hasUsers) {
+      // Coverage-ignore-block(suite): Not run.
       LabeledStatement labeledStatement = forest.createLabeledStatement(body);
       continueStatements =
           continueTarget.resolveContinues(forest, labeledStatement);
@@ -7815,6 +7924,7 @@
     typeInferrer.assignedVariables
         .storeInfo(forInStatement, assignedVariablesNodeInfo);
     if (continueStatements != null) {
+      // Coverage-ignore-block(suite): Not run.
       for (BreakStatementImpl continueStatement in continueStatements) {
         continueStatement.targetStatement = forInStatement;
       }
@@ -7899,6 +8009,7 @@
       push(forest.createRethrowStatement(
           offsetForToken(rethrowToken), offsetForToken(endToken)));
     } else {
+      // Coverage-ignore-block(suite): Not run.
       push(new ExpressionStatement(buildProblem(fasta.messageRethrowNotCatch,
           offsetForToken(rethrowToken), lengthForToken(rethrowToken)))
         ..fileOffset = offsetForToken(rethrowToken));
@@ -7930,7 +8041,9 @@
     ]));
     Statement body = popStatement();
     Condition condition = pop() as Condition;
-    assert(condition.patternGuard == null,
+    assert(
+        condition.patternGuard == null,
+        // Coverage-ignore(suite): Not run.
         "Unexpected pattern in while statement: ${condition.patternGuard}.");
     Expression expression = condition.expression;
     JumpTarget continueTarget = exitContinueTarget()!;
@@ -8013,6 +8126,7 @@
         conditionLastToken = nextToken;
       }
       if (conditionLastToken.isEof) {
+        // Coverage-ignore-block(suite): Not run.
         endOffset = startOffset = -1;
       } else {
         endOffset = conditionLastToken.offset + conditionLastToken.length;
@@ -8125,6 +8239,7 @@
         if (scope.hasLocalLabel(labelName)) {
           // TODO(ahe): Should validate this is a goto target.
           if (!scope.claimLabel(labelName)) {
+            // Coverage-ignore-block(suite): Not run.
             addProblem(
                 fasta.templateDuplicateLabelInSwitchStatement
                     .withArguments(labelName),
@@ -8349,6 +8464,7 @@
     assert(
         scope.kind == ScopeKind.switchCase ||
             scope.kind == ScopeKind.jointVariables,
+        // Coverage-ignore(suite): Not run.
         "Expected the current scope to be of kind '${ScopeKind.switchCase}' "
         "or '${ScopeKind.jointVariables}', but got '${scope.kind}.");
     Map<String, List<int>>? usedNamesOffsets = scope.usedNames;
@@ -8504,7 +8620,9 @@
     exitSwitchScope();
     exitLocalScope();
     Condition condition = pop() as Condition;
-    assert(condition.patternGuard == null,
+    assert(
+        condition.patternGuard == null,
+        // Coverage-ignore(suite): Not run.
         "Unexpected pattern in switch statement: ${condition.patternGuard}.");
     Expression expression = condition.expression;
     Statement switchStatement;
@@ -8519,6 +8637,7 @@
         if (switchCase is PatternSwitchCase) {
           patternSwitchCase = switchCase;
         } else {
+          // Coverage-ignore-block(suite): Not run.
           List<PatternGuard> patterns = new List<PatternGuard>.generate(
               switchCase.expressions.length, (int index) {
             return forest.createPatternGuard(
@@ -8648,7 +8767,9 @@
 
     List<SwitchExpressionCase> cases = pop() as List<SwitchExpressionCase>;
     Condition condition = pop() as Condition;
-    assert(condition.patternGuard == null,
+    assert(
+        condition.patternGuard == null,
+        // Coverage-ignore(suite): Not run.
         "Unexpected pattern in switch expression: ${condition.patternGuard}.");
     Expression expression = condition.expression;
     push(forest.createSwitchExpression(
@@ -8735,12 +8856,14 @@
       push(problemInLoopOrSwitch = buildProblemStatement(
           fasta.messageBreakOutsideOfLoop, breakKeyword.charOffset));
     } else if (target == null || !target.isBreakTarget) {
+      // Coverage-ignore-block(suite): Not run.
       Token labelToken = breakKeyword.next!;
       push(problemInLoopOrSwitch = buildProblemStatement(
           fasta.templateInvalidBreakTarget.withArguments(name!),
           labelToken.charOffset,
           length: labelToken.length));
     } else if (target.functionNestingLevel != functionNestingLevel) {
+      // Coverage-ignore-block(suite): Not run.
       push(buildProblemTargetOutsideLocalFunction(name, breakKeyword));
     } else {
       Statement statement =
@@ -8750,6 +8873,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   Statement buildProblemTargetOutsideLocalFunction(
       String? name, Token keyword) {
     Statement problem;
@@ -8804,16 +8928,19 @@
       }
     }
     if (target == null) {
+      // Coverage-ignore-block(suite): Not run.
       push(problemInLoopOrSwitch = buildProblemStatement(
           fasta.messageContinueWithoutLabelInCase, continueKeyword.charOffset,
           length: continueKeyword.length));
     } else if (!target.isContinueTarget) {
+      // Coverage-ignore-block(suite): Not run.
       Token labelToken = continueKeyword.next!;
       push(problemInLoopOrSwitch = buildProblemStatement(
           fasta.templateInvalidContinueTarget.withArguments(name!),
           labelToken.charOffset,
           length: labelToken.length));
     } else if (target.functionNestingLevel != functionNestingLevel) {
+      // Coverage-ignore-block(suite): Not run.
       push(buildProblemTargetOutsideLocalFunction(name, continueKeyword));
     } else {
       Statement statement = forest.createContinueStatement(
@@ -8906,6 +9033,7 @@
     TypeVariableBuilderBase variable = typeVariables[index];
     variable.bound = bound;
     if (variance != null) {
+      // Coverage-ignore-block(suite): Not run.
       if (!libraryFeatures.variance.isEnabled) {
         reportVarianceModifierNotEnabled(variance);
       }
@@ -8938,7 +9066,11 @@
           libraryBuilder.loader.target.objectClassBuilder,
           libraryBuilder.loader.target.dynamicType);
     }
-    for (int i = 0; i < unboundTypeVariables.length; ++i) {
+    for (int i = 0;
+        i < unboundTypeVariables.length;
+        // Coverage-ignore(suite): Not run.
+        ++i) {
+      // Coverage-ignore-block(suite): Not run.
       unboundTypeVariables[i].finish(
           libraryBuilder,
           libraryBuilder.loader.target.objectClassBuilder,
@@ -8991,6 +9123,7 @@
           expression, message.withLocation(uri, fileOffset, length),
           context: context);
     } else {
+      // Coverage-ignore-block(suite): Not run.
       addProblem(message, fileOffset, length, context: context);
       return expression;
     }
@@ -9026,6 +9159,7 @@
         context: context, suppressMessage: suppressMessage));
   }
 
+  // Coverage-ignore(suite): Not run.
   Statement wrapInProblemStatement(Statement statement, Message message) {
     // TODO(askesc): Produce explicit error statement wrapping the original.
     // See [issue 29717](https://github.com/dart-lang/sdk/issues/29717)
@@ -9147,6 +9281,7 @@
           DartType fieldType = _context.substituteFieldType(builder.fieldType);
           if (!typeEnvironment.isSubtypeOf(
               formalType, fieldType, SubtypeCheckMode.withNullabilities)) {
+            // Coverage-ignore-block(suite): Not run.
             libraryBuilder.addProblem(
                 fasta.templateInitializingFormalTypeMismatch
                     .withArguments(name, formalType, builder.fieldType),
@@ -9230,12 +9365,14 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleSymbolVoid(Token token) {
     debugEvent("SymbolVoid");
     push(new SimpleIdentifier(token));
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleInvalidFunctionBody(Token token) {
     if (_context.isNativeMethod) {
       push(NullValues.FunctionBody);
@@ -9380,6 +9517,7 @@
     List<Expression> expressions =
         new List<Expression>.of(forest.argumentsPositional(arguments));
     for (NamedExpression named in forest.argumentsNamed(arguments)) {
+      // Coverage-ignore-block(suite): Not run.
       expressions.add(named.value);
     }
     for (Expression argument in expressions.reversed) {
@@ -9542,6 +9680,7 @@
       List<TypeBuilder>? unresolvedTypes, TypeUse typeUse,
       {required bool allowPotentiallyConstantType}) {
     if (unresolvedTypes == null) {
+      // Coverage-ignore-block(suite): Not run.
       return <DartType>[];
     }
     return new List<DartType>.generate(
@@ -9718,6 +9857,7 @@
       case '>=':
         kind = RelationalPatternKind.greaterThanEqual;
         break;
+      // Coverage-ignore(suite): Not run.
       default:
         internalProblem(
             fasta.templateInternalProblemUnhandled
@@ -9832,7 +9972,9 @@
     DartType? patternType = type?.build(libraryBuilder, TypeUse.variableType);
     // Note: if `default` appears in a switch expression, parser error recovery
     // treats it as a wildcard pattern.
-    assert(wildcard.lexeme == '_' || wildcard.lexeme == 'default');
+    assert(wildcard.lexeme == '_' ||
+        // Coverage-ignore(suite): Not run.
+        wildcard.lexeme == 'default');
     push(forest.createWildcardPattern(wildcard.charOffset, patternType));
   }
 
@@ -10040,12 +10182,15 @@
             JumpTargetKind.Continue, functionNestingLevel, fileUri, charOffset);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasUsers => breakTarget.hasUsers || continueTarget.hasUsers;
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<Statement> get users => unsupported("users", charOffset, fileUri);
 
   @override
+  // Coverage-ignore(suite): Not run.
   JumpTargetKind get kind => unsupported("kind", charOffset, fileUri);
 
   @override
@@ -10068,23 +10213,27 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void addGoto(Statement statement) {
     unsupported("addGoto", charOffset, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void resolveBreaks(
       Forest forest, LabeledStatement target, Statement targetStatement) {
     breakTarget.resolveBreaks(forest, target, targetStatement);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<BreakStatementImpl>? resolveContinues(
       Forest forest, LabeledStatement target) {
     return continueTarget.resolveContinues(forest, target);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void resolveGotos(Forest forest, SwitchCase target) {
     unsupported("resolveGotos", charOffset, fileUri);
   }
@@ -10213,7 +10362,11 @@
     return body;
   } else {
     return new Block(<Statement>[
-      if (statement is Block) ...statement.statements else statement,
+      if (statement is Block)
+        ...statement // Coverage-ignore(suite): Not run.
+            .statements
+      else
+        statement,
       body
     ])
       ..fileOffset = statement.fileOffset;
@@ -10238,6 +10391,7 @@
 /// )
 String debugName(String className, String name, [String? prefix]) {
   String result = name.isEmpty ? className : "$className.$name";
+  // Coverage-ignore(suite): Not run.
   return prefix == null ? result : "$prefix.$result";
 }
 
@@ -10245,10 +10399,13 @@
 // of objects can be anticipated and handle these directly.
 String getNodeName(Object node) {
   if (node is Identifier) {
+    // Coverage-ignore-block(suite): Not run.
     return node.name;
   } else if (node is Builder) {
     return node.fullNameForErrors;
-  } else if (node is QualifiedName) {
+  }
+  // Coverage-ignore(suite): Not run.
+  else if (node is QualifiedName) {
     return flattenName(node, node.charOffset, null);
   } else {
     return unhandled("${node.runtimeType}", "getNodeName", -1, null);
@@ -10292,7 +10449,9 @@
         ..hasBeenInferred = node.hasBeenInferred;
       bodyBuilder.redirectingFactoryInvocations.add(result);
       return result;
-    } else if (node is TypeAliasedFactoryInvocation) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (node is TypeAliasedFactoryInvocation) {
       TypeAliasedFactoryInvocation result = new TypeAliasedFactoryInvocation(
           node.typeAliasBuilder, node.target, clone(node.arguments),
           isConst: node.isConst)
@@ -10300,12 +10459,14 @@
       bodyBuilder.typeAliasedFactoryInvocations.add(result);
       return result;
     }
+    // Coverage-ignore(suite): Not run.
     return super.visitStaticInvocation(node);
   }
 
   @override
   TreeNode visitConstructorInvocation(ConstructorInvocation node) {
     if (node is TypeAliasedConstructorInvocation) {
+      // Coverage-ignore-block(suite): Not run.
       TypeAliasedConstructorInvocation result =
           new TypeAliasedConstructorInvocation(
               node.typeAliasBuilder, node.target, clone(node.arguments),
@@ -10323,6 +10484,7 @@
       return ArgumentsImpl.clone(node, node.positional.map(clone).toList(),
           node.named.map(clone).toList(), node.types.map(visitType).toList());
     }
+    // Coverage-ignore(suite): Not run.
     return super.visitArguments(node);
   }
 }
@@ -10344,11 +10506,13 @@
   if (member == null) {
     return true;
   }
+  // Coverage-ignore-block(suite): Not run.
   _FindChildVisitor visitor = new _FindChildVisitor(node);
   member.accept(visitor);
   return !visitor.foundNode;
 }
 
+// Coverage-ignore(suite): Not run.
 class _FindChildVisitor extends VisitorDefault<void> with VisitorVoidMixin {
   final TreeNode soughtNode;
   bool foundNode = false;
diff --git a/pkg/front_end/lib/src/kernel/body_builder_context.dart b/pkg/front_end/lib/src/kernel/body_builder_context.dart
index 9762d63..95db073 100644
--- a/pkg/front_end/lib/src/kernel/body_builder_context.dart
+++ b/pkg/front_end/lib/src/kernel/body_builder_context.dart
@@ -109,16 +109,22 @@
 
   bool get isConstructor => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isExternalConstructor => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isExternalFunction => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isSetter => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isConstConstructor => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isFactory => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isNativeMethod => false;
 
   bool get isDeclarationInstanceContext {
@@ -151,10 +157,13 @@
 
   ConstantContext get constantContext => ConstantContext.none;
 
+  // Coverage-ignore(suite): Not run.
   bool get isLateField => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isAbstractField => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isExternalField => false;
 
   bool get isMixinClass => _declarationContext.isMixinClass;
@@ -216,6 +225,7 @@
     throw new UnsupportedError("${runtimeType}.memberCharOffset");
   }
 
+  // Coverage-ignore(suite): Not run.
   AugmentSuperTarget? get augmentSuperTarget {
     return null;
   }
@@ -241,6 +251,7 @@
         return new _SourceClassBodyBuilderDeclarationContext(
             libraryBuilder, declarationBuilder);
       } else if (declarationBuilder is DillClassBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         return new _DillClassBodyBuilderDeclarationContext(
             libraryBuilder, declarationBuilder);
       } else if (declarationBuilder is SourceExtensionTypeDeclarationBuilder) {
@@ -286,6 +297,7 @@
 
   bool get isMixinClass => false;
 
+  // Coverage-ignore(suite): Not run.
   bool get isEnumClass => false;
 
   String get className {
@@ -304,6 +316,7 @@
 
   bool get declaresConstConstructor => false;
 
+  // Coverage-ignore(suite): Not run.
   bool isObjectClass(CoreTypes coreTypes) => false;
 }
 
@@ -415,6 +428,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _DillClassBodyBuilderDeclarationContext
     extends BodyBuilderDeclarationContext
     with _DeclarationBodyBuilderDeclarationContextMixin {
@@ -506,6 +520,7 @@
             inConstFields: inConstFields);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasFormalParameters => false;
 }
 
@@ -530,6 +545,7 @@
             inConstFields: inConstFields);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasFormalParameters => false;
 }
 
@@ -546,6 +562,7 @@
             inConstFields: inConstFields);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasFormalParameters => false;
 }
 
@@ -562,6 +579,7 @@
             inConstFields: inConstFields);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasFormalParameters => false;
 }
 
@@ -581,6 +599,7 @@
             inConstFields: inConstFields);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasFormalParameters => false;
 }
 
@@ -596,6 +615,7 @@
             inConstFields: inConstFields);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasFormalParameters => false;
 }
 
@@ -715,6 +735,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isNativeMethod {
     return _member.isNative;
   }
@@ -979,9 +1000,11 @@
             inConstFields: inConstFields);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasFormalParameters => false;
 }
 
+// Coverage-ignore(suite): Not run.
 class ExpressionCompilerProcedureBodyBuildContext extends BodyBuilderContext
     with _MemberBodyBuilderContext<SourceProcedureBuilder> {
   @override
diff --git a/pkg/front_end/lib/src/kernel/collections.dart b/pkg/front_end/lib/src/kernel/collections.dart
index a09b031..6df4385 100644
--- a/pkg/front_end/lib/src/kernel/collections.dart
+++ b/pkg/front_end/lib/src/kernel/collections.dart
@@ -24,19 +24,23 @@
   /// Spread and control-flow elements are not expressions and do not have a
   /// static type.
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getStaticType(StaticTypeContext context) {
     return unsupported("getStaticType", fileOffset, getFileUri(this));
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getStaticTypeInternal(StaticTypeContext context) {
     return unsupported("getStaticTypeInternal", fileOffset, getFileUri(this));
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept<R>(ExpressionVisitor<R> v) => v.visitAuxiliaryExpression(this);
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept1<R, A>(ExpressionVisitor1<R, A> v, A arg) =>
       v.visitAuxiliaryExpression(this, arg);
 
@@ -67,17 +71,20 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     expression.accept(v);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     expression = v.transform(expression);
     expression.parent = this;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     expression = v.transform(expression);
     expression.parent = this;
@@ -96,6 +103,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('...');
     if (isNullAware) {
@@ -118,6 +126,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     condition.accept(v);
     then.accept(v);
@@ -125,6 +134,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     condition = v.transform(condition);
     condition.parent = this;
@@ -137,6 +147,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     condition = v.transform(condition);
     condition.parent = this;
@@ -161,6 +172,7 @@
     MapLiteralEntry? otherwiseEntry;
     Expression? otherwise = this.otherwise;
     if (otherwise != null) {
+      // Coverage-ignore-block(suite): Not run.
       if (otherwise is ControlFlowElement) {
         ControlFlowElement otherwiseElement = otherwise;
         otherwiseEntry = otherwiseElement.toMapLiteralEntry(onConvertElement);
@@ -179,6 +191,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('if (');
     printer.writeExpression(condition);
@@ -206,6 +219,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     visitList(variables, v);
     condition?.accept(v);
@@ -214,6 +228,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     v.transformList(variables, this);
     if (condition != null) {
@@ -226,6 +241,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     v.transformVariableDeclarationList(variables, this);
     if (condition != null) {
@@ -260,6 +276,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('for (');
     for (int index = 0; index < variables.length; index++) {
@@ -298,7 +315,9 @@
     syntheticAssignment?.parent = this;
     expressionEffects?.parent = this;
     body.parent = this;
-    problem?.parent = this;
+    problem
+        // Coverage-ignore(suite): Not run.
+        ?.parent = this;
   }
 
   Statement? get prologue => syntheticAssignment != null
@@ -307,6 +326,7 @@
       : expressionEffects;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     variable.accept(v);
     iterable.accept(v);
@@ -317,6 +337,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     variable = v.transform(variable);
     variable.parent = this;
@@ -339,6 +360,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     variable = v.transform(variable);
     variable.parent = this;
@@ -383,6 +405,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter state) {
     // TODO(johnniwinther): Implement this.
   }
@@ -410,13 +433,16 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept<R>(TreeVisitor<R> v) => v.visitMapLiteralEntry(this);
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept1<R, A>(TreeVisitor1<R, A> v, A arg) =>
       v.visitMapLiteralEntry(this, arg);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String toStringInternal() => toText(defaultAstTextStrategy);
 }
 
@@ -436,17 +462,20 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     expression.accept(v);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     expression = v.transform(expression);
     expression.parent = this;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     expression = v.transform(expression);
     expression.parent = this;
@@ -458,6 +487,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('...');
     expression.toTextInternal(printer);
@@ -477,6 +507,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     condition.accept(v);
     then.accept(v);
@@ -484,6 +515,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     condition = v.transform(condition);
     condition.parent = this;
@@ -496,6 +528,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     condition = v.transform(condition);
     condition.parent = this;
@@ -513,6 +546,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('if (');
     condition.toTextInternal(printer);
@@ -540,6 +574,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     visitList(variables, v);
     condition?.accept(v);
@@ -548,6 +583,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     v.transformList(variables, this);
     if (condition != null) {
@@ -560,6 +596,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     v.transformVariableDeclarationList(variables, this);
     if (condition != null) {
@@ -577,6 +614,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('for (');
     for (int index = 0; index < variables.length; index++) {
@@ -615,7 +653,9 @@
     syntheticAssignment?.parent = this;
     expressionEffects?.parent = this;
     body.parent = this;
-    problem?.parent = this;
+    problem
+        // Coverage-ignore(suite): Not run.
+        ?.parent = this;
   }
 
   Statement? get prologue => syntheticAssignment != null
@@ -624,6 +664,7 @@
       : expressionEffects;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     variable.accept(v);
     iterable.accept(v);
@@ -634,6 +675,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     variable = v.transform(variable);
     variable.parent = this;
@@ -656,6 +698,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     variable = v.transform(variable);
     variable.parent = this;
@@ -683,6 +726,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter state) {
     // TODO(johnniwinther): Implement this.
   }
@@ -712,7 +756,9 @@
         convertToElement(entry.then, helper, onConvertMapEntry),
         entry.otherwise == null
             ? null
-            : convertToElement(entry.otherwise!, helper, onConvertMapEntry))
+            :
+            // Coverage-ignore(suite): Not run.
+            convertToElement(entry.otherwise!, helper, onConvertMapEntry))
       ..fileOffset = entry.fileOffset;
     onConvertMapEntry(entry, result);
     return result;
@@ -725,7 +771,9 @@
         then: convertToElement(entry.then, helper, onConvertMapEntry),
         otherwise: entry.otherwise == null
             ? null
-            : convertToElement(entry.otherwise!, helper, onConvertMapEntry))
+            :
+            // Coverage-ignore(suite): Not run.
+            convertToElement(entry.otherwise!, helper, onConvertMapEntry))
       ..matchedValueType = entry.matchedValueType
       ..fileOffset = entry.fileOffset;
     onConvertMapEntry(entry, result);
@@ -775,6 +823,7 @@
       return key;
     }
   }
+  // Coverage-ignore(suite): Not run.
   // TODO(johnniwinther): How can this be triggered? This will fail if
   // encountered in top level inference.
   return helper!.buildProblem(
@@ -794,12 +843,14 @@
   if (element is IfCaseElement) {
     return isConvertibleToMapEntry(element.then) &&
         (element.otherwise == null ||
+            // Coverage-ignore(suite): Not run.
             isConvertibleToMapEntry(element.otherwise!));
   }
   if (element is ForElement) {
     return isConvertibleToMapEntry(element.body);
   }
   if (element is PatternForElement) {
+    // Coverage-ignore-block(suite): Not run.
     return isConvertibleToMapEntry(element.body);
   }
   if (element is ForInElement) {
@@ -841,7 +892,9 @@
         then: convertToMapEntry(element.then, helper, onConvertElement),
         otherwise: element.otherwise == null
             ? null
-            : convertToMapEntry(element.otherwise!, helper, onConvertElement))
+            :
+            // Coverage-ignore(suite): Not run.
+            convertToMapEntry(element.otherwise!, helper, onConvertElement))
       ..matchedValueType = element.matchedValueType
       ..fileOffset = element.fileOffset;
     onConvertElement(element, result);
@@ -882,6 +935,7 @@
     onConvertElement(element, result);
     return result;
   }
+  // Coverage-ignore(suite): Not run.
   return new MapLiteralEntry(
       helper.buildProblem(
         templateExpectedAfterButGot.withArguments(':'),
diff --git a/pkg/front_end/lib/src/kernel/combined_member_signature.dart b/pkg/front_end/lib/src/kernel/combined_member_signature.dart
index eb3dc87..42292cf 100644
--- a/pkg/front_end/lib/src/kernel/combined_member_signature.dart
+++ b/pkg/front_end/lib/src/kernel/combined_member_signature.dart
@@ -202,7 +202,10 @@
   /// different type.
   bool get neededLegacyErasure {
     _ensureCombinedMemberSignatureType();
-    return _neededLegacyErasureIndices?.contains(canonicalMemberIndex) ?? false;
+    return _neededLegacyErasureIndices
+            // Coverage-ignore(suite): Not run.
+            ?.contains(canonicalMemberIndex) ??
+        false;
   }
 
   /// Returns `true` if nnbd top merge and normalization was needed to compute
@@ -261,6 +264,7 @@
                 norm(_coreTypes, getMemberType(index)));
             assert(
                 _combinedMemberSignatureType != null,
+                // Coverage-ignore(suite): Not run.
                 "No combined member signature found for "
                 "${_mutualSubtypes!.values.map((int i) => getMemberType(i))} "
                 "for members ${members}");
@@ -364,7 +368,9 @@
         }
       }
       return instantiator.substitute(type.withoutTypeParameters);
-    } else if (typeParameterCount != 0) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (typeParameterCount != 0) {
       return null;
     }
     return type;
@@ -412,6 +418,7 @@
               combinedMemberSignatureType as FunctionType,
               copyLocation: copyLocation);
           break;
+        // Coverage-ignore(suite): Not run.
         case ProcedureKind.Factory:
           throw new UnsupportedError(
               'Unexpected canonical member kind ${member.kind} for $member');
@@ -447,6 +454,7 @@
     int startFileOffset;
     int fileOffset;
     if (copyLocation) {
+      // Coverage-ignore-block(suite): Not run.
       fileUri = member.fileUri;
       startFileOffset =
           member is Procedure ? member.fileStartOffset : member.fileOffset;
@@ -486,6 +494,7 @@
     int startFileOffset;
     int fileOffset;
     if (copyLocation) {
+      // Coverage-ignore-block(suite): Not run.
       fileUri = member.fileUri;
       startFileOffset =
           member is Procedure ? member.fileStartOffset : member.fileOffset;
@@ -504,7 +513,9 @@
                 type: type, isCovariantByDeclaration: isCovariantByDeclaration)
               ..isCovariantByClass = isCovariantByClass
               ..fileOffset = copyLocation
-                  ? parameter?.fileOffset ?? fileOffset
+                  ?
+                  // Coverage-ignore(suite): Not run.
+                  parameter?.fileOffset ?? fileOffset
                   : fileOffset
           ]),
       isAbstract: true,
@@ -531,6 +542,7 @@
     int startFileOffset;
     int fileOffset;
     if (copyLocation) {
+      // Coverage-ignore-block(suite): Not run.
       fileUri = procedure.fileUri;
       startFileOffset = procedure.fileStartOffset;
       fileOffset = procedure.fileOffset;
@@ -554,7 +566,11 @@
           initializer: cloner.cloneOptional(parameter.initializer))
         ..hasDeclaredInitializer = parameter.hasDeclaredInitializer
         ..isCovariantByClass = parameter.isCovariantByClass
-        ..fileOffset = copyLocation ? parameter.fileOffset : fileOffset);
+        ..fileOffset = copyLocation
+            ?
+            // Coverage-ignore(suite): Not run.
+            parameter.fileOffset
+            : fileOffset);
     }
     List<VariableDeclaration> namedParameters = [];
     int namedParameterCount = function.namedParameters.length;
@@ -568,7 +584,11 @@
           initializer: cloner.cloneOptional(parameter.initializer))
         ..hasDeclaredInitializer = parameter.hasDeclaredInitializer
         ..isCovariantByClass = parameter.isCovariantByClass
-        ..fileOffset = copyLocation ? parameter.fileOffset : fileOffset);
+        ..fileOffset = copyLocation
+            ?
+            // Coverage-ignore(suite): Not run.
+            parameter.fileOffset
+            : fileOffset);
     } else if (namedParameterCount > 1) {
       Map<String, NamedType> namedTypes = {};
       for (NamedType namedType in functionType.namedParameters) {
@@ -584,7 +604,11 @@
             initializer: cloner.cloneOptional(parameter.initializer))
           ..hasDeclaredInitializer = parameter.hasDeclaredInitializer
           ..isCovariantByClass = parameter.isCovariantByClass
-          ..fileOffset = copyLocation ? parameter.fileOffset : fileOffset);
+          ..fileOffset = copyLocation
+              ?
+              // Coverage-ignore(suite): Not run.
+              parameter.fileOffset
+              : fileOffset);
       }
     }
     return new Procedure(
diff --git a/pkg/front_end/lib/src/kernel/const_conditional_simplifier.dart b/pkg/front_end/lib/src/kernel/const_conditional_simplifier.dart
index 1d4be91..23e3148 100644
--- a/pkg/front_end/lib/src/kernel/const_conditional_simplifier.dart
+++ b/pkg/front_end/lib/src/kernel/const_conditional_simplifier.dart
@@ -30,7 +30,9 @@
     ClassHierarchy? classHierarchy,
     bool removeAsserts = false,
   }) : _removeAsserts = removeAsserts {
+    // Coverage-ignore(suite): Not run.
     coreTypes ??= new CoreTypes(_component);
+    // Coverage-ignore(suite): Not run.
     classHierarchy ??= new ClassHierarchy(_component, coreTypes);
     _typeEnvironment = new TypeEnvironment(coreTypes, classHierarchy);
     constantEvaluator = new _ConstantEvaluator(
@@ -64,7 +66,11 @@
     super.visitConditionalExpression(node, removalSentinel);
     Constant? condition = _evaluate(node.condition);
     if (condition is! BoolConstant) return node;
-    return condition.value ? node.then : node.otherwise;
+    return condition.value
+        ? node.then
+        :
+        // Coverage-ignore(suite): Not run.
+        node.otherwise;
   }
 
   @override
@@ -72,6 +78,7 @@
     super.visitIfStatement(node, removalSentinel);
     Constant? condition = _evaluate(node.condition);
     if (condition is! BoolConstant) return node;
+    // Coverage-ignore(suite): Not run.
     if (condition.value) {
       return node.then;
     } else {
@@ -80,6 +87,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TreeNode visitAssertBlock(AssertBlock node, TreeNode? removalSentinel) {
     if (_removeAsserts) {
       return removalSentinel ?? new EmptyStatement();
@@ -89,6 +97,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TreeNode visitAssertInitializer(
       AssertInitializer node, TreeNode? removalSentinel) {
     if (_removeAsserts) {
@@ -101,6 +110,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TreeNode visitAssertStatement(
       AssertStatement node, TreeNode? removalSentinel) {
     if (_removeAsserts) {
@@ -138,11 +148,15 @@
 
   Constant? _evaluateFunctionInvocation(FunctionNode node) {
     if (node.typeParameters.isNotEmpty ||
+        // Coverage-ignore(suite): Not run.
         node.requiredParameterCount != 0 ||
+        // Coverage-ignore(suite): Not run.
         node.positionalParameters.isNotEmpty ||
+        // Coverage-ignore(suite): Not run.
         node.namedParameters.isNotEmpty) {
       return null;
     }
+    // Coverage-ignore-block(suite): Not run.
     Statement? body = node.body;
     if (body is! ReturnStatement) return null;
     Expression? expression = body.expression;
@@ -171,6 +185,7 @@
   Constant? _evaluateStaticFieldGet(Field field) {
     if (_shouldNotInline(field)) return null;
     if (!field.isFinal) return null;
+    // Coverage-ignore-block(suite): Not run.
     Expression? initializer = field.initializer;
     if (initializer == null) return null;
     return _evaluate(initializer);
@@ -179,16 +194,19 @@
   Constant? _lookupStaticFieldGet(Field field) => _staticFieldCache.putIfAbsent(
       field, () => _evaluateStaticFieldGet(field));
 
+  // Coverage-ignore(suite): Not run.
   Constant? _evaluateStaticGetter(Procedure getter) {
     if (_shouldNotInline(getter)) return null;
     return _evaluateFunctionInvocation(getter.function);
   }
 
+  // Coverage-ignore(suite): Not run.
   Constant? _lookupStaticGetter(Procedure getter) => _functionCache.putIfAbsent(
       getter.function, () => _evaluateStaticGetter(getter));
 
   Constant? _lookupStaticGet(Member target) {
     if (target is Field) return _lookupStaticFieldGet(target);
+    // Coverage-ignore(suite): Not run.
     return _lookupStaticGetter(target as Procedure);
   }
 
@@ -196,16 +214,19 @@
   Constant visitStaticGet(StaticGet node) =>
       _lookupStaticGet(node.target) ?? super.visitStaticGet(node);
 
+  // Coverage-ignore(suite): Not run.
   Constant? _evaluateLocalFunctionInvocation(LocalFunctionInvocation node) {
     if (_shouldNotInline(node.variable)) return null;
     return _evaluateFunctionInvocation(node.localFunction.function);
   }
 
+  // Coverage-ignore(suite): Not run.
   Constant? _lookupLocalFunctionInvocation(LocalFunctionInvocation node) =>
       _localFunctionCache.putIfAbsent(node.localFunction.function,
           () => _evaluateLocalFunctionInvocation(node));
 
   @override
+  // Coverage-ignore(suite): Not run.
   Constant visitLocalFunctionInvocation(LocalFunctionInvocation node) =>
       _lookupLocalFunctionInvocation(node) ??
       super.visitLocalFunctionInvocation(node);
diff --git a/pkg/front_end/lib/src/kernel/constant_collection_builders.dart b/pkg/front_end/lib/src/kernel/constant_collection_builders.dart
index bef9a2e..4410cf8 100644
--- a/pkg/front_end/lib/src/kernel/constant_collection_builders.dart
+++ b/pkg/front_end/lib/src/kernel/constant_collection_builders.dart
@@ -40,9 +40,11 @@
     if (constant is AbortConstant) return constant;
     Constant spread = evaluator.unlower(constant);
     if (evaluator.shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       // Unevaluated spread
       parts.add(spread);
     } else if (spread == evaluator.nullConstant) {
+      // Coverage-ignore-block(suite): Not run.
       // Null spread
       return evaluator.createEvaluationErrorConstant(
           spreadExpression, messageConstEvalNullValue);
@@ -54,12 +56,14 @@
       } else if (spread is SetConstant) {
         entries = spread.entries;
       } else if (evaluator.backend.isLoweredListConstant(spread)) {
+        // Coverage-ignore-block(suite): Not run.
         entries = <Constant>[];
         evaluator.backend.forEachLoweredListConstantElement(spread,
             (Constant element) {
           entries.add(element);
         });
       } else if (evaluator.backend.isLoweredSetConstant(constant)) {
+        // Coverage-ignore-block(suite): Not run.
         entries = <Constant>[];
         evaluator.backend.forEachLoweredSetConstantElement(spread,
             (Constant element) {
@@ -129,6 +133,7 @@
     for (Object part in parts) {
       if (part is List<Constant>) {
         if (part.isEmpty) continue;
+        // Coverage-ignore-block(suite): Not run.
         lists.add(new ConstantExpression(new ListConstant(elementType, part)));
       } else if (part is Constant) {
         lists.add(evaluator._wrap(part));
@@ -150,6 +155,7 @@
       : super(original, elementType, evaluator);
 
   @override
+  // Coverage-ignore(suite): Not run.
   SetLiteral makeLiteral(List<Expression> elements) =>
       new SetLiteral(elements, isConst: true);
 
@@ -163,6 +169,7 @@
             templateConstEvalElementNotPrimitiveEquality
                 .withArguments(constant));
       } else {
+        // Coverage-ignore-block(suite): Not run.
         return evaluator.createEvaluationErrorConstant(context,
             templateConstEvalElementImplementsEqual.withArguments(constant));
       }
@@ -193,6 +200,7 @@
       SetConstant result = new SetConstant(elementType, entries);
       return evaluator.lowerSetConstant(result);
     }
+    // Coverage-ignore-block(suite): Not run.
     List<Expression> sets = <Expression>[];
     for (Object part in parts) {
       if (part is List<Constant>) {
@@ -235,6 +243,7 @@
     Constant value = evaluator._evaluateSubexpression(element.value);
     if (value is AbortConstant) return value;
     if (evaluator.shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       parts.add(evaluator.unevaluated(
           element.key,
           new MapLiteral([
@@ -253,9 +262,11 @@
     if (constant is AbortConstant) return constant;
     Constant spread = evaluator.unlower(constant);
     if (evaluator.shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       // Unevaluated spread
       parts.add(spread);
     } else if (spread == evaluator.nullConstant) {
+      // Coverage-ignore-block(suite): Not run.
       // Null spread
       return evaluator.createEvaluationErrorConstant(
           spreadExpression, messageConstEvalNullValue);
@@ -268,6 +279,7 @@
           if (error != null) return error;
         }
       } else if (evaluator.backend.isLoweredMapConstant(spread)) {
+        // Coverage-ignore-block(suite): Not run.
         AbortConstant? error;
         evaluator.backend.forEachLoweredMapConstantEntry(spread,
             (Constant key, Constant value) {
@@ -300,6 +312,7 @@
         return evaluator.createEvaluationErrorConstant(keyContext,
             templateConstEvalKeyNotPrimitiveEquality.withArguments(key));
       } else {
+        // Coverage-ignore-block(suite): Not run.
         return evaluator.createEvaluationErrorConstant(
             keyContext, templateConstEvalKeyImplementsEqual.withArguments(key));
       }
@@ -325,6 +338,7 @@
       return evaluator
           .lowerMapConstant(new MapConstant(keyType, valueType, entries));
     }
+    // Coverage-ignore-block(suite): Not run.
     List<Expression> maps = <Expression>[];
     for (Object part in parts) {
       if (part is List<ConstantMapEntry>) {
diff --git a/pkg/front_end/lib/src/kernel/constant_evaluator.dart b/pkg/front_end/lib/src/kernel/constant_evaluator.dart
index 00176d6..504aa78 100644
--- a/pkg/front_end/lib/src/kernel/constant_evaluator.dart
+++ b/pkg/front_end/lib/src/kernel/constant_evaluator.dart
@@ -346,12 +346,14 @@
 
       if (StaticWeakReferences.isAnnotatedWithWeakReferencePragma(
           parent, typeEnvironment.coreTypes)) {
+        // Coverage-ignore-block(suite): Not run.
         StaticWeakReferences.validateWeakReferenceDeclaration(
             parent, constantEvaluator.errorReporter);
       }
       final Iterable<InstanceConstant> resourceAnnotations =
           ResourceIdentifiers.findResourceAnnotations(parent);
       if (resourceAnnotations.isNotEmpty) {
+        // Coverage-ignore-block(suite): Not run.
         ResourceIdentifiers.validateResourceIdentifierDeclaration(
             parent, constantEvaluator.errorReporter, resourceAnnotations);
       }
@@ -453,7 +455,9 @@
             evaluateAndTransformWithContext(node, initializer!)..parent = node;
 
         // If this constant is inlined, remove it.
-        if (!keepFields && shouldInline(initializer)) {
+        if (!keepFields &&
+            // Coverage-ignore(suite): Not run.
+            shouldInline(initializer)) {
           return removalSentinel!;
         }
       } else {
@@ -511,6 +515,7 @@
       }
     } else if (target is Procedure) {
       if (target.kind == ProcedureKind.Method) {
+        // Coverage-ignore-block(suite): Not run.
         return evaluateAndTransformWithContext(node, node);
       } else if (target.kind == ProcedureKind.Getter && enableConstFunctions) {
         return evaluateAndTransformWithContext(node, node);
@@ -550,6 +555,7 @@
       // Handle [StaticGet] of constant fields also when these are not inlined.
       expression = (expression.target as Field).initializer!;
     } else if (expression is VariableGet && expression.variable.isConst) {
+      // Coverage-ignore-block(suite): Not run.
       // Handle [VariableGet] of constant locals also when these are not
       // inlined.
       expression = expression.variable.initializer!;
@@ -907,6 +913,7 @@
       if (isAlwaysExhaustiveType &&
           !hasDefault &&
           constantEvaluator.evaluationMode != EvaluationMode.strong) {
+        // Coverage-ignore-block(suite): Not run.
         if (!node.lastCaseTerminates) {
           PatternSwitchCase lastCase = node.cases.last;
           Statement body = lastCase.body;
@@ -1179,6 +1186,7 @@
             if (labelUser is ContinueSwitchStatement) {
               labelUser.target = replacementCase;
             } else {
+              // Coverage-ignore-block(suite): Not run.
               // TODO(cstefantsova): Handle other label user types.
               return throw new UnsupportedError(
                   "Unexpected label user: ${labelUser.runtimeType}");
@@ -1201,6 +1209,7 @@
         if (caseIndex == node.cases.length - 1 &&
             needsThrowForNull &&
             !node.lastCaseTerminates) {
+          // Coverage-ignore-block(suite): Not run.
           LabeledStatement target;
           if (node.parent is LabeledStatement) {
             target = node.parent as LabeledStatement;
@@ -1214,7 +1223,9 @@
         cases.add(createBlock([
           ...caseVariables,
           caseBlock,
-          if (breakStatement != null) breakStatement
+          if (breakStatement != null)
+            // Coverage-ignore(suite): Not run.
+            breakStatement
         ], fileOffset: switchCase.fileOffset));
       }
 
@@ -1226,7 +1237,9 @@
                   createStringLiteral(
                       forUnsoundness
                           ? messageUnsoundSwitchStatementError.problemMessage
-                          : messageNeverReachableSwitchStatementError
+                          :
+                          // Coverage-ignore(suite): Not run.
+                          messageNeverReachableSwitchStatementError
                               .problemMessage,
                       fileOffset: node.fileOffset)
                 ], fileOffset: node.fileOffset),
@@ -1270,6 +1283,7 @@
       }
 
       if (replacementStatements.length == 1) {
+        // Coverage-ignore-block(suite): Not run.
         replacement = replacementStatements.first;
       } else {
         replacement = new Block(replacementStatements)
@@ -1277,6 +1291,7 @@
       }
     }
     if (outerLabeledStatement != null) {
+      // Coverage-ignore-block(suite): Not run.
       outerLabeledStatement.body = replacement..parent = outerLabeledStatement;
       replacement = outerLabeledStatement;
     }
@@ -1324,14 +1339,17 @@
         computeUnreachable: retainDataForTesting);
     List<ExhaustivenessError>? reportedErrors;
     if (_exhaustivenessDataForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       reportedErrors = [];
     }
     for (ExhaustivenessError error in errors) {
       if (error is UnreachableCaseError) {
+        // Coverage-ignore-block(suite): Not run.
         reportedErrors?.add(error);
       } else if (error is NonExhaustiveError &&
           !hasDefault &&
           mustBeExhaustive) {
+        // Coverage-ignore(suite): Not run.
         reportedErrors?.add(error);
         constantEvaluator.errorReporter.report(
             constantEvaluator.createLocatedMessageWithOffset(
@@ -1347,6 +1365,7 @@
       }
     }
     if (_exhaustivenessDataForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       _exhaustivenessDataForTesting.objectFieldLookup ??= _exhaustivenessCache;
       _exhaustivenessDataForTesting.switchResults[replacement] =
           new ExhaustivenessResult(type, cases,
@@ -1432,7 +1451,9 @@
           // the else-statement is not covered.
           createBoolLiteral(true, fileOffset: node.fileOffset);
       if (statements.isNotEmpty ||
+          // Coverage-ignore(suite): Not run.
           expressionEffects.isNotEmpty ||
+          // Coverage-ignore(suite): Not run.
           statementEffects.isNotEmpty) {
         then = createBlock([
           ...statements,
@@ -1607,7 +1628,9 @@
                     fileOffset: node.fileOffset),
                 forErrorHandling: true)),
             fileOffset: node.fileOffset),
-        ...effects.map((e) => createExpressionStatement(e)),
+        ...effects.map(
+            // Coverage-ignore(suite): Not run.
+            (e) => createExpressionStatement(e)),
       ];
     }
 
@@ -1628,6 +1651,7 @@
       // This avoids unnecessary [BlockExpression]s created by the lowering of
       // [PatternAssignment]s for effect.
       if (_exhaustivenessDataForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         ExhaustivenessResult? result =
             _exhaustivenessDataForTesting.switchResults[expression];
         if (result != null) {
@@ -1762,6 +1786,7 @@
         switchCases.add(switchCase);
       }
       if (constantEvaluator.evaluationMode != EvaluationMode.strong) {
+        // Coverage-ignore-block(suite): Not run.
         switchCases.add(new SwitchCase(
             [],
             [],
@@ -1854,7 +1879,9 @@
               // case.
               createBoolLiteral(true, fileOffset: node.fileOffset);
           if (statements.isNotEmpty ||
+              // Coverage-ignore(suite): Not run.
               expressionEffects.isNotEmpty ||
+              // Coverage-ignore(suite): Not run.
               statementEffects.isNotEmpty) {
             tailStatements = [
               ...statements,
@@ -1904,7 +1931,9 @@
                   createStringLiteral(
                       forUnsoundness
                           ? messageUnsoundSwitchExpressionError.problemMessage
-                          : messageNeverReachableSwitchExpressionError
+                          :
+                          // Coverage-ignore(suite): Not run.
+                          messageNeverReachableSwitchExpressionError
                               .problemMessage,
                       fileOffset: node.fileOffset)
                 ], fileOffset: node.fileOffset),
@@ -2008,6 +2037,7 @@
 
       if (allConstant) {
         if (hasUnevaluated) {
+          // Coverage-ignore-block(suite): Not run.
           return makeConstantExpression(new UnevaluatedConstant(node), node);
         } else {
           Constant constant = constantEvaluator.canonicalize(
@@ -2118,6 +2148,7 @@
     // arguments are already constant evaluated.
     if (StaticWeakReferences.isAnnotatedWithWeakReferencePragma(
         node.target, typeEnvironment.coreTypes)) {
+      // Coverage-ignore-block(suite): Not run.
       StaticWeakReferences.validateWeakReferenceUse(
           node, constantEvaluator.errorReporter);
     }
@@ -2129,6 +2160,7 @@
       ConstantExpression node, TreeNode? removalSentinel) {
     Constant constant = node.constant;
     if (constant is UnevaluatedConstant && constantEvaluator.hasEnvironment) {
+      // Coverage-ignore-block(suite): Not run.
       Expression expression = constant.expression;
       return evaluateAndTransformWithContext(expression, expression);
     } else {
@@ -2297,6 +2329,7 @@
 
   bool hasEnvironmentKey(String key) {
     if (DartLibrarySupport.isDartLibraryQualifier(key)) {
+      // Coverage-ignore-block(suite): Not run.
       return (_supportedLibrariesCache ??= _computeSupportedLibraries())
           .containsKey(key);
     }
@@ -2309,6 +2342,7 @@
     switch (evaluationMode) {
       case EvaluationMode.strong:
         return norm(coreTypes, type);
+      // Coverage-ignore(suite): Not run.
       case EvaluationMode.weak:
         type = norm(coreTypes, type);
         return computeConstCanonicalType(type, coreTypes) ?? type;
@@ -2319,6 +2353,7 @@
     switch (evaluationMode) {
       case EvaluationMode.strong:
         return types.map((DartType type) => norm(coreTypes, type)).toList();
+      // Coverage-ignore(suite): Not run.
       case EvaluationMode.weak:
         return types.map((DartType type) {
           type = norm(coreTypes, type);
@@ -2330,6 +2365,7 @@
   LocatedMessage createLocatedMessage(TreeNode? node, Message message) {
     Uri? uri = getFileUri(node);
     if (uri == null) {
+      // Coverage-ignore-block(suite): Not run.
       // TODO(johnniwinther): Ensure that we always have a uri.
       return message.withoutLocation();
     }
@@ -2341,6 +2377,7 @@
       TreeNode? node, int offset, Message message) {
     Uri? uri = getFileUri(node);
     if (uri == null) {
+      // Coverage-ignore-block(suite): Not run.
       // TODO(johnniwinther): Ensure that we always have a uri.
       return message.withoutLocation();
     }
@@ -2402,6 +2439,7 @@
             locatedMessageActualError
           ];
           if (result.context != null) {
+            // Coverage-ignore-block(suite): Not run.
             contextMessages.addAll(result.context!);
           }
           if (contextNode != null && contextNode != result.node) {
@@ -2455,6 +2493,7 @@
     }
     if (result is UnevaluatedConstant) {
       if (errorOnUnevaluatedConstant) {
+        // Coverage-ignore-block(suite): Not run.
         return createEvaluationErrorConstant(node, messageConstEvalUnevaluated);
       }
       return canonicalize(new UnevaluatedConstant(
@@ -2486,6 +2525,7 @@
       // No return statement in function body with void return type.
       return new NullConstant();
     }
+    // Coverage-ignore(suite): Not run.
     return createEvaluationErrorConstant(
         statement,
         templateConstEvalError.withArguments(
@@ -2496,7 +2536,9 @@
   /// Returns [null] on success and an error-"constant" on failure, as such the
   /// return value should be checked.
   AbortConstant? executeConstructorBody(Constructor constructor) {
-    if (!enableConstFunctions && !inExtensionTypeConstConstructor) {
+    if (!enableConstFunctions &&
+        // Coverage-ignore(suite): Not run.
+        !inExtensionTypeConstConstructor) {
       throw new UnsupportedError("Statement evaluation is only supported when "
           "in extension type const constructors or when the const functions "
           "feature is enabled.");
@@ -2515,6 +2557,7 @@
           templateConstEvalError
               .withArguments("Constructors can't have a return value."));
     } else if (status is! ProceedStatus) {
+      // Coverage-ignore-block(suite): Not run.
       return createEvaluationErrorConstant(
           constructor,
           templateConstEvalError
@@ -2572,6 +2615,7 @@
 
   Constant lower(Constant original, Constant replacement) {
     if (!identical(original, replacement)) {
+      // Coverage-ignore-block(suite): Not run.
       original = canonicalize(original);
       replacement = canonicalize(replacement);
       lowered[replacement] = original;
@@ -2835,6 +2879,7 @@
     assert(_gotError == null);
 
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(
           node,
           new RecordLiteral([
@@ -2852,6 +2897,7 @@
   Constant visitListConcatenation(ListConcatenation node) {
     DartType? type = _evaluateDartType(node, node.typeArgument);
     if (type == null) {
+      // Coverage-ignore-block(suite): Not run.
       AbortConstant error = _gotError!;
       _gotError = null;
       return error;
@@ -2904,6 +2950,7 @@
   Constant visitSetConcatenation(SetConcatenation node) {
     DartType? type = _evaluateDartType(node, node.typeArgument);
     if (type == null) {
+      // Coverage-ignore-block(suite): Not run.
       AbortConstant error = _gotError!;
       _gotError = null;
       return error;
@@ -2964,6 +3011,7 @@
   Constant visitMapConcatenation(MapConcatenation node) {
     DartType? keyType = _evaluateDartType(node, node.keyType);
     if (keyType == null) {
+      // Coverage-ignore-block(suite): Not run.
       AbortConstant error = _gotError!;
       _gotError = null;
       return error;
@@ -2971,6 +3019,7 @@
     assert(_gotError == null);
     DartType? valueType = _evaluateDartType(node, node.valueType);
     if (valueType == null) {
+      // Coverage-ignore-block(suite): Not run.
       AbortConstant error = _gotError!;
       _gotError = null;
       return error;
@@ -3033,6 +3082,7 @@
 
     bool isSymbol = klass == coreTypes.internalSymbolClass;
     if (isSymbol && shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(
           node,
           new ConstructorInvocation(constructor,
@@ -3050,6 +3100,7 @@
       if (nameValue is StringConstant) {
         return canonicalize(new SymbolConstant(nameValue.value, null));
       }
+      // Coverage-ignore(suite): Not run.
       return createEvaluationErrorConstant(node.arguments.positional.first,
           templateConstEvalInvalidSymbolName.withArguments(nameValue));
     }
@@ -3065,7 +3116,10 @@
     final List<DartType> typeArguments = convertTypes(types);
 
     // Fill in any missing type arguments with "dynamic".
-    for (int i = typeArguments.length; i < klass.typeParameters.length; i++) {
+    for (int i = typeArguments.length;
+        i < klass.typeParameters.length;
+        // Coverage-ignore(suite): Not run.
+        i++) {
       // Coverage-ignore: Probably unreachable.
       typeArguments.add(const DynamicType());
     }
@@ -3086,6 +3140,7 @@
           constructor, typeArguments, positional, named, node);
       if (error != null) return error;
       if (shouldBeUnevaluated) {
+        // Coverage-ignore-block(suite): Not run.
         return unevaluated(node, instanceBuilder!.buildUnevaluatedInstance());
       }
       return canonicalize(instanceBuilder!.buildInstance());
@@ -3117,6 +3172,7 @@
     return withNewInstanceBuilder(
         node.classNode, convertTypes(node.typeArguments), () {
       for (AssertStatement statement in node.asserts) {
+        // Coverage-ignore-block(suite): Not run.
         AbortConstant? error = checkAssert(statement);
         if (error != null) return error;
       }
@@ -3133,6 +3189,7 @@
       }
       if (error != null) return error;
       for (Expression value in node.unusedArguments) {
+        // Coverage-ignore-block(suite): Not run.
         if (error != null) return error;
         Constant constant = _evaluateSubexpression(value);
         if (constant is AbortConstant) {
@@ -3145,6 +3202,7 @@
       }
       if (error != null) return error;
       if (shouldBeUnevaluated) {
+        // Coverage-ignore-block(suite): Not run.
         return unevaluated(node, instanceBuilder!.buildUnevaluatedInstance());
       }
       // We can get here when re-evaluating a previously unevaluated constant.
@@ -3217,6 +3275,7 @@
           List<DartType>? types = _evaluateSuperTypeArguments(
               init, constructor.enclosingClass.supertype!);
           if (types == null) {
+            // Coverage-ignore-block(suite): Not run.
             AbortConstant error = _gotError!;
             _gotError = null;
             return error;
@@ -3226,6 +3285,7 @@
           List<Constant>? positionalArguments =
               _evaluatePositionalArguments(init.arguments.positional);
           if (positionalArguments == null) {
+            // Coverage-ignore-block(suite): Not run.
             AbortConstant error = _gotError!;
             _gotError = null;
             return error;
@@ -3234,6 +3294,7 @@
           Map<String, Constant>? namedArguments =
               _evaluateNamedArguments(init.arguments.named);
           if (namedArguments == null) {
+            // Coverage-ignore-block(suite): Not run.
             AbortConstant error = _gotError!;
             _gotError = null;
             return error;
@@ -3252,6 +3313,7 @@
           List<Constant>? positionalArguments =
               _evaluatePositionalArguments(init.arguments.positional);
           if (positionalArguments == null) {
+            // Coverage-ignore-block(suite): Not run.
             AbortConstant error = _gotError!;
             _gotError = null;
             return error;
@@ -3261,6 +3323,7 @@
           Map<String, Constant>? namedArguments =
               _evaluateNamedArguments(init.arguments.named);
           if (namedArguments == null) {
+            // Coverage-ignore-block(suite): Not run.
             AbortConstant error = _gotError!;
             _gotError = null;
             return error;
@@ -3274,6 +3337,7 @@
           AbortConstant? error = checkAssert(init.statement);
           if (error != null) return error;
         } else {
+          // Coverage-ignore-block(suite): Not run.
           // Coverage-ignore: Probably unreachable.
           // InvalidInitializer or new Initializers.
           // InvalidInitializer is (currently) only
@@ -3291,6 +3355,7 @@
       }
 
       for (UnevaluatedConstant constant in env.unevaluatedUnreadConstants) {
+        // Coverage-ignore-block(suite): Not run.
         instanceBuilder!.unusedArguments.add(_wrap(constant));
       }
 
@@ -3311,6 +3376,7 @@
     if (condition is AbortConstant) return condition;
 
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       Expression? message = null;
       if (statement.message != null) {
         enterLazy();
@@ -3332,6 +3398,7 @@
         final Constant message = _evaluateSubexpression(statement.message!);
         if (message is AbortConstant) return message;
         if (shouldBeUnevaluated) {
+          // Coverage-ignore-block(suite): Not run.
           instanceBuilder!.asserts.add(new AssertStatement(_wrap(condition),
               message: _wrap(message),
               conditionStartOffset: statement.conditionStartOffset,
@@ -3350,6 +3417,7 @@
         }
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       return createEvaluationErrorConstant(
           statement.condition,
           templateConstEvalInvalidType.withArguments(
@@ -3387,6 +3455,7 @@
         _evaluatePositionalArguments(node.arguments.positional);
 
     if (positionalArguments == null) {
+      // Coverage-ignore-block(suite): Not run.
       AbortConstant error = _gotError!;
       _gotError = null;
       return error;
@@ -3394,6 +3463,7 @@
     assert(_gotError == null);
 
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(
           node,
           new DynamicInvocation(
@@ -3438,6 +3508,7 @@
     assert(_gotError == null);
 
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(
           node,
           new InstanceInvocation(
@@ -3490,6 +3561,7 @@
         _evaluatePositionalArguments(arguments.positional);
 
     if (positional == null) {
+      // Coverage-ignore-block(suite): Not run.
       AbortConstant error = _gotError!;
       _gotError = null;
       return error;
@@ -3499,6 +3571,7 @@
     // Evaluate type arguments of the function invoked.
     List<DartType>? types = _evaluateTypeArguments(node, arguments);
     if (types == null) {
+      // Coverage-ignore-block(suite): Not run.
       AbortConstant error = _gotError!;
       _gotError = null;
       return error;
@@ -3509,6 +3582,7 @@
     final Map<String, Constant>? named =
         _evaluateNamedArguments(arguments.named);
     if (named == null) {
+      // Coverage-ignore-block(suite): Not run.
       AbortConstant error = _gotError!;
       _gotError = null;
       return error;
@@ -3520,6 +3594,7 @@
           receiver.function, types, positional, named,
           functionEnvironment: receiver.environment);
     } else {
+      // Coverage-ignore-block(suite): Not run.
       return createEvaluationErrorConstant(
           node,
           templateConstEvalError
@@ -3534,6 +3609,7 @@
     final Constant right = _evaluateSubexpression(node.right);
     if (right is AbortConstant) return right;
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(
           node,
           new EqualsCall(_wrap(left), _wrap(right),
@@ -3551,6 +3627,7 @@
     if (expression is AbortConstant) return expression;
 
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(node,
           new EqualsNull(_wrap(expression))..fileOffset = node.fileOffset);
     }
@@ -3572,6 +3649,7 @@
                 left, left.getType(staticTypeContext)));
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       if (left is NullConstant ||
           left is BoolConstant ||
           left is IntConstant ||
@@ -3600,12 +3678,14 @@
     if (receiver is PrimitiveConstant &&
         op == 'toString' &&
         enableConstFunctions) {
+      // Coverage-ignore-block(suite): Not run.
       return new StringConstant(receiver.value.toString());
     }
 
     // Handle == and != first (it's common between all types). Since `a != b` is
     // parsed as `!(a == b)` it is handled implicitly through ==.
     if (positionalArguments.length == 1 && op == '==') {
+      // Coverage-ignore-block(suite): Not run.
       final Constant right = positionalArguments[0];
       return _handleEquals(node, receiver, right);
     }
@@ -3637,6 +3717,7 @@
                 }
                 return canonicalize(new StringConstant(receiver.value[index]));
               }
+              // Coverage-ignore(suite): Not run.
               return createEvaluationErrorConstant(
                   node,
                   templateConstEvalInvalidBinaryOperandType.withArguments(
@@ -3702,6 +3783,7 @@
           return canonicalize(
               evaluateBinaryNumericOperation(op, receiver.value, value, node));
         }
+        // Coverage-ignore(suite): Not run.
         return createEvaluationErrorConstant(
             node,
             templateConstEvalInvalidBinaryOperandType.withArguments(
@@ -3742,6 +3824,7 @@
               }
               return receiver.entries[index];
             }
+            // Coverage-ignore(suite): Not run.
             return createEvaluationErrorConstant(
                 node,
                 templateConstEvalInvalidBinaryOperandType.withArguments(
@@ -3774,6 +3857,7 @@
       // Evaluate type arguments of the method invoked.
       List<DartType>? typeArguments = _evaluateTypeArguments(node, arguments);
       if (typeArguments == null) {
+        // Coverage-ignore-block(suite): Not run.
         AbortConstant error = _gotError!;
         _gotError = null;
         return error;
@@ -3784,13 +3868,17 @@
       final Map<String, Constant>? namedArguments =
           _evaluateNamedArguments(arguments.named);
       if (namedArguments == null) {
+        // Coverage-ignore-block(suite): Not run.
         AbortConstant error = _gotError!;
         _gotError = null;
         return error;
       }
       assert(_gotError == null);
 
-      if (receiver is FunctionValue && name == Name.callName) {
+      if (receiver is FunctionValue &&
+          // Coverage-ignore(suite): Not run.
+          name == Name.callName) {
+        // Coverage-ignore-block(suite): Not run.
         return _handleFunctionInvocation(receiver.function, typeArguments,
             positionalArguments, namedArguments,
             functionEnvironment: receiver.environment);
@@ -3841,6 +3929,7 @@
     final Constant left = _evaluateSubexpression(node.left);
     if (left is AbortConstant) return left;
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       enterLazy();
       Constant right = _evaluateSubexpression(node.right);
       if (right is AbortConstant) return right;
@@ -3855,9 +3944,12 @@
 
           final Constant right = _evaluateSubexpression(node.right);
           if (right is AbortConstant) return right;
-          if (right is BoolConstant || right is UnevaluatedConstant) {
+          if (right is BoolConstant ||
+              // Coverage-ignore(suite): Not run.
+              right is UnevaluatedConstant) {
             return right;
           }
+          // Coverage-ignore(suite): Not run.
           return createEvaluationErrorConstant(
               node,
               templateConstEvalInvalidBinaryOperandType.withArguments(
@@ -3866,6 +3958,7 @@
                   typeEnvironment.coreTypes.boolNonNullableRawType,
                   right.getType(staticTypeContext)));
         }
+        // Coverage-ignore(suite): Not run.
         return createEvaluationErrorConstant(
             node,
             templateConstEvalInvalidMethodInvocation.withArguments(
@@ -3876,9 +3969,12 @@
 
           final Constant right = _evaluateSubexpression(node.right);
           if (right is AbortConstant) return right;
-          if (right is BoolConstant || right is UnevaluatedConstant) {
+          if (right is BoolConstant ||
+              // Coverage-ignore(suite): Not run.
+              right is UnevaluatedConstant) {
             return right;
           }
+          // Coverage-ignore(suite): Not run.
           return createEvaluationErrorConstant(
               node,
               templateConstEvalInvalidBinaryOperandType.withArguments(
@@ -3887,6 +3983,7 @@
                   typeEnvironment.coreTypes.boolNonNullableRawType,
                   right.getType(staticTypeContext)));
         }
+        // Coverage-ignore(suite): Not run.
         return createEvaluationErrorConstant(
             node,
             templateConstEvalInvalidMethodInvocation.withArguments(
@@ -3914,6 +4011,7 @@
           new ConditionalExpression(_wrap(condition), _wrap(then),
               _wrap(otherwise), env.substituteType(node.staticType)));
     } else {
+      // Coverage-ignore-block(suite): Not run.
       return createEvaluationErrorConstant(
           node.condition,
           templateConstEvalInvalidType.withArguments(
@@ -3957,6 +4055,7 @@
     if (receiver is StringConstant && node.name.text == 'length') {
       return canonicalize(intFolder.makeIntConstant(receiver.value.length));
     } else if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(
           node,
           new InstanceGet(node.kind, _wrap(receiver), node.name,
@@ -4016,6 +4115,7 @@
     final Constant receiver = _evaluateSubexpression(node.receiver);
     if (receiver is AbortConstant) return receiver;
     if (receiver is RecordConstant && enableConstFunctions) {
+      // Coverage-ignore-block(suite): Not run.
       if (node.index >= receiver.positional.length) {
         return new _AbortDueToThrowConstant(node, new StateError('No element'));
       }
@@ -4032,6 +4132,7 @@
     final Constant receiver = _evaluateSubexpression(node.receiver);
     if (receiver is AbortConstant) return receiver;
     if (receiver is RecordConstant && enableConstFunctions) {
+      // Coverage-ignore-block(suite): Not run.
       Constant? result = receiver.named[node.name];
       if (result == null) {
         return new _AbortDueToThrowConstant(node, new StateError('No element'));
@@ -4051,12 +4152,15 @@
     if (receiver is AbortConstant) return receiver;
     if (receiver is StringConstant && node.name.text == 'length') {
       return canonicalize(intFolder.makeIntConstant(receiver.value.length));
-    } else if (shouldBeUnevaluated) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (shouldBeUnevaluated) {
       return unevaluated(
           node, new DynamicGet(node.kind, _wrap(receiver), node.name));
     } else if (receiver is NullConstant) {
       return createEvaluationErrorConstant(node, messageConstEvalNullValue);
     }
+    // Coverage-ignore(suite): Not run.
     return createEvaluationErrorConstant(
         node,
         templateConstEvalInvalidPropertyGet.withArguments(
@@ -4077,6 +4181,7 @@
   Constant visitFunctionTearOff(FunctionTearOff node) {
     final Constant receiver = _evaluateSubexpression(node.receiver);
     if (receiver is AbortConstant) return receiver;
+    // Coverage-ignore(suite): Not run.
     return createEvaluationErrorConstant(
         node,
         templateConstEvalInvalidPropertyGet.withArguments(
@@ -4102,6 +4207,7 @@
     final VariableDeclaration variable = node.variable;
     if (enableConstFunctions || inExtensionTypeConstConstructor) {
       return env.lookupVariable(variable) ??
+          // Coverage-ignore(suite): Not run.
           createEvaluationErrorConstant(
               node,
               templateConstEvalGetterNotFound
@@ -4136,6 +4242,7 @@
       if (result != null) {
         return result;
       }
+      // Coverage-ignore(suite): Not run.
       return createEvaluationErrorConstant(
           node,
           templateConstEvalError
@@ -4166,6 +4273,7 @@
           () => evaluateExpressionInContext(target, target.initializer!));
     } else if (target is Procedure) {
       if (target.kind == ProcedureKind.Method) {
+        // Coverage-ignore-block(suite): Not run.
         // TODO(johnniwinther): Remove this. This should never occur.
         return canonicalize(new StaticTearOffConstant(target));
       } else if (target.kind == ProcedureKind.Getter && enableConstFunctions) {
@@ -4200,9 +4308,11 @@
         if (last is StringBuffer) {
           last.write(value);
         } else {
+          // Coverage-ignore-block(suite): Not run.
           concatenated.add(new StringBuffer(value));
         }
       } else if (shouldBeUnevaluated) {
+        // Coverage-ignore-block(suite): Not run.
         // The constant is either unevaluated or a non-primitive in an
         // unevaluated context. In both cases we defer the evaluation and/or
         // error reporting till later.
@@ -4215,6 +4325,7 @@
       }
     }
     if (concatenated.length > 1) {
+      // Coverage-ignore-block(suite): Not run.
       final List<Expression> expressions =
           new List<Expression>.generate(concatenated.length, (int i) {
         Object value = concatenated[i];
@@ -4251,7 +4362,9 @@
       } else if (defaultValue != null) {
         if (defaultValue is BoolConstant) {
           boolConstant = makeBoolConstant(defaultValue.value);
-        } else if (defaultValue is NullConstant) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (defaultValue is NullConstant) {
           boolConstant = nullConstant;
         } else {
           // Coverage-ignore: Probably unreachable.
@@ -4271,6 +4384,7 @@
         if (intFolder.isInt(defaultValue)) {
           intConstant = defaultValue;
         } else {
+          // Coverage-ignore-block(suite): Not run.
           intConstant = nullConstant;
         }
       } else {
@@ -4285,6 +4399,7 @@
         if (defaultValue is StringConstant) {
           stringConstant = defaultValue;
         } else {
+          // Coverage-ignore-block(suite): Not run.
           stringConstant = nullConstant;
         }
       } else {
@@ -4356,7 +4471,9 @@
               } else {
                 return _handleHasEnvironment(name);
               }
-            } else if (name is NullConstant) {
+            }
+            // Coverage-ignore(suite): Not run.
+            else if (name is NullConstant) {
               return createEvaluationErrorConstant(
                   node, messageConstEvalNullValue);
             }
@@ -4388,6 +4505,7 @@
           return createExpressionErrorConstant(node,
               templateNotConstantExpression.withArguments('New expression'));
         } else {
+          // Coverage-ignore-block(suite): Not run.
           return createEvaluationErrorConstant(
               node,
               templateNotConstantExpression
@@ -4470,6 +4588,7 @@
       final Constant result = executeBody(function.body!);
       if (result is NullConstant &&
           function.returnType.nullability == Nullability.nonNullable) {
+        // Coverage-ignore-block(suite): Not run.
         // Ensure that the evaluated constant returned is not null if the
         // function has a non-nullable return type.
         return createEvaluationErrorConstant(
@@ -4491,6 +4610,7 @@
     final Constant constant = _evaluateSubexpression(node.operand);
     if (constant is AbortConstant) return constant;
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(node,
           new AsExpression(_wrap(constant), env.substituteType(node.type)));
     }
@@ -4509,6 +4629,7 @@
     final Constant constant = _evaluateSubexpression(node.operand);
     if (constant is AbortConstant) return constant;
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(
           node,
           new IsExpression(_wrap(constant), env.substituteType(node.type))
@@ -4527,6 +4648,7 @@
       if (strongMode) {
         return isSubtype(constant, type, SubtypeCheckMode.withNullabilities);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         // In weak checking mode: if e evaluates to a value v and v has runtime
         // type S, an instance check e is T occurring in a legacy library or an
         // opted-in library is evaluated as follows:
@@ -4556,6 +4678,7 @@
     switch (evaluationMode) {
       case EvaluationMode.strong:
         return makeBoolConstant(performIs(constant, strongMode: true));
+      // Coverage-ignore(suite): Not run.
       case EvaluationMode.weak:
         return makeBoolConstant(performIs(constant, strongMode: false));
     }
@@ -4568,6 +4691,7 @@
     if (constant is BoolConstant) {
       return makeBoolConstant(constant != trueConstant);
     }
+    // Coverage-ignore-block(suite): Not run.
     if (shouldBeUnevaluated) {
       return unevaluated(node, new Not(_wrap(constant)));
     }
@@ -4587,6 +4711,7 @@
       return createEvaluationErrorConstant(node, messageConstEvalNonNull);
     }
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(node, new NullCheck(_wrap(constant)));
     }
     return constant;
@@ -4614,6 +4739,7 @@
     Constant constant = _evaluateSubexpression(node.expression);
     if (constant is AbortConstant) return constant;
     if (shouldBeUnevaluated) {
+      // Coverage-ignore-block(suite): Not run.
       return unevaluated(
           node,
           new Instantiation(_wrap(constant),
@@ -4807,6 +4933,7 @@
     DartType constantType =
         constant.getType(staticTypeContext).extensionTypeErasure;
     if (mode == SubtypeCheckMode.ignoringNullabilities) {
+      // Coverage-ignore-block(suite): Not run.
       constantType = rawLegacyErasure(constantType) ?? constantType;
     }
     if (type is RecordType && constant is RecordConstant) {
@@ -4859,6 +4986,7 @@
       case EvaluationMode.strong:
         result = isSubtype(constant, type, SubtypeCheckMode.withNullabilities);
         break;
+      // Coverage-ignore(suite): Not run.
       case EvaluationMode.weak:
         result =
             isSubtype(constant, type, SubtypeCheckMode.ignoringNullabilities);
@@ -4990,7 +5118,9 @@
       positional[i] = _wrap(positionalArgs[i]);
     }
     int i = 0;
-    namedArgs.forEach((String name, Constant value) {
+    namedArgs.forEach(
+        // Coverage-ignore(suite): Not run.
+        (String name, Constant value) {
       named[i++] = new NamedExpression(name, _wrap(value));
     });
     return new Arguments(positional, named: named, types: types);
@@ -5097,6 +5227,7 @@
   Constant visitStaticSet(StaticSet node) => _notAConstantExpression(node);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Constant visitAbstractSuperMethodInvocation(
           AbstractSuperMethodInvocation node) =>
       _notAConstantExpression(node);
@@ -5106,10 +5237,12 @@
       _notAConstantExpression(node);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Constant visitAbstractSuperPropertyGet(AbstractSuperPropertyGet node) =>
       _notAConstantExpression(node);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Constant visitAbstractSuperPropertySet(AbstractSuperPropertySet node) =>
       _notAConstantExpression(node);
 
@@ -5126,12 +5259,14 @@
       _notAConstantExpression(node);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Constant visitSwitchExpression(SwitchExpression node) {
     return createExpressionErrorConstant(
         node, templateNotConstantExpression.withArguments('Switch expression'));
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Constant visitPatternAssignment(PatternAssignment node) {
     return createExpressionErrorConstant(node,
         templateNotConstantExpression.withArguments('Pattern assignment'));
@@ -5153,6 +5288,7 @@
   Constant evaluate(Expression expr) => expr.accept(exprEvaluator);
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExecutionStatus visitAssertBlock(AssertBlock node) {
     if (!exprEvaluator.enableAsserts) return const ProceedStatus();
     throw new UnsupportedError(
@@ -5195,6 +5331,7 @@
     } while (condition is BoolConstant && condition.value);
 
     if (condition is AbortConstant) {
+      // Coverage-ignore-block(suite): Not run.
       return new AbortStatus(condition);
     }
     assert(condition is BoolConstant);
@@ -5220,6 +5357,7 @@
   ExecutionStatus visitIfStatement(IfStatement node) {
     Constant condition = evaluate(node.condition);
     if (condition is AbortConstant) {
+      // Coverage-ignore-block(suite): Not run.
       return new AbortStatus(condition);
     }
     assert(condition is BoolConstant);
@@ -5259,6 +5397,7 @@
     }
 
     if (condition is AbortConstant) {
+      // Coverage-ignore-block(suite): Not run.
       return new AbortStatus(condition);
     }
     assert(condition is BoolConstant);
@@ -5295,6 +5434,7 @@
   ExecutionStatus visitSwitchStatement(SwitchStatement node) {
     final Constant value = evaluate(node.expression);
     if (value is AbortConstant) {
+      // Coverage-ignore-block(suite): Not run.
       return new AbortStatus(value);
     }
 
@@ -5388,6 +5528,7 @@
       condition = evaluate(node.condition);
     }
     if (condition is AbortConstant) {
+      // Coverage-ignore-block(suite): Not run.
       return new AbortStatus(condition);
     }
     assert(condition is BoolConstant);
@@ -5395,12 +5536,14 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExecutionStatus visitForInStatement(ForInStatement node) {
     return new AbortStatus(exprEvaluator.createEvaluationErrorConstant(
         node, templateConstEvalError.withArguments('For-in statement.')));
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExecutionStatus visitIfCaseStatement(IfCaseStatement node) {
     return new AbortStatus(exprEvaluator.createEvaluationErrorConstant(
         node, templateConstEvalError.withArguments('If-case statement.')));
@@ -5413,6 +5556,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExecutionStatus visitPatternVariableDeclaration(
       PatternVariableDeclaration node) {
     return new AbortStatus(exprEvaluator.createEvaluationErrorConstant(node,
@@ -5420,6 +5564,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExecutionStatus visitYieldStatement(YieldStatement node) {
     return new AbortStatus(exprEvaluator.createEvaluationErrorConstant(
         node, templateConstEvalError.withArguments('Yield statement.')));
@@ -5558,6 +5703,7 @@
   /// The unevaluated constants of variables that were never read.
   Iterable<UnevaluatedConstant> get unevaluatedUnreadConstants {
     if (_unreadUnevaluatedVariables.isEmpty) return const [];
+    // Coverage-ignore(suite): Not run.
     return _unreadUnevaluatedVariables.map<UnevaluatedConstant>(
         (VariableDeclaration variable) =>
             _variables[variable]!.value as UnevaluatedConstant);
@@ -5580,6 +5726,7 @@
   @override
   TreeNode visitFileUriExpression(FileUriExpression node) {
     if (node.fileUri == currentFileUri) {
+      // Coverage-ignore-block(suite): Not run.
       return node.expression.accept(this);
     } else {
       Uri? oldFileUri = currentFileUri;
@@ -5898,6 +6045,7 @@
   void report(LocatedMessage message, [List<LocatedMessage>? context]);
 }
 
+// Coverage-ignore(suite): Not run.
 class SimpleErrorReporter implements ErrorReporter {
   const SimpleErrorReporter();
 
diff --git a/pkg/front_end/lib/src/kernel/constant_int_folder.dart b/pkg/front_end/lib/src/kernel/constant_int_folder.dart
index 43fc143..17393ad 100644
--- a/pkg/front_end/lib/src/kernel/constant_int_folder.dart
+++ b/pkg/front_end/lib/src/kernel/constant_int_folder.dart
@@ -174,6 +174,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int? asInt(Constant constant) {
     if (constant is DoubleConstant && _valueIsInteger(constant.value)) {
       return constant.value.toInt();
diff --git a/pkg/front_end/lib/src/kernel/constructor_tearoff_lowering.dart b/pkg/front_end/lib/src/kernel/constructor_tearoff_lowering.dart
index 9e0af97..36ab5b3 100644
--- a/pkg/front_end/lib/src/kernel/constructor_tearoff_lowering.dart
+++ b/pkg/front_end/lib/src/kernel/constructor_tearoff_lowering.dart
@@ -91,6 +91,7 @@
               declarationConstructor.isFactory) ||
           (declarationConstructor is Procedure &&
               declarationConstructor.isStatic),
+      // Coverage-ignore(suite): Not run.
       "Unexpected constructor tear off target $declarationConstructor "
       "(${declarationConstructor.runtimeType}).");
   assert(
@@ -99,6 +100,7 @@
               declarationConstructor.isFactory) ||
           (declarationConstructor is Procedure &&
               declarationConstructor.isStatic),
+      // Coverage-ignore(suite): Not run.
       "Unexpected constructor tear off target $declarationConstructor "
       "(${declarationConstructor.runtimeType}).");
 
@@ -153,6 +155,7 @@
               declarationConstructor.isFactory) ||
           (declarationConstructor is Procedure &&
               declarationConstructor.isStatic),
+      // Coverage-ignore(suite): Not run.
       "Unexpected constructor tear off target $declarationConstructor "
       "(${declarationConstructor.runtimeType}).");
   assert(
@@ -161,6 +164,7 @@
               implementationConstructor.isFactory) ||
           (implementationConstructor is Procedure &&
               implementationConstructor.isStatic),
+      // Coverage-ignore(suite): Not run.
       "Unexpected constructor tear off target $implementationConstructor "
       "(${declarationConstructor.runtimeType}).");
 
@@ -225,6 +229,7 @@
       function,
       substitution,
       libraryBuilder);
+  // Coverage-ignore(suite): Not run.
   delayedDefaultValueCloners?.add(delayedDefaultValueCloner);
   tearOff.function.fileOffset = tearOff.fileOffset;
   tearOff.function.fileEndOffset = tearOff.fileOffset;
@@ -254,7 +259,9 @@
   if (!freshTypeParameters.substitution.isEmpty) {
     if (typeArguments.length != typeParameters.length) {
       // Error case: Use default types as type arguments.
-      typeArguments = new List<DartType>.generate(typeParameters.length,
+      typeArguments = new List<DartType>.generate(
+          typeParameters.length,
+          // Coverage-ignore(suite): Not run.
           (int index) => typeParameters[index].defaultType);
     }
     if (typeArguments.isNotEmpty) {
@@ -423,6 +430,7 @@
           Expression targetTearOff;
           if (target is Constructor ||
               target is Procedure && target.isFactory) {
+            // Coverage-ignore-block(suite): Not run.
             targetTearOff = new ConstructorTearOff(target!);
           } else {
             targetTearOff = new StaticTearOff(target as Procedure);
diff --git a/pkg/front_end/lib/src/kernel/exhaustiveness.dart b/pkg/front_end/lib/src/kernel/exhaustiveness.dart
index 7295375..3524704 100644
--- a/pkg/front_end/lib/src/kernel/exhaustiveness.dart
+++ b/pkg/front_end/lib/src/kernel/exhaustiveness.dart
@@ -35,6 +35,7 @@
   Map<Node, ExhaustivenessResult> switchResults = {};
 }
 
+// Coverage-ignore(suite): Not run.
 class ExhaustivenessResult {
   final StaticType scrutineeType;
   final List<Space> caseSpaces;
@@ -73,7 +74,9 @@
   @override
   bool isNullType(DartType type) {
     return type is NullType ||
-        (type is NeverType && type.nullability == Nullability.nullable);
+        (type is NeverType &&
+            // Coverage-ignore(suite): Not run.
+            type.nullability == Nullability.nullable);
   }
 
   @override
@@ -112,6 +115,7 @@
       _typeEnvironment.objectNonNullableRawType;
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get nullableObjectType => _typeEnvironment.objectNullableRawType;
 
   @override
@@ -151,6 +155,7 @@
       }
       return fieldTypes;
     } else if (type is ExtensionType) {
+      // Coverage-ignore-block(suite): Not run.
       ExtensionTypeDeclaration extensionTypeDeclaration =
           type.extensionTypeDeclaration;
       Map<Key, DartType> fieldTypes = {};
@@ -291,11 +296,17 @@
   @override
   bool hasSimpleName(DartType type) {
     return type is InterfaceType ||
+        // Coverage-ignore(suite): Not run.
         type is DynamicType ||
+        // Coverage-ignore(suite): Not run.
         type is VoidType ||
+        // Coverage-ignore(suite): Not run.
         type is NeverType ||
+        // Coverage-ignore(suite): Not run.
         type is NullType ||
+        // Coverage-ignore(suite): Not run.
         type is ExtensionType ||
+        // Coverage-ignore(suite): Not run.
         // TODO(johnniwinther): What about intersection types?
         type is TypeParameterType;
   }
@@ -435,6 +446,7 @@
           //    class Class extends _Super&Mixin {}
           //
           if (superclass.mixedInClass == sealedClass) {
+            // Coverage-ignore-block(suite): Not run.
             list.add(cls);
             continue outer;
           }
@@ -470,6 +482,7 @@
     if (thisType.typeArguments.isEmpty) {
       return thisType;
     }
+    // Coverage-ignore-block(suite): Not run.
     bool trivialSubstitution = true;
     if (thisType.typeArguments.length == asSealedType.typeArguments.length) {
       for (int i = 0; i < thisType.typeArguments.length; i++) {
@@ -649,6 +662,7 @@
           hasExplicitTypeArguments:
               pattern.keyType != null && pattern.valueType != null);
     }
+    // Coverage-ignore-block(suite): Not run.
     assert(false, "Unexpected pattern $pattern (${pattern.runtimeType}).");
     return createUnknownSpace(path);
   }
@@ -666,12 +680,17 @@
         return new Space(path, cache.getBoolValueStaticType(constant.value));
       } else if (constant is RecordConstant) {
         Map<Key, Space> properties = {};
-        for (int index = 0; index < constant.positional.length; index++) {
+        for (int index = 0;
+            index < constant.positional.length;
+            // Coverage-ignore(suite): Not run.
+            index++) {
+          // Coverage-ignore-block(suite): Not run.
           Key key = new RecordIndexKey(index);
           properties[key] = convertConstantToSpace(constant.positional[index],
               path: path.add(key));
         }
         for (MapEntry<String, Constant> entry in constant.named.entries) {
+          // Coverage-ignore-block(suite): Not run.
           Key key = new RecordNameKey(entry.key);
           properties[key] =
               convertConstantToSpace(entry.value, path: path.add(key));
@@ -689,6 +708,7 @@
         return new Space(path, cache.getUnknownStaticType());
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       // TODO(johnniwinther): Assert that constant value is available when the
       // exhaustiveness checking is complete.
       return new Space(path, cache.getUnknownStaticType());
@@ -743,11 +763,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitFunctionType(FunctionType type, CoreTypes coreTypes) {
     return false;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitFutureOrType(FutureOrType type, CoreTypes coreTypes) {
     return type.typeArgument.accept1(this, coreTypes);
   }
@@ -786,11 +808,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitNullType(NullType type, CoreTypes coreTypes) {
     return true;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitRecordType(RecordType type, CoreTypes coreTypes) {
     for (DartType positional in type.positional) {
       if (!positional.accept1(this, coreTypes)) {
@@ -811,17 +835,20 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitStructuralParameterType(
       StructuralParameterType type, CoreTypes coreTypes) {
     return type.bound.accept1(this, coreTypes);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitTypedefType(TypedefType type, CoreTypes coreTypes) {
     return type.unalias.accept1(this, coreTypes);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitVoidType(VoidType type, CoreTypes coreTypes) {
     return false;
   }
@@ -831,6 +858,7 @@
   const TypeParameterReplacer();
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType? visitTypeParameterType(TypeParameterType node, Variance variance) {
     DartType replacement = super.visitTypeParameterType(node, variance) ?? node;
     if (replacement is TypeParameterType) {
diff --git a/pkg/front_end/lib/src/kernel/expression_generator.dart b/pkg/front_end/lib/src/kernel/expression_generator.dart
index d55352f..bd8b5f2 100644
--- a/pkg/front_end/lib/src/kernel/expression_generator.dart
+++ b/pkg/front_end/lib/src/kernel/expression_generator.dart
@@ -206,6 +206,7 @@
     } else {
       if (_helper.constantContext != ConstantContext.none &&
           selector.name != lengthName) {
+        // Coverage-ignore-block(suite): Not run.
         _helper.addProblem(
             messageNotAConstantExpression, fileOffset, token.length);
       }
@@ -312,10 +313,13 @@
 
   VariableUseGenerator(
       ExpressionGeneratorHelper helper, Token token, this.variable)
-      : assert(variable.isAssignable, 'Variable $variable is not assignable'),
+      : assert(
+            variable.isAssignable, // Coverage-ignore(suite): Not run.
+            'Variable $variable is not assignable'),
         super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "VariableUseGenerator";
 
   @override
@@ -399,6 +403,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     NameSystem syntheticNames = new NameSystem();
     sink.write(", variable: ");
@@ -428,6 +433,7 @@
       : super(helper, token, variable);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ForInLateFinalVariableUseGenerator";
 
   @override
@@ -474,6 +480,7 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "PropertyAccessGenerator";
 
   @override
@@ -487,6 +494,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     NameSystem syntheticNames = new NameSystem();
     sink.write(", receiver: ");
@@ -564,6 +572,7 @@
   static Generator make(ExpressionGeneratorHelper helper, Token token,
       Expression receiver, Name name, bool isNullAware) {
     if (helper.forest.isThisExpression(receiver)) {
+      // Coverage-ignore-block(suite): Not run.
       return new ThisPropertyAccessGenerator(helper, token, name,
           thisVariable: null,
           thisOffset: receiver.fileOffset,
@@ -624,6 +633,7 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ThisPropertyAccessGenerator";
 
   @override
@@ -707,6 +717,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", name: ");
     sink.write(name.text);
@@ -727,9 +738,11 @@
         super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "NullAwarePropertyAccessGenerator";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => name.text;
 
   @override
@@ -796,6 +809,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression doInvocation(
       int offset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -810,6 +824,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     NameSystem syntheticNames = new NameSystem();
     sink.write(", receiver: ");
@@ -833,9 +848,11 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "SuperPropertyAccessGenerator";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => name.text;
 
   @override
@@ -905,6 +922,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression doInvocation(
       int offset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -933,6 +951,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", name: ");
     sink.write(name.text);
@@ -956,9 +975,11 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => "[]";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "IndexedAccessGenerator";
 
   @override
@@ -1067,6 +1088,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression doInvocation(
       int offset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -1082,6 +1104,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     NameSystem syntheticNames = new NameSystem();
     sink.write(", receiver: ");
@@ -1095,6 +1118,7 @@
       Expression receiver, Expression index,
       {required bool isNullAware}) {
     if (helper.forest.isThisExpression(receiver)) {
+      // Coverage-ignore-block(suite): Not run.
       return new ThisIndexedAccessGenerator(helper, token, index,
           thisOffset: receiver.fileOffset, isNullAware: isNullAware);
     } else {
@@ -1118,9 +1142,11 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => "[]";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ThisIndexedAccessGenerator";
 
   @override
@@ -1172,6 +1198,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression doInvocation(
       int offset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -1180,6 +1207,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -1187,6 +1215,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     NameSystem syntheticNames = new NameSystem();
     sink.write(", index: ");
@@ -1206,9 +1235,11 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => "[]";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "SuperIndexedAccessGenerator";
 
   @override
@@ -1304,6 +1335,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -1311,6 +1343,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     NameSystem syntheticNames = new NameSystem();
     sink.write(", index: ");
@@ -1417,6 +1450,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "StaticAccessGenerator";
 
   @override
@@ -1524,6 +1558,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", targetName: ");
     sink.write(targetName);
@@ -1624,7 +1659,9 @@
         assert(!getterBuilder.isStatic);
         readTarget = getterBuilder.readTarget as Procedure?;
         invokeTarget = getterBuilder.invokeTarget as Procedure?;
-      } else if (getterBuilder.isOperator) {
+      }
+      // Coverage-ignore(suite): Not run.
+      else if (getterBuilder.isOperator) {
         assert(!getterBuilder.isStatic);
         invokeTarget = getterBuilder.invokeTarget as Procedure?;
       } else {
@@ -1640,6 +1677,7 @@
       if (setterBuilder.isSetter) {
         assert(!setterBuilder.isStatic);
         writeTarget = setterBuilder.writeTarget as Procedure?;
+        // Coverage-ignore-block(suite): Not run.
         targetName ??= setterBuilder.name;
       } else {
         return unhandled(
@@ -1662,6 +1700,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "InstanceExtensionAccessGenerator";
 
   @override
@@ -1798,6 +1837,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -1805,6 +1845,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", targetName: ");
     sink.write(targetName);
@@ -1918,6 +1959,7 @@
     if (getterBuilder != null) {
       assert(!getterBuilder.isStatic);
       if (getterBuilder is AccessErrorBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         AccessErrorBuilder error = getterBuilder;
         getterBuilder = error.builder;
         // We should only see an access error here if we've looked up a setter
@@ -1985,6 +2027,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ExplicitExtensionIndexedAccessGenerator";
 
   @override
@@ -2056,6 +2099,7 @@
       {required bool forEffect}) {
     Expression write;
     if (writeTarget == null) {
+      // Coverage-ignore-block(suite): Not run.
       write = _makeInvalidWrite(value);
     } else {
       write = new ExtensionSet(
@@ -2223,6 +2267,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", targetName: ");
     sink.write(targetName);
@@ -2296,6 +2341,7 @@
     Procedure? readTarget;
     if (getterBuilder != null) {
       if (getterBuilder is AccessErrorBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         AccessErrorBuilder error = getterBuilder;
         getterBuilder = error.builder;
         // We should only see an access error here if we've looked up a setter
@@ -2336,14 +2382,17 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => "[]";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ExplicitExtensionIndexedAccessGenerator";
 
   @override
   Expression buildSimpleRead() {
     if (readTarget == null) {
+      // Coverage-ignore-block(suite): Not run.
       return _makeInvalidRead(UnresolvedKind.Method);
     }
     VariableDeclarationImpl? variable;
@@ -2374,6 +2423,7 @@
   @override
   Expression buildAssignment(Expression value, {bool voidContext = false}) {
     if (writeTarget == null) {
+      // Coverage-ignore-block(suite): Not run.
       return _makeInvalidWrite(value);
     }
     VariableDeclarationImpl? variable;
@@ -2485,6 +2535,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression doInvocation(
       int offset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -2500,6 +2551,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     NameSystem syntheticNames = new NameSystem();
     sink.write(", index: ");
@@ -2548,12 +2600,14 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead {
     return unsupported(
         "ExplicitExtensionAccessGenerator.plainNameForRead", fileOffset, _uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ExplicitExtensionAccessGenerator";
 
   @override
@@ -2562,11 +2616,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildAssignment(Expression value, {bool voidContext = false}) {
     return _makeInvalidWrite(value);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     return _makeInvalidRead();
@@ -2624,6 +2680,7 @@
       Selector selector, int operatorOffset, bool isNullAware) {
     selector.reportNewAsSelector();
     if (_helper.constantContext != ConstantContext.none) {
+      // Coverage-ignore-block(suite): Not run.
       _helper.addProblem(
           messageNotAConstantExpression, fileOffset, token.length);
     }
@@ -2671,6 +2728,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression _makeInvalidWrite(Expression value) {
     return _helper.buildProblem(
         messageExplicitExtensionAsLvalue, fileOffset, lengthForToken(token));
@@ -2682,6 +2740,7 @@
     Builder? getter = extensionBuilder.lookupLocalMemberByName(indexGetName);
     Builder? setter = extensionBuilder.lookupLocalMemberByName(indexSetName);
     if (getter == null && setter == null) {
+      // Coverage-ignore-block(suite): Not run.
       return new UnresolvedNameGenerator(_helper, token, indexGetName,
           unresolvedReadKind: UnresolvedKind.Method);
     }
@@ -2704,6 +2763,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", extensionBuilder: ");
     sink.write(extensionBuilder);
@@ -2720,9 +2780,11 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => 'loadLibrary';
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "LoadLibraryGenerator";
 
   @override
@@ -2735,11 +2797,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildAssignment(Expression value, {bool voidContext = false}) {
     return _makeInvalidWrite(value);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     Expression read = buildSimpleRead();
@@ -2749,6 +2813,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildCompoundAssignment(Name binaryOperator, Expression value,
       {int offset = TreeNode.noOffset,
       bool voidContext = false,
@@ -2760,6 +2825,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPostfixIncrement(Name binaryOperator,
       {int offset = TreeNode.noOffset, bool voidContext = false}) {
     Expression value = _forest.createIntLiteral(offset, 1);
@@ -2773,6 +2839,7 @@
       {bool isTypeArgumentsInForest = false}) {
     if (_forest.argumentsPositional(arguments).length > 0 ||
         _forest.argumentsNamed(arguments).length > 0) {
+      // Coverage-ignore-block(suite): Not run.
       _helper.addProblemErrorIfConst(
           messageLoadLibraryTakesNoArguments, offset, 'loadLibrary'.length);
     }
@@ -2780,6 +2847,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -2787,6 +2855,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", builder: ");
     sink.write(builder);
@@ -2817,6 +2886,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     return _helper.wrapInDeferredCheck(
@@ -2827,6 +2897,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildCompoundAssignment(Name binaryOperator, Expression value,
       {int offset = TreeNode.noOffset,
       bool voidContext = false,
@@ -2843,6 +2914,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPostfixIncrement(Name binaryOperator,
       {int offset = TreeNode.noOffset, bool voidContext = false}) {
     return _helper.wrapInDeferredCheck(
@@ -2869,11 +2941,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead {
     return unsupported("deferredAccessor.plainNameForRead", fileOffset, _uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "DeferredAccessGenerator";
 
   @override
@@ -2890,6 +2964,7 @@
     LocatedMessage message;
     if (type is NamedTypeBuilder &&
         type.declaration is InvalidTypeDeclarationBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       InvalidTypeDeclarationBuilder declaration =
           type.declaration as InvalidTypeDeclarationBuilder;
       message = declaration.message;
@@ -2943,6 +3018,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -2950,6 +3026,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", prefixGenerator: ");
     sink.write(prefixGenerator);
@@ -3000,6 +3077,7 @@
   String get targetName => typeName.name;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "TypeUseGenerator";
 
   @override
@@ -3008,6 +3086,7 @@
       {required bool allowPotentiallyConstantType,
       required bool performTypeCanonicalization}) {
     if (declaration is OmittedTypeDeclarationBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       // TODO(johnniwinther): Report errors when this occurs in-body or with
       // type arguments.
       // TODO(johnniwinther): Handle nullability.
@@ -3044,6 +3123,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", declaration: ");
     sink.write(declaration);
@@ -3099,11 +3179,17 @@
                 ClassBuilder() => true,
                 ExtensionBuilder() => false,
                 ExtensionTypeDeclarationBuilder() => true,
+                // Coverage-ignore(suite): Not run.
                 TypeAliasBuilder() => false,
+                // Coverage-ignore(suite): Not run.
                 NominalVariableBuilder() => false,
+                // Coverage-ignore(suite): Not run.
                 StructuralVariableBuilder() => false,
+                // Coverage-ignore(suite): Not run.
                 InvalidTypeDeclarationBuilder() => false,
+                // Coverage-ignore(suite): Not run.
                 BuiltinTypeDeclarationBuilder() => false,
+                // Coverage-ignore(suite): Not run.
                 // TODO(johnniwinther): How should we handle this case?
                 OmittedTypeDeclarationBuilder() => false,
                 null => false,
@@ -3116,6 +3202,7 @@
           .toList();
       if (aliasedTypeArguments != null &&
           aliasedTypeArguments.length != aliasBuilder.typeVariablesCount) {
+        // Coverage-ignore-block(suite): Not run.
         _helper.libraryBuilder.addProblem(
             templateTypeArgumentMismatch
                 .withArguments(aliasBuilder.typeVariablesCount),
@@ -3176,6 +3263,7 @@
         if (send is PropertySelector) {
           assert(
               send.typeArguments == null,
+              // Coverage-ignore(suite): Not run.
               "Unexpected non-null typeArguments of "
               "an IncompletePropertyAccessGenerator object: "
               "'${send.typeArguments.runtimeType}'.");
@@ -3232,11 +3320,13 @@
                           in declarationBuilder.cls.typeParameters) {
                         builtTypeArguments.add(typeParameter.defaultType);
                       }
+                    // Coverage-ignore(suite): Not run.
                     case ExtensionTypeDeclarationBuilder():
                       for (TypeParameter typeParameter in declarationBuilder
                           .extensionTypeDeclaration.typeParameters) {
                         builtTypeArguments.add(typeParameter.defaultType);
                       }
+                    // Coverage-ignore(suite): Not run.
                     case ExtensionBuilder():
                       throw new UnsupportedError(
                           "Unexpected declaration $declarationBuilder");
@@ -3266,6 +3356,7 @@
                         name.text, nameOffset, _uri, _helper.libraryBuilder);
                 if (tearOffLowering != null) {
                   if (tearOffLowering.isFactory) {
+                    // Coverage-ignore-block(suite): Not run.
                     return _helper.forest.createConstructorTearOff(
                         token.charOffset, tearOffLowering);
                   } else {
@@ -3367,6 +3458,7 @@
               offsetForToken(send.token), send.typeArguments, arguments,
               isTypeArgumentsInForest: send.isTypeArgumentsInForest);
     } else {
+      // Coverage-ignore-block(suite): Not run.
       // `SomeType?.toString` is the same as `SomeType.toString`, not
       // `(SomeType).toString`.
       return super.buildSelectorAccess(send, operatorOffset, isNullAware);
@@ -3479,6 +3571,7 @@
   Expression get expression;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ReadOnlyAccessGenerator";
 
   @override
@@ -3571,6 +3664,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     NameSystem syntheticNames = new NameSystem();
     sink.write(", expression: ");
@@ -3592,6 +3686,7 @@
       required UnresolvedKind kind,
       int? charOffset});
 
+  // Coverage-ignore(suite): Not run.
   Name get name => unsupported("name", fileOffset, _uri);
 
   @override
@@ -3605,6 +3700,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression_Generator_Initializer doInvocation(
       int offset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -3620,11 +3716,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildAssignment(Expression value, {bool voidContext = false}) {
     return buildError(rhs: value, kind: UnresolvedKind.Setter);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildCompoundAssignment(Name binaryOperator, Expression value,
       {int offset = -1,
       bool voidContext = false,
@@ -3654,22 +3752,26 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     return buildError(rhs: value, kind: UnresolvedKind.Setter);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildSimpleRead() {
     return buildError(kind: UnresolvedKind.Member);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression _makeInvalidRead(UnresolvedKind unresolvedKind) {
     return buildError(kind: unresolvedKind);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression _makeInvalidWrite(Expression value) {
     return buildError(rhs: value, kind: UnresolvedKind.Setter);
   }
@@ -3695,6 +3797,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -3723,6 +3826,7 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "UnresolvedNameGenerator";
 
   @override
@@ -3771,6 +3875,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", name: ");
     sink.write(name.text);
@@ -3797,11 +3902,13 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead {
     return unsupported("plainNameForRead", token.charOffset, _helper.uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Never doInvocation(
       int charOffset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -3809,17 +3916,20 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildAssignment(Expression value, {bool voidContext = false}) {
     return _makeInvalidWrite(value);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     return _makeInvalidWrite(value);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildCompoundAssignment(Name binaryOperator, Expression value,
       {int offset = -1,
       bool voidContext = false,
@@ -3829,29 +3939,34 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPrefixIncrement(Name binaryOperator,
       {int offset = -1, bool voidContext = false}) {
     return _makeInvalidWrite(null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPostfixIncrement(Name binaryOperator,
       {int offset = -1, bool voidContext = false}) {
     return _makeInvalidWrite(null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Never _makeInvalidRead([UnresolvedKind? unresolvedKind]) {
     return unsupported("makeInvalidRead", token.charOffset, _helper.uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression _makeInvalidWrite(Expression? value) {
     return _helper.buildProblem(messageIllegalAssignmentToNonAssignable,
         fileOffset, lengthForToken(token));
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -3869,6 +3984,7 @@
       : super(helper, token, generator);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "DelayedAssignment";
 
   @override
@@ -3898,18 +4014,22 @@
       return generator.buildCompoundAssignment(multiplyName, value,
           offset: fileOffset, voidContext: voidContext);
     } else if (identical("%=", assignmentOperator)) {
+      // Coverage-ignore-block(suite): Not run.
       return generator.buildCompoundAssignment(percentName, value,
           offset: fileOffset, voidContext: voidContext);
     } else if (identical("&=", assignmentOperator)) {
       return generator.buildCompoundAssignment(ampersandName, value,
           offset: fileOffset, voidContext: voidContext);
     } else if (identical("/=", assignmentOperator)) {
+      // Coverage-ignore-block(suite): Not run.
       return generator.buildCompoundAssignment(divisionName, value,
           offset: fileOffset, voidContext: voidContext);
     } else if (identical("<<=", assignmentOperator)) {
+      // Coverage-ignore-block(suite): Not run.
       return generator.buildCompoundAssignment(leftShiftName, value,
           offset: fileOffset, voidContext: voidContext);
     } else if (identical(">>=", assignmentOperator)) {
+      // Coverage-ignore-block(suite): Not run.
       return generator.buildCompoundAssignment(rightShiftName, value,
           offset: fileOffset, voidContext: voidContext);
     } else if (identical(">>>=", assignmentOperator)) {
@@ -3919,7 +4039,9 @@
       return generator.buildIfNullAssignment(
           value, const DynamicType(), fileOffset,
           voidContext: voidContext);
-    } else if (identical("^=", assignmentOperator)) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (identical("^=", assignmentOperator)) {
       return generator.buildCompoundAssignment(caretName, value,
           offset: fileOffset, voidContext: voidContext);
     } else if (identical("|=", assignmentOperator)) {
@@ -3945,6 +4067,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", value: ");
     printNodeOn(value, sink);
@@ -3961,6 +4084,7 @@
       : super(helper, token, generator);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "DelayedPostfixIncrement";
 
   @override
@@ -3976,6 +4100,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", binaryOperator: ");
     sink.write(binaryOperator.text);
@@ -3992,6 +4117,7 @@
   String get _plainNameForRead => prefix.name;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "PrefixUseGenerator";
 
   @override
@@ -4003,12 +4129,14 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     return _makeInvalidRead();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildCompoundAssignment(Name binaryOperator, Expression value,
       {int offset = TreeNode.noOffset,
       bool voidContext = false,
@@ -4018,6 +4146,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPostfixIncrement(Name binaryOperator,
       {int offset = TreeNode.noOffset, bool voidContext = false}) {
     return _makeInvalidRead();
@@ -4026,6 +4155,7 @@
   @override
   /* Expression | Generator */ Object qualifiedLookup(Token nameToken) {
     if (_helper.constantContext != ConstantContext.none && prefix.deferred) {
+      // Coverage-ignore-block(suite): Not run.
       _helper.addProblem(
           templateCantUseDeferredPrefixAsConstant.withArguments(token),
           fileOffset,
@@ -4040,6 +4170,7 @@
               new DeferredAccessGenerator(_helper, nameToken, this, result);
         }
       } else {
+        // Coverage-ignore-block(suite): Not run.
         _helper.wrapInDeferredCheck(result as Expression, prefix, fileOffset);
       }
     }
@@ -4060,7 +4191,9 @@
   @override
   Expression_Generator buildSelectorAccess(
       Selector selector, int operatorOffset, bool isNullAware) {
-    assert(selector.name.text == selector.token.lexeme,
+    assert(
+        selector.name.text == selector.token.lexeme,
+        // Coverage-ignore(suite): Not run.
         "'${selector.name.text}' != ${selector.token.lexeme}");
     selector.reportNewAsSelector();
     Object result = qualifiedLookup(selector.token);
@@ -4088,6 +4221,7 @@
   Expression _makeInvalidWrite(Expression value) => _makeInvalidRead();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -4095,6 +4229,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", prefix: ");
     sink.write(prefix.name);
@@ -4117,23 +4252,28 @@
       "${prefixGenerator._plainNameForRead}.${token.lexeme}";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "UnexpectedQualifiedUseGenerator";
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildSimpleRead() => _makeInvalidRead(UnresolvedKind.Member);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildAssignment(Expression value, {bool voidContext = false}) {
     return _makeInvalidWrite(value);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     return _makeInvalidRead(UnresolvedKind.Member);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildCompoundAssignment(Name binaryOperator, Expression value,
       {int offset = TreeNode.noOffset,
       bool voidContext = false,
@@ -4143,12 +4283,14 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPostfixIncrement(Name binaryOperator,
       {int offset = TreeNode.noOffset, bool voidContext = false}) {
     return _makeInvalidRead(UnresolvedKind.Member);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression doInvocation(
       int offset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -4180,6 +4322,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -4187,6 +4330,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", prefixGenerator: ");
     prefixGenerator.printOn(sink);
@@ -4201,12 +4345,15 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => "#parser-error";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ParserErrorGenerator";
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {}
 
   Expression buildProblem() {
@@ -4223,12 +4370,14 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     return buildProblem();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildCompoundAssignment(Name binaryOperator, Expression value,
       {int offset = TreeNode.noOffset,
       bool voidContext = false,
@@ -4238,22 +4387,26 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPrefixIncrement(Name binaryOperator,
       {int offset = TreeNode.noOffset, bool voidContext = false}) {
     return buildProblem();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPostfixIncrement(Name binaryOperator,
       {int offset = TreeNode.noOffset, bool voidContext = false}) {
     return buildProblem();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression _makeInvalidRead([UnresolvedKind? unresolvedKind]) =>
       buildProblem();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression _makeInvalidWrite(Expression value) => buildProblem();
 
   @override
@@ -4262,6 +4415,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression doInvocation(
       int offset, List<TypeBuilder>? typeArguments, Arguments arguments,
       {bool isTypeArgumentsInForest = false}) {
@@ -4269,6 +4423,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildSelectorAccess(
       Selector send, int operatorOffset, bool isNullAware) {
     return buildProblem();
@@ -4296,6 +4451,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression invokeConstructor(
       List<TypeBuilder>? typeArguments,
       String name,
@@ -4308,6 +4464,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Generator buildIndexedAccess(Expression index, Token token,
       {required bool isNullAware}) {
     return new IndexedAccessGenerator(_helper, token, buildSimpleRead(), index,
@@ -4381,12 +4538,14 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead {
     return unsupported(
         "${isSuper ? 'super' : 'this'}.plainNameForRead", fileOffset, _uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ThisAccessGenerator";
 
   @override
@@ -4500,6 +4659,7 @@
       }
       return result;
     }
+    // Coverage-ignore(suite): Not run.
     return super.buildEqualsOperation(token, right, isNot: isNot);
   }
 
@@ -4511,6 +4671,7 @@
       return _helper.buildSuperInvocation(binaryName,
           _forest.createArguments(offset, <Expression>[right]), offset);
     }
+    // Coverage-ignore(suite): Not run.
     return super.buildBinaryOperation(token, binaryName, right);
   }
 
@@ -4521,6 +4682,7 @@
       return _helper.buildSuperInvocation(
           unaryName, _forest.createArgumentsEmpty(offset), offset);
     }
+    // Coverage-ignore(suite): Not run.
     return super.buildUnaryOperation(token, unaryName);
   }
 
@@ -4552,17 +4714,20 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildAssignment(Expression value, {bool voidContext = false}) {
     return buildAssignmentError();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildIfNullAssignment(Expression value, DartType type, int offset,
       {bool voidContext = false}) {
     return buildAssignmentError();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildCompoundAssignment(Name binaryOperator, Expression value,
       {int offset = TreeNode.noOffset,
       bool voidContext = false,
@@ -4572,12 +4737,14 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPrefixIncrement(Name binaryOperator,
       {int offset = TreeNode.noOffset, bool voidContext = false}) {
     return buildAssignmentError();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Expression buildPostfixIncrement(Name binaryOperator,
       {int offset = TreeNode.noOffset, bool voidContext = false}) {
     return buildAssignmentError();
@@ -4599,6 +4766,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   Expression buildAssignmentError() {
     return _helper.buildProblem(
         isSuper ? messageCannotAssignToSuper : messageNotAnLvalue,
@@ -4607,6 +4775,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", isInitializer: ");
     sink.write(isInitializer);
@@ -4627,9 +4796,11 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead => token.lexeme;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "IncompleteErrorGenerator";
 
   @override
@@ -4660,6 +4831,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", message: ");
     sink.write(message.code.name);
@@ -4700,6 +4872,7 @@
       _helper.forest.createParenthesized(expression.fileOffset, expression);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "ParenthesizedExpressionGenerator";
 
   @override
@@ -4713,7 +4886,9 @@
           isConstantExpression: selector.isPotentiallyConstant);
     } else {
       if (_helper.constantContext != ConstantContext.none &&
+          // Coverage-ignore(suite): Not run.
           selector.name != lengthName) {
+        // Coverage-ignore-block(suite): Not run.
         _helper.addProblem(
             messageNotAConstantExpression, fileOffset, token.length);
       }
@@ -4767,6 +4942,7 @@
 
   List<TypeBuilder>? get typeArguments => null;
 
+  // Coverage-ignore(suite): Not run.
   bool get isTypeArgumentsInForest => true;
 
   Arguments? get arguments => null;
@@ -4827,6 +5003,7 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => 'InvocationSelector';
 
   @override
@@ -4842,6 +5019,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", name: ");
     sink.write(name.text);
@@ -4870,6 +5048,7 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => 'PropertySelector';
 
   @override
@@ -4884,6 +5063,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", name: ");
     sink.write(name.text);
@@ -4898,9 +5078,11 @@
       : super(helper, token);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _debugName => "AugmentSuperGenerator";
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get _plainNameForRead {
     return unsupported("augment super.plainNameForRead", fileOffset, _uri);
   }
@@ -4982,6 +5164,7 @@
       return buildCompoundAssignment(binaryOperator, value,
           offset: offset, voidContext: voidContext, isPostIncDec: true);
     }
+    // Coverage-ignore-block(suite): Not run.
     VariableDeclarationImpl read =
         _helper.createVariableDeclarationForValue(_createRead());
     Expression binary = _helper.forest.createBinary(offset,
@@ -5011,6 +5194,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void printOn(StringSink sink) {
     sink.write(", augmentSuperTarget: ");
     sink.write(augmentSuperTarget);
diff --git a/pkg/front_end/lib/src/kernel/forest.dart b/pkg/front_end/lib/src/kernel/forest.dart
index 8725f26..6853223 100644
--- a/pkg/front_end/lib/src/kernel/forest.dart
+++ b/pkg/front_end/lib/src/kernel/forest.dart
@@ -446,7 +446,12 @@
       Expression? condition,
       List<Expression> updaters,
       Statement body) {
-    return new ForStatement(variables ?? [], condition, updaters, body)
+    return new ForStatement(
+        variables ?? // Coverage-ignore(suite): Not run.
+            [],
+        condition,
+        updaters,
+        body)
       ..fileOffset = fileOffset;
   }
 
@@ -582,14 +587,17 @@
 
   bool isErroneousNode(Object? node) {
     if (node is ExpressionStatement) {
+      // Coverage-ignore-block(suite): Not run.
       ExpressionStatement statement = node;
       node = statement.expression;
     }
     if (node is VariableDeclaration) {
+      // Coverage-ignore-block(suite): Not run.
       VariableDeclaration variable = node;
       node = variable.initializer;
     }
     if (node is Let) {
+      // Coverage-ignore-block(suite): Not run.
       Let let = node;
       node = let.variable.initializer;
     }
@@ -713,15 +721,21 @@
   }
 
   ConstructorTearOff createConstructorTearOff(int fileOffset, Member target) {
-    assert(target is Constructor || (target is Procedure && target.isFactory),
+    assert(
+        target is Constructor || (target is Procedure && target.isFactory),
+        // Coverage-ignore(suite): Not run.
         "Unexpected constructor tear off target: $target");
     return new ConstructorTearOff(target)..fileOffset = fileOffset;
   }
 
   StaticTearOff createStaticTearOff(int fileOffset, Procedure procedure) {
-    assert(procedure.kind == ProcedureKind.Method,
+    assert(
+        procedure.kind == ProcedureKind.Method,
+        // Coverage-ignore(suite): Not run.
         "Unexpected static tear off target: $procedure");
-    assert(!procedure.isRedirectingFactory,
+    assert(
+        !procedure.isRedirectingFactory,
+        // Coverage-ignore(suite): Not run.
         "Unexpected static tear off target: $procedure");
     return new StaticTearOff(procedure)..fileOffset = fileOffset;
   }
@@ -902,26 +916,31 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept<R>(v) {
     throw unsupported("accept", fileOffset, uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept1<R, A>(v, arg) {
     throw unsupported("accept1", fileOffset, uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Never visitChildren(v) {
     throw unsupported("visitChildren", fileOffset, uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Never transformChildren(v) {
     throw unsupported("transformChildren", fileOffset, uri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Never transformOrRemoveChildren(v) {
     throw unsupported("transformOrRemoveChildren", fileOffset, uri);
   }
@@ -932,6 +951,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     for (int index = 0; index < declarations.length; index++) {
       if (index > 0) {
diff --git a/pkg/front_end/lib/src/kernel/forwarding_node.dart b/pkg/front_end/lib/src/kernel/forwarding_node.dart
index 269bb4b..7ebfc3b 100644
--- a/pkg/front_end/lib/src/kernel/forwarding_node.dart
+++ b/pkg/front_end/lib/src/kernel/forwarding_node.dart
@@ -97,6 +97,7 @@
     if (_combinedMemberSignature.members.length == 1 &&
         !needMixinStub &&
         !hasNoSuchMethodTarget) {
+      // Coverage-ignore-block(suite): Not run.
       // Optimization: Avoid complex computation for simple scenarios.
 
       // Covariance can only come from [interfaceMember] so we never need a
@@ -214,6 +215,7 @@
               case ProcedureStubKind.ConcreteMixinStub:
                 finalTarget = interfaceMember.stubTarget!;
                 break;
+              // Coverage-ignore(suite): Not run.
               case ProcedureStubKind.RepresentationField:
                 assert(
                     false,
@@ -248,11 +250,14 @@
       return stub;
     } else {
       if (_combinedMemberSignature.needsCovarianceMerging) {
+        // Coverage-ignore-block(suite): Not run.
         _combinedMemberSignature.combinedMemberSignatureCovariance!
             .applyCovariance(interfaceMember);
       }
       if (needsNoSuchMethodForwarder) {
-        assert(interfaceMember is Procedure,
+        assert(
+            interfaceMember is Procedure,
+            // Coverage-ignore(suite): Not run.
             "Unexpected abstract member: ${interfaceMember}");
         (interfaceMember as Procedure).stubKind =
             ProcedureStubKind.NoSuchMethodForwarder;
@@ -297,6 +302,7 @@
     Expression superCall;
     assert(
         !superTarget.isAbstract,
+        // Coverage-ignore(suite): Not run.
         "Abstract super target $superTarget found for '${name}' in "
         "${typeDeclaration}.");
     switch (kind) {
@@ -398,6 +404,7 @@
         }
         superCall = new SuperPropertySet(name, expression, superTarget);
         break;
+      // Coverage-ignore(suite): Not run.
       default:
         unhandled('$kind', '_createForwardingImplIfNeeded', -1, null);
     }
diff --git a/pkg/front_end/lib/src/kernel/hierarchy/class_member.dart b/pkg/front_end/lib/src/kernel/hierarchy/class_member.dart
index e2616cf..30c0576 100644
--- a/pkg/front_end/lib/src/kernel/hierarchy/class_member.dart
+++ b/pkg/front_end/lib/src/kernel/hierarchy/class_member.dart
@@ -64,6 +64,7 @@
       {required this.isDeclaredAsField})
       : assert(
             member.enclosingTypeDeclaration != null,
+            // Coverage-ignore(suite): Not run.
             "Type declaration member without enclosing type "
             "declaration $member.");
 
@@ -89,7 +90,8 @@
   DartType getMemberType(
       ClassMembersBuilder membersBuilder, TypeDeclarationType thisType) {
     DartType type = switch (kind) {
-      ClassMemberKind.Method => member.getterType,
+      ClassMemberKind.Method => // Coverage-ignore(suite): Not run.
+        member.getterType,
       ClassMemberKind.Getter => member.getterType,
       ClassMemberKind.Setter => member.setterType,
     };
@@ -132,7 +134,8 @@
   DartType getMemberType(
       ClassMembersBuilder membersBuilder, TypeDeclarationType thisType) {
     return switch (kind) {
-      ClassMemberKind.Method => member.getterType,
+      ClassMemberKind.Method => // Coverage-ignore(suite): Not run.
+        member.getterType,
       ClassMemberKind.Getter => member.getterType,
       ClassMemberKind.Setter => member.setterType,
     };
@@ -172,6 +175,7 @@
       ClassMembersBuilder membersBuilder, TypeDeclarationType thisType) {
     FunctionType type = member.getterType as FunctionType;
     if (type.typeParameters.isNotEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       type = FunctionTypeInstantiator.instantiate(
           type,
           membersBuilder.hierarchyBuilder.types.getTypeArgumentsAsInstanceOf(
@@ -179,6 +183,7 @@
     }
     switch (kind) {
       case ClassMemberKind.Method:
+        // Coverage-ignore(suite): Not run.
         // For methods [member] is the tear-off so the member type is the return
         // type.
         return type.returnType;
@@ -349,18 +354,22 @@
   bool get isProperty => memberKind != ClassMemberKind.Method;
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get declarations => throw new UnimplementedError();
 
   @override
+  // Coverage-ignore(suite): Not run.
   void inferType(ClassMembersBuilder membersBuilder) {}
 
   @override
   bool get isDuplicate => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isField => throw new UnimplementedError();
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isGetter => throw new UnimplementedError();
 
   @override
@@ -376,9 +385,11 @@
   bool get isStatic => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isSynthesized => true;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void registerOverrideDependency(Set<ClassMember> overriddenMembers) {}
 
   @override
@@ -389,9 +400,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isExtensionTypeMember => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? getTearOff(ClassMembersBuilder membersBuilder) {
     // Ensure member is computed.
     getMember(membersBuilder);
@@ -623,6 +636,7 @@
         assert(
             _covariance ==
                 new Covariance.fromMember(_member!, forSetter: forSetter),
+            // Coverage-ignore(suite): Not run.
             "Unexpected covariance for combined members signature "
             "$_member. Found $_covariance, expected "
             "${new Covariance.fromMember(_member!, forSetter: forSetter)}.");
@@ -651,6 +665,7 @@
   ClassMember get interfaceMember => this;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isObjectMember(ClassBuilder objectClass) {
     return false;
   }
@@ -679,6 +694,7 @@
       declarations.map((ClassMember m) => m.fullName).join("%");
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullName {
     String suffix = isSetter ? "=" : "";
     return "${fullNameForErrors}$suffix";
@@ -803,11 +819,13 @@
   ClassMember get interfaceMember => implementedInterfaceMember;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isObjectMember(ClassBuilder objectClass) {
     return inheritedClassMember.isObjectMember(objectClass);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isSameDeclaration(ClassMember other) {
     // TODO(johnniwinther): Optimize this.
     return false;
@@ -846,6 +864,7 @@
     assert(
         !(implementedInterfaceMember.isNoSuchMethodForwarder &&
             !inheritedClassMember.isNoSuchMethodForwarder),
+        // Coverage-ignore(suite): Not run.
         "The inherited $inheritedClassMember has "
         "isNoSuchMethodForwarder="
         "${inheritedClassMember.isNoSuchMethodForwarder} but "
@@ -871,6 +890,7 @@
   String get fullNameForErrors => inheritedClassMember.fullNameForErrors;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullName => inheritedClassMember.fullName;
 
   @override
@@ -908,6 +928,7 @@
   DeclarationBuilder get declarationBuilder => extensionTypeDeclarationBuilder;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasDeclarations => true;
 
   void _ensureMemberAndCovariance(ClassMembersBuilder membersBuilder) {
@@ -983,6 +1004,7 @@
         assert(
             _covariance ==
                 new Covariance.fromMember(_member!, forSetter: forSetter),
+            // Coverage-ignore(suite): Not run.
             "Unexpected covariance for combined members signature "
             "$_member. Found $_covariance, expected "
             "${new Covariance.fromMember(_member!, forSetter: forSetter)}.");
@@ -1008,36 +1030,45 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ClassMember get interfaceMember => this;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isObjectMember(ClassBuilder objectClass) {
     return false;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isSameDeclaration(ClassMember other) {
     // TODO(johnniwinther): Optimize this.
     return false;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isNoSuchMethodForwarder => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get charOffset => declarations.first.charOffset;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Uri get fileUri => declarations.first.fileUri;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isAbstract => true;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullNameForErrors =>
       declarations.map((ClassMember m) => m.fullName).join("%");
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullName {
     String suffix = isSetter ? "=" : "";
     return "${fullNameForErrors}$suffix";
diff --git a/pkg/front_end/lib/src/kernel/hierarchy/extension_type_members.dart b/pkg/front_end/lib/src/kernel/hierarchy/extension_type_members.dart
index 38aa5aa..9dc256c 100644
--- a/pkg/front_end/lib/src/kernel/hierarchy/extension_type_members.dart
+++ b/pkg/front_end/lib/src/kernel/hierarchy/extension_type_members.dart
@@ -45,6 +45,7 @@
             memberMap[name] =
                 new _Tuple.declareExtensionTypeGetable(classMember);
           } else {
+            // Coverage-ignore-block(suite): Not run.
             tuple.declaredExtensionTypeGetable = classMember;
           }
         } else {
@@ -52,6 +53,7 @@
             memberMap[name] =
                 new _Tuple.declareNonExtensionTypeGetable(classMember);
           } else {
+            // Coverage-ignore-block(suite): Not run.
             tuple.declaredNonExtensionTypeGetable = classMember;
           }
         }
@@ -67,6 +69,7 @@
             tuple.declaredExtensionTypeSetable = classMember;
           }
         } else {
+          // Coverage-ignore-block(suite): Not run.
           if (tuple == null) {
             memberMap[name] =
                 new _Tuple.declareNonExtensionTypeSetable(classMember);
@@ -314,6 +317,7 @@
         this._declaredExtensionTypeSetable = declaredSetable,
         this.name = declaredSetable.name;
 
+  // Coverage-ignore(suite): Not run.
   _Tuple.declareNonExtensionTypeSetable(ClassMember declaredSetable)
       : assert(declaredSetable.forSetter),
         this._declaredNonExtensionTypeSetable = declaredSetable,
@@ -334,6 +338,7 @@
   ClassMember? get declaredExtensionTypeGetable =>
       _declaredExtensionTypeGetable;
 
+  // Coverage-ignore(suite): Not run.
   void set declaredExtensionTypeGetable(ClassMember? value) {
     assert(!value!.forSetter);
     assert(
@@ -355,10 +360,12 @@
     assert(value!.forSetter);
     assert(
         _declaredExtensionTypeSetable == null,
+        // Coverage-ignore(suite): Not run.
         "Declared extension type setable already set to "
         "$_declaredExtensionTypeSetable, trying to set it to $value.");
     assert(
         _declaredNonExtensionTypeSetable == null,
+        // Coverage-ignore(suite): Not run.
         "Declared non-extension type setable already set to "
         "$_declaredNonExtensionTypeSetable, trying to set the declared "
         "extension type setable to $value.");
@@ -368,6 +375,7 @@
   ClassMember? get declaredNonExtensionTypeGetable =>
       _declaredNonExtensionTypeGetable;
 
+  // Coverage-ignore(suite): Not run.
   void set declaredNonExtensionTypeGetable(ClassMember? value) {
     assert(!value!.forSetter);
     assert(
@@ -385,6 +393,7 @@
   ClassMember? get declaredNonExtensionTypeSetable =>
       _declaredNonExtensionTypeSetable;
 
+  // Coverage-ignore(suite): Not run.
   void set declaredNonExtensionTypeSetable(ClassMember? value) {
     assert(value!.forSetter);
     assert(
@@ -596,6 +605,7 @@
             ///       implements Interface {}
             definingGetable = implementedGetable;
           } else if (definingGetable.isStatic) {
+            // Coverage-ignore-block(suite): Not run.
             ///   class Interface {
             ///     method() {}
             ///   }
@@ -613,7 +623,9 @@
           // On the first skipped member we add all previous.
           implementedNonExtensionTypeGetables ??=
               tupleImplementedNonExtensionTypeGetables.take(i).toList();
-        } else if (implementedNonExtensionTypeGetables != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (implementedNonExtensionTypeGetables != null) {
           // If already skipping members we add [implementedGetable]
           // explicitly.
           implementedNonExtensionTypeGetables.add(implementedGetable);
@@ -666,6 +678,7 @@
             /// class Class implements Interface {}
             definingSetable = implementedSetable;
           } else if (definingSetable.isStatic) {
+            // Coverage-ignore-block(suite): Not run.
             ///   class Interface {
             ///     set setter(value) {}
             ///   }
@@ -679,6 +692,7 @@
             implementedSetable = null;
           }
         }
+        // Coverage-ignore(suite): Not run.
         if (implementedSetable == null) {
           // On the first skipped setter we add all previous.
           implementedNonExtensionTypeSetables ??=
@@ -693,7 +707,9 @@
         // No setters were skipped so we use the full list.
         implementedNonExtensionTypeSetables =
             tupleImplementedNonExtensionTypeSetables;
-      } else if (implementedNonExtensionTypeSetables.isEmpty) {
+      }
+      // Coverage-ignore(suite): Not run.
+      else if (implementedNonExtensionTypeSetables.isEmpty) {
         // No setters were included.
         implementedNonExtensionTypeSetables = null;
       }
@@ -751,7 +767,9 @@
           // On the first skipped member we add all previous.
           implementedExtensionTypeGetables ??=
               tupleImplementedExtensionTypeGetables.take(i).toList();
-        } else if (implementedExtensionTypeGetables != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (implementedExtensionTypeGetables != null) {
           // If already skipping members we add [implementedGetable]
           // explicitly.
           implementedExtensionTypeGetables.add(implementedGetable);
@@ -802,6 +820,7 @@
             /// class Class implements Interface {}
             definingSetable = implementedSetable;
           } else if (definingSetable.isStatic) {
+            // Coverage-ignore-block(suite): Not run.
             ///   class Interface {
             ///     set setter(value) {}
             ///   }
@@ -818,7 +837,9 @@
           // On the first skipped setter we add all previous.
           implementedExtensionTypeSetables ??=
               tupleImplementedExtensionTypeSetables.take(i).toList();
-        } else if (implementedExtensionTypeSetables != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (implementedExtensionTypeSetables != null) {
           // If already skipping setters we add [implementedSetable]
           // explicitly.
           implementedExtensionTypeSetables.add(implementedSetable);
diff --git a/pkg/front_end/lib/src/kernel/hierarchy/hierarchy_builder.dart b/pkg/front_end/lib/src/kernel/hierarchy/hierarchy_builder.dart
index cd6746c..3031557 100644
--- a/pkg/front_end/lib/src/kernel/hierarchy/hierarchy_builder.dart
+++ b/pkg/front_end/lib/src/kernel/hierarchy/hierarchy_builder.dart
@@ -79,6 +79,7 @@
 
   Supertype? asSupertypeOf(InterfaceType subtype, Class supertype) {
     if (subtype.classNode == supertype) {
+      // Coverage-ignore-block(suite): Not run.
       return new Supertype(supertype, subtype.typeArguments);
     }
     Supertype? cls = getClassAsInstanceOf(subtype.classNode, supertype);
@@ -128,10 +129,12 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isSubInterfaceOf(Class subtype, Class superclass) {
     return getClassAsInstanceOf(subtype, superclass) != null;
   }
 
+  // Coverage-ignore(suite): Not run.
   InterfaceType _getLegacyLeastUpperBoundInternal(
       TypeDeclarationType type1,
       TypeDeclarationType type2,
@@ -192,6 +195,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   InterfaceType getLegacyLeastUpperBound(
       InterfaceType type1, InterfaceType type2) {
     if (type1 == type2) return type1;
@@ -201,6 +205,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   InterfaceType getLegacyLeastUpperBoundFromSupertypeLists(
       TypeDeclarationType type1,
       TypeDeclarationType type2,
diff --git a/pkg/front_end/lib/src/kernel/hierarchy/hierarchy_node.dart b/pkg/front_end/lib/src/kernel/hierarchy/hierarchy_node.dart
index bf4fb2c..4187ccd 100644
--- a/pkg/front_end/lib/src/kernel/hierarchy/hierarchy_node.dart
+++ b/pkg/front_end/lib/src/kernel/hierarchy/hierarchy_node.dart
@@ -90,6 +90,7 @@
         if (interfaces.length == 1) {
           return null;
         } else {
+          // Coverage-ignore-block(suite): Not run.
           interfaces = interfaces.toList();
           interfaces.removeAt(i);
           return _ignoreFunction(interfaces);
@@ -319,6 +320,7 @@
   /// If `true`, [mixedInNode] is non-null.
   bool get isMixinApplication => mixedInNode != null;
 
+  // Coverage-ignore(suite): Not run.
   /// Returns a list of all supertypes of [classBuilder], including this node.
   List<ClassHierarchyNode> computeAllSuperNodes(
       ClassHierarchyBuilder hierarchy) {
@@ -369,6 +371,7 @@
     return "$sb";
   }
 
+  // Coverage-ignore(suite): Not run.
   static int compareMaxInheritancePath(
       ClassHierarchyNode a, ClassHierarchyNode b) {
     return b.maxInheritancePath.compareTo(a.maxInheritancePath);
diff --git a/pkg/front_end/lib/src/kernel/hierarchy/members_builder.dart b/pkg/front_end/lib/src/kernel/hierarchy/members_builder.dart
index 0fc144c..2879650 100644
--- a/pkg/front_end/lib/src/kernel/hierarchy/members_builder.dart
+++ b/pkg/front_end/lib/src/kernel/hierarchy/members_builder.dart
@@ -181,7 +181,9 @@
     ClassMembersBuilder membersBuilder =
         new ClassMembersBuilder(hierarchyBuilder);
     for (ClassBuilder classBuilder in classes) {
-      assert(!classBuilder.isAugmenting,
+      assert(
+          !classBuilder.isAugmenting,
+          // Coverage-ignore(suite): Not run.
           "Unexpected augmentation class $classBuilder");
       membersBuilder.classNodes[classBuilder.cls] = new ClassMembersNodeBuilder(
               membersBuilder,
@@ -192,6 +194,7 @@
         in extensionTypeDeclarations) {
       assert(
           !extensionTypeDeclarationBuilder.isAugmenting,
+          // Coverage-ignore(suite): Not run.
           "Unexpected augment extension type declaration "
           "$extensionTypeDeclarationBuilder");
       membersBuilder.extensionTypeDeclarationNodes[
diff --git a/pkg/front_end/lib/src/kernel/hierarchy/members_node.dart b/pkg/front_end/lib/src/kernel/hierarchy/members_node.dart
index 8071e4e..459d86b 100644
--- a/pkg/front_end/lib/src/kernel/hierarchy/members_node.dart
+++ b/pkg/front_end/lib/src/kernel/hierarchy/members_node.dart
@@ -146,6 +146,7 @@
       ClassMember existing;
       ClassMember duplicate;
       assert(a.fileUri == b.fileUri ||
+          // Coverage-ignore(suite): Not run.
           a.name.text == "toString" &&
               (a.fileUri.isScheme("org-dartlang-sdk") &&
                       a.fileUri.pathSegments.isNotEmpty &&
@@ -155,6 +156,7 @@
                       b.fileUri.pathSegments.last == "enum.dart"));
 
       if (a.fileUri != b.fileUri) {
+        // Coverage-ignore-block(suite): Not run.
         if (a.fileUri.isScheme("org-dartlang-sdk")) {
           existing = a;
           duplicate = b;
@@ -281,6 +283,7 @@
           DartType? inferredParameterType;
           if (combinedMemberSignatureType == null) {
             inferredParameterType = const InvalidType();
+            // Coverage-ignore(suite): Not run.
             cantInferParameterTypes ??= [];
             cantInferParameterTypes.add(declaredParameter);
           } else {
@@ -670,6 +673,7 @@
         if (tuple == null) {
           memberMap[name] = new _Tuple.declareMember(classMember);
         } else {
+          // Coverage-ignore-block(suite): Not run.
           tuple.declaredMember = classMember;
         }
         if (name == noSuchMethodName &&
@@ -873,6 +877,7 @@
 
     ClassHierarchyNodeDataForTesting? dataForTesting;
     if (retainDataForTesting) {
+      // Coverage-ignore-block(suite): Not run.
       dataForTesting = new ClassHierarchyNodeDataForTesting(
           abstractMembers,
           declaredOverridesMap,
@@ -967,6 +972,7 @@
       computeClassInterfaceMember(noSuchMethodName, noSuchMethod);
     }
     noSuchMethodMember = interfaceMemberMap[noSuchMethodName] ??
+        // Coverage-ignore(suite): Not run.
         classMemberMap[noSuchMethodName];
 
     memberMap.forEach(computeClassInterfaceMember);
@@ -1028,20 +1034,24 @@
       /// the interface members separately.
       assert(
           classMemberMap.length == interfaceMemberMap.length,
+          // Coverage-ignore(suite): Not run.
           "Class/interface member mismatch. Class members: "
           "$classMemberMap, interface members: $interfaceMemberMap.");
       assert(
           classSetterMap.length == interfaceSetterMap.length,
+          // Coverage-ignore(suite): Not run.
           "Class/interface setter mismatch. Class setters: "
           "$classSetterMap, interface setters: $interfaceSetterMap.");
       assert(
           classMemberMap.keys.every((Name name) =>
               identical(classMemberMap[name], interfaceMemberMap?[name])),
+          // Coverage-ignore(suite): Not run.
           "Class/interface member mismatch. Class members: "
           "$classMemberMap, interface members: $interfaceMemberMap.");
       assert(
           classSetterMap.keys.every((Name name) =>
               identical(classSetterMap[name], interfaceSetterMap?[name])),
+          // Coverage-ignore(suite): Not run.
           "Class/interface setter mismatch. Class setters: "
           "$classSetterMap, interface setters: $interfaceSetterMap.");
       interfaceMemberMap = null;
@@ -1155,6 +1165,7 @@
     return "$sb";
   }
 
+  // Coverage-ignore(suite): Not run.
   void printMembers(
       List<ClassMember> members, StringBuffer sb, String heading) {
     sb.write("  ");
@@ -1170,6 +1181,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   void printMemberMap(
       Map<Name, ClassMember> memberMap, StringBuffer sb, String heading) {
     List<ClassMember> members = memberMap.values.toList();
@@ -1194,8 +1206,11 @@
   }
 
   ClassMember? getDispatchTarget(Name name, bool isSetter) {
-    ClassMember? result =
-        isSetter ? classSetterMap[name] : classMemberMap[name];
+    ClassMember? result = isSetter
+        ?
+        // Coverage-ignore(suite): Not run.
+        classSetterMap[name]
+        : classMemberMap[name];
     if (result == null) {
       return null;
     }
@@ -1208,6 +1223,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class ClassHierarchyNodeDataForTesting {
   final List<ClassMember> abstractMembers;
   final Map<ClassMember, Set<ClassMember>> declaredOverrides;
@@ -1272,6 +1288,7 @@
 
   ClassMember? get declaredMember => _declaredGetable;
 
+  // Coverage-ignore(suite): Not run.
   void set declaredMember(ClassMember? value) {
     assert(!value!.forSetter);
     assert(
@@ -1287,6 +1304,7 @@
     assert(value!.forSetter);
     assert(
         _declaredSetable == null,
+        // Coverage-ignore(suite): Not run.
         "Declared setter already set to $_declaredSetable, "
         "trying to set it to $value.");
     _declaredSetable = value;
@@ -1298,6 +1316,7 @@
     assert(!value!.forSetter);
     assert(
         _extendedGetable == null,
+        // Coverage-ignore(suite): Not run.
         "Extended member already set to $_extendedGetable, "
         "trying to set it to $value.");
     _extendedGetable = value;
@@ -1309,6 +1328,7 @@
     assert(value!.forSetter);
     assert(
         _extendedSetable == null,
+        // Coverage-ignore(suite): Not run.
         "Extended setter already set to $_extendedSetable, "
         "trying to set it to $value.");
     _extendedSetable = value;
@@ -1320,6 +1340,7 @@
     assert(!value!.forSetter);
     assert(
         _mixedInGetable == null,
+        // Coverage-ignore(suite): Not run.
         "Mixed in member already set to $_mixedInGetable, "
         "trying to set it to $value.");
     _mixedInGetable = value;
@@ -1331,6 +1352,7 @@
     assert(value!.forSetter);
     assert(
         _mixedInSetable == null,
+        // Coverage-ignore(suite): Not run.
         "Mixed in setter already set to $_mixedInSetable, "
         "trying to set it to $value.");
     _mixedInSetable = value;
@@ -1502,6 +1524,7 @@
         // The case is handled for consistency.
         if (definingGetable.isStatic ||
             definingGetable.isProperty != tupleMixedInMember.isProperty) {
+          // Coverage-ignore-block(suite): Not run.
           builder.reportInheritanceConflict(
               definingGetable, tupleMixedInMember);
         } else {
@@ -1515,6 +1538,7 @@
         !tupleMixedInSetter.isStatic &&
         !tupleMixedInSetter.isDuplicate &&
         !tupleMixedInSetter.isSynthesized) {
+      // Coverage-ignore-block(suite): Not run.
       /// We treat
       ///
       ///   class Mixin {
@@ -1712,7 +1736,9 @@
         if (implementedGetable == null) {
           // On the first skipped member we add all previous.
           implementedGetables ??= tupleImplementedMembers.take(i).toList();
-        } else if (implementedGetables != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (implementedGetables != null) {
           // If already skipping members we add [implementedGetable]
           // explicitly.
           implementedGetables.add(implementedGetable);
@@ -1773,7 +1799,9 @@
         if (implementedSetable == null) {
           // On the first skipped setter we add all previous.
           implementedSetables ??= tupleImplementedSetters.take(i).toList();
-        } else if (implementedSetables != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (implementedSetables != null) {
           // If already skipping setters we add [implementedSetable]
           // explicitly.
           implementedSetables.add(implementedSetable);
@@ -2275,7 +2303,9 @@
       ///      method() {}
       ///    }
       ///    class Class extends Super {}
-      assert(!_extendedMember.isAbstract,
+      assert(
+          !_extendedMember.isAbstract,
+          // Coverage-ignore(suite): Not run.
           "Abstract extended member: ${_extendedMember}");
 
       classMember = _extendedMember;
@@ -2616,6 +2646,7 @@
       assert(
           declaredMember.isSourceDeclaration &&
               declaredMember.declarationBuilder.origin == _classBuilder,
+          // Coverage-ignore(suite): Not run.
           "Only declared members can override: ${declaredMember}");
       hasDeclaredMembers = true;
       if (declaredMember.isProperty) {
@@ -2624,11 +2655,13 @@
       } else {
         assert(
             declaredMethod == null,
+            // Coverage-ignore(suite): Not run.
             "Multiple methods unexpectedly declared: "
             "${declaredMethod} and ${declaredMember}.");
         declaredMethod = declaredMember;
       }
       if (_dataForTesting != null && aliasForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         _dataForTesting.aliasMap[aliasForTesting] = declaredMember;
       }
     }
@@ -2659,7 +2692,9 @@
   /// instead default to `dynamic`.
   void registerMixedInOverride(ClassMember mixedInMember,
       {ClassMember? aliasForTesting}) {
-    assert(mixedInMember.declarationBuilder != _classBuilder,
+    assert(
+        mixedInMember.declarationBuilder != _classBuilder,
+        // Coverage-ignore(suite): Not run.
         "Only mixin members can override by application: ${mixedInMember}");
     if (_classBuilder is SourceClassBuilder) {
       hasDeclaredMembers = true;
@@ -2669,11 +2704,13 @@
       } else {
         assert(
             mixedInMethod == null,
+            // Coverage-ignore(suite): Not run.
             "Multiple methods unexpectedly declared in mixin: "
             "${mixedInMethod} and ${mixedInMember}.");
         mixedInMethod = mixedInMember;
       }
       if (_dataForTesting != null && aliasForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         _dataForTesting.aliasMap[aliasForTesting] = mixedInMember;
       }
     }
@@ -2701,10 +2738,12 @@
     if (_classBuilder is SourceClassBuilder) {
       assert(
           inheritedMember.declarationBuilder != _classBuilder,
+          // Coverage-ignore(suite): Not run.
           "Only inherited members can implement by inheritance: "
           "${inheritedMember}");
       _inheritedImplementsMap[inheritedMember] = overrides;
       if (_dataForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         _dataForTesting.aliasMap[aliasForTesting] = inheritedMember;
       }
     }
@@ -2811,6 +2850,7 @@
   for (ClassMember member in members) {
     if (member.hasDeclarations &&
         declarationBuilder == member.declarationBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       _toSet(declarationBuilder, member.declarations, result);
     } else {
       result.add(member);
diff --git a/pkg/front_end/lib/src/kernel/hierarchy/mixin_inferrer.dart b/pkg/front_end/lib/src/kernel/hierarchy/mixin_inferrer.dart
index dec99cd..da797b5 100644
--- a/pkg/front_end/lib/src/kernel/hierarchy/mixin_inferrer.dart
+++ b/pkg/front_end/lib/src/kernel/hierarchy/mixin_inferrer.dart
@@ -85,7 +85,9 @@
       if (mixinSuperclass.implementedTypes.length == 2) {
         s0 = mixinSuperclass.implementedTypes[0];
         s1 = mixinSuperclass.implementedTypes[1];
-      } else if (mixinSuperclass.implementedTypes.length == 1) {
+      }
+      // Coverage-ignore(suite): Not run.
+      else if (mixinSuperclass.implementedTypes.length == 1) {
         s0 = mixinSuperclass.supertype!;
         s1 = mixinSuperclass.implementedTypes.first;
       } else {
@@ -102,6 +104,7 @@
       Supertype? supertype =
           asInstantiationOf(baseType, mixinSupertype.classNode);
       if (supertype == null) {
+        // Coverage-ignore-block(suite): Not run.
         reportProblem(
             templateMixinInferenceNoMatchingClass.withArguments(mixinClass.name,
                 baseType.classNode.name, mixinSupertype.asInterfaceType),
@@ -133,6 +136,7 @@
     // Generate constraints based on the mixin's supertype.
     generateConstraints(mixinClass, baseType, mixinSupertype);
     if (_mixinInferenceSolution.isUnsolvable) {
+      // Coverage-ignore-block(suite): Not run.
       reportProblem(
           templateMixinInferenceNoMatchingClass.withArguments(mixinClass.name,
               baseType.classNode.name, mixinSupertype.asInterfaceType),
@@ -141,6 +145,7 @@
     // Generate new type parameters with the solution as bounds.
     List<TypeParameter> parameters;
     if (_mixinInferenceSolution.isUnsolvable) {
+      // Coverage-ignore-block(suite): Not run.
       parameters = [...mixinClass.typeParameters];
     } else {
       parameters = [
@@ -177,11 +182,13 @@
     return new Supertype(superclass, arguments);
   }
 
+  // Coverage-ignore(suite): Not run.
   void reportProblem(Message message, Class kernelClass) {
     int length = cls.isMixinApplication ? 1 : cls.fullNameForErrors.length;
     cls.addProblem(message, cls.charOffset, length);
   }
 
+  // Coverage-ignore(suite): Not run.
   Never reportUnsupportedProblem(String operation) {
     return unsupported(operation, cls.charOffset, cls.fileUri);
   }
@@ -226,21 +233,26 @@
       return <TypeParameter, DartType>{type1.parameter: type2};
     }
     if (type2 is TypeParameterType &&
+        // Coverage-ignore(suite): Not run.
         typeParametersToSolveFor.contains(type2.parameter)) {
+      // Coverage-ignore-block(suite): Not run.
       return <TypeParameter, DartType>{type2.parameter: type1};
     }
     switch (type1) {
       case AuxiliaryType():
+        // Coverage-ignore(suite): Not run.
         return unsupportedErrorReporter.reportUnsupportedProblem(
             "_MixinInferenceSolution._solveForEquality"
             "(${type1.runtimeType}, ${type2.runtimeType})");
       case InvalidType():
+        // Coverage-ignore(suite): Not run.
         if (type2 is! InvalidType) {
           return null;
         } else {
           return <TypeParameter, DartType>{};
         }
       case DynamicType():
+        // Coverage-ignore(suite): Not run.
         if (type2 is! DynamicType) {
           return null;
         } else {
@@ -253,12 +265,14 @@
           return <TypeParameter, DartType>{};
         }
       case NeverType():
+        // Coverage-ignore(suite): Not run.
         if (type2 is! NeverType) {
           return null;
         } else {
           return <TypeParameter, DartType>{};
         }
       case NullType():
+        // Coverage-ignore(suite): Not run.
         if (type2 is! NullType) {
           return null;
         } else {
@@ -310,9 +324,11 @@
           }
           Map<String, NamedType> namedParameterByName1 = <String, NamedType>{
             for (NamedType namedType in type1.namedParameters)
-              namedType.name: namedType
+              namedType // Coverage-ignore(suite): Not run.
+                  .name: namedType
           };
           for (NamedType namedType in type2.namedParameters) {
+            // Coverage-ignore-block(suite): Not run.
             if (!namedParameterByName1.containsKey(namedType.name)) {
               return null;
             } else {
@@ -333,10 +349,12 @@
           return result;
         }
       case TypedefType():
+        // Coverage-ignore(suite): Not run.
         return unsupportedErrorReporter.reportUnsupportedProblem(
             "_MixinInferenceSolution._solveForEquality"
             "(${type1.runtimeType}, ${type2.runtimeType})");
       case FutureOrType():
+        // Coverage-ignore(suite): Not run.
         if (type2 is! FutureOrType) {
           return null;
         } else {
@@ -344,11 +362,13 @@
               unsupportedErrorReporter: unsupportedErrorReporter);
         }
       case IntersectionType():
+        // Coverage-ignore(suite): Not run.
         // Intersection types can't appear in supertypes.
         return unsupportedErrorReporter.reportUnsupportedProblem(
             "_MixinInferenceSolution._solveForEquality"
             "(${type1.runtimeType}, ${type2.runtimeType})");
       case TypeParameterType():
+        // Coverage-ignore(suite): Not run.
         if (type2 is! TypeParameterType ||
             type1.parameter != type2.parameter ||
             type1.nullability != type2.nullability) {
@@ -366,6 +386,7 @@
           return <TypeParameter, DartType>{};
         }
       case RecordType():
+        // Coverage-ignore(suite): Not run.
         if (type2 is! RecordType) {
           return null;
         } else {
@@ -429,6 +450,7 @@
           }
           return result;
         }
+      // Coverage-ignore(suite): Not run.
       case ExtensionType():
         if (type2 is! ExtensionType) {
           return null;
@@ -463,6 +485,7 @@
     } else {
       for (TypeParameter typeParameter in result1.keys) {
         if (result2.containsKey(typeParameter)) {
+          // Coverage-ignore-block(suite): Not run.
           if (result1[typeParameter] != result2[typeParameter]) {
             return null;
           }
diff --git a/pkg/front_end/lib/src/kernel/implicit_field_type.dart b/pkg/front_end/lib/src/kernel/implicit_field_type.dart
index 9c9ffc5..a593ea6 100644
--- a/pkg/front_end/lib/src/kernel/implicit_field_type.dart
+++ b/pkg/front_end/lib/src/kernel/implicit_field_type.dart
@@ -35,45 +35,54 @@
       _InferredTypeUse;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Nullability get declaredNullability =>
       unsupported("declaredNullability", charOffset ?? -1, fileUri);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Nullability get nullability {
     unsupported("nullability", charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get nonTypeVariableBound {
     throw unsupported("nonTypeVariableBound", charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasNonObjectMemberAccess {
     throw unsupported("hasNonObjectMemberAccess", charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept<R>(DartTypeVisitor<R> v) {
     throw unsupported("accept", charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept1<R, A>(DartTypeVisitor1<R, A> v, arg) {
     throw unsupported("accept1", charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Never visitChildren(Visitor<dynamic> v) {
     unsupported("visitChildren", charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   InferredType withDeclaredNullability(Nullability nullability) {
     return unsupported("withNullability", charOffset ?? -1, fileUri);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   InferredType toNonNull() {
     return unsupported("toNonNullable", charOffset ?? -1, fileUri);
   }
@@ -92,9 +101,11 @@
   _ImplicitFieldTypeRoot(this.fieldBuilder, this.initializerToken) : super._();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Uri get fileUri => fieldBuilder.fileUri;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get charOffset => fieldBuilder.charOffset;
 
   @override
@@ -134,7 +145,10 @@
               fieldBuilder.fileUri,
               enclosingClassThisType,
               fieldBuilder.libraryBuilder,
-              fieldBuilder.dataForTesting?.inferenceData);
+              fieldBuilder
+                  .dataForTesting
+                  // Coverage-ignore(suite): Not run.
+                  ?.inferenceData);
       BodyBuilderContext bodyBuilderContext =
           fieldBuilder.createBodyBuilderContext(
               inOutlineBuildingPhase: false,
@@ -166,11 +180,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('<implicit-field-type:$fieldBuilder>');
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool equals(Object other, Assumptions? assumptions) {
     if (identical(this, other)) return true;
     return other is _ImplicitFieldTypeRoot &&
@@ -190,27 +206,33 @@
   _InferredTypeUse(this.inferableTypeUse) : super._();
 
   @override
+  // Coverage-ignore(suite): Not run.
   int? get charOffset => inferableTypeUse.typeBuilder.charOffset;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Uri? get fileUri => inferableTypeUse.typeBuilder.fileUri;
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType computeType(ClassHierarchyBase hierarchy) {
     return inferType(hierarchy);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType inferType(ClassHierarchyBase hierarchy) {
     return inferableTypeUse.inferType(hierarchy);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('<inferred-type:${inferableTypeUse.typeBuilder}>');
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool equals(Object other, Assumptions? assumptions) {
     if (identical(this, other)) return true;
     return other is _InferredTypeUse &&
diff --git a/pkg/front_end/lib/src/kernel/implicit_type_argument.dart b/pkg/front_end/lib/src/kernel/implicit_type_argument.dart
index 9cc0ec9..b59ad00 100644
--- a/pkg/front_end/lib/src/kernel/implicit_type_argument.dart
+++ b/pkg/front_end/lib/src/kernel/implicit_type_argument.dart
@@ -26,51 +26,62 @@
   const ImplicitTypeArgument();
 
   @override
+  // Coverage-ignore(suite): Not run.
   Nullability get declaredNullability =>
       unsupported("declaredNullability", -1, null);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Nullability get nullability => unsupported("nullability", -1, null);
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get nonTypeVariableBound {
     throw unsupported("nonTypeVariableBound", -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get hasNonObjectMemberAccess {
     throw unsupported("hasNonObjectMemberAccess", -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept<R>(DartTypeVisitor<R> v) {
     throw unhandled("$runtimeType", "${v.runtimeType}", -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   R accept1<R, A>(DartTypeVisitor1<R, A> v, A arg) {
     return unhandled("$runtimeType", "${v.runtimeType}", -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Never visitChildren(Visitor v) {
     unhandled("$runtimeType", "${v.runtimeType}", -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ImplicitTypeArgument withDeclaredNullability(Nullability nullability) {
     return unsupported("withDeclaredNullability", -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ImplicitTypeArgument toNonNull() {
     return unsupported("toNonNullable", -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool equals(Object other, Assumptions? assumptions) => this == other;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('<implicit-type-argument>');
   }
diff --git a/pkg/front_end/lib/src/kernel/internal_ast.dart b/pkg/front_end/lib/src/kernel/internal_ast.dart
index eca8795..41531c1 100644
--- a/pkg/front_end/lib/src/kernel/internal_ast.dart
+++ b/pkg/front_end/lib/src/kernel/internal_ast.dart
@@ -124,6 +124,7 @@
       return new ExtensionMethodTypeArgumentsInfo(arguments);
     }
   } else {
+    // Coverage-ignore-block(suite): Not run.
     // This code path should only be taken in situations where there are no
     // type arguments at all, e.g. calling a user-definable operator.
     assert(arguments.types.isEmpty);
@@ -143,6 +144,7 @@
           .toList();
     }
   } else {
+    // Coverage-ignore-block(suite): Not run.
     // This code path should only be taken in situations where there are no
     // type arguments at all, e.g. calling a user-definable operator.
     assert(arguments.types.isEmpty);
@@ -156,28 +158,33 @@
 
 mixin InternalTreeNode implements TreeNode {
   @override
+  // Coverage-ignore(suite): Not run.
   void replaceChild(TreeNode child, TreeNode replacement) {
     // Do nothing. The node should not be part of the resulting AST, anyway.
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformChildren(Transformer v) {
     unsupported(
         "${runtimeType}.transformChildren on ${v.runtimeType}", -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void transformOrRemoveChildren(RemovingTransformer v) {
     unsupported("${runtimeType}.transformOrRemoveChildren on ${v.runtimeType}",
         -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor v) {
     unsupported("${runtimeType}.visitChildren on ${v.runtimeType}", -1, null);
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Common base class for internal statements.
 abstract class InternalStatement extends AuxiliaryStatement {
   @override
@@ -231,6 +238,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter state) {
     // TODO(johnniwinther): Implement this.
   }
@@ -258,6 +266,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('try ');
     printer.writeStatement(tryBlock);
@@ -299,6 +308,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     if (isContinue) {
       printer.write('continue ');
@@ -310,6 +320,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Common base class for internal expressions.
 abstract class InternalExpression extends AuxiliaryExpression {
   @override
@@ -346,6 +357,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Common base class for internal initializers.
 abstract class InternalInitializer extends AuxiliaryInitializer {
   @override
@@ -526,6 +538,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('let ');
     printer.writeVariableDeclaration(variable);
@@ -569,6 +582,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('let ');
     printer.writeVariableDeclaration(variable);
@@ -608,6 +622,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     if (isConst) {
       printer.write('const ');
@@ -648,6 +663,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     if (isConst) {
       printer.write('const ');
@@ -688,6 +704,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     if (isConst) {
       printer.write('const ');
@@ -749,6 +766,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(left, minimumPrecedence: Precedence.CONDITIONAL);
     printer.write(' ?? ');
@@ -773,6 +791,7 @@
 
   double? asDouble({bool negated = false}) {
     if (value == 0 && negated) {
+      // Coverage-ignore-block(suite): Not run.
       return -0.0;
     }
     BigInt intValue = new BigInt.from(negated ? -value : value);
@@ -794,6 +813,7 @@
   @override
   void toTextInternal(AstPrinter printer) {
     if (literal == null) {
+      // Coverage-ignore-block(suite): Not run.
       printer.write('$value');
     } else {
       printer.write(literal!);
@@ -809,6 +829,7 @@
 
   ShadowLargeIntLiteral(this.literal, this.fileOffset) : super(0);
 
+  // Coverage-ignore(suite): Not run.
   double? asDouble({bool negated = false}) {
     BigInt? intValue = BigInt.tryParse(negated ? '-${literal}' : literal);
     if (intValue == null) {
@@ -838,6 +859,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write(literal);
   }
@@ -902,6 +924,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(expression);
     printer.writeArguments(arguments);
@@ -938,6 +961,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     Expression methodInvocation = invocation;
     if (methodInvocation is InstanceInvocation) {
@@ -999,6 +1023,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     Expression propertyGet = read;
     if (propertyGet is PropertyGet) {
@@ -1048,6 +1073,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     Expression propertySet = write;
     if (propertySet is InstanceSet) {
@@ -1094,6 +1120,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     if (isArrow) {
       printer.write('=>');
@@ -1219,6 +1246,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeVariableDeclaration(this,
         isLate: isLate || lateGetter != null, type: lateType ?? type);
@@ -1259,6 +1287,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write(import.name!);
     printer.write('.loadLibrary');
@@ -1289,6 +1318,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write(import.name!);
     printer.write('.loadLibrary');
@@ -1345,6 +1375,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver);
     printer.write('.');
@@ -1392,6 +1423,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(read);
     printer.write(' ?? ');
@@ -1547,6 +1579,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver);
     printer.write('.');
@@ -1690,6 +1723,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver);
     printer.write('[');
@@ -1741,6 +1775,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver);
     printer.write('[');
@@ -1849,6 +1884,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write(extension.name);
     if (explicitTypeArguments != null) {
@@ -2137,6 +2173,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver);
     printer.write('[');
@@ -2245,6 +2282,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver);
     printer.write('?.');
@@ -2332,6 +2370,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver);
     printer.write('?.');
@@ -2646,6 +2685,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(left, minimumPrecedence: Precedence.EQUALITY);
     if (isNot) {
@@ -2680,9 +2720,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get precedence => Precedence.binaryPrecedence[binaryName.text]!;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(left, minimumPrecedence: precedence);
     printer.write(' ${binaryName.text} ');
@@ -2706,6 +2748,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get precedence => Precedence.PREFIX;
 
   @override
@@ -2714,6 +2757,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     if (unaryName == unaryMinusName) {
       printer.write('-');
@@ -2739,6 +2783,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get precedence => Precedence.CALLEE;
 
   @override
@@ -2747,6 +2792,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('(');
     printer.writeExpression(expression);
@@ -2776,11 +2822,13 @@
   } else if (node is VariableGet) {
     assert(
         node.variable.isFinal && !node.variable.isLate,
+        // Coverage-ignore(suite): Not run.
         "Trying to clone VariableGet of non-final variable"
         " ${node.variable}.");
     return new VariableGet(node.variable, node.promotedType)
       ..fileOffset = node.fileOffset;
   }
+  // Coverage-ignore-block(suite): Not run.
   throw new UnsupportedError("Clone not supported for ${node.runtimeType}.");
 }
 
@@ -2813,9 +2861,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get precedence => Precedence.PRIMARY;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver, minimumPrecedence: Precedence.PRIMARY);
     printer.write('.');
@@ -2850,9 +2900,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get precedence => Precedence.PRIMARY;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver, minimumPrecedence: Precedence.PRIMARY);
     printer.write('.');
@@ -2895,6 +2947,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeExpression(receiver, minimumPrecedence: Precedence.PRIMARY);
     printer.write('.');
@@ -2931,9 +2984,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get precedence => Precedence.PRIMARY;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('augment super');
     printer.writeArguments(arguments);
@@ -2964,9 +3019,11 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get precedence => Precedence.PRIMARY;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('augment super');
   }
@@ -3002,6 +3059,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('augment super = ');
     printer.writeExpression(value);
@@ -3033,6 +3091,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     if (isConst) {
       printer.write('const ');
@@ -3086,6 +3145,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('if (');
     printer.writeExpression(expression);
@@ -3112,6 +3172,7 @@
     MapLiteralEntry? otherwiseEntry;
     Expression? otherwise = this.otherwise;
     if (otherwise != null) {
+      // Coverage-ignore-block(suite): Not run.
       if (otherwise is ControlFlowElement) {
         ControlFlowElement otherwiseElement = otherwise;
         otherwiseEntry = otherwiseElement.toMapLiteralEntry(onConvertElement);
@@ -3162,6 +3223,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('if (');
     expression.toTextInternal(printer);
@@ -3214,6 +3276,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     patternVariableDeclaration.toTextInternal(printer);
     printer.write('for (');
@@ -3273,6 +3336,7 @@
       required this.body});
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     patternVariableDeclaration.toTextInternal(printer);
     printer.write('for (');
@@ -3332,6 +3396,7 @@
 
   Procedure get target => targetReference.asProcedure;
 
+  // Coverage-ignore(suite): Not run.
   void set target(Procedure target) {
     // Getter vs setter doesn't matter for procedures.
     targetReference = getNonNullableMemberReferenceGetter(target);
@@ -3343,6 +3408,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('this');
     if (target.name.text.isNotEmpty) {
@@ -3383,6 +3449,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.writeMemberName(fieldReference);
     printer.write(" = ");
diff --git a/pkg/front_end/lib/src/kernel/invalid_type.dart b/pkg/front_end/lib/src/kernel/invalid_type.dart
index 02567ce..d65d719 100644
--- a/pkg/front_end/lib/src/kernel/invalid_type.dart
+++ b/pkg/front_end/lib/src/kernel/invalid_type.dart
@@ -21,6 +21,7 @@
   const _InvalidTypeFinder();
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitAuxiliaryType(
       AuxiliaryType node, Set<TypedefType> visitedTypedefs) {
     if (node is UnknownType) {
@@ -89,6 +90,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitTypedefType(TypedefType node, Set<TypedefType> visitedTypedefs) {
     // The unaliased type should be checked, but it's faster to check the type
     // arguments and the RHS separately than do the unaliasing because it avoids
@@ -119,6 +121,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitIntersectionType(
       IntersectionType node, Set<TypedefType> visitedTypedefs) {
     return node.right.accept1(this, visitedTypedefs);
diff --git a/pkg/front_end/lib/src/kernel/kernel_constants.dart b/pkg/front_end/lib/src/kernel/kernel_constants.dart
index f5f127a..3873057 100644
--- a/pkg/front_end/lib/src/kernel/kernel_constants.dart
+++ b/pkg/front_end/lib/src/kernel/kernel_constants.dart
@@ -19,8 +19,10 @@
     // Try to find library.
     Uri uri = message.uri!;
     CompilationUnit? compilationUnit = loader.lookupCompilationUnit(uri);
+    // Coverage-ignore(suite): Not run.
     compilationUnit ??= loader.lookupCompilationUnitByFileUri(uri);
     if (compilationUnit == null) {
+      // Coverage-ignore-block(suite): Not run.
       // TODO(jensj): Probably a part or something.
       loader.addProblem(message.messageObject, message.charOffset,
           message.length, message.uri,
diff --git a/pkg/front_end/lib/src/kernel/kernel_helper.dart b/pkg/front_end/lib/src/kernel/kernel_helper.dart
index 4fb1ec5..9ef59b6 100644
--- a/pkg/front_end/lib/src/kernel/kernel_helper.dart
+++ b/pkg/front_end/lib/src/kernel/kernel_helper.dart
@@ -309,6 +309,7 @@
     Expression annotation = annotations[i];
     if (annotation is FileUriExpression &&
         annotation.fileUri == annotatableFileUri) {
+      // Coverage-ignore-block(suite): Not run.
       annotations[i] = annotation.expression..parent = annotatable;
     }
   }
diff --git a/pkg/front_end/lib/src/kernel/kernel_target.dart b/pkg/front_end/lib/src/kernel/kernel_target.dart
index cfc616c..ff96c8b 100644
--- a/pkg/front_end/lib/src/kernel/kernel_target.dart
+++ b/pkg/front_end/lib/src/kernel/kernel_target.dart
@@ -198,6 +198,7 @@
           accessor: loader.coreLibraryCompilationUnit);
     }
     if (context.compilingPlatform) {
+      // Coverage-ignore-block(suite): Not run.
       for (String uri in backendTarget.extraRequiredLibrariesPlatform) {
         loader.read(Uri.parse(uri), 0,
             accessor: loader.coreLibraryCompilationUnit);
@@ -217,7 +218,9 @@
     return processedOptions.format(
         fileUri != null
             ? message.withLocation(fileUri, charOffset, length)
-            : message.withoutLocation(),
+            :
+            // Coverage-ignore(suite): Not run.
+            message.withoutLocation(),
         severity,
         messageContext,
         involvedFiles: involvedFiles);
@@ -262,6 +265,7 @@
     Source source = new Source(lineStarts, sourceCode, importUri, fileUri);
     uriToSource[fileUri] = source;
     if (_hasAddedSources) {
+      // Coverage-ignore-block(suite): Not run.
       // The sources have already been added to the component in [link] so we
       // have to add source directly here to create a consistent component.
       component?.uriToSource[fileUri] = excludeSource
@@ -271,6 +275,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   void removeSourceInformation(Uri fileUri) {
     uriToSource.remove(fileUri);
     if (_hasAddedSources) {
@@ -308,10 +313,12 @@
           String packageName = package.name;
           Uri packageUri = package.packageUriRoot;
           if (packageUri.hasFragment == true) {
+            // Coverage-ignore-block(suite): Not run.
             packageUri = packageUri.removeFragment();
           }
           String prefix = "${packageUri}";
           if (asString.startsWith(prefix)) {
+            // Coverage-ignore-block(suite): Not run.
             Uri reversed = Uri.parse(
                 "package:$packageName/${asString.substring(prefix.length)}");
             if (entryPoint == uriTranslator.translate(reversed)) {
@@ -332,27 +339,37 @@
     _hasComputedNeededPrecompilations = true;
     if (loader.roots.isEmpty) return null;
     return await withCrashReporting<NeededPrecompilations?>(() async {
-      benchmarker?.enterPhase(BenchmarkPhases.outline_kernelBuildOutlines);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_kernelBuildOutlines);
       await loader.buildOutlines();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_resolveParts);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_resolveParts);
       loader.resolveParts();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_becomeCoreLibrary);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_becomeCoreLibrary);
       loader.coreLibrary.becomeCoreLibrary();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_computeMacroDeclarations);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_computeMacroDeclarations);
       NeededPrecompilations? result =
           context.options.globalFeatures.macros.isEnabled
               ? loader.computeMacroDeclarations()
               : null;
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.unknownComputeNeededPrecompilations);
       return result;
     }, () => loader.currentUriForCrashReporting);
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Builds [augmentationLibraries] to the state expected after applying phase
   /// 1 macros.
   Future<void> _buildForPhase1(MacroApplications macroApplications,
@@ -374,6 +391,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Builds [augmentationLibraries] to the state expected after applying phase
   /// 2 macros.
   void _buildForPhase2(List<SourceLibraryBuilder> augmentationLibraries) {
@@ -385,6 +403,7 @@
     loader.resolveConstructors(augmentationLibraries);
   }
 
+  // Coverage-ignore(suite): Not run.
   Future<void> _applyMacroPhase2(
       MacroApplications macroApplications,
       List<SourceClassBuilder> sortedSourceClassBuilders,
@@ -415,6 +434,7 @@
     await applyDeclarationMacros();
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Builds [augmentationLibraries] to the state expected after applying phase
   /// 3 macros.
   void _buildForPhase3(List<SourceLibraryBuilder> augmentationLibraries) {
@@ -423,10 +443,12 @@
 
   Future<BuildResult> buildOutlines({CanonicalName? nameRoot}) async {
     if (loader.roots.isEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       return new BuildResult();
     }
     return await withCrashReporting<BuildResult>(() async {
       if (!_hasComputedNeededPrecompilations) {
+        // Coverage-ignore-block(suite): Not run.
         NeededPrecompilations? neededPrecompilations =
             await computeNeededPrecompilations();
         // To support macros, the needed macro libraries must be compiled be
@@ -441,27 +463,40 @@
         }
       }
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_computeLibraryScopes);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_computeLibraryScopes);
       loader.computeLibraryScopes(loader.loadedLibraryBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_computeMacroApplications);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_computeMacroApplications);
       MacroApplications? macroApplications =
           await loader.computeMacroApplications();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_setupTopAndBottomTypes);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_setupTopAndBottomTypes);
       setupTopAndBottomTypes();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_resolveTypes);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_resolveTypes);
       loader.resolveTypes(loader.sourceLibraryBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_computeVariances);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_computeVariances);
       loader.computeVariances(loader.sourceLibraryBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_computeDefaultTypes);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_computeDefaultTypes);
       loader.computeDefaultTypes(
           dynamicType, nullType, bottomType, objectClassBuilder);
 
       if (macroApplications != null) {
+        // Coverage-ignore-block(suite): Not run.
         benchmarker?.enterPhase(BenchmarkPhases.outline_applyTypeMacros);
         macroApplications.enterTypeMacroPhase();
         List<SourceLibraryBuilder> augmentationLibraries =
@@ -471,39 +506,56 @@
         await _buildForPhase1(macroApplications, augmentationLibraries);
       }
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_checkSemantics);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_checkSemantics);
       List<SourceClassBuilder>? sortedSourceClassBuilders;
       List<SourceExtensionTypeDeclarationBuilder>?
           sortedSourceExtensionTypeBuilders;
       (sortedSourceClassBuilders, sortedSourceExtensionTypeBuilders) =
           loader.checkClassCycles(objectClassBuilder);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_finishTypeVariables);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_finishTypeVariables);
       loader.finishTypeVariables(
           loader.sourceLibraryBuilders, objectClassBuilder, dynamicType);
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.outline_createTypeInferenceEngine);
       loader.createTypeInferenceEngine();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_buildComponent);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_buildComponent);
       loader.buildOutlineNodes();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_installDefaultSupertypes);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_installDefaultSupertypes);
       installDefaultSupertypes();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_link);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_link);
       component =
           link(new List<Library>.of(loader.libraries), nameRoot: nameRoot);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_computeCoreTypes);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_computeCoreTypes);
       computeCoreTypes();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_buildClassHierarchy);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_buildClassHierarchy);
       loader.buildClassHierarchy(sortedSourceClassBuilders,
           sortedSourceExtensionTypeBuilders, objectClassBuilder);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_checkSupertypes);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_checkSupertypes);
       loader.checkSupertypes(
           sortedSourceClassBuilders,
           sortedSourceExtensionTypeBuilders,
@@ -512,29 +564,40 @@
           underscoreEnumClass);
 
       if (macroApplications != null) {
+        // Coverage-ignore-block(suite): Not run.
         await _applyMacroPhase2(macroApplications, sortedSourceClassBuilders,
             sortedSourceExtensionTypeBuilders);
       }
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.outline_installSyntheticConstructors);
       installSyntheticConstructors(sortedSourceClassBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_resolveConstructors);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_resolveConstructors);
       loader.resolveConstructors(loader.sourceLibraryBuilders);
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.outline_buildClassHierarchyMembers);
       loader.buildClassHierarchyMembers(
           sortedSourceClassBuilders, sortedSourceExtensionTypeBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_computeHierarchy);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_computeHierarchy);
       loader.computeHierarchy();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_computeShowHideElements);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_computeShowHideElements);
       loader.computeShowHideElements();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_installTypedefTearOffs);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_installTypedefTearOffs);
       List<DelayedDefaultValueCloner>?
           typedefTearOffsDelayedDefaultValueCloners =
           loader.installTypedefTearOffs();
@@ -542,49 +605,69 @@
           ?.forEach(registerDelayedDefaultValueCloner);
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.outline_computeFieldPromotability);
       loader.computeFieldPromotability();
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_performTopLevelInference);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_performTopLevelInference);
       loader.performTopLevelInference(sortedSourceClassBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_checkOverrides);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_checkOverrides);
       loader.checkOverrides(sortedSourceClassBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_checkAbstractMembers);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_checkAbstractMembers);
       loader.checkAbstractMembers(sortedSourceClassBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_checkMixins);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_checkMixins);
       loader.checkMixins(sortedSourceClassBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_buildOutlineExpressions);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_buildOutlineExpressions);
       // TODO(johnniwinther): Add an interface for registering delayed actions.
       List<DelayedDefaultValueCloner> delayedDefaultValueCloners = [];
       loader.buildOutlineExpressions(
           loader.hierarchy, delayedDefaultValueCloners);
       delayedDefaultValueCloners.forEach(registerDelayedDefaultValueCloner);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_checkTypes);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_checkTypes);
       loader.checkTypes();
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.outline_checkRedirectingFactories);
       loader.checkRedirectingFactories(
           sortedSourceClassBuilders, sortedSourceExtensionTypeBuilders);
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.outline_finishSynthesizedParameters);
       finishSynthesizedParameters(forOutline: true);
 
-      benchmarker?.enterPhase(BenchmarkPhases.outline_checkMainMethods);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.outline_checkMainMethods);
       loader.checkMainMethods();
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.outline_installAllComponentProblems);
       installAllComponentProblems(loader.allComponentProblems);
       loader.allComponentProblems.clear();
 
-      benchmarker?.enterPhase(BenchmarkPhases.unknownBuildOutlines);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.unknownBuildOutlines);
 
       // For whatever reason sourceClassBuilders is kept alive for some amount
       // of time, meaning that all source library builders will be kept alive
@@ -610,12 +693,14 @@
       bool verify = false,
       bool allowVerificationErrorForTesting = false}) async {
     if (loader.roots.isEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       return new BuildResult(macroApplications: macroApplications);
     }
     return await withCrashReporting<BuildResult>(() async {
       ticker.logMs("Building component");
 
       if (macroApplications != null) {
+        // Coverage-ignore-block(suite): Not run.
         benchmarker?.enterPhase(BenchmarkPhases.body_applyDefinitionMacros);
         macroApplications.enterDefinitionMacroPhase();
         List<SourceLibraryBuilder> augmentationLibraries =
@@ -631,58 +716,85 @@
         _buildForPhase3(augmentationLibraries);
       }
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_buildBodies);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_buildBodies);
       await loader.buildBodies(loader.sourceLibraryBuilders);
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_checkMixinSuperAccesses);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_checkMixinSuperAccesses);
       loader.checkMixinSuperAccesses();
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_finishSynthesizedParameters);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_finishSynthesizedParameters);
       finishSynthesizedParameters();
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_finishDeferredLoadTearoffs);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_finishDeferredLoadTearoffs);
       loader.finishDeferredLoadTearoffs();
 
       benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.body_finishNoSuchMethodForwarders);
       loader.finishNoSuchMethodForwarders();
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_collectSourceClasses);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_collectSourceClasses);
       List<SourceClassBuilder>? sourceClasses = [];
       List<SourceExtensionTypeDeclarationBuilder>? extensionTypeDeclarations =
           [];
       loader.collectSourceClasses(sourceClasses, extensionTypeDeclarations);
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_finishNativeMethods);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_finishNativeMethods);
       loader.finishNativeMethods();
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_finishAugmentationMethods);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_finishAugmentationMethods);
       loader.buildBodyNodes();
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_finishAllConstructors);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_finishAllConstructors);
       finishAllConstructors(sourceClasses, extensionTypeDeclarations);
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_runBuildTransformations);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_runBuildTransformations);
       runBuildTransformations();
 
       if (loader.macroClass != null) {
+        // Coverage-ignore-block(suite): Not run.
         checkMacroApplications(loader.hierarchy, loader.macroClass!,
             loader.sourceLibraryBuilders, macroApplications);
       }
       if (macroApplications != null) {
+        // Coverage-ignore-block(suite): Not run.
         macroApplications.buildMergedAugmentationLibraries(component!);
       }
 
       if (verify) {
-        benchmarker?.enterPhase(BenchmarkPhases.body_verify);
+        benchmarker
+            // Coverage-ignore(suite): Not run.
+            ?.enterPhase(BenchmarkPhases.body_verify);
         _verify(
             allowVerificationErrorForTesting: allowVerificationErrorForTesting);
       }
 
-      benchmarker?.enterPhase(BenchmarkPhases.body_installAllComponentProblems);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.body_installAllComponentProblems);
       installAllComponentProblems(loader.allComponentProblems);
 
-      benchmarker?.enterPhase(BenchmarkPhases.unknownBuildComponent);
+      benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.unknownBuildComponent);
 
       // For whatever reason sourceClasses is kept alive for some amount
       // of time, meaning that all source library builders will be kept alive
@@ -691,7 +803,9 @@
       sourceClasses = null;
       extensionTypeDeclarations = null;
 
-      context.options.hooksForTesting?.onBuildComponentComplete(component!);
+      context.options.hooksForTesting
+          // Coverage-ignore(suite): Not run.
+          ?.onBuildComponentComplete(component!);
 
       return new BuildResult(
           component: component, macroApplications: macroApplications);
@@ -720,7 +834,9 @@
     Map<Uri, Source> uriToSource = new Map<Uri, Source>();
     void copySource(Uri uri, Source source) {
       uriToSource[uri] = excludeSource
-          ? new Source(source.lineStarts, const <int>[], source.importUri,
+          ?
+          // Coverage-ignore(suite): Not run.
+          new Source(source.lineStarts, const <int>[], source.importUri,
               source.fileUri)
           : source;
     }
@@ -756,6 +872,7 @@
       Builder? declaration =
           firstRoot.exportScope.lookup("main", -1, firstRoot.fileUri);
       if (declaration is AmbiguousBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         AmbiguousBuilder problem = declaration;
         declaration = problem.getFirstDeclaration();
       }
@@ -765,7 +882,9 @@
     }
     component.setMainMethodAndMode(mainReference, true, compiledMode);
 
-    assert(_getLibraryNnbdModeError(component) == null,
+    assert(
+        _getLibraryNnbdModeError(component) == null,
+        // Coverage-ignore(suite): Not run.
         "Got error: ${_getLibraryNnbdModeError(component)}");
 
     ticker.logMs("Linked component");
@@ -818,10 +937,13 @@
         if (component.mode == NonNullableByDefaultCompiledMode.Strong) {
           if (library.nonNullableByDefaultCompiledMode !=
               NonNullableByDefaultCompiledMode.Strong) {
+            // Coverage-ignore-block(suite): Not run.
             return "Expected library ${library.importUri} to be strong, "
                 "but was ${library.nonNullableByDefaultCompiledMode}";
           }
-        } else if (component.mode == NonNullableByDefaultCompiledMode.Weak) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (component.mode == NonNullableByDefaultCompiledMode.Weak) {
           if (library.nonNullableByDefaultCompiledMode !=
               NonNullableByDefaultCompiledMode.Weak) {
             return "Expected library ${library.importUri} to be weak, "
@@ -1004,6 +1126,7 @@
         }
 
         if (!isConstructorAdded) {
+          // Coverage-ignore-block(suite): Not run.
           builder.addSyntheticConstructor(_makeDefaultConstructor(
               builder, constructorReference, tearOffReference));
         }
@@ -1014,6 +1137,7 @@
       case ExtensionTypeDeclarationBuilder():
       case InvalidTypeDeclarationBuilder():
       case BuiltinTypeDeclarationBuilder():
+      // Coverage-ignore(suite): Not run.
       // TODO(johnniwinther): How should we handle this case?
       case OmittedTypeDeclarationBuilder():
       case null:
@@ -1276,6 +1400,7 @@
           }
         }
         if (!found && uri.path != "mirrors") {
+          // Coverage-ignore-block(suite): Not run.
           // dart:mirrors is optional.
           throw "Can't find $uri";
         }
@@ -1342,7 +1467,10 @@
           Initializer initializer;
           if (superTarget == null) {
             int offset = constructor.fileOffset;
-            if (offset == -1 && constructor.isSynthetic) {
+            if (offset == -1 &&
+                // Coverage-ignore(suite): Not run.
+                constructor.isSynthetic) {
+              // Coverage-ignore-block(suite): Not run.
               offset = cls.fileOffset;
             }
             classBuilder.addProblem(
@@ -1360,6 +1488,7 @@
           initializer.parent = constructor;
         }
         if (constructor.function.body == null) {
+          // Coverage-ignore-block(suite): Not run.
           /// >If a generative constructor c is not a redirecting constructor
           /// >and no body is provided, then c implicitly has an empty body {}.
           /// We use an empty statement instead.
@@ -1470,7 +1599,9 @@
             if (uri == 'dart:html' ||
                 uri == 'dart:svg' ||
                 uri == 'dart:_native_typed_data' ||
-                uri == 'dart:_interceptors' && file == 'js_string.dart') {
+                uri == 'dart:_interceptors' &&
+                    // Coverage-ignore(suite): Not run.
+                    file == 'js_string.dart') {
               // TODO(johnniwinther): Use external getters instead of final
               // fields. See https://github.com/dart-lang/sdk/issues/33762
             } else {
@@ -1548,7 +1679,9 @@
         loader.coreTypes,
         loader.libraries,
         new KernelDiagnosticReporter(loader),
-        logger: (String msg) => ticker.logMs(msg),
+        logger:
+            // Coverage-ignore(suite): Not run.
+            (String msg) => ticker.logMs(msg),
         changedStructureNotifier: changedStructureNotifier);
 
     TypeEnvironment environment =
@@ -1570,8 +1703,10 @@
             enableConstructorTearOff:
                 globalFeatures.constructorTearoffs.isEnabled,
             errorOnUnevaluatedConstant: errorOnUnevaluatedConstant,
-            exhaustivenessDataForTesting:
-                loader.dataForTesting?.exhaustivenessData);
+            exhaustivenessDataForTesting: loader
+                .dataForTesting
+                // Coverage-ignore(suite): Not run.
+                ?.exhaustivenessData);
     ticker.logMs("Evaluated constants");
 
     markLibrariesUsed(constantEvaluationData.visitedLibraries);
@@ -1600,6 +1735,7 @@
 
   ChangedStructureNotifier? get changedStructureNotifier => null;
 
+  // Coverage-ignore(suite): Not run.
   void runProcedureTransformations(Procedure procedure) {
     TypeEnvironment environment =
         new TypeEnvironment(loader.coreTypes, loader.hierarchy);
@@ -1635,7 +1771,9 @@
     // for legacy mode.
     assert(
         globalFeatures.nonNullable.isEnabled ||
+            // Coverage-ignore(suite): Not run.
             loader.nnbdMode == NnbdMode.Weak,
+        // Coverage-ignore(suite): Not run.
         "Non-weak nnbd mode found without experiment enabled: "
         "${loader.nnbdMode}.");
     return constants.EvaluationMode.fromNnbdMode(loader.nnbdMode);
@@ -1646,7 +1784,9 @@
     List<LocatedMessage> errors = verifyComponent(context.options.target,
         VerificationStage.afterModularTransformations, component!,
         skipPlatform: context.options.skipPlatformVerification);
-    assert(allowVerificationErrorForTesting || errors.isEmpty,
+    assert(
+        allowVerificationErrorForTesting || errors.isEmpty,
+        // Coverage-ignore(suite): Not run.
         "Verification errors found: $errors");
     ClassHierarchy hierarchy =
         new ClassHierarchy(component!, new CoreTypes(component!),
@@ -1659,6 +1799,7 @@
     ticker.logMs("Verified component");
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Return `true` if the given [library] was built by this [KernelTarget]
   /// from sources, and not loaded from a [DillTarget].
   /// Note that this is meant for debugging etc and that it is slow, each
diff --git a/pkg/front_end/lib/src/kernel/kernel_variable_builder.dart b/pkg/front_end/lib/src/kernel/kernel_variable_builder.dart
index 7424251..fb4b9cc 100644
--- a/pkg/front_end/lib/src/kernel/kernel_variable_builder.dart
+++ b/pkg/front_end/lib/src/kernel/kernel_variable_builder.dart
@@ -19,6 +19,7 @@
   VariableBuilderImpl(this.variable, this.fileUri);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Builder? get parent => null;
 
   @override
@@ -31,12 +32,14 @@
   bool get isConst => variable.isConst;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isFinal => variable.isFinal;
 
   @override
   bool get isAssignable => variable.isAssignable;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullNameForErrors => variable.name ?? "<unnamed>";
 
   @override
diff --git a/pkg/front_end/lib/src/kernel/load_library_builder.dart b/pkg/front_end/lib/src/kernel/load_library_builder.dart
index 3cce3da..7f7723e 100644
--- a/pkg/front_end/lib/src/kernel/load_library_builder.dart
+++ b/pkg/front_end/lib/src/kernel/load_library_builder.dart
@@ -55,6 +55,7 @@
       this._importCharOffset, this._combinators);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Uri get fileUri => parent.fileUri;
 
   LoadLibrary createLoadLibrary(
@@ -64,6 +65,7 @@
 
   Procedure createTearoffMethod(Forest forest) {
     if (tearoff != null) {
+      // Coverage-ignore-block(suite): Not run.
       return tearoff!;
     }
     LoadLibrary expression = createLoadLibrary(charOffset, forest, null);
@@ -84,5 +86,6 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullNameForErrors => 'loadLibrary';
 }
diff --git a/pkg/front_end/lib/src/kernel/macro/annotation_parser.dart b/pkg/front_end/lib/src/kernel/macro/annotation_parser.dart
index 0de7023..3802f295 100644
--- a/pkg/front_end/lib/src/kernel/macro/annotation_parser.dart
+++ b/pkg/front_end/lib/src/kernel/macro/annotation_parser.dart
@@ -21,6 +21,7 @@
 import '../../source/source_library_builder.dart';
 import 'macro.dart';
 
+// Coverage-ignore(suite): Not run.
 List<MacroApplication>? prebuildAnnotations(
     {required SourceLibraryBuilder enclosingLibrary,
     required List<MetadataBuilder>? metadataBuilders,
@@ -67,6 +68,7 @@
   const _UnrecognizedNode();
 }
 
+// Coverage-ignore(suite): Not run.
 class _MacroClassNode implements _Node {
   final Token token;
   final ClassBuilder classBuilder;
@@ -74,6 +76,7 @@
   _MacroClassNode(this.token, this.classBuilder);
 }
 
+// Coverage-ignore(suite): Not run.
 class _MacroConstructorNode implements _Node {
   final ClassBuilder classBuilder;
   final String constructorName;
@@ -81,12 +84,14 @@
   _MacroConstructorNode(this.classBuilder, this.constructorName);
 }
 
+// Coverage-ignore(suite): Not run.
 class _PrefixNode implements _Node {
   final PrefixBuilder prefixBuilder;
 
   _PrefixNode(this.prefixBuilder);
 }
 
+// Coverage-ignore(suite): Not run.
 class _MacroApplicationNode implements _Node {
   final MacroApplication application;
 
@@ -97,6 +102,7 @@
   const _NoArgumentsNode();
 }
 
+// Coverage-ignore(suite): Not run.
 class _ArgumentsNode implements _Node {
   final List<macro.Argument> positionalArguments;
   final Map<String, macro.Argument> namedArguments;
@@ -104,6 +110,7 @@
   _ArgumentsNode(this.positionalArguments, this.namedArguments);
 }
 
+// Coverage-ignore(suite): Not run.
 class _MacroArgumentNode implements _Node {
   Object? get value => argument.value;
 
@@ -112,18 +119,21 @@
   _MacroArgumentNode(this.argument);
 }
 
+// Coverage-ignore(suite): Not run.
 class _TokenNode implements _Node {
   final Token token;
 
   _TokenNode(this.token);
 }
 
+// Coverage-ignore(suite): Not run.
 class _NamedArgumentIdentifierNode implements _Node {
   final String name;
 
   _NamedArgumentIdentifierNode(this.name);
 }
 
+// Coverage-ignore(suite): Not run.
 class _NamedArgumentNode implements _Node {
   final String name;
   final macro.Argument argument;
@@ -133,6 +143,7 @@
   _NamedArgumentNode(this.name, this.argument);
 }
 
+// Coverage-ignore(suite): Not run.
 class _MacroListener implements Listener {
   ClassBuilder? _macroClassBuilder;
 
diff --git a/pkg/front_end/lib/src/kernel/macro/identifiers.dart b/pkg/front_end/lib/src/kernel/macro/identifiers.dart
index 2600e3e..4a7b276 100644
--- a/pkg/front_end/lib/src/kernel/macro/identifiers.dart
+++ b/pkg/front_end/lib/src/kernel/macro/identifiers.dart
@@ -17,6 +17,7 @@
 import '../../builder/type_builder.dart';
 import 'introspectors.dart';
 
+// Coverage-ignore(suite): Not run.
 abstract class IdentifierImpl extends macro.IdentifierImpl {
   IdentifierImpl({
     required int id,
@@ -97,6 +98,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class TypeBuilderIdentifier extends IdentifierImpl {
   final TypeBuilder typeBuilder;
   final LibraryBuilder libraryBuilder;
@@ -147,6 +149,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class TypeDeclarationBuilderIdentifier extends IdentifierImpl {
   final TypeDeclarationBuilder typeDeclarationBuilder;
   final LibraryBuilder libraryBuilder;
@@ -191,6 +194,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class MemberBuilderIdentifier extends IdentifierImpl {
   final MemberBuilder memberBuilder;
 
@@ -232,6 +236,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class FormalParameterBuilderIdentifier extends IdentifierImpl {
   final LibraryBuilder libraryBuilder;
   final FormalParameterBuilder parameterBuilder;
@@ -266,6 +271,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class OmittedTypeIdentifier extends IdentifierImpl {
   OmittedTypeIdentifier({required int id}) : super(id: id, name: 'dynamic');
 
diff --git a/pkg/front_end/lib/src/kernel/macro/introspectors.dart b/pkg/front_end/lib/src/kernel/macro/introspectors.dart
index ba7a3a6..5a050c3 100644
--- a/pkg/front_end/lib/src/kernel/macro/introspectors.dart
+++ b/pkg/front_end/lib/src/kernel/macro/introspectors.dart
@@ -25,6 +25,7 @@
 import 'identifiers.dart';
 import 'types.dart';
 
+// Coverage-ignore(suite): Not run.
 class MacroIntrospection {
   final SourceLoader _sourceLoader;
   late final MacroTypes types = new MacroTypes(this, _sourceLoader);
@@ -666,6 +667,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _TypePhaseIntrospector implements macro.TypePhaseIntrospector {
   final SourceLoader sourceLoader;
 
@@ -713,6 +715,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _DeclarationPhaseIntrospector extends _TypePhaseIntrospector
     implements macro.DeclarationPhaseIntrospector {
   final ClassHierarchyBuilder classHierarchy;
@@ -847,6 +850,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _DefinitionPhaseIntrospector extends _DeclarationPhaseIntrospector
     implements macro.DefinitionPhaseIntrospector {
   _DefinitionPhaseIntrospector(
diff --git a/pkg/front_end/lib/src/kernel/macro/macro.dart b/pkg/front_end/lib/src/kernel/macro/macro.dart
index 4693fc6..ffed42e 100644
--- a/pkg/front_end/lib/src/kernel/macro/macro.dart
+++ b/pkg/front_end/lib/src/kernel/macro/macro.dart
@@ -47,6 +47,7 @@
   List<Map<Uri, Map<String, List<String>>>> neededPrecompilations = [];
 }
 
+// Coverage-ignore(suite): Not run.
 class MacroApplication {
   final UriOffset uriOffset;
   final ClassBuilder classBuilder;
@@ -115,6 +116,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class MacroApplicationDataForTesting {
   Map<SourceLibraryBuilder, LibraryMacroApplicationData> libraryData = {};
   Map<SourceLibraryBuilder, String> libraryTypesResult = {};
@@ -182,6 +184,7 @@
   List<macro.MacroExecutionResult> definitionsResults = [];
 }
 
+// Coverage-ignore(suite): Not run.
 class ApplicationDataForTesting {
   final ApplicationData applicationData;
   final MacroApplication macroApplication;
@@ -216,6 +219,7 @@
   Map<MemberBuilder, ApplicationData> memberApplications = {};
 }
 
+// Coverage-ignore(suite): Not run.
 /// Macro classes that need to be precompiled.
 class NeededPrecompilations {
   /// Map from library uris to macro class names and the names of constructor
@@ -226,6 +230,7 @@
   NeededPrecompilations(this.macroDeclarations);
 }
 
+// Coverage-ignore(suite): Not run.
 void checkMacroApplications(
     ClassHierarchy hierarchy,
     Class macroClass,
@@ -396,6 +401,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class MacroApplications {
   final SourceLoader _sourceLoader;
   final macro.MacroExecutor _macroExecutor;
@@ -1262,6 +1268,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 macro.DeclarationKind _declarationKind(macro.Declaration declaration) {
   if (declaration is macro.ConstructorDeclaration) {
     return macro.DeclarationKind.constructor;
@@ -1286,6 +1293,7 @@
       "Unexpected declaration ${declaration} (${declaration.runtimeType})");
 }
 
+// Coverage-ignore(suite): Not run.
 /// Data needed to apply a list of macro applications to a macro target.
 abstract class ApplicationData {
   final MacroIntrospection _macroIntrospection;
@@ -1304,6 +1312,7 @@
   String get textForTesting;
 }
 
+// Coverage-ignore(suite): Not run.
 class LibraryApplicationData extends ApplicationData {
   macro.MacroTarget? _macroTarget;
 
@@ -1325,6 +1334,7 @@
   String get textForTesting => libraryBuilder.importUri.toString();
 }
 
+// Coverage-ignore(suite): Not run.
 /// Data needed to apply a list of macro applications to a class or member.
 abstract class DeclarationApplicationData extends ApplicationData {
   macro.Declaration? _declaration;
@@ -1341,6 +1351,7 @@
   macro.DeclarationKind get declarationKind => _declarationKind(declaration);
 }
 
+// Coverage-ignore(suite): Not run.
 class ClassApplicationData extends DeclarationApplicationData {
   final SourceClassBuilder _classBuilder;
 
@@ -1360,6 +1371,7 @@
   String get textForTesting => _classBuilder.name;
 }
 
+// Coverage-ignore(suite): Not run.
 class ExtensionTypeApplicationData extends DeclarationApplicationData {
   final SourceExtensionTypeDeclarationBuilder _extensionTypeDeclarationBuilder;
 
@@ -1379,6 +1391,7 @@
   String get textForTesting => _extensionTypeDeclarationBuilder.name;
 }
 
+// Coverage-ignore(suite): Not run.
 class MemberApplicationData extends DeclarationApplicationData {
   final MemberBuilder _memberBuilder;
 
@@ -1406,6 +1419,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension on macro.MacroExecutionResult {
   bool get isNotEmpty =>
       enumValueAugmentations.isNotEmpty ||
@@ -1470,6 +1484,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension DeclarationKindHelper on macro.DeclarationKind {
   /// Returns the plural form description for the declaration kind.
   String plural() => switch (this) {
diff --git a/pkg/front_end/lib/src/kernel/macro/offsets.dart b/pkg/front_end/lib/src/kernel/macro/offsets.dart
index 64a722f..0b4829f 100644
--- a/pkg/front_end/lib/src/kernel/macro/offsets.dart
+++ b/pkg/front_end/lib/src/kernel/macro/offsets.dart
@@ -6,6 +6,7 @@
 
 import 'package:kernel/ast.dart';
 
+// Coverage-ignore(suite): Not run.
 /// Class that maps offsets from an intermediate augmentation library to the
 /// merged augmentation library.
 class ReOffset {
@@ -70,6 +71,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Recursive visitor that tracks the current file URI.
 abstract class FileUriVisitor extends RecursiveVisitor {
   /// Called before the `FileUriNode` [node] is visited.
@@ -183,6 +185,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Visitor that replaces offsets in intermediate augmentation libraries with
 /// the offsets for the merged augmentation libraries.
 class ReOffsetVisitor extends FileUriVisitor {
@@ -287,6 +290,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// A range of file offset.
 ///
 /// Used to computed the file offsets of nested ranges.
@@ -302,6 +306,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension OffsetRangeExtension on OffsetRange? {
   OffsetRange include(OffsetRange range) {
     OffsetRange? self = this;
diff --git a/pkg/front_end/lib/src/kernel/macro/types.dart b/pkg/front_end/lib/src/kernel/macro/types.dart
index 265aa52..ab84a53 100644
--- a/pkg/front_end/lib/src/kernel/macro/types.dart
+++ b/pkg/front_end/lib/src/kernel/macro/types.dart
@@ -21,9 +21,11 @@
 import 'identifiers.dart';
 import 'introspectors.dart';
 
+// Coverage-ignore(suite): Not run.
 final IdentifierImpl omittedTypeIdentifier =
     new OmittedTypeIdentifier(id: macro.RemoteInstance.uniqueId);
 
+// Coverage-ignore(suite): Not run.
 class MacroTypes {
   final MacroIntrospection _introspection;
   final SourceLoader _sourceLoader;
@@ -311,6 +313,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _StaticTypeImpl extends macro.StaticTypeImpl {
   final MacroTypes types;
   final DartType type;
@@ -369,6 +372,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _NamedStaticTypeImpl extends _StaticTypeImpl
     implements macro.NamedStaticType {
   @override
@@ -386,6 +390,7 @@
   });
 }
 
+// Coverage-ignore(suite): Not run.
 // ignore: missing_override_of_must_be_overridden
 class _OmittedTypeAnnotationImpl extends macro.OmittedTypeAnnotationImpl {
   final OmittedTypeBuilder typeBuilder;
diff --git a/pkg/front_end/lib/src/kernel/member_covariance.dart b/pkg/front_end/lib/src/kernel/member_covariance.dart
index 96eff2aa..c594717 100644
--- a/pkg/front_end/lib/src/kernel/member_covariance.dart
+++ b/pkg/front_end/lib/src/kernel/member_covariance.dart
@@ -241,12 +241,14 @@
     if (_typeParameters == null) {
       typeParameters = other._typeParameters;
     } else if (other._typeParameters == null) {
+      // Coverage-ignore-block(suite): Not run.
       typeParameters = _typeParameters;
     } else {
       typeParameters = new List<bool>.filled(
           max(_typeParameters.length, other._typeParameters.length), false);
       for (int index = 0; index < typeParameters.length; index++) {
         typeParameters[index] = isTypeParameterGenericCovariantImpl(index) ||
+            // Coverage-ignore(suite): Not run.
             other.isTypeParameterGenericCovariantImpl(index);
       }
     }
diff --git a/pkg/front_end/lib/src/kernel/resource_identifier.dart b/pkg/front_end/lib/src/kernel/resource_identifier.dart
index 3880510..ccbc6a4 100644
--- a/pkg/front_end/lib/src/kernel/resource_identifier.dart
+++ b/pkg/front_end/lib/src/kernel/resource_identifier.dart
@@ -26,12 +26,15 @@
         .where((instance) => isResourceIdentifier(instance.classNode))
         .toList(growable: false);
 
+// Coverage-ignore(suite): Not run.
 final Uri _metaLibraryUri = new Uri(scheme: 'package', path: 'meta/meta.dart');
 
 bool isResourceIdentifier(Class classNode) =>
     classNode.name == 'ResourceIdentifier' &&
+    // Coverage-ignore(suite): Not run.
     classNode.enclosingLibrary.importUri == _metaLibraryUri;
 
+// Coverage-ignore(suite): Not run.
 /// Report if the resource annotations is placed on anything but a static
 /// method.
 void validateResourceIdentifierDeclaration(
diff --git a/pkg/front_end/lib/src/kernel/static_weak_references.dart b/pkg/front_end/lib/src/kernel/static_weak_references.dart
index a035be7..8292ab6 100644
--- a/pkg/front_end/lib/src/kernel/static_weak_references.dart
+++ b/pkg/front_end/lib/src/kernel/static_weak_references.dart
@@ -23,6 +23,7 @@
 class StaticWeakReferences {
   static const String weakTearoffReferencePragma = 'weak-tearoff-reference';
 
+  // Coverage-ignore(suite): Not run.
   static bool isWeakReference(StaticInvocation node) =>
       node.target.hasWeakTearoffReferencePragma;
 
@@ -47,6 +48,7 @@
     return false;
   }
 
+  // Coverage-ignore(suite): Not run.
   static void validateWeakReferenceUse(
       StaticInvocation node, ErrorReporter errorReporter) {
     final Arguments arguments = node.arguments;
@@ -76,6 +78,7 @@
         .withLocation(node.location!.file, node.fileOffset, 1));
   }
 
+  // Coverage-ignore(suite): Not run.
   static void validateWeakReferenceDeclaration(
       Annotatable node, ErrorReporter errorReporter) {
     if (node is! Procedure ||
@@ -105,6 +108,7 @@
     node.hasWeakTearoffReferencePragma = true;
   }
 
+  // Coverage-ignore(suite): Not run.
   // Returns argument expression of the weak reference.
   // Assumes weak reference is valid.
   static Expression getWeakReferenceArgument(StaticInvocation node) {
@@ -112,6 +116,7 @@
     return node.arguments.positional.single;
   }
 
+  // Coverage-ignore(suite): Not run.
   // Returns target method of the weak reference.
   // Assumes weak reference is valid.
   static Procedure getWeakReferenceTarget(StaticInvocation node) {
diff --git a/pkg/front_end/lib/src/kernel/try_constant_evaluator.dart b/pkg/front_end/lib/src/kernel/try_constant_evaluator.dart
index d7a8330..a60c95c 100644
--- a/pkg/front_end/lib/src/kernel/try_constant_evaluator.dart
+++ b/pkg/front_end/lib/src/kernel/try_constant_evaluator.dart
@@ -48,6 +48,7 @@
             enableTripleShift: true);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Constant evaluate(StaticTypeContext staticTypeContext, Expression node,
       {TreeNode? contextNode}) {
     return evaluateOrNull(staticTypeContext, node, contextNode: contextNode)!;
@@ -62,6 +63,7 @@
       {TreeNode? contextNode, bool requireConstant = true}) {
     errorReporter.requiresConstant = requireConstant;
     if (node is ConstantExpression) {
+      // Coverage-ignore-block(suite): Not run.
       Constant constant = node.constant;
       // TODO(fishythefish): Add more control over what to do with
       // [UnevaluatedConstant]s.
@@ -80,6 +82,7 @@
       return constant;
     }
     if (requireConstant) {
+      // Coverage-ignore-block(suite): Not run.
       return super.evaluate(staticTypeContext, node, contextNode: contextNode);
     } else {
       Constant constant =
@@ -102,11 +105,13 @@
   @override
   void report(LocatedMessage message, [List<LocatedMessage>? context]) {
     if (requiresConstant) {
+      // Coverage-ignore-block(suite): Not run.
       _reportError(message, context);
     }
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// [Constant] visitor that returns `true` if the visitor constant contains
 /// an [UnevaluatedConstant].
 class UnevaluatedConstantFinder extends ComputeOnceConstantVisitor<bool> {
diff --git a/pkg/front_end/lib/src/kernel/type_algorithms.dart b/pkg/front_end/lib/src/kernel/type_algorithms.dart
index 70177f7..edd51ec 100644
--- a/pkg/front_end/lib/src/kernel/type_algorithms.dart
+++ b/pkg/front_end/lib/src/kernel/type_algorithms.dart
@@ -127,6 +127,7 @@
         case ExtensionBuilder():
         case InvalidTypeDeclarationBuilder():
         case BuiltinTypeDeclarationBuilder():
+        // Coverage-ignore(suite): Not run.
         // TODO(johnniwinther): How should we handle this case?
         case OmittedTypeDeclarationBuilder():
         case null:
@@ -376,15 +377,19 @@
           newArguments[i] = substitutedArgument;
         }
       }
+    // Coverage-ignore(suite): Not run.
     case NominalVariableBuilder():
       // Handled above.
       throw new UnsupportedError("Unexpected NominalVariableBuilder");
+    // Coverage-ignore(suite): Not run.
     case StructuralVariableBuilder():
       // Handled above.
       throw new UnsupportedError("Unexpected StructuralVariableBuilder");
+    // Coverage-ignore(suite): Not run.
     case InvalidTypeDeclarationBuilder():
       // Don't substitute.
       break;
+    // Coverage-ignore(suite): Not run.
     case ExtensionBuilder():
     case BuiltinTypeDeclarationBuilder():
     // TODO(johnniwinther): How should we handle this case?
@@ -748,12 +753,17 @@
       }
       break;
     case FunctionTypeBuilder(
+        // Coverage-ignore(suite): Not run.
         :List<StructuralVariableBuilder>? typeVariables,
+        // Coverage-ignore(suite): Not run.
         :List<ParameterBuilder>? formals,
+        // Coverage-ignore(suite): Not run.
         :TypeBuilder returnType
       ):
+      // Coverage-ignore(suite): Not run.
       uses.addAll(findVariableUsesInType(variable, returnType));
       if (typeVariables != null) {
+        // Coverage-ignore-block(suite): Not run.
         for (StructuralVariableBuilder dependentVariable in typeVariables) {
           if (dependentVariable.bound != null) {
             uses.addAll(
@@ -766,6 +776,7 @@
         }
       }
       if (formals != null) {
+        // Coverage-ignore-block(suite): Not run.
         for (ParameterBuilder formal in formals) {
           uses.addAll(findVariableUsesInType(variable, formal.type));
         }
@@ -780,6 +791,7 @@
         }
       }
       if (namedFields != null) {
+        // Coverage-ignore-block(suite): Not run.
         for (RecordTypeFieldBuilder field in namedFields) {
           uses.addAll(findVariableUsesInType(variable, field.type));
         }
@@ -868,6 +880,7 @@
                 }
               }
               if (hasInbound) {
+                // Coverage-ignore-block(suite): Not run.
                 typesAndDependencies.add(type);
                 typesAndDependencies.add(const <Object>[]);
               }
@@ -887,6 +900,7 @@
                   List<Object> dependencies =
                       findInboundReferences(type.typeVariables!);
                   if (dependencies.length != 0) {
+                    // Coverage-ignore-block(suite): Not run.
                     typesAndDependencies.add(type);
                     typesAndDependencies.add(dependencies);
                   }
@@ -898,6 +912,7 @@
               List<Object> dependencies =
                   findInboundReferences(declaration.typeParameters!);
               if (dependencies.length != 0) {
+                // Coverage-ignore-block(suite): Not run.
                 typesAndDependencies.add(type);
                 typesAndDependencies.add(dependencies);
               }
@@ -907,6 +922,7 @@
           case ExtensionBuilder():
           case InvalidTypeDeclarationBuilder():
           case BuiltinTypeDeclarationBuilder():
+          // Coverage-ignore(suite): Not run.
           // TODO(johnniwinther): How should we handle this case?
           case OmittedTypeDeclarationBuilder():
           case null:
@@ -931,6 +947,7 @@
                 .addAll(findRawTypesWithInboundReferences(variable.bound));
           }
           if (variable.defaultType != null) {
+            // Coverage-ignore-block(suite): Not run.
             typesAndDependencies.addAll(
                 findRawTypesWithInboundReferences(variable.defaultType));
           }
@@ -1094,6 +1111,7 @@
                 visitTypeVariables(type.typeVariables);
               }
             case ExtensionBuilder():
+              // Coverage-ignore(suite): Not run.
               visitTypeVariables(declaration.typeParameters);
             case ExtensionTypeDeclarationBuilder():
               visitTypeVariables(declaration.typeParameters);
@@ -1110,6 +1128,7 @@
             case BuiltinTypeDeclarationBuilder():
               // Do nothing.
               break;
+            // Coverage-ignore(suite): Not run.
             // TODO(johnniwinther): How should we handle this case?
             case OmittedTypeDeclarationBuilder():
             case null:
@@ -1136,6 +1155,7 @@
                 findRawTypePathsToDeclaration(variable.bound, end, visited));
           }
           if (variable.defaultType != null) {
+            // Coverage-ignore-block(suite): Not run.
             paths.addAll(findRawTypePathsToDeclaration(
                 variable.defaultType, end, visited));
           }
@@ -1492,5 +1512,6 @@
 
   RawTypeCycleElement(this.type, this.typeVariable)
       : assert(typeVariable is NominalVariableBuilder? ||
+            // Coverage-ignore(suite): Not run.
             typeVariable is StructuralVariableBuilder?);
 }
diff --git a/pkg/front_end/lib/src/kernel/type_builder_computer.dart b/pkg/front_end/lib/src/kernel/type_builder_computer.dart
index 58b5a1a..a2d2344 100644
--- a/pkg/front_end/lib/src/kernel/type_builder_computer.dart
+++ b/pkg/front_end/lib/src/kernel/type_builder_computer.dart
@@ -101,6 +101,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder visitNeverType(NeverType node,
       Map<TypeParameter, NominalVariableBuilder> pendingNominalVariables) {
     return new NamedTypeBuilderImpl.forDartType(node, neverDeclaration,
@@ -150,6 +151,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder visitFutureOrType(FutureOrType node,
       Map<TypeParameter, NominalVariableBuilder> pendingNominalVariables) {
     TypeBuilder argument =
@@ -244,12 +246,14 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder visitIntersectionType(IntersectionType node,
       Map<TypeParameter, NominalVariableBuilder> pendingNominalVariables) {
     throw "Not implemented";
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeBuilder visitTypedefType(TypedefType node,
       Map<TypeParameter, NominalVariableBuilder> pendingNominalVariables) {
     throw "Not implemented";
diff --git a/pkg/front_end/lib/src/kernel/utils.dart b/pkg/front_end/lib/src/kernel/utils.dart
index c9bd4b2..24b0d94 100644
--- a/pkg/front_end/lib/src/kernel/utils.dart
+++ b/pkg/front_end/lib/src/kernel/utils.dart
@@ -45,6 +45,7 @@
 /// 'Never' from 'dart:core'.
 const String exportNeverSentinel = '<Never>';
 
+// Coverage-ignore(suite): Not run.
 void printNodeOn(Node? node, StringSink sink, {NameSystem? syntheticNames}) {
   if (node == null) {
     sink.write("null");
@@ -54,6 +55,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 void printQualifiedNameOn(Member? member, StringSink sink) {
   if (member == null) {
     sink.write("null");
@@ -69,6 +71,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Print the given [component].  Do nothing if it is `null`.  If the
 /// [libraryFilter] is provided, then only libraries that satisfy it are
 /// printed.
@@ -86,6 +89,7 @@
   print(sb);
 }
 
+// Coverage-ignore(suite): Not run.
 /// Write [component] to file only including libraries that match [filter].
 Future<Null> writeComponentToFile(Component component, Uri uri,
     {bool Function(Library library)? filter}) async {
@@ -99,6 +103,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Serialize the libraries in [component] that match [filter].
 Uint8List serializeComponent(Component component,
     {bool Function(Library library)? filter,
@@ -115,6 +120,7 @@
 
 const String kDebugClassName = "#DebugClass";
 
+// Coverage-ignore(suite): Not run.
 class _CollectLibraryDependencies extends RecursiveVisitor {
   Set<LibraryDependency> foundLibraryDependencies = {};
 
@@ -129,6 +135,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 Component createExpressionEvaluationComponent(Procedure procedure) {
   Library realLibrary = procedure.enclosingLibrary;
 
@@ -195,6 +202,7 @@
   return component;
 }
 
+// Coverage-ignore(suite): Not run.
 List<int> serializeProcedure(Procedure procedure) {
   return serializeComponent(createExpressionEvaluationComponent(procedure));
 }
@@ -209,6 +217,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void close() {}
 }
 
diff --git a/pkg/front_end/lib/src/kernel/verifier.dart b/pkg/front_end/lib/src/kernel/verifier.dart
index 4d9c1e5..d2027eb 100644
--- a/pkg/front_end/lib/src/kernel/verifier.dart
+++ b/pkg/front_end/lib/src/kernel/verifier.dart
@@ -33,6 +33,7 @@
   return listener.errors;
 }
 
+// Coverage-ignore(suite): Not run.
 class FastaVerificationErrorListener implements VerificationErrorListener {
   List<LocatedMessage> errors = [];
 
diff --git a/pkg/front_end/lib/src/kernel_generator_impl.dart b/pkg/front_end/lib/src/kernel_generator_impl.dart
index 54ffb8a..a84e03d 100644
--- a/pkg/front_end/lib/src/kernel_generator_impl.dart
+++ b/pkg/front_end/lib/src/kernel_generator_impl.dart
@@ -38,6 +38,7 @@
     show MacroConfiguration, computeMacroConfiguration;
 import 'source/source_loader.dart' show SourceLoader;
 
+// Coverage-ignore(suite): Not run.
 /// Implementation for the
 /// `package:front_end/src/api_prototype/kernel_generator.dart` and
 /// `package:front_end/src/api_prototype/summary_generator.dart` APIs.
@@ -102,6 +103,7 @@
           dillTarget.loader.appendLibraries(additionalDill);
         }
       } else if (options.hasAdditionalDills) {
+        // Coverage-ignore-block(suite): Not run.
         nameRoot = sdkSummary?.root ?? new CanonicalName.root();
         for (Component additionalDill
             in await options.loadAdditionalDills(nameRoot)) {
@@ -119,15 +121,19 @@
       kernelTarget.setEntryPoints(options.inputs);
       NeededPrecompilations? neededPrecompilations =
           await kernelTarget.computeNeededPrecompilations();
-      kernelTarget.benchmarker?.enterPhase(BenchmarkPhases.precompileMacros);
+      kernelTarget.benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.enterPhase(BenchmarkPhases.precompileMacros);
       Map<Uri, ExecutorFactoryToken>? precompiled =
           await precompileMacros(neededPrecompilations, options);
       if (precompiled != null) {
+        // Coverage-ignore-block(suite): Not run.
         kernelTarget.benchmarker
             ?.enterPhase(BenchmarkPhases.unknownGenerateKernelInternal);
         continue;
       }
       kernelTarget.benchmarker
+          // Coverage-ignore(suite): Not run.
           ?.enterPhase(BenchmarkPhases.unknownGenerateKernelInternal);
       return _buildInternal(
           options: options,
@@ -144,6 +150,7 @@
           retainDataForTesting: retainDataForTesting);
     }
   },
+      // Coverage-ignore(suite): Not run.
       () =>
           sourceLoader?.currentUriForCrashReporting ??
           new UriOffset(options.inputs.first, TreeNode.noOffset));
@@ -167,6 +174,7 @@
   Component summaryComponent = buildResult.component!;
   List<int>? summary = null;
   if (buildSummary) {
+    // Coverage-ignore-block(suite): Not run.
     if (options.verify) {
       List<LocatedMessage> errors = verifyComponent(
           options.target, VerificationStage.outline, summaryComponent);
@@ -233,6 +241,7 @@
         verify: options.verify);
     component = buildResult.component;
     if (options.debugDump) {
+      // Coverage-ignore-block(suite): Not run.
       printComponentText(component,
           libraryFilter: kernelTarget.isSourceLibraryForDebugging,
           showOffsets: options.debugDumpShowOffsets);
@@ -243,7 +252,9 @@
   }
   // TODO(johnniwinther): Should we reuse the macro executor on subsequent
   // compilations where possible?
-  buildResult.macroApplications?.close();
+  buildResult.macroApplications
+      // Coverage-ignore(suite): Not run.
+      ?.close();
 
   return new InternalCompilerResult(
       summary: summary,
@@ -303,6 +314,7 @@
       this.kernelTargetForTesting});
 }
 
+// Coverage-ignore(suite): Not run.
 /// A fake absolute directory used as the root of a memory-file system in the
 /// compilation below.
 final Uri _defaultDir = Uri.parse('org-dartlang-macro:///a/b/c/');
@@ -318,6 +330,7 @@
 Future<Map<Uri, ExecutorFactoryToken>?> precompileMacros(
     NeededPrecompilations? neededPrecompilations,
     ProcessedOptions options) async {
+  // Coverage-ignore-block(suite): Not run.
   if (neededPrecompilations != null) {
     if (options.globalFeatures.macros.isEnabled) {
       // TODO(johnniwinther): Avoid using [rawOptionsForTesting] to compute
@@ -336,6 +349,7 @@
   return null;
 }
 
+// Coverage-ignore(suite): Not run.
 Future<Map<Uri, ExecutorFactoryToken>?> _compileMacros(
     NeededPrecompilations neededPrecompilations,
     ProcessedOptions options) async {
diff --git a/pkg/front_end/lib/src/macros/isolate_macro_serializer.dart b/pkg/front_end/lib/src/macros/isolate_macro_serializer.dart
index 2788ad6..db5718f 100644
--- a/pkg/front_end/lib/src/macros/isolate_macro_serializer.dart
+++ b/pkg/front_end/lib/src/macros/isolate_macro_serializer.dart
@@ -8,6 +8,7 @@
 
 import 'macro_serializer.dart';
 
+// Coverage-ignore(suite): Not run.
 /// [MacroSerializer] that uses blobs registered with the current [Isolate] to
 /// give access to precompiled macro [Component]s.
 ///
diff --git a/pkg/front_end/lib/src/macros/macro_serializer.dart b/pkg/front_end/lib/src/macros/macro_serializer.dart
index 68425ea..da10ae0 100644
--- a/pkg/front_end/lib/src/macros/macro_serializer.dart
+++ b/pkg/front_end/lib/src/macros/macro_serializer.dart
@@ -8,6 +8,7 @@
 import 'isolate_macro_serializer.dart';
 import 'temp_dir_macro_serializer.dart';
 
+// Coverage-ignore(suite): Not run.
 /// Interface for supporting serialization of [Component]s for macro
 /// precompilation.
 abstract class MacroSerializer {
diff --git a/pkg/front_end/lib/src/macros/macro_target.dart b/pkg/front_end/lib/src/macros/macro_target.dart
index aea3fd0..3e31eed 100644
--- a/pkg/front_end/lib/src/macros/macro_target.dart
+++ b/pkg/front_end/lib/src/macros/macro_target.dart
@@ -7,9 +7,11 @@
 import 'macro_target_unsupported.dart'
     if (dart.library.io) 'macro_target_io.dart' as impl;
 
+// Coverage-ignore(suite): Not run.
 MacroConfiguration computeMacroConfiguration({Uri? targetSdkSummary}) =>
     impl.computeMacroConfiguration(targetSdkSummary: targetSdkSummary);
 
+// Coverage-ignore(suite): Not run.
 class MacroConfiguration {
   final Target target;
   final Uri? sdkSummary;
diff --git a/pkg/front_end/lib/src/macros/macro_target_io.dart b/pkg/front_end/lib/src/macros/macro_target_io.dart
index 66920e7..c231c82 100644
--- a/pkg/front_end/lib/src/macros/macro_target_io.dart
+++ b/pkg/front_end/lib/src/macros/macro_target_io.dart
@@ -9,6 +9,7 @@
 
 import 'macro_target.dart';
 
+// Coverage-ignore(suite): Not run.
 MacroConfiguration computeMacroConfiguration({Uri? targetSdkSummary}) {
   // Force the SDK summary to "vm_platform_strong.dill".
   // TODO(54404): make this sufficiently correct for all use cases.
@@ -19,6 +20,7 @@
       sdkSummary: _findSdkSummary(targetSdkSummary: targetSdkSummary));
 }
 
+// Coverage-ignore(suite): Not run.
 Uri _findSdkSummary({Uri? targetSdkSummary}) {
   if (targetSdkSummary?.path == 'virtual_platform_kernel.dill') {
     return targetSdkSummary!;
@@ -55,6 +57,7 @@
   throw new StateError('Unable to find platform dill to build macros.');
 }
 
+// Coverage-ignore(suite): Not run.
 // Looks for a directory `dart-sdk` in or above [directory].
 Directory? _findSdkDirectoryAbove(Directory directory) {
   while (directory.parent.path != directory.path) {
@@ -66,6 +69,7 @@
   return null;
 }
 
+// Coverage-ignore(suite): Not run.
 // Returns the `vm_platform_strong.dill` file under [sdkDirectory] if it
 // exists, or `null` if not.
 File? _findPlatformDillUnder(Directory sdkDirectory) {
diff --git a/pkg/front_end/lib/src/macros/temp_dir_macro_serializer.dart b/pkg/front_end/lib/src/macros/temp_dir_macro_serializer.dart
index ad800ae..27580f9 100644
--- a/pkg/front_end/lib/src/macros/temp_dir_macro_serializer.dart
+++ b/pkg/front_end/lib/src/macros/temp_dir_macro_serializer.dart
@@ -10,6 +10,7 @@
 import '../kernel/utils.dart';
 import 'macro_serializer.dart';
 
+// Coverage-ignore(suite): Not run.
 /// [MacroSerializer] that uses .dill files stored in a temporary directory to
 /// provided [Uri]s for precompiled macro [Component]s.
 ///
diff --git a/pkg/front_end/lib/src/source/class_declaration.dart b/pkg/front_end/lib/src/source/class_declaration.dart
index f1f0078..4fb9107 100644
--- a/pkg/front_end/lib/src/source/class_declaration.dart
+++ b/pkg/front_end/lib/src/source/class_declaration.dart
@@ -237,6 +237,7 @@
         includeDuplicates: includeDuplicates);
   }
 
+  // Coverage-ignore(suite): Not run.
   factory ClassDeclarationMemberIterator.local(D classBuilder,
       {required bool includeDuplicates}) {
     return new ClassDeclarationMemberIterator._(classBuilder, null,
@@ -274,9 +275,12 @@
   }
 
   @override
-  T get current => _iterator?.current ?? (throw new StateError('No element'));
+  T get current =>
+      _iterator?.current ?? // Coverage-ignore(suite): Not run.
+      (throw new StateError('No element'));
 }
 
+// Coverage-ignore(suite): Not run.
 class ClassDeclarationMemberNameIterator<D extends ClassDeclaration,
     T extends Builder> implements NameIterator<T> {
   NameIterator<T>? _iterator;
@@ -344,6 +348,7 @@
         includeDuplicates: includeDuplicates);
   }
 
+  // Coverage-ignore(suite): Not run.
   factory ClassDeclarationConstructorIterator.local(D classBuilder,
       {required bool includeDuplicates}) {
     return new ClassDeclarationConstructorIterator._(classBuilder, null,
@@ -382,7 +387,9 @@
   }
 
   @override
-  T get current => _iterator?.current ?? (throw new StateError('No element'));
+  T get current =>
+      _iterator?.current ?? // Coverage-ignore(suite): Not run.
+      (throw new StateError('No element'));
 }
 
 class ClassDeclarationConstructorNameIterator<D extends ClassDeclaration,
@@ -432,8 +439,12 @@
   }
 
   @override
-  T get current => _iterator?.current ?? (throw new StateError('No element'));
+  T get current =>
+      _iterator?.current ?? // Coverage-ignore(suite): Not run.
+      (throw new StateError('No element'));
 
   @override
-  String get name => _iterator?.name ?? (throw new StateError('No element'));
+  String get name =>
+      _iterator?.name ?? // Coverage-ignore(suite): Not run.
+      (throw new StateError('No element'));
 }
diff --git a/pkg/front_end/lib/src/source/diet_listener.dart b/pkg/front_end/lib/src/source/diet_listener.dart
index 0151481..57e271e 100644
--- a/pkg/front_end/lib/src/source/diet_listener.dart
+++ b/pkg/front_end/lib/src/source/diet_listener.dart
@@ -195,6 +195,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleNamedRecordField(Token colon) {
     debugEvent("NamedRecordField");
     pop(); // Named record field name.
@@ -236,6 +237,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleInvalidTypeArguments(Token token) {
     debugEvent("InvalidTypeArguments");
   }
@@ -262,7 +264,9 @@
     assert(count == 0); // Count is always 0 as the diet parser skips formals.
     if (kind != MemberKind.GeneralizedFunctionType &&
         identical(peek(), "-") &&
+        // Coverage-ignore(suite): Not run.
         identical(beginToken.next, endToken)) {
+      // Coverage-ignore-block(suite): Not run.
       pop();
       push("unary-");
     }
@@ -273,6 +277,7 @@
   void handleNoFormalParameters(Token token, MemberKind kind) {
     debugEvent("NoFormalParameters");
     if (identical(peek(), "-")) {
+      // Coverage-ignore-block(suite): Not run.
       pop();
       push("unary-");
     }
@@ -437,6 +442,7 @@
     Object? suffix = pop();
     Object? prefix = pop();
     if (prefix is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(prefix);
     } else if (suffix is ParserRecovery) {
       push(suffix);
@@ -457,6 +463,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void endLibraryAugmentation(
       Token augmentKeyword, Token libraryKeyword, Token semicolon) {
     debugEvent("endLibraryAugmentation");
@@ -492,6 +499,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleStringJuxtaposition(Token startToken, int literalCount) {
     debugEvent("StringJuxtaposition");
   }
@@ -519,6 +527,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleInvalidOperatorName(Token operatorKeyword, Token token) {
     debugEvent("InvalidOperatorName");
     push(new SimpleIdentifier(token));
@@ -705,11 +714,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleNativeFunctionBody(Token nativeToken, Token semicolon) {
     debugEvent("NativeFunctionBody");
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleNativeFunctionBodyIgnored(Token nativeToken, Token semicolon) {
     debugEvent("NativeFunctionBodyIgnored");
   }
@@ -783,6 +794,7 @@
       Builder? memberBuilder = _offsetMap.lookupProcedure(identifier);
       if (currentClass?.isEnum == true &&
           memberBuilder is SourceFieldBuilder &&
+          // Coverage-ignore(suite): Not run.
           memberBuilder.name == "values") {
         // This is the case of a method with the name 'values' declared in an
         // Enum. In that case the method is replaced with the synthesized field
@@ -820,6 +832,7 @@
       Scope? formalParameterScope,
       InferenceDataForTesting? inferenceDataForTesting}) {
     _benchmarker
+        // Coverage-ignore(suite): Not run.
         ?.beginSubdivide(BenchmarkSubdivides.diet_listener_createListener);
     // Note: we set thisType regardless of whether we are building a static
     // member, since that provides better error recovery.
@@ -838,7 +851,9 @@
         thisTypeParameters,
         typeInferrer,
         constantContext);
-    _benchmarker?.endSubdivide();
+    _benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.endSubdivide();
     return result;
   }
 
@@ -881,13 +896,18 @@
         thisVariable: builder.thisVariable,
         thisTypeParameters: builder.thisTypeParameters,
         formalParameterScope: formalParameterScope,
-        inferenceDataForTesting: builder.dataForTesting?.inferenceData);
+        inferenceDataForTesting: builder
+            .dataForTesting
+            // Coverage-ignore(suite): Not run.
+            ?.inferenceData);
   }
 
   void buildRedirectingFactoryMethod(Token token, SourceFunctionBuilder builder,
       MemberKind kind, Token? metadata) {
-    _benchmarker?.beginSubdivide(
-        BenchmarkSubdivides.diet_listener_buildRedirectingFactoryMethod);
+    _benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.beginSubdivide(
+            BenchmarkSubdivides.diet_listener_buildRedirectingFactoryMethod);
     final BodyBuilder listener = createFunctionListener(builder,
         inOutlineBuildingPhase: false, inMetadata: false, inConstFields: false);
     try {
@@ -904,19 +924,25 @@
       listener.pop(); // Pops formal parameters.
       listener.finishRedirectingFactoryBody();
       listener.checkEmpty(token.next!.charOffset);
-    } on DebugAbort {
+    }
+    // Coverage-ignore(suite): Not run.
+    on DebugAbort {
       rethrow;
     } catch (e, s) {
       throw new Crash(uri, token.charOffset, e, s);
     }
-    _benchmarker?.endSubdivide();
+    _benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.endSubdivide();
   }
 
   void buildFields(int count, Token token, bool isTopLevel) {
     assert(checkState(
         token, repeatedKind(ValueKinds.IdentifierOrParserRecovery, count)));
 
-    _benchmarker?.beginSubdivide(BenchmarkSubdivides.diet_listener_buildFields);
+    _benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.beginSubdivide(BenchmarkSubdivides.diet_listener_buildFields);
     List<Identifier?>? names =
         const FixedNullableList<Identifier>().pop(stack, count);
     Token? metadata = pop() as Token?;
@@ -934,12 +960,17 @@
                 inMetadata: false,
                 inConstFields: declaration.isConst),
             memberScope,
-            inferenceDataForTesting: declaration.dataForTesting?.inferenceData),
+            inferenceDataForTesting: declaration
+                .dataForTesting
+                // Coverage-ignore(suite): Not run.
+                ?.inferenceData),
         token,
         metadata,
         isTopLevel);
     checkEmpty(token.charOffset);
-    _benchmarker?.endSubdivide();
+    _benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.endSubdivide();
   }
 
   @override
@@ -976,6 +1007,7 @@
     assert(currentDeclaration == null);
     assert(memberScope == libraryBuilder.scope);
     if (name is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       currentClassIsParserRecovery = true;
       return;
     }
@@ -1225,8 +1257,10 @@
       listener.pop() as AsyncMarker?;
 
   void buildPrimaryConstructor(BodyBuilder bodyBuilder, Token startToken) {
-    _benchmarker?.beginSubdivide(
-        BenchmarkSubdivides.diet_listener_buildPrimaryConstructor);
+    _benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.beginSubdivide(
+            BenchmarkSubdivides.diet_listener_buildPrimaryConstructor);
     Token token = startToken;
     try {
       Parser parser = new Parser(bodyBuilder,
@@ -1239,8 +1273,12 @@
       bodyBuilder.handleNoInitializers();
       bodyBuilder.checkEmpty(token.charOffset);
       bodyBuilder.finishFunction(formals, AsyncMarker.Sync, null);
-      _benchmarker?.endSubdivide();
-    } on DebugAbort {
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.endSubdivide();
+    }
+    // Coverage-ignore(suite): Not run.
+    on DebugAbort {
       rethrow;
     } catch (e, s) {
       throw new Crash(uri, token.charOffset, e, s);
@@ -1250,6 +1288,7 @@
   void buildFunctionBody(BodyBuilder bodyBuilder, Token startToken,
       Token? metadata, MemberKind kind) {
     _benchmarker
+        // Coverage-ignore(suite): Not run.
         ?.beginSubdivide(BenchmarkSubdivides.diet_listener_buildFunctionBody);
     Token token = startToken;
     try {
@@ -1276,15 +1315,23 @@
       bool isExpression = false;
       bool allowAbstract = asyncModifier == AsyncMarker.Sync;
 
-      _benchmarker?.beginSubdivide(BenchmarkSubdivides
-          .diet_listener_buildFunctionBody_parseFunctionBody);
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.beginSubdivide(BenchmarkSubdivides
+              .diet_listener_buildFunctionBody_parseFunctionBody);
       parser.parseFunctionBody(token, isExpression, allowAbstract);
       Statement? body = bodyBuilder.pop() as Statement?;
-      _benchmarker?.endSubdivide();
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.endSubdivide();
       bodyBuilder.checkEmpty(token.charOffset);
       bodyBuilder.finishFunction(formals, asyncModifier, body);
-      _benchmarker?.endSubdivide();
-    } on DebugAbort {
+      _benchmarker
+          // Coverage-ignore(suite): Not run.
+          ?.endSubdivide();
+    }
+    // Coverage-ignore(suite): Not run.
+    on DebugAbort {
       rethrow;
     } catch (e, s) {
       throw new Crash(uri, token.charOffset, e, s);
diff --git a/pkg/front_end/lib/src/source/name_scheme.dart b/pkg/front_end/lib/src/source/name_scheme.dart
index a2740b5..1e12b50 100644
--- a/pkg/front_end/lib/src/source/name_scheme.dart
+++ b/pkg/front_end/lib/src/source/name_scheme.dart
@@ -62,9 +62,13 @@
       required ContainerName? containerName,
       required ContainerType containerType,
       bool isSynthesized = false}) {
-    assert(isSynthesized || fieldNameType == FieldNameType.Field,
+    assert(
+        isSynthesized || fieldNameType == FieldNameType.Field,
+        // Coverage-ignore(suite): Not run.
         "Unexpected field name type for non-synthesized field: $fieldNameType");
-    assert((containerName == null) == (containerType == ContainerType.Library),
+    assert(
+        (containerName == null) == (containerType == ContainerType.Library),
+        // Coverage-ignore(suite): Not run.
         "Missing container name for ${containerType}");
 
     String baseName;
@@ -117,12 +121,14 @@
             return new ExtensionProcedureName(
                 libraryName, containerName!, containerType, kind, name,
                 isStatic: isStatic);
+          // Coverage-ignore(suite): Not run.
           case ProcedureKind.Factory:
             throw new UnsupportedError('Unexpected procedure kind ${kind}');
         }
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   static String createProcedureNameForTesting(
       {required ContainerName? containerName,
       required ContainerType containerType,
@@ -162,12 +168,14 @@
             case ProcedureKind.Operator:
               kindInfix = '';
               break;
+            // Coverage-ignore(suite): Not run.
             case ProcedureKind.Factory:
               throw new UnsupportedError(
                   'Unexpected extension method kind ${kind}');
           }
         }
         return '${extensionName}|${kindInfix}${name}';
+      // Coverage-ignore(suite): Not run.
       case ContainerType.Library:
       case ContainerType.Class:
         return name;
@@ -358,7 +366,9 @@
   factory MemberName(LibraryName libraryName, String text) =>
       text.startsWith('_')
           ? new PrivateMemberName(libraryName, text)
-          : new PublicMemberName(text);
+          :
+          // Coverage-ignore(suite): Not run.
+          new PublicMemberName(text);
 
   /// Returns the current [Name] for this member name.
   Name get name;
@@ -387,6 +397,7 @@
         name = new Name(text);
 
   @override
+  // Coverage-ignore(suite): Not run.
   void updateMemberName() {}
 
   @override
diff --git a/pkg/front_end/lib/src/source/offset_map.dart b/pkg/front_end/lib/src/source/offset_map.dart
index 9bbacd34..ded97e8 100644
--- a/pkg/front_end/lib/src/source/offset_map.dart
+++ b/pkg/front_end/lib/src/source/offset_map.dart
@@ -32,26 +32,34 @@
   OffsetMap(this.uri);
 
   void registerImport(Token importKeyword, Import import) {
-    assert(importKeyword.lexeme == 'import',
+    assert(
+        importKeyword.lexeme == 'import',
+        // Coverage-ignore(suite): Not run.
         "Invalid token for import: $importKeyword.");
     _imports[importKeyword.charOffset] = import;
   }
 
   Import lookupImport(Token importKeyword) {
-    assert(importKeyword.lexeme == 'import',
+    assert(
+        importKeyword.lexeme == 'import',
+        // Coverage-ignore(suite): Not run.
         "Invalid token for import: $importKeyword.");
     return _checkDirective(_imports[importKeyword.charOffset], '<import>',
         importKeyword.charOffset);
   }
 
   void registerExport(Token exportKeyword, Export export) {
-    assert(exportKeyword.lexeme == 'export',
+    assert(
+        exportKeyword.lexeme == 'export',
+        // Coverage-ignore(suite): Not run.
         "Invalid token for export: $exportKeyword.");
     _exports[exportKeyword.charOffset] = export;
   }
 
   Export lookupExport(Token exportKeyword) {
-    assert(exportKeyword.lexeme == 'export',
+    assert(
+        exportKeyword.lexeme == 'export',
+        // Coverage-ignore(suite): Not run.
         "Invalid token for export: $exportKeyword.");
     return _checkDirective(_exports[exportKeyword.charOffset], '<export>',
         exportKeyword.charOffset);
@@ -59,13 +67,15 @@
 
   void registerPart(Token partKeyword, LibraryPart part) {
     assert(
-        partKeyword.lexeme == 'part', "Invalid token for part: $partKeyword.");
+        partKeyword.lexeme == 'part', // Coverage-ignore(suite): Not run.
+        "Invalid token for part: $partKeyword.");
     _parts[partKeyword.charOffset] = part;
   }
 
   LibraryPart lookupPart(Token partKeyword) {
     assert(
-        partKeyword.lexeme == 'part', "Invalid token for part: $partKeyword.");
+        partKeyword.lexeme == 'part', // Coverage-ignore(suite): Not run.
+        "Invalid token for part: $partKeyword.");
     return _checkDirective(
         _parts[partKeyword.charOffset], '<part>', partKeyword.charOffset);
   }
diff --git a/pkg/front_end/lib/src/source/outline_builder.dart b/pkg/front_end/lib/src/source/outline_builder.dart
index 7c573d6..5f2e227 100644
--- a/pkg/front_end/lib/src/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/source/outline_builder.dart
@@ -567,6 +567,7 @@
   void popDeclarationContext([DeclarationContext? expectedContext]) {
     assert(
         expectedContext == null || expectedContext == declarationContext,
+        // Coverage-ignore(suite): Not run.
         "Unexpected declaration context: "
         "Expected $expectedContext, actual $declarationContext.");
     _declarationContext = _declarationContext.tail!;
@@ -649,6 +650,7 @@
 
     Object? names = pop();
     if (names is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(names);
     } else {
       push(new CombinatorBuilder.hide(names as Iterable<String>,
@@ -661,6 +663,7 @@
     debugEvent("Show");
     Object? names = pop();
     if (names is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(names);
     } else {
       push(new CombinatorBuilder.show(names as Iterable<String>,
@@ -736,7 +739,9 @@
         pop(NullValues.Metadata) as List<MetadataBuilder>?;
     checkEmpty(importKeyword.charOffset);
     if (prefix is! Identifier?) {
-      assert(prefix is ParserRecovery,
+      assert(
+          prefix is ParserRecovery,
+          // Coverage-ignore(suite): Not run.
           "Unexpected prefix $prefix (${prefix.runtimeType}).");
       return;
     }
@@ -778,11 +783,13 @@
     int charOffset = popCharOffset();
     String uri = pop() as String;
     if (equalSign != null) {
+      // Coverage-ignore-block(suite): Not run.
       popCharOffset();
     }
     String condition = popIfNotNull(equalSign) as String? ?? "true";
     Object? dottedName = pop();
     if (dottedName is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       push(dottedName);
     } else {
       push(new Configuration(charOffset, dottedName as String, condition, uri));
@@ -797,6 +804,7 @@
 
     List<String>? names = popIdentifierList(count);
     if (names == null) {
+      // Coverage-ignore-block(suite): Not run.
       push(new ParserRecovery(firstIdentifier.charOffset));
     } else {
       push(names.join('.'));
@@ -842,6 +850,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleInvalidOperatorName(Token operatorKeyword, Token token) {
     debugEvent("handleInvalidOperatorName");
     push(new SimpleIdentifier(token));
@@ -904,6 +913,7 @@
       pop(); // Char offset.
       Object? name = pop();
       if (name is ParserRecovery) {
+        // Coverage-ignore-block(suite): Not run.
         nativeMethodName = '';
       } else {
         nativeMethodName = name as String; // String.
@@ -914,6 +924,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleStringJuxtaposition(Token startToken, int literalCount) {
     debugEvent("StringJuxtaposition");
     List<String> list =
@@ -933,6 +944,7 @@
     assert(checkState(
         null, repeatedKind(ValueKinds.IdentifierOrParserRecovery, count)));
     push(popIdentifierList(count) ??
+        // Coverage-ignore(suite): Not run.
         (count == 0 ? NullValues.IdentifierList : new ParserRecovery(-1)));
   }
 
@@ -946,11 +958,14 @@
     Object? suffix = pop();
     Object prefix = pop()!;
     if (prefix is! Identifier) {
+      // Coverage-ignore-block(suite): Not run.
       assert(prefix is ParserRecovery,
           "Unexpected prefix $prefix (${prefix.runtimeType})");
       push(prefix);
     } else if (suffix is! Identifier) {
-      assert(suffix is ParserRecovery,
+      assert(
+          suffix is ParserRecovery,
+          // Coverage-ignore(suite): Not run.
           "Unexpected suffix $suffix (${suffix.runtimeType})");
       push(suffix);
     } else {
@@ -981,6 +996,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void endLibraryAugmentation(
       Token augmentKeyword, Token libraryKeyword, Token semicolon) {
     debugEvent("endLibraryAugmentation");
@@ -1105,6 +1121,7 @@
     DeclarationContext declarationContext;
     switch (kind) {
       case DeclarationKind.TopLevel:
+        // Coverage-ignore(suite): Not run.
         throw new UnsupportedError('Unexpected top level body.');
       case DeclarationKind.Class:
         declarationContext = DeclarationContext.ClassBody;
@@ -1118,6 +1135,7 @@
       case DeclarationKind.ExtensionType:
         declarationContext = DeclarationContext.ExtensionTypeBody;
         break;
+      // Coverage-ignore(suite): Not run.
       case DeclarationKind.Enum:
         declarationContext = DeclarationContext.Enum;
         break;
@@ -1333,6 +1351,7 @@
     inAbstractOrSealedClass = false;
     checkEmpty(beginToken.charOffset);
     if (name is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       _builderFactory
           .endNestedDeclaration(
               TypeParameterScopeKind.classDeclaration, "<syntax-error>")
@@ -1440,14 +1459,18 @@
         pop(NullValues.Metadata) as List<MetadataBuilder>?;
     checkEmpty(beginToken.charOffset);
     if (name is ParserRecovery) {
+      // Coverage-ignore-block(suite): Not run.
       _builderFactory
           .endNestedDeclaration(
               TypeParameterScopeKind.mixinDeclaration, "<syntax-error>")
           .resolveNamedTypes(typeVariables, _problemReporting);
     } else {
       Identifier identifier = name as Identifier;
-      int startOffset =
-          metadata == null ? beginToken.charOffset : metadata.first.charOffset;
+      int startOffset = metadata == null
+          ? beginToken.charOffset
+          :
+          // Coverage-ignore(suite): Not run.
+          metadata.first.charOffset;
       String classNameForErrors = identifier.name;
       if (supertypeConstraints != null) {
         for (TypeBuilder supertype in supertypeConstraints) {
@@ -1854,6 +1877,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleNativeFunctionBody(Token nativeToken, Token semicolon) {
     debugEvent("NativeFunctionBody");
     if (nativeMethodName != null) {
@@ -1864,6 +1888,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleNativeFunctionBodyIgnored(Token nativeToken, Token semicolon) {
     debugEvent("NativeFunctionBodyIgnored");
   }
@@ -1881,6 +1906,7 @@
   void handleNoFunctionBody(Token token) {
     debugEvent("NoFunctionBody");
     if (nativeMethodName != null) {
+      // Coverage-ignore-block(suite): Not run.
       push(MethodBody.Regular);
     } else {
       push(MethodBody.Abstract);
@@ -1909,6 +1935,7 @@
     DeclarationContext declarationContext;
     switch (declarationKind) {
       case DeclarationKind.TopLevel:
+        // Coverage-ignore(suite): Not run.
         assert(
             false,
             "Expected top level method to be handled by "
@@ -1978,15 +2005,18 @@
       }
     }
     if (covariantToken != null) {
+      // Coverage-ignore-block(suite): Not run.
       modifiers ??= <Modifier>[];
       modifiers.add(Covariant);
     }
     if (varFinalOrConst != null) {
       String lexeme = varFinalOrConst.lexeme;
       if (identical('var', lexeme)) {
+        // Coverage-ignore-block(suite): Not run.
         modifiers ??= <Modifier>[];
         modifiers.add(Var);
       } else if (identical('final', lexeme)) {
+        // Coverage-ignore-block(suite): Not run.
         modifiers ??= <Modifier>[];
         modifiers.add(Final);
       } else {
@@ -2147,7 +2177,9 @@
         _builderFactory.endNestedDeclaration(scopeKind, "#method");
 
     if (identifier is! Identifier) {
-      assert(identifier is ParserRecovery,
+      assert(
+          identifier is ParserRecovery,
+          // Coverage-ignore(suite): Not run.
           "Unexpected identifier $identifier (${identifier.runtimeType})");
       nativeMethodName = null;
       inConstructor = false;
@@ -2188,6 +2220,7 @@
             template = templateOperatorParameterMismatch2;
             break;
 
+          // Coverage-ignore(suite): Not run.
           default:
             unhandled("$requiredArgumentCount", "operatorRequiredArgumentCount",
                 identifier.nameOffset, uri);
@@ -2224,8 +2257,11 @@
         isAbstract = false;
       }
       if (returnType != null && !returnType.isVoidType) {
-        addProblem(messageNonVoidReturnSetter,
-            returnType.charOffset ?? beginToken.charOffset, noLength);
+        addProblem(
+            messageNonVoidReturnSetter,
+            returnType.charOffset ?? // Coverage-ignore(suite): Not run.
+                beginToken.charOffset,
+            noLength);
         // Use implicit void as recovery.
         returnType = null;
       }
@@ -2233,8 +2269,11 @@
     if (operator == Operator.indexSet &&
         returnType != null &&
         !returnType.isVoidType) {
-      addProblem(messageNonVoidReturnOperator,
-          returnType.charOffset ?? beginToken.offset, noLength);
+      addProblem(
+          messageNonVoidReturnOperator,
+          returnType.charOffset ?? // Coverage-ignore(suite): Not run.
+              beginToken.offset,
+          noLength);
       // Use implicit void as recovery.
       returnType = null;
     }
@@ -2354,8 +2393,11 @@
         modifiers &= ~constMask;
       }
       if (returnType != null) {
-        addProblem(messageConstructorWithReturnType,
-            returnType.charOffset ?? beginToken.offset, noLength);
+        addProblem(
+            messageConstructorWithReturnType,
+            returnType.charOffset ?? // Coverage-ignore(suite): Not run.
+                beginToken.offset,
+            noLength);
         returnType = null;
       }
       final int startCharOffset =
@@ -2378,6 +2420,7 @@
               methodKind == _MethodKind.mixinConstructor);
     } else {
       if (isConst) {
+        // Coverage-ignore-block(suite): Not run.
         // TODO(danrubel): consider removing this
         // because it is an error to have a const method.
         modifiers &= ~constMask;
@@ -2455,6 +2498,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleNamedRecordField(Token colon) {
     debugEvent("handleNamedRecordField");
     assert(checkState(colon, [
@@ -2601,6 +2645,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleInvalidTypeArguments(Token token) {
     debugEvent("handleInvalidTypeArguments");
     pop(NullValues.TypeArguments);
@@ -2613,6 +2658,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleNonNullAssertExpression(Token bang) {}
 
   @override
@@ -2817,6 +2863,7 @@
       Object? last = pop();
       count--;
       if (last is ParserRecovery) {
+        // Coverage-ignore-block(suite): Not run.
         discard(count);
       } else if (last is List<FormalParameterBuilder>) {
         formals = const FixedNullableList<FormalParameterBuilder>()
@@ -2860,6 +2907,7 @@
           }
           if (formal.name == FormalParameterBuilder.noNameSentinel) continue;
           if (seenNames.containsKey(formal.name)) {
+            // Coverage-ignore-block(suite): Not run.
             addProblem(
                 templateDuplicatedParameterName.withArguments(formal.name),
                 formal.charOffset,
@@ -3040,7 +3088,9 @@
         EnumConstantInfo? info = enumConstantInfos[index];
         if (info == null) {
           parsedEnumConstantInfos = enumConstantInfos.take(index).toList();
-        } else if (parsedEnumConstantInfos != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (parsedEnumConstantInfos != null) {
           parsedEnumConstantInfos.add(info);
         }
       }
@@ -3068,6 +3118,7 @@
     if (identifier is Identifier) {
       if (enumConstantInfos == null) {
         if (!leftBrace.isSynthetic) {
+          // Coverage-ignore-block(suite): Not run.
           addProblem(messageEnumDeclarationEmpty, identifier.token.offset,
               identifier.token.length);
         }
@@ -3295,6 +3346,7 @@
       // Create a nested declaration that is ended below by
       // `library.addFunctionType`.
       if (name is ParserRecovery) {
+        // Coverage-ignore-block(suite): Not run.
         pop(NullValues.Metadata); // Metadata.
         _builderFactory
             .endNestedDeclaration(
@@ -3322,6 +3374,7 @@
           pop(NullValues.NominalVariables) as List<NominalVariableBuilder>?;
       name = pop();
       if (name is ParserRecovery) {
+        // Coverage-ignore-block(suite): Not run.
         pop(NullValues.Metadata); // Metadata.
         _builderFactory
             .endNestedDeclaration(
@@ -3486,6 +3539,7 @@
       /* metadata = */ ValueKinds.MetadataListOrNull,
     ]));
     if (externalToken != null && lateToken != null) {
+      // Coverage-ignore-block(suite): Not run.
       handleRecoverableError(
           messageExternalLateField, externalToken, externalToken);
       externalToken = null;
@@ -3539,7 +3593,9 @@
       handleRecoverableError(
           messageAbstractLateField, abstractToken, abstractToken);
       abstractToken = null;
-    } else if (externalToken != null && lateToken != null) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (externalToken != null && lateToken != null) {
       handleRecoverableError(
           messageExternalLateField, externalToken, externalToken);
       externalToken = null;
@@ -3650,6 +3706,7 @@
       typeParameters[index].bound = bound;
       if (variance != null) {
         if (!libraryFeatures.variance.isEnabled) {
+          // Coverage-ignore-block(suite): Not run.
           reportVarianceModifierNotEnabled(variance);
         }
         typeParameters[index].variance =
@@ -3668,6 +3725,7 @@
     }
 
     if (inConstructorName) {
+      // Coverage-ignore-block(suite): Not run.
       addProblem(messageConstructorWithTypeParameters,
           offsetForToken(beginToken), lengthOfSpan(beginToken, endToken));
       inConstructorName = false;
@@ -3745,6 +3803,7 @@
           // For entries that consist of their name only, all of the elements
           // of the constructor reference should be null.
           if (typeArguments != null || suffix != null) {
+            // Coverage-ignore-block(suite): Not run.
             _compilationUnit.reportFeatureNotEnabled(
                 libraryFeatures.enhancedEnums, uri, charOffset, noLength);
           }
@@ -3765,6 +3824,7 @@
     DeclarationContext declarationContext;
     switch (declarationKind) {
       case DeclarationKind.TopLevel:
+        // Coverage-ignore(suite): Not run.
         throw new UnsupportedError("Unexpected top level factory method.");
       case DeclarationKind.Class:
         declarationContext = DeclarationContext.ClassFactory;
@@ -3832,6 +3892,7 @@
     }
     List<MetadataBuilder>? metadata = pop() as List<MetadataBuilder>?;
     if (name is! Identifier) {
+      // Coverage-ignore-block(suite): Not run.
       assert(name is ParserRecovery,
           "Unexpected name $name (${name.runtimeType}).");
       _builderFactory.endNestedDeclaration(
@@ -3954,6 +4015,7 @@
   void handleConstFactory(Token constKeyword) {
     debugEvent("ConstFactory");
     if (!libraryFeatures.constFunctions.isEnabled) {
+      // Coverage-ignore-block(suite): Not run.
       handleRecoverableError(messageConstFactory, constKeyword, constKeyword);
     }
   }
@@ -4190,10 +4252,13 @@
         return false;
       case MemberKind.NonStaticMethod:
       case MemberKind.ExtensionTypeNonStaticMethod:
+      // Coverage-ignore(suite): Not run.
       // These can be inferred but cannot hold parameters so the cases are
       // dead code:
       case MemberKind.NonStaticField:
+      // Coverage-ignore(suite): Not run.
       case MemberKind.StaticField:
+      // Coverage-ignore(suite): Not run.
       case MemberKind.TopLevelField:
         return true;
     }
diff --git a/pkg/front_end/lib/src/source/redirecting_factory_body.dart b/pkg/front_end/lib/src/source/redirecting_factory_body.dart
index 1a239a5..db47a2d 100644
--- a/pkg/front_end/lib/src/source/redirecting_factory_body.dart
+++ b/pkg/front_end/lib/src/source/redirecting_factory_body.dart
@@ -32,6 +32,7 @@
     return new ConstructorInvocation(target, args)
       ..fileOffset = function.fileOffset;
   } else {
+    // Coverage-ignore-block(suite): Not run.
     throw 'Unexpected target for redirecting factory:'
         ' ${target.runtimeType} $target';
   }
diff --git a/pkg/front_end/lib/src/source/source_builder_mixins.dart b/pkg/front_end/lib/src/source/source_builder_mixins.dart
index 86fe95c..1661d36 100644
--- a/pkg/front_end/lib/src/source/source_builder_mixins.dart
+++ b/pkg/front_end/lib/src/source/source_builder_mixins.dart
@@ -60,6 +60,7 @@
       Builder? objectSetter =
           objectClassBuilder.lookupLocalMember(name, setter: true);
       if (objectGetter != null && !objectGetter.isStatic ||
+          // Coverage-ignore(suite): Not run.
           objectSetter != null && !objectSetter.isStatic) {
         addProblem(
             // TODO(johnniwinther): Use a different error message for extension
@@ -70,6 +71,7 @@
             name.length);
       }
       if (declaration.parent != this) {
+        // Coverage-ignore-block(suite): Not run.
         if (fileUri != declaration.parent!.fileUri) {
           unexpected("$fileUri", "${declaration.parent!.fileUri}", charOffset,
               fileUri);
@@ -107,10 +109,12 @@
             includeAugmentations: true));
     while (iterator.moveNext()) {
       SourceMemberBuilder declaration = iterator.current;
-      count += declaration.buildBodyNodes((
-          {required Member member,
-          Member? tearOff,
-          required BuiltMemberKind kind}) {
+      count += declaration.buildBodyNodes(
+          // Coverage-ignore(suite): Not run.
+          (
+              {required Member member,
+              Member? tearOff,
+              required BuiltMemberKind kind}) {
         _buildMember(declaration, member, tearOff, kind,
             addMembersToLibrary: addMembersToLibrary);
       });
@@ -134,7 +138,9 @@
                 setterDeclaration as ProcedureBuilder, typeEnvironment);
           }
         }
-      } else if (builder is SourceConstructorBuilder) {
+      }
+      // Coverage-ignore(suite): Not run.
+      else if (builder is SourceConstructorBuilder) {
         builder.checkTypes(libraryBuilder, typeEnvironment);
       } else {
         assert(false, "Unexpected member: $builder.");
@@ -311,6 +317,7 @@
     scope.forEachLocalSetter((String name, Builder setter) {
       Builder? constructor = constructorScope.lookupLocalMember(name);
       if (constructor == null || !setter.isStatic) return;
+      // Coverage-ignore-block(suite): Not run.
       addProblem(templateConflictsWithConstructor.withArguments(name),
           setter.charOffset, noLength);
       addProblem(templateConflictsWithSetter.withArguments(name),
diff --git a/pkg/front_end/lib/src/source/source_class_builder.dart b/pkg/front_end/lib/src/source/source_class_builder.dart
index 3fc6adf..b709f64 100644
--- a/pkg/front_end/lib/src/source/source_class_builder.dart
+++ b/pkg/front_end/lib/src/source/source_class_builder.dart
@@ -143,7 +143,9 @@
   }
 
   void set isConflictingAugmentationMember(bool value) {
-    assert(_isConflictingAugmentationMember == null,
+    assert(
+        _isConflictingAugmentationMember == null,
+        // Coverage-ignore(suite): Not run.
         '$this.isConflictingAugmentationMember has already been fixed.');
     _isConflictingAugmentationMember = value;
   }
@@ -187,9 +189,13 @@
     actualCls.hasConstConstructor = declaresConstConstructor;
   }
 
-  MergedClassMemberScope get mergedScope => _mergedScope ??=
-      isAugmenting ? origin.mergedScope : new MergedClassMemberScope(this);
+  MergedClassMemberScope get mergedScope => _mergedScope ??= isAugmenting
+      ?
+      // Coverage-ignore(suite): Not run.
+      origin.mergedScope
+      : new MergedClassMemberScope(this);
 
+  // Coverage-ignore(suite): Not run.
   List<SourceClassBuilder>? get augmentationsForTesting => _augmentations;
 
   SourceClassBuilder? actualOrigin;
@@ -214,6 +220,7 @@
     void buildBuilders(Builder declaration) {
       if (declaration.parent != this) {
         if (declaration.parent?.origin != origin) {
+          // Coverage-ignore-block(suite): Not run.
           if (fileUri != declaration.parent?.fileUri) {
             unexpected("$fileUri", "${declaration.parent?.fileUri}", charOffset,
                 fileUri);
@@ -256,7 +263,9 @@
     }
     if (!isMixinDeclaration &&
         actualCls.supertype != null &&
+        // Coverage-ignore(suite): Not run.
         actualCls.superclass!.isMixinDeclaration) {
+      // Coverage-ignore-block(suite): Not run.
       // Declared mixins have interfaces that can be implemented, but they
       // cannot be extended.  However, a mixin declaration with a single
       // superclass constraint is encoded with the constraint as the supertype,
@@ -390,11 +399,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterator<T> localMemberIterator<T extends Builder>() =>
       new ClassDeclarationMemberIterator<SourceClassBuilder, T>.local(this,
           includeDuplicates: false);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterator<T> localConstructorIterator<T extends MemberBuilder>() =>
       new ClassDeclarationConstructorIterator<SourceClassBuilder, T>.local(this,
           includeDuplicates: false);
@@ -406,6 +417,7 @@
           includeDuplicates: false);
 
   @override
+  // Coverage-ignore(suite): Not run.
   NameIterator<T> fullMemberNameIterator<T extends Builder>() =>
       new ClassDeclarationMemberNameIterator<SourceClassBuilder, T>(
           const _SourceClassBuilderAugmentationAccess(), this,
@@ -559,6 +571,7 @@
       int originLength = typeVariables?.length ?? 0;
       int augmentationLength = augmentation.typeVariables?.length ?? 0;
       if (originLength != augmentationLength) {
+        // Coverage-ignore-block(suite): Not run.
         augmentation.addProblem(messagePatchClassTypeVariablesMismatch,
             augmentation.charOffset, noLength, context: [
           messagePatchClassOrigin.withLocation(fileUri, charOffset, noLength)
@@ -570,6 +583,7 @@
         }
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       libraryBuilder.addProblem(messagePatchDeclarationMismatch,
           augmentation.charOffset, noLength, augmentation.fileUri, context: [
         messagePatchDeclarationOrigin.withLocation(
@@ -667,6 +681,7 @@
             !customValuesDeclaration.isStatic) {
           // Retrieve the earliest declaration for error reporting.
           while (customValuesDeclaration?.next != null) {
+            // Coverage-ignore-block(suite): Not run.
             customValuesDeclaration = customValuesDeclaration?.next;
           }
           libraryBuilder.addProblem(
@@ -682,6 +697,7 @@
             !customValuesDeclaration.isStatic) {
           // Retrieve the earliest declaration for error reporting.
           while (customValuesDeclaration?.next != null) {
+            // Coverage-ignore-block(suite): Not run.
             customValuesDeclaration = customValuesDeclaration?.next;
           }
           libraryBuilder.addProblem(
@@ -729,6 +745,7 @@
         }
       }
     }
+    // Coverage-ignore(suite): Not run.
     if (macroClass != null && !cls.isMacro && !cls.isAbstract) {
       // TODO(johnniwinther): Merge this check with the loop above.
       bool isMacroFound = false;
@@ -755,6 +772,7 @@
       int nameOffset = target.typeName.nameOffset;
       int nameLength = target.typeName.nameLength;
       if (aliasBuilder != null) {
+        // Coverage-ignore-block(suite): Not run.
         addProblem(message, nameOffset, nameLength, context: [
           messageTypedefCause.withLocation(
               aliasBuilder.fileUri, aliasBuilder.charOffset, noLength),
@@ -780,6 +798,7 @@
       // TODO(eernst): Should gather 'restricted supertype' checks in one place,
       // e.g., dynamic/int/String/Null and more are checked elsewhere.
       if (decl is VoidTypeDeclarationBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         fail(superClassType, messageExtendsVoid, aliasBuilder);
       } else if (decl is NeverTypeDeclarationBuilder) {
         fail(superClassType, messageExtendsNever, aliasBuilder);
@@ -819,7 +838,9 @@
       }
     }
     if (classHierarchyNode.isMixinApplication) {
-      assert(mixedInTypeBuilder != null,
+      assert(
+          mixedInTypeBuilder != null,
+          // Coverage-ignore(suite): Not run.
           "No mixed in type builder for mixin application $this.");
       ClassHierarchyNode mixedInNode = classHierarchyNode.mixedInNode!;
       ClassHierarchyNode? mixinSuperClassNode =
@@ -864,8 +885,11 @@
                 this.charOffset,
                 noLength);
           } else if (interface.cls.name == "FutureOr" &&
+              // Coverage-ignore(suite): Not run.
               interface.cls.enclosingLibrary.importUri.isScheme("dart") &&
+              // Coverage-ignore(suite): Not run.
               interface.cls.enclosingLibrary.importUri.path == "async") {
+            // Coverage-ignore-block(suite): Not run.
             addProblem(messageImplementsFutureOr, this.charOffset, noLength);
           } else if (implemented.contains(interface)) {
             // Aggregate repetitions.
@@ -881,6 +905,7 @@
         if (decl != superClass) {
           // TODO(eernst): Have all 'restricted supertype' checks in one place.
           if (decl is VoidTypeDeclarationBuilder) {
+            // Coverage-ignore-block(suite): Not run.
             fail(type, messageImplementsVoid, aliasBuilder);
           } else if (decl is NeverTypeDeclarationBuilder) {
             fail(type, messageImplementsNever, aliasBuilder);
@@ -966,6 +991,7 @@
               variance.keyword,
               supertype.typeName!.name);
         } else {
+          // Coverage-ignore-block(suite): Not run.
           message =
               templateInvalidTypeVariableInSupertypeWithVariance.withArguments(
                   typeVariables![i].variance.keyword,
@@ -1062,6 +1088,7 @@
     SourceLibraryBuilder library = this.libraryBuilder;
     if (!typeParameter.isLegacyCovariant &&
         !variance.greaterThanOrEqual(typeParameter.variance)) {
+      // Coverage-ignore-block(suite): Not run.
       Message message;
       if (isReturnType) {
         message = templateInvalidTypeVariableVariancePositionInReturnType
@@ -1127,6 +1154,7 @@
             required BuiltMemberKind kind}) {
           _addMemberToClass(builder, member);
           if (tearOff != null) {
+            // Coverage-ignore-block(suite): Not run.
             _addMemberToClass(builder, tearOff);
           }
         });
@@ -1150,7 +1178,9 @@
         !memberBuilder.isDuplicate &&
         !memberBuilder.isConflictingSetter) {
       if (memberBuilder.isConflictingAugmentationMember) {
-        if (member is Field && member.isStatic ||
+        if (member is Field &&
+                // Coverage-ignore(suite): Not run.
+                member.isStatic ||
             member is Procedure && member.isStatic) {
           member.name = new Name(
               '${member.name}'
@@ -1300,6 +1330,7 @@
                 memberHierarchy, interfaceMember, isSetter, callback);
           }
         } else {
+          // Coverage-ignore-block(suite): Not run.
           assert(
               false,
               "Unexpected procedure kind in override check: "
@@ -1422,6 +1453,7 @@
               .performNullabilityAwareMutualSubtypesCheck(
                   declaredBound, computedBound)
               .isSubtypeWhenUsingNullabilities()) {
+            // Coverage-ignore-block(suite): Not run.
             reportInvalidOverride(
                 isInterfaceCheck,
                 declaredMember,
@@ -1718,6 +1750,7 @@
       while (declaredNamedParameters.current.name !=
           interfaceNamedParameters.current.name) {
         if (!declaredNamedParameters.moveNext()) {
+          // Coverage-ignore-block(suite): Not run.
           reportInvalidOverride(
               isInterfaceCheck,
               declaredMember,
@@ -1753,6 +1786,7 @@
           isInterfaceCheck);
       if (declaredParameter.isRequired &&
           !interfaceNamedParameters.current.isRequired) {
+        // Coverage-ignore-block(suite): Not run.
         reportInvalidOverride(
             isInterfaceCheck,
             declaredMember,
@@ -1926,6 +1960,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Returns an iterator the origin class and all augmentations in application
   /// order.
   Iterator<SourceClassBuilder> get declarationIterator =>
@@ -1953,9 +1988,11 @@
 int? getOverlookedOverrideProblemChoice(DeclarationBuilder declarationBuilder) {
   String uri = '${declarationBuilder.libraryBuilder.importUri}';
   if (uri == 'dart:js' &&
+      // Coverage-ignore(suite): Not run.
       declarationBuilder.fileUri.pathSegments.last == 'js.dart') {
     return 0;
   } else if (uri == 'dart:_interceptors' &&
+      // Coverage-ignore(suite): Not run.
       declarationBuilder.fileUri.pathSegments.last == 'js_number.dart') {
     return 1;
   }
diff --git a/pkg/front_end/lib/src/source/source_constructor_builder.dart b/pkg/front_end/lib/src/source/source_constructor_builder.dart
index efe4a8e..cc6d37e 100644
--- a/pkg/front_end/lib/src/source/source_constructor_builder.dart
+++ b/pkg/front_end/lib/src/source/source_constructor_builder.dart
@@ -153,6 +153,7 @@
     _hasFormalsInferred = true;
   }
 
+  // Coverage-ignore(suite): Not run.
   void _inferSuperInitializingFormals(ClassHierarchyBase hierarchy) {}
 
   void _buildFormals(Member member) {
@@ -352,6 +353,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void checkVariance(
       SourceClassBuilder sourceClassBuilder, TypeEnvironment typeEnvironment) {}
 
@@ -362,10 +364,12 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get localMembers =>
       throw new UnsupportedError('${runtimeType}.localMembers');
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get localSetters =>
       throw new UnsupportedError('${runtimeType}.localSetters');
 }
@@ -449,6 +453,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Name get memberName => _memberName.name;
 
   @override
@@ -464,6 +469,7 @@
       _constructor as Member;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -473,6 +479,7 @@
   FunctionNode get function => _constructor.function;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Member> get exportedMembers => [constructor];
 
   @override
@@ -481,12 +488,14 @@
   @override
   DeclaredSourceConstructorBuilder get origin => actualOrigin ?? this;
 
+  // Coverage-ignore(suite): Not run.
   List<SourceConstructorBuilder>? get augmentationsForTesting => _augmentations;
 
   @override
   bool get isDeclarationInstanceMember => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isClassInstanceMember => false;
 
   @override
@@ -895,6 +904,7 @@
         (_augmentations ??= []).add(augmentation);
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       reportAugmentationMismatch(augmentation);
     }
   }
@@ -1015,13 +1025,16 @@
         super(constructor, constructorTearOff, parent);
 
   @override
+  // Coverage-ignore(suite): Not run.
   SourceLibraryBuilder get libraryBuilder =>
       super.libraryBuilder as SourceLibraryBuilder;
 
   @override
+  // Coverage-ignore(suite): Not run.
   DeclarationBuilder get declarationBuilder => classBuilder!;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isRedirecting {
     for (Initializer initializer in constructor.initializers) {
       if (initializer is RedirectingInitializer) {
@@ -1083,6 +1096,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void checkVariance(
       SourceClassBuilder sourceClassBuilder, TypeEnvironment typeEnvironment) {}
 
@@ -1156,6 +1170,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Name get memberName => _memberName.name;
 
   SourceExtensionTypeDeclarationBuilder get extensionTypeDeclarationBuilder =>
@@ -1165,9 +1180,12 @@
   Member get member => _constructor;
 
   @override
-  Member get readTarget => _constructorTearOff ?? _constructor;
+  Member get readTarget =>
+      _constructorTearOff ?? // Coverage-ignore(suite): Not run.
+      _constructor;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
@@ -1177,9 +1195,11 @@
   FunctionNode get function => _constructor.function;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Member> get exportedMembers => [_constructor];
 
   @override
+  // Coverage-ignore(suite): Not run.
   void addSuperParameterDefaultValueCloners(
       List<DelayedDefaultValueCloner> delayedDefaultValueCloners) {}
 
@@ -1424,16 +1444,19 @@
         ..fileOffset = node.fileOffset;
       return;
     }
+    // Coverage-ignore-block(suite): Not run.
     throw new UnsupportedError(
         "Unexpected initializer $node (${node.runtimeType})");
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitAssertInitializer(AssertInitializer node) {
     statements.add(node.statement);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitFieldInitializer(FieldInitializer node) {
     thisVariable
       ..initializer = (node.value..parent = thisVariable)
@@ -1441,6 +1464,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitInvalidInitializer(InvalidInitializer node) {
     statements.add(new ExpressionStatement(
         new InvalidExpression(null)..fileOffset = node.fileOffset)
@@ -1459,6 +1483,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitSuperInitializer(SuperInitializer node) {
     // TODO(johnniwinther): Report error for this case.
   }
diff --git a/pkg/front_end/lib/src/source/source_enum_builder.dart b/pkg/front_end/lib/src/source/source_enum_builder.dart
index ca0e03d..3fe988d 100644
--- a/pkg/front_end/lib/src/source/source_enum_builder.dart
+++ b/pkg/front_end/lib/src/source/source_enum_builder.dart
@@ -164,6 +164,7 @@
     NamedTypeBuilder objectType = new NamedTypeBuilderImpl(
         const PredefinedTypeName("Object"), const NullabilityBuilder.omitted(),
         instanceTypeVariableAccess: InstanceTypeVariableAccessState.Unexpected);
+    // Coverage-ignore(suite): Not run.
     supertypeBuilder ??= new NamedTypeBuilderImpl(
         const PredefinedTypeName("_Enum"), const NullabilityBuilder.omitted(),
         instanceTypeVariableAccess: InstanceTypeVariableAccessState.Unexpected);
@@ -256,6 +257,7 @@
           !customIndexDeclaration.isAbstract) {
         // Retrieve the earliest declaration for error reporting.
         while (customIndexDeclaration?.next != null) {
+          // Coverage-ignore-block(suite): Not run.
           customIndexDeclaration = customIndexDeclaration?.next;
         }
         libraryBuilder.addProblem(
@@ -633,6 +635,7 @@
         MemberBuilder? superConstructor = enumClass.findConstructorOrFactory(
             "", charOffset, fileUri, libraryBuilder);
         if (superConstructor == null || !superConstructor.isConstructor) {
+          // Coverage-ignore-block(suite): Not run.
           // TODO(ahe): Ideally, we would also want to check that [Object]'s
           // unnamed constructor requires no arguments. But that information
           // isn't always available at this point, and it's not really a
@@ -862,11 +865,13 @@
         ? classHierarchy.getDispatchTarget(cls.superclass!, toStringName)
         : null;
     Procedure? toStringSuperTarget = superToString is Procedure &&
+            // Coverage-ignore(suite): Not run.
             superToString.enclosingClass != classHierarchy.coreTypes.objectClass
         ? superToString
         : null;
 
     if (toStringSuperTarget != null) {
+      // Coverage-ignore-block(suite): Not run.
       toStringBuilder.member.transformerFlags |= TransformerFlag.superCalls;
       toStringBuilder.body = new ReturnStatement(new SuperMethodInvocation(
           toStringName, new Arguments([]), toStringSuperTarget));
diff --git a/pkg/front_end/lib/src/source/source_extension_builder.dart b/pkg/front_end/lib/src/source/source_extension_builder.dart
index 249b647..d1c9c51 100644
--- a/pkg/front_end/lib/src/source/source_extension_builder.dart
+++ b/pkg/front_end/lib/src/source/source_extension_builder.dart
@@ -75,13 +75,18 @@
   @override
   SourceExtensionBuilder get origin => _origin ?? this;
 
+  // Coverage-ignore(suite): Not run.
   // TODO(johnniwinther): Add merged scope for extensions.
   MergedClassMemberScope get mergedScope => _mergedScope ??= isAugmenting
       ? origin.mergedScope
       : throw new UnimplementedError("SourceExtensionBuilder.mergedScope");
 
   @override
-  Extension get extension => isAugmenting ? origin._extension : _extension;
+  Extension get extension => isAugmenting
+      ?
+      // Coverage-ignore(suite): Not run.
+      origin._extension
+      : _extension;
 
   @override
   BodyBuilderContext createBodyBuilderContext(
@@ -115,6 +120,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void addMemberInternal(SourceMemberBuilder memberBuilder,
       BuiltMemberKind memberKind, Member member, Member? tearOff) {
     unhandled("${memberBuilder.runtimeType}:${memberKind}", "addMemberInternal",
@@ -143,6 +149,7 @@
       case BuiltMemberKind.ExtensionTypeFactory:
       case BuiltMemberKind.ExtensionTypeRedirectingFactory:
       case BuiltMemberKind.ExtensionTypeRepresentationField:
+        // Coverage-ignore(suite): Not run.
         unhandled(
             "${memberBuilder.runtimeType}:${memberKind}",
             "addMemberDescriptorInternal",
@@ -176,6 +183,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void applyAugmentation(Builder augmentation) {
     if (augmentation is SourceExtensionBuilder) {
       augmentation._origin = this;
diff --git a/pkg/front_end/lib/src/source/source_extension_type_declaration_builder.dart b/pkg/front_end/lib/src/source/source_extension_type_declaration_builder.dart
index fef1f4c..7dd46db 100644
--- a/pkg/front_end/lib/src/source/source_extension_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/source/source_extension_type_declaration_builder.dart
@@ -101,6 +101,7 @@
   @override
   SourceExtensionTypeDeclarationBuilder get origin => _origin ?? this;
 
+  // Coverage-ignore(suite): Not run.
   // TODO(johnniwinther): Add merged scope for extension type declarations.
   MergedClassMemberScope get mergedScope => _mergedScope ??= isAugmenting
       ? origin.mergedScope
@@ -109,7 +110,9 @@
 
   @override
   ExtensionTypeDeclaration get extensionTypeDeclaration => isAugmenting
-      ? origin._extensionTypeDeclaration
+      ?
+      // Coverage-ignore(suite): Not run.
+      origin._extensionTypeDeclaration
       : _extensionTypeDeclaration;
 
   @override
@@ -155,6 +158,7 @@
                     templateWrongTypeParameterVarianceInSuperinterface
                         .withArguments(variable.name, interface);
               } else {
+                // Coverage-ignore-block(suite): Not run.
                 errorMessage =
                     templateInvalidTypeVariableInSupertypeWithVariance
                         .withArguments(variable.variance.keyword, variable.name,
@@ -203,6 +207,7 @@
             if (LibraryBuilder.isFunction(cls, coreLibrary) ||
                 LibraryBuilder.isRecord(cls, coreLibrary)) {
               if (aliasBuilder != null) {
+                // Coverage-ignore-block(suite): Not run.
                 errorMessage = templateSuperExtensionTypeIsIllegalAliased
                     .withArguments(typeBuilder.fullNameForErrors, interface);
                 errorContext = [
@@ -221,6 +226,7 @@
           errorMessage = templateSuperExtensionTypeIsTypeVariable
               .withArguments(typeBuilder.fullNameForErrors);
           if (aliasBuilder != null) {
+            // Coverage-ignore-block(suite): Not run.
             errorContext = [
               messageTypedefCause.withLocation(
                   aliasBuilder.fileUri, aliasBuilder.charOffset, noLength),
@@ -374,9 +380,11 @@
             case ClassBuilder():
               typeParameters = declaration.typeVariables;
             case TypeAliasBuilder():
+              // Coverage-ignore(suite): Not run.
               typeParameters = declaration.typeVariables;
             case ExtensionTypeDeclarationBuilder():
               typeParameters = declaration.typeParameters;
+            // Coverage-ignore(suite): Not run.
             case BuiltinTypeDeclarationBuilder():
             case InvalidTypeDeclarationBuilder():
             case OmittedTypeDeclarationBuilder():
@@ -596,13 +604,16 @@
       case BuiltMemberKind.ExtensionTypeSetter:
       case BuiltMemberKind.LateSetter:
       case BuiltMemberKind.ExtensionTypeOperator:
+        // Coverage-ignore(suite): Not run.
         unhandled(
             "${memberBuilder.runtimeType}:${memberKind}",
             "addMemberInternal",
             memberBuilder.charOffset,
             memberBuilder.fileUri);
       case BuiltMemberKind.ExtensionTypeRepresentationField:
-        assert(tearOff == null, "Unexpected tear-off $tearOff");
+        assert(
+            tearOff == null, // Coverage-ignore(suite): Not run.
+            "Unexpected tear-off $tearOff");
         extensionTypeDeclaration.addProcedure(member as Procedure);
     }
   }
@@ -626,6 +637,7 @@
       case BuiltMemberKind.ExtensionSetter:
       case BuiltMemberKind.ExtensionOperator:
       case BuiltMemberKind.ExtensionTypeRepresentationField:
+        // Coverage-ignore(suite): Not run.
         unhandled("${memberBuilder.runtimeType}:${memberKind}", "buildMembers",
             memberBuilder.charOffset, memberBuilder.fileUri);
       case BuiltMemberKind.ExtensionField:
@@ -666,6 +678,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void applyAugmentation(Builder augmentation) {
     if (augmentation is SourceExtensionTypeDeclarationBuilder) {
       augmentation._origin = this;
@@ -699,6 +712,7 @@
   /// builder.
   SourceExtensionTypeConstructorBuilder? lookupConstructor(Name name) {
     if (name.text == "new") {
+      // Coverage-ignore-block(suite): Not run.
       name = new Name("", name.library);
     }
 
@@ -722,6 +736,7 @@
           includeDuplicates: false);
 
   @override
+  // Coverage-ignore(suite): Not run.
   NameIterator<T> fullMemberNameIterator<T extends Builder>() =>
       new ClassDeclarationMemberNameIterator<
               SourceExtensionTypeDeclarationBuilder, T>(
@@ -746,6 +761,7 @@
           includeDuplicates: false);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isMixinDeclaration => false;
 
   @override
@@ -789,16 +805,19 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterator<T> localMemberIterator<T extends Builder>() =>
       new ClassDeclarationMemberIterator<SourceExtensionTypeDeclarationBuilder,
           T>.local(this, includeDuplicates: false);
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterator<T> localConstructorIterator<T extends MemberBuilder>() =>
       new ClassDeclarationConstructorIterator<
           SourceExtensionTypeDeclarationBuilder,
           T>.local(this, includeDuplicates: false);
 
+  // Coverage-ignore(suite): Not run.
   /// Returns an iterator the origin extension type declaration and all
   /// augmentations in application order.
   Iterator<SourceExtensionTypeDeclarationBuilder> get declarationIterator =>
diff --git a/pkg/front_end/lib/src/source/source_factory_builder.dart b/pkg/front_end/lib/src/source/source_factory_builder.dart
index 721baf5..2d9d718 100644
--- a/pkg/front_end/lib/src/source/source_factory_builder.dart
+++ b/pkg/front_end/lib/src/source/source_factory_builder.dart
@@ -113,11 +113,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Name get memberName => _memberName.name;
 
   @override
   DeclarationBuilder get declarationBuilder => super.declarationBuilder!;
 
+  // Coverage-ignore(suite): Not run.
   List<SourceFactoryBuilder>? get augmentationsForTesting => _augmentations;
 
   @override
@@ -156,12 +158,14 @@
   Member? get readTarget => origin._factoryTearOff ?? _procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
   Member? get invokeTarget => _procedure;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Member> get exportedMembers => [_procedure];
 
   @override
@@ -226,10 +230,12 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get localMembers =>
       throw new UnsupportedError('${runtimeType}.localMembers');
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get localSetters =>
       throw new UnsupportedError('${runtimeType}.localSetters');
 
@@ -250,6 +256,7 @@
         new RedirectingFactoryTarget(target, typeArguments);
     bodyInternal?.parent = function;
     if (isAugmenting) {
+      // Coverage-ignore-block(suite): Not run.
       actualOrigin!.setRedirectingFactoryBody(target, typeArguments);
     }
   }
@@ -262,6 +269,7 @@
         (_augmentations ??= []).add(augmentation);
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       reportAugmentationMismatch(augmentation);
     }
   }
@@ -282,6 +290,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void checkVariance(
       SourceClassBuilder sourceClassBuilder, TypeEnvironment typeEnvironment) {}
 
@@ -324,6 +333,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullNameForErrors {
     return "${flattenName(declarationBuilder.name, charOffset, fileUri)}"
         "${name.isEmpty ? '' : '.$name'}";
@@ -397,6 +407,7 @@
 
     // Ensure that constant factories only have constant targets/bodies.
     if (isConst && !target.isConst) {
+      // Coverage-ignore-block(suite): Not run.
       libraryBuilder.addProblem(messageConstFactoryRedirectionToNonConst,
           charOffset, noLength, fileUri);
     }
@@ -512,7 +523,9 @@
       }
       if (targetBuilder is FunctionBuilder) {
         target = targetBuilder.member;
-      } else if (targetBuilder is DillMemberBuilder) {
+      }
+      // Coverage-ignore(suite): Not run.
+      else if (targetBuilder is DillMemberBuilder) {
         target = targetBuilder.member;
       } else {
         unhandled("${targetBuilder.runtimeType}", "buildOutlineExpressions",
@@ -557,6 +570,7 @@
             ?.map(substitution.substituteType)
             .toList();
       } else {
+        // Coverage-ignore-block(suite): Not run.
         typeArguments = redirectingFactoryTarget.typeArguments;
       }
       target = redirectingFactoryTarget.target;
@@ -565,6 +579,7 @@
     if (target is Constructor ||
         target is Procedure &&
             (target.isFactory || target.isExtensionTypeMember)) {
+      // Coverage-ignore(suite): Not run.
       typeArguments ??= [];
       if (_factoryTearOff != null) {
         delayedDefaultValueCloners.add(buildRedirectingFactoryTearOffBody(
@@ -590,6 +605,7 @@
 
     SourceFactoryBuilder redirectingOrigin = origin;
     if (redirectingOrigin is RedirectingFactoryBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       redirectingOrigin.typeArguments = typeArguments;
     }
   }
@@ -599,6 +615,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void checkVariance(
       SourceClassBuilder sourceClassBuilder, TypeEnvironment typeEnvironment) {}
 
@@ -663,6 +680,7 @@
         // [typeParameter].
         if (!typeEnvironment.isSubtypeOf(typeArgument, typeParameterBound,
             SubtypeCheckMode.ignoringNullabilities)) {
+          // Coverage-ignore-block(suite): Not run.
           libraryBuilder.addProblemForRedirectingFactory(
               factory,
               templateRedirectingFactoryIncompatibleTypeArgument.withArguments(
diff --git a/pkg/front_end/lib/src/source/source_field_builder.dart b/pkg/front_end/lib/src/source/source_field_builder.dart
index c2d9e70..80be196 100644
--- a/pkg/front_end/lib/src/source/source_field_builder.dart
+++ b/pkg/front_end/lib/src/source/source_field_builder.dart
@@ -314,6 +314,7 @@
     assert(
         overriddenMembers.every((overriddenMember) =>
             overriddenMember.declarationBuilder != classBuilder),
+        // Coverage-ignore(suite): Not run.
         "Unexpected override dependencies for $this: $overriddenMembers");
     _overrideDependencies ??= {};
     _overrideDependencies!.addAll(overriddenMembers);
@@ -349,12 +350,17 @@
   /// Builds the body of this field using [initializer] as the initializer
   /// expression.
   void buildBody(CoreTypes coreTypes, Expression? initializer) {
-    assert(!hasBodyBeenBuilt, "Body has already been built for $this.");
+    assert(
+        !hasBodyBeenBuilt, // Coverage-ignore(suite): Not run.
+        "Body has already been built for $this.");
     hasBodyBeenBuilt = true;
     if (!hasInitializer &&
         initializer != null &&
+        // Coverage-ignore(suite): Not run.
         initializer is! NullLiteral &&
+        // Coverage-ignore(suite): Not run.
         !isConst &&
+        // Coverage-ignore(suite): Not run.
         !isFinal) {
       internalProblem(
           messageInternalProblemAlreadyInitialized, charOffset, fileUri);
@@ -496,6 +502,7 @@
     _constInitializerToken = null;
   }
 
+  // Coverage-ignore(suite): Not run.
   bool get hasOutlineExpressionsBuilt => _constInitializerToken == null;
 
   DartType get fieldType => _fieldEncoding.type;
@@ -842,6 +849,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? getTearOff(ClassMembersBuilder membersBuilder) {
     // Ensure field type is computed.
     getMember(membersBuilder);
@@ -971,14 +979,18 @@
   }
 
   late_lowering.IsSetEncoding get isSetEncoding {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     return _isSetEncoding ??=
         late_lowering.computeIsSetEncoding(_type!, _isSetStrategy);
   }
 
   @override
   void createBodies(CoreTypes coreTypes, Expression? initializer) {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     if (isSetEncoding == late_lowering.IsSetEncoding.useSentinel) {
       _field.initializer = new StaticInvocation(coreTypes.createSentinelMethod,
           new Arguments([], types: [_type!])..fileOffset = fileOffset)
@@ -1030,7 +1042,9 @@
   /// sound encoding of fields with type variable type of undetermined
   /// nullability.
   Expression _createFieldRead({bool needsPromotion = false}) {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     if (needsPromotion) {
       VariableDeclaration variable = new VariableDeclaration.forValue(
           _createFieldGet(_field),
@@ -1095,13 +1109,17 @@
 
   @override
   DartType get type {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     return _type!;
   }
 
   @override
   void set type(DartType value) {
-    assert(_type == null || _type is InferredType,
+    assert(
+        _type == null || _type is InferredType,
+        // Coverage-ignore(suite): Not run.
         "Type has already been computed for field $name.");
     _type = value;
     if (value is! InferredType) {
@@ -1162,6 +1180,7 @@
         ..isExtensionMember = isExtensionMember;
       isInstanceMember = false;
     } else if (isExtensionTypeMember) {
+      // Coverage-ignore-block(suite): Not run.
       _field
         ..isStatic = fieldBuilder.isStatic
         ..isExtensionTypeMember = true;
@@ -1268,7 +1287,9 @@
   @override
   Statement _createSetterBody(
       CoreTypes coreTypes, String name, VariableDeclaration parameter) {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     return late_lowering.createSetterBody(
         coreTypes, fileOffset, name, parameter, _type!,
         shouldReturnValue: false,
@@ -1284,7 +1305,9 @@
   @override
   Statement _createGetterBody(
       CoreTypes coreTypes, String name, Expression? initializer) {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     return late_lowering.createGetterBodyWithoutInitializer(
         coreTypes, fileOffset, name, type,
         createVariableRead: _createFieldRead,
@@ -1384,7 +1407,9 @@
   @override
   Statement _createGetterBody(
       CoreTypes coreTypes, String name, Expression? initializer) {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     return late_lowering.createGetterWithInitializer(
         coreTypes, fileOffset, name, _type!, initializer!,
         createVariableRead: _createFieldRead,
@@ -1451,7 +1476,9 @@
   @override
   Statement _createSetterBody(
       CoreTypes coreTypes, String name, VariableDeclaration parameter) {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     return late_lowering.createSetterBodyFinal(
         coreTypes, fileOffset, name, parameter, type,
         shouldReturnValue: false,
@@ -1503,7 +1530,9 @@
   @override
   Statement _createGetterBody(
       CoreTypes coreTypes, String name, Expression? initializer) {
-    assert(_type != null, "Type has not been computed for field $name.");
+    assert(
+        _type != null, // Coverage-ignore(suite): Not run.
+        "Type has not been computed for field $name.");
     return late_lowering.createGetterWithInitializerWithRecheck(
         coreTypes, fileOffset, name, _type!, initializer!,
         createVariableRead: _createFieldRead,
@@ -1522,6 +1551,7 @@
       null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Statement _createSetterBody(
           CoreTypes coreTypes, String name, VariableDeclaration parameter) =>
       throw new UnsupportedError(
@@ -1613,6 +1643,7 @@
   DeclarationBuilder get declarationBuilder => fieldBuilder.declarationBuilder!;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isObjectMember(ClassBuilder objectClass) {
     return declarationBuilder == objectClass;
   }
@@ -1642,6 +1673,7 @@
   Name get name => _name;
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullName {
     String suffix = isSetter ? "=" : "";
     String className = declarationBuilder.fullNameForErrors;
@@ -1667,6 +1699,7 @@
   bool get hasDeclarations => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<ClassMember> get declarations =>
       throw new UnsupportedError("$runtimeType.declarations");
 
@@ -1798,14 +1831,18 @@
 
   @override
   DartType get type {
-    assert(_type != null,
+    assert(
+        _type != null,
+        // Coverage-ignore(suite): Not run.
         "Type has not been computed for field ${_fieldBuilder.name}.");
     return _type!;
   }
 
   @override
   void set type(DartType value) {
-    assert(_type == null || _type is InferredType,
+    assert(
+        _type == null || _type is InferredType,
+        // Coverage-ignore(suite): Not run.
         "Type has already been computed for field ${_fieldBuilder.name}.");
     _type = value;
     if (value is! InferredType) {
@@ -1861,6 +1898,7 @@
         Procedure? setter = _setter;
         if (setter != null) {
           if (setter.kind == ProcedureKind.Method) {
+            // Coverage-ignore-block(suite): Not run.
             setter.function.positionalParameters[1].type = value;
           } else {
             setter.function.positionalParameters.first.type = value;
@@ -1935,6 +1973,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void setGenericCovariantImpl() {
     _setter!.function.positionalParameters.first.isCovariantByClass = true;
   }
@@ -2039,14 +2078,18 @@
 
   @override
   DartType get type {
-    assert(_type != null,
+    assert(
+        _type != null,
+        // Coverage-ignore(suite): Not run.
         "Type has not been computed for field ${_fieldBuilder.name}.");
     return _type!;
   }
 
   @override
   void set type(DartType value) {
-    assert(_type == null || _type is InferredType,
+    assert(
+        _type == null || _type is InferredType,
+        // Coverage-ignore(suite): Not run.
         "Type has already been computed for field ${_fieldBuilder.name}.");
     _type = value;
     if (value is! InferredType) {
@@ -2103,9 +2146,11 @@
   Member get readTarget => _getter;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Member? get writeTarget => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Member> get exportedMembers => [_getter];
 
   @override
@@ -2125,6 +2170,7 @@
       const <ClassMember>[];
 
   @override
+  // Coverage-ignore(suite): Not run.
   void buildImplicitDefaultValue() {
     // Not needed.
   }
diff --git a/pkg/front_end/lib/src/source/source_function_builder.dart b/pkg/front_end/lib/src/source/source_function_builder.dart
index c062695..bba40fe 100644
--- a/pkg/front_end/lib/src/source/source_function_builder.dart
+++ b/pkg/front_end/lib/src/source/source_function_builder.dart
@@ -197,6 +197,7 @@
   bool get isExternal => (modifiers & externalMask) != 0;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isAssignable => false;
 
   /// Returns `true` if this member is augmented, either by being the origin
@@ -283,6 +284,7 @@
           return formal;
         }
       }
+      // Coverage-ignore(suite): Not run.
       // If we have any formals we should find the one we're looking for.
       assert(false, "$identifier not found in $formals");
     }
@@ -309,7 +311,9 @@
     // body with null.
     TreeNode? parent = function.parent;
     if (!(newBody == null &&
+        // Coverage-ignore(suite): Not run.
         parent is Procedure &&
+        // Coverage-ignore(suite): Not run.
         parent.isForwardingSemiStub)) {
       function.body = newBody;
       newBody?.parent = function;
@@ -317,6 +321,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isNative => nativeMethodName != null;
 
   void buildFunction() {
@@ -440,6 +445,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   VariableDeclaration? getTearOffParameter(int index) => null;
 
   @override
@@ -469,6 +475,7 @@
 
   bool hasBuiltOutlineExpressions = false;
 
+  // Coverage-ignore(suite): Not run.
   bool get needsDefaultValuesBuiltAsOutlineExpressions {
     if (formals != null) {
       for (FormalParameterBuilder formal in formals!) {
@@ -544,6 +551,7 @@
           constructor.member as Constructor, arguments)
         ..isConst = true;
     } else {
+      // Coverage-ignore-block(suite): Not run.
       annotation =
           new StaticInvocation(constructor.member as Procedure, arguments)
             ..isConst = true;
@@ -554,6 +562,7 @@
   @override
   bool checkAugmentation(SourceFunctionBuilder augmentation) {
     if (!isExternal && !augmentation.libraryBuilder.isAugmentationLibrary) {
+      // Coverage-ignore-block(suite): Not run.
       augmentation.libraryBuilder.addProblem(messagePatchNonExternal,
           augmentation.charOffset, noLength, augmentation.fileUri!, context: [
         messagePatchDeclarationOrigin.withLocation(
@@ -565,6 +574,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void reportAugmentationMismatch(Builder augmentation) {
     libraryBuilder.addProblem(messagePatchDeclarationMismatch,
         augmentation.charOffset, noLength, augmentation.fileUri!, context: [
diff --git a/pkg/front_end/lib/src/source/source_library_builder.dart b/pkg/front_end/lib/src/source/source_library_builder.dart
index 583233a..745218c 100644
--- a/pkg/front_end/lib/src/source/source_library_builder.dart
+++ b/pkg/front_end/lib/src/source/source_library_builder.dart
@@ -188,7 +188,9 @@
   /// This should only be called once.
   @override
   OffsetMap get offsetMap {
-    assert(_offsetMap != null, "No OffsetMap for $this");
+    assert(
+        _offsetMap != null, // Coverage-ignore(suite): Not run.
+        "No OffsetMap for $this");
     OffsetMap map = _offsetMap!;
     _offsetMap = null;
     return map;
@@ -206,6 +208,7 @@
       TypeParameterScopeKind kind, String? name) {
     assert(
         currentTypeParameterScopeBuilder.kind == kind,
+        // Coverage-ignore(suite): Not run.
         "Unexpected declaration. "
         "Trying to end a ${currentTypeParameterScopeBuilder.kind} as a $kind.");
     assert(
@@ -216,6 +219,7 @@
                 currentTypeParameterScopeBuilder.name ==
                     UnnamedExtensionName.unnamedExtensionSentinel) ||
             identical(name, "<syntax-error>"),
+        // Coverage-ignore(suite): Not run.
         "${name} != ${currentTypeParameterScopeBuilder.name}");
     TypeParameterScopeBuilder previous = currentTypeParameterScopeBuilder;
     currentTypeParameterScopeBuilder = currentTypeParameterScopeBuilder.parent!;
@@ -248,7 +252,9 @@
 
   @override
   SourceLibraryBuilder get libraryBuilder {
-    assert(_libraryBuilder != null,
+    assert(
+        _libraryBuilder != null,
+        // Coverage-ignore(suite): Not run.
         "Library builder for $this has not been computed yet.");
     return _libraryBuilder!;
   }
@@ -282,7 +288,10 @@
   @override
   void addProblemAtAccessors(Message message) {
     if (accessProblem == null) {
-      if (accessors.isEmpty && loader.roots.contains(this.importUri)) {
+      if (accessors.isEmpty &&
+          // Coverage-ignore(suite): Not run.
+          loader.roots.contains(this.importUri)) {
+        // Coverage-ignore-block(suite): Not run.
         // This is the entry point library, and nobody access it directly. So
         // we need to report a problem.
         loader.addProblem(message, -1, 1, null);
@@ -357,20 +366,25 @@
       CompilationUnit accessor, int charOffset, int length, Uri fileUri) {
     accessors.add(new LibraryAccess(accessor, fileUri, charOffset, length));
     if (accessProblem != null) {
+      // Coverage-ignore-block(suite): Not run.
       addProblem(accessProblem!, charOffset, length, fileUri);
     }
   }
 
   @override
   OutlineBuilder createOutlineBuilder() {
-    assert(_offsetMap == null, "OffsetMap has already been set for $this");
+    assert(
+        _offsetMap == null, // Coverage-ignore(suite): Not run.
+        "OffsetMap has already been set for $this");
     return new OutlineBuilder(
         this, this, this, _offsetMap = new OffsetMap(fileUri));
   }
 
   @override
   SourceLibraryBuilder createLibrary() {
-    assert(_libraryBuilder == null,
+    assert(
+        _libraryBuilder == null,
+        // Coverage-ignore(suite): Not run.
         "Source library builder as already been created for $this.");
     _libraryBuilder = _sourceLibraryBuilder;
     return _sourceLibraryBuilder;
@@ -576,8 +590,11 @@
         // Language versions have to match. Except if (at least) one of them is
         // invalid in which case we've already gotten an error about this.
         if (parentCompilationUnit.languageVersion != part.languageVersion &&
+            // Coverage-ignore(suite): Not run.
             parentCompilationUnit.languageVersion.valid &&
+            // Coverage-ignore(suite): Not run.
             part.languageVersion.valid) {
+          // Coverage-ignore-block(suite): Not run.
           // This is an error, but the part is not removed from the list of
           // parts, so that metadata annotations can be associated with it.
           List<LocatedMessage> context = <LocatedMessage>[];
@@ -702,7 +719,8 @@
 
   @override
   void validatePart(SourceLibraryBuilder? library, Set<Uri>? usedParts) {
-    _libraryBuilder = library ?? _sourceLibraryBuilder;
+    _libraryBuilder = library ?? // Coverage-ignore(suite): Not run.
+        _sourceLibraryBuilder;
     if (library != null && _parts.isNotEmpty) {
       // If [library] is null, we have already reported a problem that this
       // part is orphaned.
@@ -720,6 +738,7 @@
     }
     _parts.clear();
     if (exporters.isNotEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       List<LocatedMessage> context = <LocatedMessage>[
         messagePartExportContext.withLocation(fileUri, -1, 1),
       ];
@@ -818,6 +837,7 @@
       addProblem(messageUnsupportedDartExt, charOffset, noLength, fileUri);
       String strippedUri = uri.substring(nativeExtensionScheme.length);
       if (strippedUri.startsWith("package")) {
+        // Coverage-ignore-block(suite): Not run.
         resolvedUri = _sourceLibraryBuilder.resolve(this.importUri, strippedUri,
             uriOffset + nativeExtensionScheme.length);
         resolvedUri = loader.target.translateUri(resolvedUri);
@@ -853,6 +873,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void addSyntheticImport(
       {required String uri,
       required String? prefix,
@@ -877,6 +898,7 @@
     bool explicitCoreImport = _sourceLibraryBuilder == loader.coreLibrary;
     for (Import import in imports) {
       if (import.importedCompilationUnit?.isPart ?? false) {
+        // Coverage-ignore-block(suite): Not run.
         addProblem(
             templatePartOfInLibrary
                 .withArguments(import.importedCompilationUnit!.fileUri),
@@ -926,6 +948,7 @@
       int charOffset,
       int uriOffset) {
     if (configurations != null) {
+      // Coverage-ignore-block(suite): Not run.
       for (Configuration config in configurations) {
         if (loader.getLibrarySupportValue(config.dottedName) ==
             config.condition) {
@@ -1070,6 +1093,7 @@
       if (typeVariablesByName != null) {
         NominalVariableBuilder? tv = typeVariablesByName[name];
         if (tv != null) {
+          // Coverage-ignore-block(suite): Not run.
           enumBuilder.addProblem(
               templateConflictsWithTypeVariable.withArguments(name),
               member.charOffset,
@@ -1419,6 +1443,7 @@
               return typeVariableNames!.contains(declaration.name);
             }
             if (declaration is StructuralVariableBuilder) {
+              // Coverage-ignore-block(suite): Not run.
               return typeVariableNames!.contains(declaration.name);
             }
 
@@ -1460,6 +1485,7 @@
               }
             }
             if (namedFields != null) {
+              // Coverage-ignore-block(suite): Not run.
               for (RecordTypeFieldBuilder fieldBuilder in namedFields) {
                 if (usesTypeVariables(fieldBuilder.type)) {
                   return true;
@@ -1702,6 +1728,7 @@
       if (typeVariablesByName != null) {
         NominalVariableBuilder? tv = typeVariablesByName[name];
         if (tv != null) {
+          // Coverage-ignore-block(suite): Not run.
           extensionBuilder.addProblem(
               templateConflictsWithTypeVariable.withArguments(name),
               member.charOffset,
@@ -1804,6 +1831,7 @@
       if (typeVariablesByName != null) {
         NominalVariableBuilder? tv = typeVariablesByName[name];
         if (tv != null) {
+          // Coverage-ignore-block(suite): Not run.
           extensionTypeDeclarationBuilder.addProblem(
               templateConflictsWithTypeVariable.withArguments(name),
               member.charOffset,
@@ -2083,7 +2111,10 @@
         isInstanceMember: false,
         libraryName: indexedLibrary != null
             ? new LibraryName(
-                (_indexedContainer ?? indexedLibrary)!.library.reference)
+                (_indexedContainer ?? // Coverage-ignore(suite): Not run.
+                        indexedLibrary)!
+                    .library
+                    .reference)
             : libraryName);
 
     Reference? constructorReference;
@@ -2098,6 +2129,7 @@
               .getConstructorMemberName(procedureName, isTearOff: true)
               .name);
     } else if (indexedLibrary != null) {
+      // Coverage-ignore-block(suite): Not run.
       constructorReference = indexedLibrary!.lookupGetterReference(
           procedureNameScheme
               .getConstructorMemberName(procedureName, isTearOff: false)
@@ -2526,7 +2558,9 @@
       bool hasSuper,
       int charOffset,
       Token? initializerToken) {
-    assert(!hasThis || !hasSuper,
+    assert(
+        !hasThis || !hasSuper,
+        // Coverage-ignore(suite): Not run.
         "Formal parameter '${name}' has both 'this' and 'super' prefixes.");
     if (hasThis) {
       modifiers |= initializingFormalMask;
@@ -2551,6 +2585,7 @@
       int charOffset,
       {required InstanceTypeVariableAccessState instanceTypeVariableAccess}) {
     if (_sourceLibraryBuilder._omittedTypeDeclarationBuilders != null) {
+      // Coverage-ignore-block(suite): Not run.
       Builder? builder =
           _sourceLibraryBuilder._omittedTypeDeclarationBuilders[typeName.name];
       if (builder is OmittedTypeDeclarationBuilder) {
@@ -2615,6 +2650,7 @@
       if (tv.isWildcard) continue;
       StructuralVariableBuilder? existing = typeVariablesByName[tv.name];
       if (existing != null) {
+        // Coverage-ignore-block(suite): Not run.
         addProblem(messageTypeVariableDuplicatedName, tv.charOffset,
             tv.name.length, fileUri,
             context: [
@@ -2626,6 +2662,7 @@
       } else {
         typeVariablesByName[tv.name] = tv;
         if (owner is ClassBuilder) {
+          // Coverage-ignore-block(suite): Not run.
           // Only classes and type variables can't have the same name. See
           // [#29555](https://github.com/dart-lang/sdk/issues/29555).
           if (tv.name == owner.name) {
@@ -2722,10 +2759,15 @@
                     tv.charOffset, tv.name.length, fileUri);
               }
             case TypeAliasBuilder():
+            // Coverage-ignore(suite): Not run.
             case NominalVariableBuilder():
+            // Coverage-ignore(suite): Not run.
             case StructuralVariableBuilder():
+            // Coverage-ignore(suite): Not run.
             case InvalidTypeDeclarationBuilder():
+            // Coverage-ignore(suite): Not run.
             case BuiltinTypeDeclarationBuilder():
+            // Coverage-ignore(suite): Not run.
             // TODO(johnniwinther): How should we handle this case?
             case OmittedTypeDeclarationBuilder():
           }
@@ -2751,8 +2793,11 @@
           bound: variable.bound
               ?.clone(newTypes, _sourceLibraryBuilder, declaration),
           kind: kind,
-          variableVariance:
-              variable.parameter.isLegacyCovariant ? null : variable.variance,
+          variableVariance: variable.parameter.isLegacyCovariant
+              ? null
+              :
+              // Coverage-ignore(suite): Not run.
+              variable.variance,
           isWildcard: variable.isWildcard);
       copy.add(newVariable);
       unboundNominalVariables.add(newVariable);
@@ -2764,6 +2809,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<MetadataBuilder>? get metadata => _sourceLibraryBuilder.metadata;
 
   @override
@@ -2862,6 +2908,7 @@
         other = declaration;
       }
       if (deferred != null) {
+        // Coverage-ignore-block(suite): Not run.
         addProblem(templateDeferredPrefixDuplicated.withArguments(name),
             deferred.charOffset, noLength, fileUri,
             context: [
@@ -2933,7 +2980,9 @@
       // alternative is to share these mixin applications. This situation can
       // happen if you have `class A extends Object with Mixin {}` and `class B
       // extends Object with Mixin {}` in the same library.
-      return !existing.isMixinApplication || !other.isMixinApplication;
+      return !existing.isMixinApplication ||
+          // Coverage-ignore(suite): Not run.
+          !other.isMixinApplication;
     }
     return true;
   }
@@ -2961,6 +3010,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void clearExtensionsInScopeCache() {
     _extensionsInScope = null;
   }
@@ -2993,6 +3043,7 @@
               unboundTypes: unboundTypes,
               unboundTypeVariables: unboundTypeVariables);
           for (NamedTypeBuilder unboundType in unboundTypes) {
+            // Coverage-ignore-block(suite): Not run.
             currentTypeParameterScopeBuilder
                 .registerUnresolvedNamedType(unboundType);
           }
@@ -3129,6 +3180,7 @@
             processSourceMemberBuilder(member,
                 inErrorRecovery: issues.isNotEmpty);
           } else {
+            // Coverage-ignore-block(suite): Not run.
             assert(false,
                 "Unexpected extension member $member (${member.runtimeType}).");
           }
@@ -3154,6 +3206,7 @@
             processSourceMemberBuilder(member,
                 inErrorRecovery: issues.isNotEmpty);
           } else {
+            // Coverage-ignore-block(suite): Not run.
             assert(
                 false,
                 "Unexpected extension type member "
@@ -3163,8 +3216,11 @@
       } else {
         assert(
             declaration is PrefixBuilder ||
+                // Coverage-ignore(suite): Not run.
                 declaration is DynamicTypeDeclarationBuilder ||
+                // Coverage-ignore(suite): Not run.
                 declaration is NeverTypeDeclarationBuilder,
+            // Coverage-ignore(suite): Not run.
             "Unexpected top level member $declaration "
             "(${declaration.runtimeType}).");
       }
@@ -3263,6 +3319,7 @@
       TypeDeclarationBuilder? declaration = bound.declaration;
       // TODO(cstefantsova): Unalias beyond the first layer for the check.
       if (declaration is TypeAliasBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         TypeBuilder? rhsType = declaration.type;
         if (rhsType is FunctionTypeBuilder &&
             rhsType.typeVariables != null &&
@@ -3327,6 +3384,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   // TODO(johnniwinther): Avoid using [_sourceLibraryBuilder.library] here.
   Uri get originImportUri => _sourceLibraryBuilder.library.importUri;
 }
@@ -3349,6 +3407,7 @@
 
   final Uri? _packageUri;
 
+  // Coverage-ignore(suite): Not run.
   Uri? get packageUriForTesting => _packageUri;
 
   @override
@@ -3399,7 +3458,11 @@
   // A library to use for Names generated when compiling code in this library.
   // This allows code generated in one library to use the private namespace of
   // another, for example during expression compilation (debugging).
-  Library get nameOrigin => _nameOrigin?.library ?? library;
+  Library get nameOrigin =>
+      _nameOrigin
+          // Coverage-ignore(suite): Not run.
+          ?.library ??
+      library;
 
   @override
   LibraryBuilder get nameOriginBuilder => _nameOrigin ?? this;
@@ -3526,11 +3589,14 @@
     assert(
         _packageUri == null ||
             !importUri.isScheme('package') ||
+            // Coverage-ignore(suite): Not run.
             importUri.path.startsWith(_packageUri.path),
+        // Coverage-ignore(suite): Not run.
         "Foreign package uri '$_packageUri' set on library with import uri "
         "'${importUri}'.");
     assert(
         !importUri.isScheme('dart') || _packageUri == null,
+        // Coverage-ignore(suite): Not run.
         "Package uri '$_packageUri' set on dart: library with import uri "
         "'${importUri}'.");
     compilationUnit =
@@ -3580,6 +3646,7 @@
       }
     } else {
       if (feature.flag.isEnabledByDefault) {
+        // Coverage-ignore-block(suite): Not run.
         if (languageVersion.version < feature.enabledVersion) {
           message =
               templateExperimentDisabledInvalidLanguageVersion.withArguments(
@@ -3657,10 +3724,12 @@
   bool get isPart => partOfName != null || partOfUri != null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterator<T> fullMemberIterator<T extends Builder>() =>
       new SourceLibraryBuilderMemberIterator<T>(this, includeDuplicates: false);
 
   @override
+  // Coverage-ignore(suite): Not run.
   NameIterator<T> fullMemberNameIterator<T extends Builder>() =>
       new SourceLibraryBuilderMemberNameIterator<T>(this,
           includeDuplicates: false);
@@ -3670,14 +3739,19 @@
       _augmentationLibraries;
 
   void addAugmentationLibrary(SourceLibraryBuilder augmentationLibrary) {
-    assert(augmentationLibrary.isAugmenting,
+    assert(
+        augmentationLibrary.isAugmenting,
+        // Coverage-ignore(suite): Not run.
         "Library ${augmentationLibrary} must be a augmentation library.");
-    assert(!augmentationLibrary.isPart,
+    assert(
+        !augmentationLibrary.isPart,
+        // Coverage-ignore(suite): Not run.
         "Augmentation library ${augmentationLibrary} cannot be a part .");
     (_augmentationLibraries ??= []).add(augmentationLibrary);
     augmentationLibrary.augmentationIndex = _augmentationLibraries!.length;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Creates a synthesized augmentation library for the [source] code and
   /// attach it as an augmentation library of this library.
   ///
@@ -3740,6 +3814,7 @@
   LanguageVersion get languageVersion {
     assert(
         _languageVersion.isFinal,
+        // Coverage-ignore(suite): Not run.
         "Attempting to read the language version of ${this} before has been "
         "finalized.");
     return _languageVersion;
@@ -3769,6 +3844,7 @@
     assert(!_languageVersion.isFinal);
 
     if (version > loader.target.currentSdkVersion) {
+      // Coverage-ignore-block(suite): Not run.
       // If trying to set a language version that is higher than the current sdk
       // version it's an error.
       addPostponedProblem(
@@ -3802,6 +3878,7 @@
   // TODO(johnniwinther): Move this to [SourceCompilationUnitImpl].
   Uri resolve(Uri baseUri, String? uri, int uriOffset, {isPart = false}) {
     if (uri == null) {
+      // Coverage-ignore-block(suite): Not run.
       addProblem(messageExpectedUri, uriOffset, noLength, fileUri);
       return new Uri(scheme: MALFORMED_URI_SCHEME);
     }
@@ -3812,12 +3889,19 @@
       // Point to position in string indicated by the exception,
       // or to the initial quote if no position is given.
       // (Assumes the directive is using a single-line string.)
-      addProblem(templateCouldNotParseUri.withArguments(uri, e.message),
-          uriOffset + 1 + (e.offset ?? -1), 1, fileUri);
+      addProblem(
+          templateCouldNotParseUri.withArguments(uri, e.message),
+          uriOffset +
+              1 +
+              (e.offset ?? // Coverage-ignore(suite): Not run.
+                  -1),
+          1,
+          fileUri);
       return new Uri(
           scheme: MALFORMED_URI_SCHEME, query: Uri.encodeQueryComponent(uri));
     }
     if (isPart && baseUri.isScheme("dart")) {
+      // Coverage-ignore-block(suite): Not run.
       // Resolve using special rules for dart: URIs
       return resolveRelativeUri(baseUri, parsedUri);
     } else {
@@ -3826,6 +3910,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Iterable<Uri> get dependencies sync* {
     yield* compilationUnit.dependencies;
     for (SourceCompilationUnit part in parts) {
@@ -3952,10 +4037,12 @@
 
     if (unserializableExports != null) {
       Name fieldName = new Name(unserializableExportName, library);
-      Reference? fieldReference =
-          indexedLibrary?.lookupFieldReference(fieldName);
-      Reference? getterReference =
-          indexedLibrary?.lookupGetterReference(fieldName);
+      Reference? fieldReference = indexedLibrary
+          // Coverage-ignore(suite): Not run.
+          ?.lookupFieldReference(fieldName);
+      Reference? getterReference = indexedLibrary
+          // Coverage-ignore(suite): Not run.
+          ?.lookupGetterReference(fieldName);
       library.addField(new Field.immutable(fieldName,
           initializer: new StringLiteral(jsonEncode(unserializableExports)),
           isStatic: true,
@@ -4017,14 +4104,20 @@
                   builder.message.problemMessage;
             case BuiltinTypeDeclarationBuilder():
               if (builder is DynamicTypeDeclarationBuilder) {
-                assert(name == 'dynamic',
+                assert(
+                    name == 'dynamic',
+                    // Coverage-ignore(suite): Not run.
                     "Unexpected export name for 'dynamic': '$name'");
                 (unserializableExports ??= {})[name] = exportDynamicSentinel;
               } else if (builder is NeverTypeDeclarationBuilder) {
-                assert(name == 'Never',
+                assert(
+                    name == 'Never',
+                    // Coverage-ignore(suite): Not run.
                     "Unexpected export name for 'Never': '$name'");
-                (unserializableExports ??= {})[name] = exportNeverSentinel;
+                (unserializableExports ??= // Coverage-ignore(suite): Not run.
+                    {})[name] = exportNeverSentinel;
               }
+            // Coverage-ignore(suite): Not run.
             // TODO(johnniwinther): How should we handle this case?
             case OmittedTypeDeclarationBuilder():
             case NominalVariableBuilder():
@@ -4257,6 +4350,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get fullNameForErrors {
     // TODO(ahe): Consider if we should use relativizeUri here. The downside to
     // doing that is that this URI may be used in an error message. Ideally, we
@@ -4284,6 +4378,7 @@
   final Uri importUri;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void becomeCoreLibrary() {
     if (scope.lookupLocalMember("dynamic", setter: false) == null) {
       addBuilder("dynamic",
@@ -4309,7 +4404,9 @@
   }
 
   void registerInferableType(InferableType inferableType) {
-    assert(_inferableTypes != null,
+    assert(
+        _inferableTypes != null,
+        // Coverage-ignore(suite): Not run.
         "Late registration of inferable type $inferableType.");
     _inferableTypes?.add(inferableType);
   }
@@ -4336,6 +4433,7 @@
   void addPostponedProblem(
       Message message, int charOffset, int length, Uri fileUri) {
     if (postponedProblemsIssued) {
+      // Coverage-ignore-block(suite): Not run.
       addProblem(message, charOffset, length, fileUri);
     } else {
       postponedProblems ??= <PostponedProblem>[];
@@ -4548,8 +4646,11 @@
       } else {
         assert(
             declaration is PrefixBuilder ||
+                // Coverage-ignore(suite): Not run.
                 declaration is DynamicTypeDeclarationBuilder ||
+                // Coverage-ignore(suite): Not run.
                 declaration is NeverTypeDeclarationBuilder,
+            // Coverage-ignore(suite): Not run.
             "Unexpected builder in library: ${declaration} "
             "(${declaration.runtimeType}");
       }
@@ -4611,6 +4712,7 @@
           required BuiltMemberKind kind}) {
         _addMemberToLibrary(declaration, member);
         if (tearOff != null) {
+          // Coverage-ignore-block(suite): Not run.
           _addMemberToLibrary(declaration, tearOff);
         }
       });
@@ -4622,7 +4724,9 @@
     } else if (declaration is PrefixBuilder) {
       // Ignored. Kernel doesn't represent prefixes.
       return;
-    } else if (declaration is BuiltinTypeDeclarationBuilder) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (declaration is BuiltinTypeDeclarationBuilder) {
       // Nothing needed.
       return;
     } else {
@@ -4636,6 +4740,7 @@
       member.isStatic = true;
       if (!declaration.isAugmenting && !declaration.isDuplicate) {
         if (declaration.isConflictingAugmentationMember) {
+          // Coverage-ignore-block(suite): Not run.
           member.name = new Name(
               '${member.name.text}'
               '#${declaration.libraryBuilder.augmentationIndex}',
@@ -4672,6 +4777,7 @@
           constructor.member as Constructor, arguments)
         ..isConst = true;
     } else {
+      // Coverage-ignore-block(suite): Not run.
       annotation =
           new StaticInvocation(constructor.member as Procedure, arguments)
             ..isConst = true;
@@ -4695,10 +4801,12 @@
     if (declaration is InvalidTypeDeclarationBuilder) return declaration;
     if (other is InvalidTypeDeclarationBuilder) return other;
     if (declaration is AccessErrorBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       AccessErrorBuilder error = declaration;
       declaration = error.builder;
     }
     if (other is AccessErrorBuilder) {
+      // Coverage-ignore-block(suite): Not run.
       AccessErrorBuilder error = other;
       other = error.builder;
     }
@@ -4724,7 +4832,11 @@
       return preferred;
     }
     if (declaration.next == null && other.next == null) {
-      if (isImport && declaration is PrefixBuilder && other is PrefixBuilder) {
+      if (isImport &&
+          declaration is PrefixBuilder &&
+          // Coverage-ignore(suite): Not run.
+          other is PrefixBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         // Handles the case where the same prefix is used for different
         // imports.
         return declaration
@@ -4872,8 +4984,11 @@
       StructuralVariableBuilder newVariable = new StructuralVariableBuilder(
           variable.name, this, variable.charOffset, variable.fileUri,
           bound: variable.bound?.clone(newTypes, this, declaration),
-          variableVariance:
-              variable.parameter.isLegacyCovariant ? null : variable.variance,
+          variableVariance: variable.parameter.isLegacyCovariant
+              ? null
+              :
+              // Coverage-ignore(suite): Not run.
+              variable.variance,
           isWildcard: variable.isWildcard);
       copy.add(newVariable);
       unboundStructuralVariables.add(newVariable);
@@ -4973,6 +5088,7 @@
       }
     }
 
+    // Coverage-ignore(suite): Not run.
     void setBoundAndDefaultType(
         /* TypeParameterType | StructuralParameterType */ type,
         DartType bound,
@@ -5005,13 +5121,17 @@
         new List<DartType?>.filled(_pendingNullabilities.length, null);
     int stackTop = 0;
     for (PendingNullability pendingNullability in _pendingNullabilities) {
-      if (typeFilter != null && !typeFilter.contains(pendingNullability.type)) {
+      if (typeFilter != null &&
+          // Coverage-ignore(suite): Not run.
+          !typeFilter.contains(pendingNullability.type)) {
         continue;
       }
       nullabilityMap[pendingNullability.type] = null;
     }
     for (PendingNullability pendingNullability in _pendingNullabilities) {
-      if (typeFilter != null && !typeFilter.contains(pendingNullability.type)) {
+      if (typeFilter != null &&
+          // Coverage-ignore(suite): Not run.
+          !typeFilter.contains(pendingNullability.type)) {
         continue;
       }
       DartType type = pendingNullability.type;
@@ -5038,6 +5158,7 @@
             if (getDeclaredNullability(next) == marker) {
               setDeclaredNullability(next, Nullability.undetermined);
               if (isDirectDependency) {
+                // Coverage-ignore-block(suite): Not run.
                 // The dependency error is reported elsewhere.
                 setBoundAndDefaultType(
                     current, const InvalidType(), const InvalidType());
@@ -5055,6 +5176,7 @@
           setDeclaredNullability(current, computeNullabilityFromBound(current));
         }
       } else if (peeledBound is StructuralParameterType) {
+        // Coverage-ignore-block(suite): Not run.
         DartType current = type;
         DartType? next = peeledBound;
         bool isDirectDependency = identical(getBound(type), peeledBound);
@@ -5142,6 +5264,7 @@
     if (!isAugmenting) return;
 
     if (languageVersion != origin.languageVersion) {
+      // Coverage-ignore-block(suite): Not run.
       List<LocatedMessage> context = <LocatedMessage>[];
       if (origin.languageVersion.isExplicit) {
         context.add(messageLanguageVersionLibraryContext.withLocation(
@@ -5191,6 +5314,7 @@
             required BuiltMemberKind kind}) {
           _addMemberToLibrary(builder, member);
           if (tearOff != null) {
+            // Coverage-ignore-block(suite): Not run.
             _addMemberToLibrary(builder, tearOff);
           }
         });
@@ -5203,12 +5327,15 @@
         count +=
             builder.buildBodyNodes(addMembersToLibrary: !builder.isDuplicate);
       } else if (builder is SourceClassBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         count += builder.buildBodyNodes();
       } else if (builder is SourceTypeAliasBuilder) {
         // Do nothing.
       } else if (builder is PrefixBuilder) {
         // Ignored. Kernel doesn't represent prefixes.
-      } else if (builder is BuiltinTypeDeclarationBuilder) {
+      }
+      // Coverage-ignore(suite): Not run.
+      else if (builder is BuiltinTypeDeclarationBuilder) {
         // Nothing needed.
       } else {
         unhandled("${builder.runtimeType}", "buildBodyNodes",
@@ -5302,6 +5429,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   void reportTypeArgumentIssue(Message message, Uri fileUri, int fileOffset,
       {TypeParameter? typeParameter,
       DartType? superBoundedAttempt,
@@ -5346,9 +5474,11 @@
               noLength));
     }
     if (superBoundedAttemptInverted != null && superBoundedAttempt != null) {
-      (context ??= <LocatedMessage>[]).add(templateSuperBoundedHint
-          .withArguments(superBoundedAttempt, superBoundedAttemptInverted)
-          .withLocation(fileUri, fileOffset, noLength));
+      (context ??= // Coverage-ignore(suite): Not run.
+              <LocatedMessage>[])
+          .add(templateSuperBoundedHint
+              .withArguments(superBoundedAttempt, superBoundedAttemptInverted)
+              .withLocation(fileUri, fileOffset, noLength));
     }
     addProblem(message, fileOffset, noLength, fileUri, context: context);
   }
@@ -5491,6 +5621,7 @@
     if (issues.isNotEmpty) {
       DartType? targetReceiver;
       if (klass != null) {
+        // Coverage-ignore-block(suite): Not run.
         targetReceiver =
             new InterfaceType(klass, klass.enclosingLibrary.nonNullable);
       }
@@ -5686,7 +5817,9 @@
       } else {
         assert(
             declaration is! TypeDeclarationBuilder ||
+                // Coverage-ignore(suite): Not run.
                 declaration is BuiltinTypeDeclarationBuilder,
+            // Coverage-ignore(suite): Not run.
             "Unexpected declaration ${declaration.runtimeType}");
       }
     }
@@ -5733,7 +5866,9 @@
                 new InvalidTypeDeclarationBuilder(
                     typeVariable.name,
                     message.withLocation(
-                        dependency.typeVariableBoundOfItself.fileUri ?? fileUri,
+                        dependency.typeVariableBoundOfItself
+                                .fileUri ?? // Coverage-ignore(suite): Not run.
+                            fileUri,
                         dependency.typeVariableBoundOfItself.charOffset,
                         dependency.typeVariableBoundOfItself.name.length)));
         }
@@ -5757,6 +5892,7 @@
     compilationUnit.forEachExtensionInScope(f);
   }
 
+  // Coverage-ignore(suite): Not run.
   void clearExtensionsInScopeCache() {
     compilationUnit.clearExtensionsInScopeCache();
   }
@@ -5864,6 +6000,7 @@
         case TypeUse.macroTypeArgument:
         case TypeUse.typeParameterDefaultType:
         case TypeUse.defaultTypeAsTypeArgument:
+        // Coverage-ignore(suite): Not run.
         case TypeUse.deferredTypeError:
           break;
       }
@@ -5919,6 +6056,7 @@
             augmentationLibraryDelayedDefaultValueCloners =
             augmentationLibrary.installTypedefTearOffs();
         if (augmentationLibraryDelayedDefaultValueCloners != null) {
+          // Coverage-ignore-block(suite): Not run.
           (delayedDefaultValueCloners ??= [])
               .addAll(augmentationLibraryDelayedDefaultValueCloners);
         }
@@ -6013,6 +6151,7 @@
         return new ClassName(name);
       case TypeParameterScopeKind.extensionDeclaration:
         return extensionName;
+      // Coverage-ignore(suite): Not run.
       case TypeParameterScopeKind.typedef:
       case TypeParameterScopeKind.staticMethod:
       case TypeParameterScopeKind.instanceMethod:
@@ -6041,6 +6180,7 @@
         return ContainerType.Extension;
       case TypeParameterScopeKind.extensionTypeDeclaration:
         return ContainerType.ExtensionType;
+      // Coverage-ignore(suite): Not run.
       case TypeParameterScopeKind.typedef:
       case TypeParameterScopeKind.staticMethod:
       case TypeParameterScopeKind.instanceMethod:
@@ -6139,7 +6279,9 @@
   /// given [name] and [typeVariables] located [charOffset].
   void markAsClassDeclaration(String name, int charOffset,
       List<NominalVariableBuilder>? typeVariables) {
-    assert(_kind == TypeParameterScopeKind.classOrNamedMixinApplication,
+    assert(
+        _kind == TypeParameterScopeKind.classOrNamedMixinApplication,
+        // Coverage-ignore(suite): Not run.
         "Unexpected declaration kind: $_kind");
     _kind = TypeParameterScopeKind.classDeclaration;
     _name = name;
@@ -6151,7 +6293,9 @@
   /// with the given [name] and [typeVariables] located [charOffset].
   void markAsNamedMixinApplication(String name, int charOffset,
       List<NominalVariableBuilder>? typeVariables) {
-    assert(_kind == TypeParameterScopeKind.classOrNamedMixinApplication,
+    assert(
+        _kind == TypeParameterScopeKind.classOrNamedMixinApplication,
+        // Coverage-ignore(suite): Not run.
         "Unexpected declaration kind: $_kind");
     _kind = TypeParameterScopeKind.namedMixinApplication;
     _name = name;
@@ -6166,7 +6310,9 @@
     // TODO(johnniwinther): Avoid using 'classOrNamedMixinApplication' for mixin
     // declaration. These are syntactically distinct so we don't need the
     // transition.
-    assert(_kind == TypeParameterScopeKind.classOrNamedMixinApplication,
+    assert(
+        _kind == TypeParameterScopeKind.classOrNamedMixinApplication,
+        // Coverage-ignore(suite): Not run.
         "Unexpected declaration kind: $_kind");
     _kind = TypeParameterScopeKind.mixinDeclaration;
     _name = name;
@@ -6178,7 +6324,9 @@
   /// the given [name] and [typeVariables] located [charOffset].
   void markAsExtensionDeclaration(String? name, int charOffset,
       List<NominalVariableBuilder>? typeVariables) {
-    assert(_kind == TypeParameterScopeKind.extensionOrExtensionTypeDeclaration,
+    assert(
+        _kind == TypeParameterScopeKind.extensionOrExtensionTypeDeclaration,
+        // Coverage-ignore(suite): Not run.
         "Unexpected declaration kind: $_kind");
     _kind = TypeParameterScopeKind.extensionDeclaration;
     _extensionName = name != null
@@ -6193,7 +6341,9 @@
   /// with the given [name] and [typeVariables] located [charOffset].
   void markAsExtensionTypeDeclaration(String name, int charOffset,
       List<NominalVariableBuilder>? typeVariables) {
-    assert(_kind == TypeParameterScopeKind.extensionOrExtensionTypeDeclaration,
+    assert(
+        _kind == TypeParameterScopeKind.extensionOrExtensionTypeDeclaration,
+        // Coverage-ignore(suite): Not run.
         "Unexpected declaration kind: $_kind");
     _kind = TypeParameterScopeKind.extensionTypeDeclaration;
     _name = name;
@@ -6205,7 +6355,9 @@
   /// the given [name] and [typeVariables] located [charOffset].
   void markAsEnumDeclaration(String name, int charOffset,
       List<NominalVariableBuilder>? typeVariables) {
-    assert(_kind == TypeParameterScopeKind.enumDeclaration,
+    assert(
+        _kind == TypeParameterScopeKind.enumDeclaration,
+        // Coverage-ignore(suite): Not run.
         "Unexpected declaration kind: $_kind");
     _name = name;
     _charOffset = charOffset;
@@ -6217,7 +6369,9 @@
   ///
   /// See [extensionThisType] for terminology.
   void registerExtensionThisType(TypeBuilder type) {
-    assert(_kind == TypeParameterScopeKind.extensionDeclaration,
+    assert(
+        _kind == TypeParameterScopeKind.extensionDeclaration,
+        // Coverage-ignore(suite): Not run.
         "DeclarationBuilder.registerExtensionThisType is not supported $_kind");
     assert(_extensionThisType == null,
         "Extension this type has already been set.");
@@ -6257,9 +6411,13 @@
   /// The 'extension this type' is the type if `this` expression in instance
   /// methods declared in extension declarations.
   TypeBuilder get extensionThisType {
-    assert(kind == TypeParameterScopeKind.extensionDeclaration,
+    assert(
+        kind == TypeParameterScopeKind.extensionDeclaration,
+        // Coverage-ignore(suite): Not run.
         "DeclarationBuilder.extensionThisType not supported on $kind.");
-    assert(_extensionThisType != null,
+    assert(
+        _extensionThisType != null,
+        // Coverage-ignore(suite): Not run.
         "DeclarationBuilder.extensionThisType has not been set on $this.");
     return _extensionThisType!;
   }
@@ -6343,6 +6501,7 @@
       String name = qualifier ?? typeName.name;
       Builder? declaration;
       if (members != null) {
+        // Coverage-ignore-block(suite): Not run.
         declaration = members![name];
       }
       if (declaration == null && map != null) {
@@ -6353,6 +6512,7 @@
         // parent declaration.
         parent!.registerUnresolvedNamedType(namedTypeBuilder);
       } else if (qualifier != null) {
+        // Coverage-ignore-block(suite): Not run.
         // Attempt to use a member or type variable as a prefix.
         int nameOffset = typeName.fullNameOffset;
         int nameLength = typeName.fullNameLength;
@@ -6376,6 +6536,7 @@
 
   Scope toScope(Scope? parent,
       {Map<String, Builder>? omittedTypeDeclarationBuilders}) {
+    // Coverage-ignore(suite): Not run.
     if (omittedTypeDeclarationBuilders != null &&
         omittedTypeDeclarationBuilders.isNotEmpty) {
       parent = new Scope(
@@ -6465,6 +6626,7 @@
 
   bool get isExplicit => true;
 
+  // Coverage-ignore(suite): Not run.
   bool get valid => true;
 
   @override
@@ -6503,6 +6665,7 @@
       this.version, this.isExplicit);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get valid => false;
 
   @override
@@ -6530,15 +6693,19 @@
   ImplicitLanguageVersion(this.version);
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get valid => true;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Uri? get fileUri => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get charOffset => -1;
 
   @override
+  // Coverage-ignore(suite): Not run.
   int get charCount => noLength;
 
   @override
@@ -6598,6 +6765,7 @@
   LibraryAccess(this.accessor, this.fileUri, this.charOffset, this.length);
 }
 
+// Coverage-ignore(suite): Not run.
 class SourceLibraryBuilderMemberIterator<T extends Builder>
     implements Iterator<T> {
   Iterator<T>? _iterator;
@@ -6647,6 +6815,7 @@
   T get current => _iterator?.current ?? (throw new StateError('No element'));
 }
 
+// Coverage-ignore(suite): Not run.
 class SourceLibraryBuilderMemberNameIterator<T extends Builder>
     implements NameIterator<T> {
   NameIterator<T>? _iterator;
diff --git a/pkg/front_end/lib/src/source/source_loader.dart b/pkg/front_end/lib/src/source/source_loader.dart
index 7bd8d3d..12b02c3 100644
--- a/pkg/front_end/lib/src/source/source_loader.dart
+++ b/pkg/front_end/lib/src/source/source_loader.dart
@@ -190,6 +190,7 @@
   /// This is used for [hasSeenError].
   bool _hasSeenError = false;
 
+  // Coverage-ignore(suite): Not run.
   /// Clears the [seenMessages] and [hasSeenError] state.
   void resetSeenMessages() {
     seenMessages.clear();
@@ -233,8 +234,11 @@
   Set<ClassBuilder> _macroDeclarations = {};
 
   SourceLoader(this.fileSystem, this.includeComments, this.target)
-      : dataForTesting =
-            retainDataForTesting ? new SourceLoaderDataForTesting() : null;
+      : dataForTesting = retainDataForTesting
+            ?
+            // Coverage-ignore(suite): Not run.
+            new SourceLoaderDataForTesting()
+            : null;
 
   bool containsLoadedLibraryBuilder(Uri importUri) =>
       lookupLoadedLibraryBuilder(importUri) != null;
@@ -246,6 +250,7 @@
   CompilationUnit? lookupCompilationUnit(Uri importUri) =>
       _compilationUnits[importUri];
 
+  // Coverage-ignore(suite): Not run.
   CompilationUnit? lookupCompilationUnitByFileUri(Uri fileUri) {
     // TODO(johnniwinther): Store compilation units in a map by file URI?
     for (CompilationUnit compilationUnit in _compilationUnits.values) {
@@ -283,11 +288,16 @@
     _sourceLibraryBuilders!.clear();
   }
 
+  // Coverage-ignore(suite): Not run.
   Iterable<Uri> get loadedLibraryImportUris => _loadedLibraryBuilders.keys;
 
   void registerLoadedDillLibraryBuilder(DillLibraryBuilder libraryBuilder) {
-    assert(!libraryBuilder.isPart, "Unexpected part $libraryBuilder.");
-    assert(!libraryBuilder.isAugmenting,
+    assert(
+        !libraryBuilder.isPart, // Coverage-ignore(suite): Not run.
+        "Unexpected part $libraryBuilder.");
+    assert(
+        !libraryBuilder.isAugmenting,
+        // Coverage-ignore(suite): Not run.
         "Unexpected augmenting library $libraryBuilder.");
     Uri uri = libraryBuilder.importUri;
     _markDartLibraries(uri, libraryBuilder, libraryBuilder.mainCompilationUnit);
@@ -295,6 +305,7 @@
     _loadedLibraryBuilders[uri] = libraryBuilder;
   }
 
+  // Coverage-ignore(suite): Not run.
   LibraryBuilder? deregisterLoadedLibraryBuilder(Uri importUri) {
     LibraryBuilder? libraryBuilder = _loadedLibraryBuilders.remove(importUri);
     if (libraryBuilder != null) {
@@ -303,6 +314,7 @@
     return libraryBuilder;
   }
 
+  // Coverage-ignore(suite): Not run.
   void clearLibraryBuilders() {
     _compilationUnits.clear();
     _loadedLibraryBuilders.clear();
@@ -398,8 +410,10 @@
     CompilationUnit? compilationUnit = lookupCompilationUnit(uri);
     // TODO(johnniwinther): Why is the dill target sometimes not loaded at this
     // point? And does it matter?
-    compilationUnit ??=
-        target.dillTarget.loader.lookupLibraryBuilder(uri)?.mainCompilationUnit;
+    compilationUnit ??= target.dillTarget.loader
+        .lookupLibraryBuilder(uri)
+        // Coverage-ignore(suite): Not run.
+        ?.mainCompilationUnit;
     return DartLibrarySupport.isDartLibrarySupported(libraryName,
             libraryExists: compilationUnit != null,
             isSynthetic: compilationUnit?.isSynthetic ?? true,
@@ -463,6 +477,7 @@
       if (packageForLanguageVersion.languageVersion != null) {
         if (packageForLanguageVersion.languageVersion
             is package_config.InvalidLanguageVersion) {
+          // Coverage-ignore-block(suite): Not run.
           packageLanguageVersionProblem =
               messageLanguageVersionInvalidInDotPackages;
           packageLanguageVersion = new InvalidLanguageVersion(
@@ -472,6 +487,7 @@
               packageForLanguageVersion.languageVersion!.major,
               packageForLanguageVersion.languageVersion!.minor);
           if (version > target.currentSdkVersion) {
+            // Coverage-ignore-block(suite): Not run.
             packageLanguageVersionProblem =
                 templateLanguageVersionTooHigh.withArguments(
                     target.currentSdkVersion.major,
@@ -518,6 +534,7 @@
 
     Uri libraryUri = origin?.importUri ?? uri;
     if (target.backendTarget.mayDefineRestrictedType(libraryUri)) {
+      // Coverage-ignore-block(suite): Not run.
       libraryBuilder.mayImplementRestrictedTypes = true;
     }
     if (uri.isScheme("dart")) {
@@ -543,6 +560,7 @@
     NonNullableByDefaultCompiledMode libraryMode =
         libraryBuilder.library.nonNullableByDefaultCompiledMode;
     if (libraryMode == NonNullableByDefaultCompiledMode.Invalid) {
+      // Coverage-ignore-block(suite): Not run.
       registerNnbdMismatchLibrary(
           libraryBuilder, messageInvalidNnbdDillLibrary);
     } else {
@@ -654,6 +672,7 @@
           firstLibrary, -1, noLength, firstLibrary.fileUri);
     }
     if (!_hasLibraryAccess(imported: uri, importer: firstLibrary?.importUri)) {
+      // Coverage-ignore-block(suite): Not run.
       if (firstLibrary != null) {
         firstLibrary.addProblem(messagePlatformPrivateLibraryAccess, -1,
             noLength, firstLibrary.importUri);
@@ -731,7 +750,9 @@
   }
 
   void logSummary(Template<SummaryTemplate> template) {
-    ticker.log((Duration elapsed, Duration sinceStart) {
+    ticker.log(
+        // Coverage-ignore(suite): Not run.
+        (Duration elapsed, Duration sinceStart) {
       int libraryCount = 0;
       for (CompilationUnit library in compilationUnits) {
         if (library.loader == this) {
@@ -803,14 +824,18 @@
     target.context.report(
         fileUri != null
             ? message.withLocation(fileUri, charOffset, length)
-            : message.withoutLocation(),
+            :
+            // Coverage-ignore(suite): Not run.
+            message.withoutLocation(),
         severity,
         context: context,
         involvedFiles: involvedFiles);
     if (severity == Severity.error) {
       (wasHandled ? handledErrors : unhandledErrors).add(fileUri != null
           ? message.withLocation(fileUri, charOffset, length)
-          : message.withoutLocation());
+          :
+          // Coverage-ignore(suite): Not run.
+          message.withoutLocation());
     }
     FormattedMessage formattedMessage = target.createFormattedMessage(
         message, charOffset, length, fileUri, context, severity,
@@ -877,7 +902,9 @@
 
   Future<Token> tokenize(SourceCompilationUnit compilationUnit,
       {bool suppressLexicalErrors = false}) async {
-    target.benchmarker?.beginSubdivide(BenchmarkSubdivides.tokenize);
+    target.benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.beginSubdivide(BenchmarkSubdivides.tokenize);
     Uri fileUri = compilationUnit.fileUri;
 
     // Lookup the file URI in the cache.
@@ -896,6 +923,7 @@
         }
         bytes = synthesizeSourceForMissingFile(importUri, null);
       } else if (!fileUri.hasScheme) {
+        // Coverage-ignore-block(suite): Not run.
         target.benchmarker?.endSubdivide();
         return internalProblem(
             templateInternalProblemUriMissingScheme.withArguments(fileUri),
@@ -1004,7 +1032,9 @@
       }
       token = token.next!;
     }
-    target.benchmarker?.endSubdivide();
+    target.benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.endSubdivide();
     return token;
   }
 
@@ -1039,6 +1069,7 @@
     _typeInferenceEngine!.typeDependencies[member] = typeDependency;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Registers the [compilationUnit] as unparsed with the given [source] code.
   ///
   /// This is used for creating synthesized augmentation libraries.
@@ -1108,6 +1139,7 @@
         }
         // We only include the [context] on the first library access.
         if (compilationUnit.accessors.isEmpty) {
+          // Coverage-ignore-block(suite): Not run.
           // This is the entry point library, and nobody access it directly. So
           // we need to report a problem.
           addProblem(message, -1, 1, null, context: context);
@@ -1145,6 +1177,7 @@
       return new Uint8List.view(
           bytes.buffer, bytes.offsetInBytes, bytes.length - 1);
     }
+    // Coverage-ignore(suite): Not run.
     return bytes.sublist(0, bytes.length - 1);
   }
 
@@ -1184,6 +1217,7 @@
       // the "real" parsing is done. This in turn means that some errors
       // (e.g. missing semi-colon) will not be issued when benchmarking.
       {
+        // Coverage-ignore-block(suite): Not run.
         target.benchmarker?.beginSubdivide(
             BenchmarkSubdivides.body_buildBody_benchmark_specific_diet_parser);
         DietParser parser = new DietParser(new ForwardingListener(),
@@ -1192,6 +1226,7 @@
         target.benchmarker?.endSubdivide();
       }
       {
+        // Coverage-ignore-block(suite): Not run.
         target.benchmarker?.beginSubdivide(
             BenchmarkSubdivides.body_buildBody_benchmark_specific_parser);
         Parser parser = new Parser(new ForwardingListener(),
@@ -1217,6 +1252,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   Future<Expression> buildExpression(
       SourceLibraryBuilder libraryBuilder,
       String? enclosingClassOrExtension,
@@ -1354,6 +1390,7 @@
           roots.add(part.partOfLibrary!.importUri);
         }
       } else {
+        // Coverage-ignore-block(suite): Not run.
         part.addProblem(messagePartOrphan, 0, 1, part.fileUri);
         SourceLibraryBuilder sourceLibraryBuilder = part.createLibrary();
         part.validatePart(null, null);
@@ -1370,8 +1407,11 @@
     }
     _sourceLibraryBuilders = sourceLibraries;
     assert(
-        _compilationUnits.values.every((library) =>
-            !(library is SourceLibraryBuilder && library.isAugmenting)),
+        _compilationUnits.values
+            .every((library) => !(library is SourceLibraryBuilder &&
+                // Coverage-ignore(suite): Not run.
+                library.isAugmenting)),
+        // Coverage-ignore(suite): Not run.
         "Augmentation library found in libraryBuilders: " +
             _compilationUnits.values
                 .where((compilationUnit) =>
@@ -1381,12 +1421,14 @@
             ".");
     assert(
         sourceLibraries.every((library) => !library.isAugmenting),
+        // Coverage-ignore(suite): Not run.
         "Augmentation library found in sourceLibraryBuilders: "
         "${sourceLibraries.where((library) => library.isAugmenting)}.");
     assert(
         _compilationUnits.values.every((compilationUnit) =>
             compilationUnit.loader != this ||
             sourceLibraries.contains(compilationUnit.libraryBuilder)),
+        // Coverage-ignore(suite): Not run.
         "Source library not found in sourceLibraryBuilders:" +
             _compilationUnits.values
                 .where((compilationUnit) =>
@@ -1483,6 +1525,7 @@
       }
     }
 
+    // Coverage-ignore-block(suite): Not run.
     Builder? macroClassBuilder =
         macroLibraryBuilder.lookupLocalMember(macroClassName);
     if (macroClassBuilder is! ClassBuilder) {
@@ -1665,13 +1708,16 @@
     return null;
   }
 
-  Class? get macroClass => _macroClassBuilder?.cls;
+  Class? get macroClass => _macroClassBuilder
+      // Coverage-ignore(suite): Not run.
+      ?.cls;
 
   Future<MacroApplications?> computeMacroApplications() async {
     if (_macroClassBuilder == null) {
       return null;
     }
 
+    // Coverage-ignore-block(suite): Not run.
     MacroApplications macroApplications = new MacroApplications(
         this,
         target.context.options.macroExecutor,
@@ -1688,6 +1734,7 @@
     return null;
   }
 
+  // Coverage-ignore(suite): Not run.
   Future<void> computeAdditionalMacroApplications(
       MacroApplications macroApplications,
       Iterable<SourceLibraryBuilder> sourceLibraryBuilders) async {
@@ -1820,7 +1867,9 @@
   /// found.
   void checkObjectClassHierarchy(ClassBuilder objectClass) {
     if (objectClass is SourceClassBuilder &&
+        // Coverage-ignore(suite): Not run.
         objectClass.libraryBuilder.loader == this) {
+      // Coverage-ignore-block(suite): Not run.
       if (objectClass.supertypeBuilder != null) {
         objectClass.supertypeBuilder = null;
         objectClass.addProblem(
@@ -1983,6 +2032,7 @@
 
   bool checkEnumSupertypeIsDenylisted(SourceClassBuilder cls) {
     if (!cls.libraryBuilder.libraryFeatures.enhancedEnums.isEnabled) {
+      // Coverage-ignore-block(suite): Not run.
       cls.addProblem(
           templateEnumSupertypeOfNonAbstractClass.withArguments(cls.name),
           cls.charOffset,
@@ -2003,6 +2053,7 @@
     for (int i = 0; i < directSupertypes.length; i++) {
       TypeDeclarationBuilder? supertype = directSupertypes[i];
       if (supertype is SourceEnumBuilder) {
+        // Coverage-ignore-block(suite): Not run.
         cls.addProblem(templateExtendingEnum.withArguments(supertype.name),
             cls.charOffset, noLength);
       } else if (!cls.libraryBuilder.mayImplementRestrictedTypes &&
@@ -2488,7 +2539,9 @@
     Set<Library> libraries = new Set<Library>();
     List<Library> workList = <Library>[];
     for (LibraryBuilder libraryBuilder in loadedLibraryBuilders) {
-      assert(!libraryBuilder.isAugmenting,
+      assert(
+          !libraryBuilder.isAugmenting,
+          // Coverage-ignore(suite): Not run.
           "Unexpected augmentation library $libraryBuilder.");
       if ((libraryBuilder.loader == this ||
           libraryBuilder.importUri.isScheme("dart") ||
@@ -2571,8 +2624,15 @@
       Class underscoreEnumClass) {
     for (SourceClassBuilder builder in sourceClasses) {
       assert(builder.libraryBuilder.loader == this && !builder.isAugmenting);
-      builder.checkSupertypes(coreTypes, hierarchyBuilder, objectClass,
-          enumClass, underscoreEnumClass, _macroClassBuilder?.cls);
+      builder.checkSupertypes(
+          coreTypes,
+          hierarchyBuilder,
+          objectClass,
+          enumClass,
+          underscoreEnumClass,
+          _macroClassBuilder
+              // Coverage-ignore(suite): Not run.
+              ?.cls);
     }
     for (SourceExtensionTypeDeclarationBuilder builder
         in sourceExtensionTypeDeclarations) {
@@ -2659,6 +2719,7 @@
           // TODO(johnniwinther): Should the member be added to the extension
           //  type declaration?
           break;
+        // Coverage-ignore(suite): Not run.
         case ExtensionBuilder():
           throw new UnsupportedError(
               "Unexpected declaration ${declarationBuilder}.");
@@ -2775,12 +2836,15 @@
     }
 
     target.benchmarker
+        // Coverage-ignore(suite): Not run.
         ?.beginSubdivide(BenchmarkSubdivides.delayedActionPerformer);
     for (DelayedActionPerformer delayedActionPerformer
         in delayedActionPerformers) {
       delayedActionPerformer.performDelayedActions(allowFurtherDelays: false);
     }
-    target.benchmarker?.endSubdivide();
+    target.benchmarker
+        // Coverage-ignore(suite): Not run.
+        ?.endSubdivide();
     ticker.logMs("Build outline expressions");
   }
 
@@ -2989,6 +3053,7 @@
     LibraryBuilder? library =
         lookupLoadedLibraryBuilder(kernelLibrary.importUri);
     if (library == null) {
+      // Coverage-ignore-block(suite): Not run.
       return target.dillTarget.loader
           .computeExtensionTypeBuilderFromTargetExtensionType(extensionType);
     }
@@ -3255,6 +3320,7 @@
 }
 """;
 
+// Coverage-ignore(suite): Not run.
 class SourceLoaderDataForTesting {
   final Map<TreeNode, TreeNode> _aliasMap = {};
 
diff --git a/pkg/front_end/lib/src/source/source_member_builder.dart b/pkg/front_end/lib/src/source/source_member_builder.dart
index 6279e48..35ce7d3 100644
--- a/pkg/front_end/lib/src/source/source_member_builder.dart
+++ b/pkg/front_end/lib/src/source/source_member_builder.dart
@@ -75,6 +75,7 @@
       retainDataForTesting ? new MemberDataForTesting() : null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void buildOutlineNodes(BuildNodesCallback f) {
     assert(false, "Unexpected call to $runtimeType.buildMembers.");
   }
@@ -85,12 +86,14 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isAugmentation => false;
 
   @override
   bool get isConflictingAugmentationMember => false;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void set isConflictingAugmentationMember(bool value) {
     assert(false,
         "Unexpected call to $runtimeType.isConflictingAugmentationMember=");
@@ -116,8 +119,11 @@
   MemberDataForTesting? dataForTesting;
 
   SourceMemberBuilderImpl(Builder parent, int charOffset, [Uri? fileUri])
-      : dataForTesting =
-            retainDataForTesting ? new MemberDataForTesting() : null,
+      : dataForTesting = retainDataForTesting
+            ?
+            // Coverage-ignore(suite): Not run.
+            new MemberDataForTesting()
+            : null,
         super(parent, charOffset, fileUri);
 
   @override
@@ -135,7 +141,9 @@
   }
 
   void set isConflictingSetter(bool value) {
-    assert(_isConflictingSetter == null,
+    assert(
+        _isConflictingSetter == null,
+        // Coverage-ignore(suite): Not run.
         '$this.isConflictingSetter has already been fixed.');
     _isConflictingSetter = value;
   }
@@ -149,22 +157,27 @@
 
   @override
   void set isConflictingAugmentationMember(bool value) {
-    assert(_isConflictingAugmentationMember == null,
+    assert(
+        _isConflictingAugmentationMember == null,
+        // Coverage-ignore(suite): Not run.
         '$this.isConflictingAugmentationMember has already been fixed.');
     _isConflictingAugmentationMember = value;
   }
 
   // TODO(johnniwinther): Remove this and create a [ProcedureBuilder] interface.
   @override
+  // Coverage-ignore(suite): Not run.
   ProcedureKind? get kind => unsupported("kind", charOffset, fileUri);
 
   @override
+  // Coverage-ignore(suite): Not run.
   void buildOutlineExpressions(
       ClassHierarchy classHierarchy,
       List<DelayedActionPerformer> delayedActionPerformers,
       List<DelayedDefaultValueCloner> delayedDefaultValueCloners) {}
 
   @override
+  // Coverage-ignore(suite): Not run.
   StringBuffer printOn(StringBuffer buffer) {
     if (isClassMember) {
       buffer.write(classBuilder!.name);
diff --git a/pkg/front_end/lib/src/source/source_procedure_builder.dart b/pkg/front_end/lib/src/source/source_procedure_builder.dart
index d7a4ba1..6058bb0 100644
--- a/pkg/front_end/lib/src/source/source_procedure_builder.dart
+++ b/pkg/front_end/lib/src/source/source_procedure_builder.dart
@@ -135,6 +135,7 @@
   @override
   Name get memberName => _memberName.name;
 
+  // Coverage-ignore(suite): Not run.
   List<SourceProcedureBuilder>? get augmentationsForTesting => _augmentations;
 
   @override
@@ -185,6 +186,7 @@
     assert(
         overriddenMembers.every((overriddenMember) =>
             overriddenMember.declarationBuilder != classBuilder),
+        // Coverage-ignore(suite): Not run.
         "Unexpected override dependencies for $this: $overriddenMembers");
     _overrideDependencies ??= {};
     _overrideDependencies!.addAll(overriddenMembers);
@@ -221,6 +223,7 @@
       case ProcedureKind.Getter:
         return procedure;
       case ProcedureKind.Factory:
+        // Coverage-ignore(suite): Not run.
         return procedure;
       case ProcedureKind.Operator:
       case ProcedureKind.Setter:
@@ -233,6 +236,7 @@
     switch (kind) {
       case ProcedureKind.Setter:
         return procedure;
+      // Coverage-ignore(suite): Not run.
       case ProcedureKind.Method:
       case ProcedureKind.Getter:
       case ProcedureKind.Operator:
@@ -280,6 +284,7 @@
           assert(extensionTearOff == null, "Unexpected extension tear-off.");
           f(member: _procedure, kind: BuiltMemberKind.ExtensionOperator);
           break;
+        // Coverage-ignore(suite): Not run.
         case ProcedureKind.Factory:
           throw new UnsupportedError(
               'Unexpected extension method kind ${kind}');
@@ -304,6 +309,7 @@
           assert(extensionTearOff == null, "Unexpected extension tear-off.");
           f(member: _procedure, kind: BuiltMemberKind.ExtensionTypeOperator);
           break;
+        // Coverage-ignore(suite): Not run.
         case ProcedureKind.Factory:
           f(
               member: _procedure,
@@ -366,7 +372,8 @@
   void _buildExtensionTearOff(SourceLibraryBuilder sourceLibraryBuilder,
       SourceDeclarationBuilderMixin declarationBuilder) {
     assert(
-        _extensionTearOff != null, "No extension tear off created for $this.");
+        _extensionTearOff != null, // Coverage-ignore(suite): Not run.
+        "No extension tear off created for $this.");
 
     _extensionTearOffParameterMap = {};
 
@@ -531,6 +538,7 @@
         (_augmentations ??= []).add(augmentation);
       }
     } else {
+      // Coverage-ignore-block(suite): Not run.
       reportAugmentationMismatch(augmentation);
     }
   }
@@ -543,6 +551,7 @@
     Procedure declaredProcedure = targetBuilder.actualProcedure;
 
     if (declaredProcedure.isAbstract || declaredProcedure.isExternal) {
+      // Coverage-ignore-block(suite): Not run.
       return targetBuilder._augmentedBuilder != null
           ? _getAugmentSuperTarget(targetBuilder._augmentedBuilder!)
           : null;
diff --git a/pkg/front_end/lib/src/source/source_type_alias_builder.dart b/pkg/front_end/lib/src/source/source_type_alias_builder.dart
index cc5cf50..cc5c617 100644
--- a/pkg/front_end/lib/src/source/source_type_alias_builder.dart
+++ b/pkg/front_end/lib/src/source/source_type_alias_builder.dart
@@ -174,8 +174,10 @@
               typeParameters = declaration.typeVariables;
             case TypeAliasBuilder():
               typeParameters = declaration.typeVariables;
+            // Coverage-ignore(suite): Not run.
             case ExtensionTypeDeclarationBuilder():
               typeParameters = declaration.typeParameters;
+            // Coverage-ignore(suite): Not run.
             case BuiltinTypeDeclarationBuilder():
             case InvalidTypeDeclarationBuilder():
             case OmittedTypeDeclarationBuilder():
@@ -500,6 +502,7 @@
       case ExtensionBuilder():
       case InvalidTypeDeclarationBuilder():
       case BuiltinTypeDeclarationBuilder():
+      // Coverage-ignore(suite): Not run.
       // TODO(johnniwinther): How should we handle this case?
       case OmittedTypeDeclarationBuilder():
       case null:
diff --git a/pkg/front_end/lib/src/source/stack_listener_impl.dart b/pkg/front_end/lib/src/source/stack_listener_impl.dart
index 681b481..4efd455 100644
--- a/pkg/front_end/lib/src/source/stack_listener_impl.dart
+++ b/pkg/front_end/lib/src/source/stack_listener_impl.dart
@@ -40,10 +40,12 @@
 
   /// Used to report an internal error encountered in the stack listener.
   @override
+  // Coverage-ignore(suite): Not run.
   Never internalProblem(Message message, int charOffset, Uri uri) {
     return problems.internalProblem(message, charOffset, uri);
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Used to report an unexpected situation encountered in the stack
   /// listener.
   Never unhandled(String what, String where, int charOffset, Uri? uri) {
diff --git a/pkg/front_end/lib/src/type_inference/closure_context.dart b/pkg/front_end/lib/src/type_inference/closure_context.dart
index 53bcae2..a4d1bfa 100644
--- a/pkg/front_end/lib/src/type_inference/closure_context.dart
+++ b/pkg/front_end/lib/src/type_inference/closure_context.dart
@@ -119,6 +119,7 @@
   final InferenceVisitorBase inferrer;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isAsync => false;
 
   /// The typing expectation for the subexpression of a `return` statement
@@ -129,6 +130,7 @@
   DartType get returnContext => _returnContext;
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get yieldContext => const UnknownType();
 
   @override
@@ -200,6 +202,7 @@
           ..parent = statement;
       } else if (!(returnType is VoidType || returnType is DynamicType) &&
           expressionType is VoidType) {
+        // Coverage-ignore-block(suite): Not run.
         // It is a compile-time error if s is `return e;`, T is neither void
         // nor dynamic, and S is void.
         statement.expression = inferrer.helper.wrapInProblem(
@@ -249,6 +252,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleYield(
       YieldStatement node, ExpressionInferenceResult expressionResult) {
     node.expression = expressionResult.expression..parent = node;
@@ -343,6 +347,7 @@
       if (resultStatement is Block) {
         resultStatement.statements.add(returnStatement);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         resultStatement =
             new Block(<Statement>[resultStatement, returnStatement])
               ..fileOffset = fileOffset;
@@ -359,6 +364,7 @@
   final InferenceVisitorBase inferrer;
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool get isAsync => true;
 
   /// The typing expectation for the subexpression of a `return` statement
@@ -372,6 +378,7 @@
   DartType get returnContext => _returnContext;
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get yieldContext => const UnknownType();
 
   @override
@@ -442,8 +449,11 @@
           inferrer.typeSchemaEnvironment.flatten(expressionType);
       if (emittedValueType is VoidType &&
           !(flattenedExpressionType is VoidType ||
+              // Coverage-ignore(suite): Not run.
               flattenedExpressionType is DynamicType ||
+              // Coverage-ignore(suite): Not run.
               flattenedExpressionType is NullType)) {
+        // Coverage-ignore-block(suite): Not run.
         // It is a compile-time error if s is `return e;`, T_v is void, and
         // flatten(S) is neither void, dynamic, Null.
         statement.expression = inferrer.helper.wrapInProblem(
@@ -456,6 +466,7 @@
       } else if (!(emittedValueType is VoidType ||
               emittedValueType is DynamicType) &&
           flattenedExpressionType is VoidType) {
+        // Coverage-ignore-block(suite): Not run.
         // It is a compile-time error if s is `return e;`, T_v is neither void
         // nor dynamic, and flatten(S) is void.
         statement.expression = inferrer.helper.wrapInProblem(
@@ -515,6 +526,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleYield(
       YieldStatement node, ExpressionInferenceResult expressionResult) {
     node.expression = expressionResult.expression..parent = node;
@@ -610,6 +622,7 @@
       if (resultStatement is Block) {
         resultStatement.statements.add(returnStatement);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         resultStatement =
             new Block(<Statement>[resultStatement, returnStatement])
               ..fileOffset = fileOffset;
@@ -641,6 +654,7 @@
   final DartType _yieldElementContext;
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get returnContext => const UnknownType();
 
   @override
@@ -671,6 +685,7 @@
   /// Updates the inferred return type based on the presence of a return
   /// statement returning the given [type].
   @override
+  // Coverage-ignore(suite): Not run.
   void handleReturn(ReturnStatement statement, DartType type, bool isArrow) {}
 
   @override
@@ -716,7 +731,9 @@
               .getStandardUpperBound(inferredElementType, type);
         }
       }
-    } else if (hasImplicitReturn) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (hasImplicitReturn) {
       // No explicit returns we have an implicit `return null`.
       inferredElementType = const NullType();
     } else {
@@ -730,6 +747,7 @@
 
     if (!inferrer.typeSchemaEnvironment.isSubtypeOf(inferredType,
         _yieldElementContext, SubtypeCheckMode.withNullabilities)) {
+      // Coverage-ignore-block(suite): Not run.
       // If the inferred return type isn't a subtype of the context, we use the
       // context.
       inferredType = inferrer.computeGreatestClosure2(_declaredReturnType);
@@ -774,6 +792,7 @@
   final DartType _yieldElementContext;
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get returnContext => const UnknownType();
 
   @override
@@ -804,6 +823,7 @@
   /// Updates the inferred return type based on the presence of a return
   /// statement returning the given [type].
   @override
+  // Coverage-ignore(suite): Not run.
   void handleReturn(ReturnStatement statement, DartType type, bool isArrow) {}
 
   @override
@@ -849,7 +869,9 @@
               .getStandardUpperBound(inferredElementType, elementType);
         }
       }
-    } else if (hasImplicitReturn) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (hasImplicitReturn) {
       // No explicit returns we have an implicit `return null`.
       inferredElementType = const NullType();
     } else {
diff --git a/pkg/front_end/lib/src/type_inference/delayed_expressions.dart b/pkg/front_end/lib/src/type_inference/delayed_expressions.dart
index ab6f8de..e05e4dc 100644
--- a/pkg/front_end/lib/src/type_inference/delayed_expressions.dart
+++ b/pkg/front_end/lib/src/type_inference/delayed_expressions.dart
@@ -170,6 +170,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) =>
       typeEnvironment.coreTypes.boolNonNullableRawType;
 
@@ -195,6 +196,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) =>
       typeEnvironment.coreTypes.intNonNullableRawType;
 
@@ -202,6 +204,7 @@
   void registerUse() {}
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) => identical(this, expression);
 }
 
@@ -225,6 +228,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) =>
       typeEnvironment.coreTypes.boolNonNullableRawType;
 
@@ -238,6 +242,7 @@
   bool uses(DelayedExpression expression) =>
       identical(this, expression) ||
       _left.uses(expression) ||
+      // Coverage-ignore(suite): Not run.
       _right.uses(expression);
 
   @override
@@ -376,6 +381,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) =>
       typeEnvironment.coreTypes.boolNonNullableRawType;
 
@@ -386,6 +392,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) ||
       _left.uses(expression) ||
@@ -414,6 +421,7 @@
       {List<Expression>? effects, required bool inCacheInitializer}) {
     DelayedExpression? lateEffect = _lateEffect;
     if (lateEffect != null) {
+      // Coverage-ignore-block(suite): Not run.
       if (effects != null) {
         effects.add(lateEffect.createExpression(typeEnvironment,
             effects: effects, inCacheInitializer: inCacheInitializer));
@@ -436,6 +444,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) {
     return _result.getType(typeEnvironment);
   }
@@ -444,14 +453,18 @@
   void registerUse() {
     _effect.registerUse();
     _result.registerUse();
-    _lateEffect?.registerUse();
+    _lateEffect
+        // Coverage-ignore(suite): Not run.
+        ?.registerUse();
   }
 
   @override
   bool uses(DelayedExpression expression) =>
       identical(this, expression) ||
       _effect.uses(expression) ||
+      // Coverage-ignore(suite): Not run.
       _result.uses(expression) ||
+      // Coverage-ignore(suite): Not run.
       (_lateEffect != null && _lateEffect.uses(expression));
 
   @override
@@ -464,6 +477,7 @@
     _effect.createStatements(typeEnvironment, results, effects: effects);
     _result.createStatements(typeEnvironment, results, effects: effects);
     if (_lateEffect != null) {
+      // Coverage-ignore-block(suite): Not run.
       if (effects != null) {
         _lateEffect.createStatements(typeEnvironment, effects);
       } else {
@@ -484,6 +498,7 @@
       createStatements(typeEnvironment, results, effects: statementEffects);
       return null;
     } else {
+      // Coverage-ignore-block(suite): Not run.
       return createExpression(typeEnvironment,
           inCacheInitializer: false, effects: expressionEffects);
     }
@@ -510,6 +525,7 @@
   Expression createExpression(TypeEnvironment typeEnvironment,
       {List<Expression>? effects, required bool inCacheInitializer}) {
     if (effects != null && hasEffect) {
+      // Coverage-ignore-block(suite): Not run.
       VariableDeclaration tempVariable =
           _cache.createTemporaryVariable(_type, fileOffset: fileOffset);
       effects.add(createVariableSet(_target, createVariableGet(tempVariable),
@@ -563,6 +579,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) {
     return typeEnvironment.coreTypes.boolNonNullableRawType;
   }
@@ -603,6 +620,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) {
     return typeEnvironment.coreTypes.boolNonNullableRawType;
   }
@@ -638,6 +656,7 @@
     Expression operand = _operand.createExpression(typeEnvironment,
         effects: effects, inCacheInitializer: inCacheInitializer);
     if (isCovarianceCheck) {
+      // Coverage-ignore-block(suite): Not run.
       return createAsExpression(operand, _type,
           forNonNullableByDefault: true,
           isCovarianceCheck: true,
@@ -666,6 +685,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) || _operand.uses(expression);
 }
@@ -697,6 +717,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) || _operand.uses(expression);
 }
@@ -718,6 +739,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) {
     return typeEnvironment.coreTypes.boolNonNullableRawType;
   }
@@ -728,6 +750,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) || _operand.uses(expression);
 }
@@ -787,6 +810,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) || _receiver.uses(expression);
 }
@@ -827,6 +851,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) || _receiver.uses(expression);
 }
@@ -861,6 +886,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) || _receiver.uses(expression);
 }
@@ -911,6 +937,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) {
     if (identical(this, expression)) return true;
     if (_receiver.uses(expression)) return true;
@@ -957,6 +984,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) || _receiver.uses(expression);
 }
@@ -977,6 +1005,7 @@
                     .where((element) => element.name == _name)
                     .length ==
                 1,
+            // Coverage-ignore(suite): Not run.
             "Invalid record type $_recordType for named access of '$_name'.");
 
   @override
@@ -1003,6 +1032,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) || _receiver.uses(expression);
 }
@@ -1053,6 +1083,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) {
     if (identical(this, expression)) return true;
     if (_receiver.uses(expression)) return true;
@@ -1108,6 +1139,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) {
     if (identical(this, expression)) return true;
     for (DelayedExpression argument in _arguments) {
@@ -1157,6 +1189,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) =>
       identical(this, expression) ||
       _left.uses(expression) ||
@@ -1177,6 +1210,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getType(TypeEnvironment typeEnvironment) {
     return typeEnvironment.coreTypes.boolNonNullableRawType;
   }
@@ -1187,6 +1221,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool uses(DelayedExpression expression) {
     return identical(this, expression) || _expression.uses(expression);
   }
diff --git a/pkg/front_end/lib/src/type_inference/external_ast_helper.dart b/pkg/front_end/lib/src/type_inference/external_ast_helper.dart
index 25bd7d8..91bfa91 100644
--- a/pkg/front_end/lib/src/type_inference/external_ast_helper.dart
+++ b/pkg/front_end/lib/src/type_inference/external_ast_helper.dart
@@ -137,7 +137,9 @@
         arguments: createArguments([value], fileOffset: fileOffset),
         fileOffset: fileOffset);
   } else {
-    assert(allowFinalAssignment || variable.isAssignable,
+    assert(
+        allowFinalAssignment || variable.isAssignable,
+        // Coverage-ignore(suite): Not run.
         "Cannot assign to variable $variable");
     return new VariableSet(variable, value)..fileOffset = fileOffset;
   }
@@ -151,7 +153,8 @@
     required int fileOffset}) {
   return new LocalFunctionInvocation(
       variable,
-      arguments ?? createArguments([], fileOffset: fileOffset)
+      arguments ?? // Coverage-ignore(suite): Not run.
+          createArguments([], fileOffset: fileOffset)
         ..fileOffset = fileOffset,
       functionType: variable.type as FunctionType)
     ..fileOffset = fileOffset;
diff --git a/pkg/front_end/lib/src/type_inference/factor_type.dart b/pkg/front_end/lib/src/type_inference/factor_type.dart
index ab6c5e8..d4c1c1e 100644
--- a/pkg/front_end/lib/src/type_inference/factor_type.dart
+++ b/pkg/front_end/lib/src/type_inference/factor_type.dart
@@ -33,6 +33,7 @@
   // * Else if T is R* and Null <: S then factor(R, S)
   // * Else if T is R* then factor(R, S)*
   if (T.declaredNullability == Nullability.legacy) {
+    // Coverage-ignore-block(suite): Not run.
     DartType R = T.withDeclaredNullability(Nullability.nonNullable);
     DartType factor_RS = factorType(typeEnvironment, R, S);
     if (typeEnvironment.isSubtypeOf(
@@ -53,6 +54,7 @@
       return factorType(typeEnvironment, R, S);
     }
     if (typeEnvironment.isSubtypeOf(R, S, SubtypeCheckMode.withNullabilities)) {
+      // Coverage-ignore-block(suite): Not run.
       return factorType(typeEnvironment, future_R, S);
     }
   }
diff --git a/pkg/front_end/lib/src/type_inference/for_in.dart b/pkg/front_end/lib/src/type_inference/for_in.dart
index 9afa05d..794d9ab 100644
--- a/pkg/front_end/lib/src/type_inference/for_in.dart
+++ b/pkg/front_end/lib/src/type_inference/for_in.dart
@@ -74,6 +74,7 @@
   PatternVariableDeclarationForInVariable(this.patternVariableDeclaration);
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType computeElementType(InferenceVisitorBase visitor) {
     return (patternVariableDeclaration.initializer as VariableGet)
         .variable
@@ -117,6 +118,7 @@
       if (writeTarget.isInstanceMember || writeTarget.isObjectMember) {
         if (visitor.instrumentation != null &&
             receiverType == const DynamicType()) {
+          // Coverage-ignore-block(suite): Not run.
           visitor.instrumentation!.record(
               visitor.uriForInstrumentation,
               propertySet.fileOffset,
@@ -147,6 +149,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class AbstractSuperPropertyForInVariable implements ForInVariable {
   final AbstractSuperPropertySet superPropertySet;
 
@@ -197,7 +200,9 @@
     ObjectAccessTarget writeTarget = visitor.findInterfaceMember(
         receiverType, superPropertySet.name, superPropertySet.fileOffset,
         isSetter: true, instrumented: true);
-    assert(writeTarget.isInstanceMember || writeTarget.isObjectMember);
+    assert(writeTarget.isInstanceMember ||
+        // Coverage-ignore(suite): Not run.
+        writeTarget.isObjectMember);
     return _writeType = writeTarget.getSetterType(visitor);
   }
 
diff --git a/pkg/front_end/lib/src/type_inference/inference_results.dart b/pkg/front_end/lib/src/type_inference/inference_results.dart
index b3c398c..e51ff0b 100644
--- a/pkg/front_end/lib/src/type_inference/inference_results.dart
+++ b/pkg/front_end/lib/src/type_inference/inference_results.dart
@@ -24,6 +24,7 @@
     if (statements.length == 0) {
       return const StatementInferenceResult();
     } else if (statements.length == 1) {
+      // Coverage-ignore-block(suite): Not run.
       return new SingleStatementInferenceResult(statements.single);
     } else {
       return new MultipleStatementInferenceResult(fileOffset, statements);
@@ -32,12 +33,15 @@
 
   bool get hasChanged => false;
 
+  // Coverage-ignore(suite): Not run.
   Statement get statement =>
       throw new UnsupportedError('StatementInferenceResult.statement');
 
+  // Coverage-ignore(suite): Not run.
   int get statementCount =>
       throw new UnsupportedError('StatementInferenceResult.statementCount');
 
+  // Coverage-ignore(suite): Not run.
   List<Statement> get statements =>
       throw new UnsupportedError('StatementInferenceResult.statements');
 }
@@ -55,6 +59,7 @@
   int get statementCount => 1;
 
   @override
+  // Coverage-ignore(suite): Not run.
   List<Statement> get statements =>
       throw new UnsupportedError('SingleStatementInferenceResult.statements');
 }
@@ -76,6 +81,7 @@
   bool get hasChanged => true;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Statement get statement {
     if (statements.length == 1) {
       return statements.single;
@@ -147,9 +153,11 @@
         return InvocationInferenceResult._insertHoistedExpressions(
             expression, hoistedArguments);
       } else if (expression is TypeAliasedConstructorInvocation) {
+        // Coverage-ignore-block(suite): Not run.
         return InvocationInferenceResult._insertHoistedExpressions(
             expression, hoistedArguments);
       } else if (expression is TypeAliasedFactoryInvocation) {
+        // Coverage-ignore-block(suite): Not run.
         return InvocationInferenceResult._insertHoistedExpressions(
             expression, hoistedArguments);
       } else if (expression is ConstructorInvocation) {
@@ -353,7 +361,9 @@
 
   ExpressionInferenceResult(this.inferredType, this.expression,
       {this.postCoercionType = null})
-      : assert(isKnown(inferredType), "$inferredType is not known.");
+      : assert(
+            isKnown(inferredType), // Coverage-ignore(suite): Not run.
+            "$inferredType is not known.");
 
   /// The guards used for null-aware access if the expression is part of a
   /// null-shorting.
@@ -457,6 +467,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType? get postCoercionType => null;
 
   @override
diff --git a/pkg/front_end/lib/src/type_inference/inference_visitor.dart b/pkg/front_end/lib/src/type_inference/inference_visitor.dart
index a055292..f261a21 100644
--- a/pkg/front_end/lib/src/type_inference/inference_visitor.dart
+++ b/pkg/front_end/lib/src/type_inference/inference_visitor.dart
@@ -191,6 +191,7 @@
 
   /// Used to report an internal error encountered in the stack listener.
   @override
+  // Coverage-ignore(suite): Not run.
   Never internalProblem(Message message, int charOffset, Uri uri) {
     return problems.internalProblem(message, charOffset, uri);
   }
@@ -290,10 +291,12 @@
     if (coreTypes.isBottom(result.inferredType)) {
       flowAnalysis.handleExit();
       if (shouldThrowUnsoundnessException &&
+          // Coverage-ignore(suite): Not run.
           // Don't throw on expressions that inherently return the bottom type.
           !(result.nullAwareAction is Throw ||
               result.nullAwareAction is Rethrow ||
               result.nullAwareAction is InvalidExpression)) {
+        // Coverage-ignore-block(suite): Not run.
         Expression replacement = createLet(
             createVariable(result.expression, result.inferredType),
             createReachabilityError(
@@ -367,6 +370,7 @@
     return nullAwareGuards;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Computes uri and offset for [node] for internal errors in a way that is
   /// safe for both top-level and full inference.
   UriOffset _computeUriOffset(TreeNode node) {
@@ -375,6 +379,7 @@
     return new UriOffset(uri, fileOffset);
   }
 
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult _unhandledExpression(
       Expression node, DartType typeContext) {
     UriOffset uriOffset = _computeUriOffset(node);
@@ -389,6 +394,7 @@
     // therefore doesn't specify the type context for the subterms.
     StatementInferenceResult bodyResult = inferStatement(node.body);
     if (bodyResult.hasChanged) {
+      // Coverage-ignore-block(suite): Not run.
       node.body = (bodyResult.statement as Block)..parent = node;
     }
     ExpressionInferenceResult valueResult =
@@ -398,6 +404,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitConstantExpression(
       ConstantExpression node, DartType typeContext) {
     return _unhandledExpression(node, typeContext);
@@ -414,6 +421,7 @@
         resultType = const DynamicType();
         break;
       case DynamicAccessKind.Never:
+        // Coverage-ignore(suite): Not run.
         resultType = NeverType.fromNullability(Nullability.nonNullable);
         break;
       case DynamicAccessKind.Invalid:
@@ -425,6 +433,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitInstanceGet(
       InstanceGet node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -433,6 +442,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitInstanceTearOff(
       InstanceTearOff node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -441,6 +451,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitDynamicInvocation(
       DynamicInvocation node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -449,6 +460,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitDynamicSet(
       DynamicSet node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -457,6 +469,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitEqualsCall(
       EqualsCall node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -465,6 +478,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitEqualsNull(
       EqualsNull node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -473,6 +487,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitFunctionInvocation(
       FunctionInvocation node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -481,6 +496,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitInstanceInvocation(
       InstanceInvocation node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -489,6 +505,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitInstanceGetterInvocation(
       InstanceGetterInvocation node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -497,6 +514,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitInstanceSet(
       InstanceSet node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -505,6 +523,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitLocalFunctionInvocation(
       LocalFunctionInvocation node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -522,6 +541,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitFunctionTearOff(
       FunctionTearOff node, DartType typeContext) {
     // This node is created as part of a lowering and doesn't need inference.
@@ -539,6 +559,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitInstanceCreation(
       InstanceCreation node, DartType typeContext) {
     return _unhandledExpression(node, typeContext);
@@ -570,6 +591,7 @@
     node.expression = expressionResult.expression..parent = node;
     assert(
         expressionResult.inferredType is FunctionType,
+        // Coverage-ignore(suite): Not run.
         "Expected a FunctionType from tearing off a constructor from "
         "a typedef, but got '${expressionResult.inferredType.runtimeType}'.");
     FunctionType expressionType = expressionResult.inferredType as FunctionType;
@@ -592,23 +614,27 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitListConcatenation(
       ListConcatenation node, DartType typeContext) {
     return _unhandledExpression(node, typeContext);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitMapConcatenation(
       MapConcatenation node, DartType typeContext) {
     return _unhandledExpression(node, typeContext);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitSetConcatenation(
       SetConcatenation node, DartType typeContext) {
     return _unhandledExpression(node, typeContext);
   }
 
+  // Coverage-ignore(suite): Not run.
   StatementInferenceResult _unhandledStatement(Statement node) {
     UriOffset uriOffset = _computeUriOffset(node);
     return problems.unhandled("${node.runtimeType}", "InferenceVisitor",
@@ -616,31 +642,37 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   StatementInferenceResult visitAssertBlock(AssertBlock node) {
     return _unhandledStatement(node);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   StatementInferenceResult visitTryCatch(TryCatch node) {
     return _unhandledStatement(node);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   StatementInferenceResult visitTryFinally(TryFinally node) {
     return _unhandledStatement(node);
   }
 
+  // Coverage-ignore(suite): Not run.
   Never _unhandledInitializer(Initializer node) {
     problems.unhandled("${node.runtimeType}", "InferenceVisitor",
         node.fileOffset, node.location!.file);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   InitializerInferenceResult visitInvalidInitializer(InvalidInitializer node) {
     _unhandledInitializer(node);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   InitializerInferenceResult visitLocalInitializer(LocalInitializer node) {
     _unhandledInitializer(node);
   }
@@ -709,6 +741,7 @@
         case ObjectAccessTargetKind.recordNamed:
         case ObjectAccessTargetKind.nullableExtensionTypeMember:
         case ObjectAccessTargetKind.extensionTypeRepresentation:
+        // Coverage-ignore(suite): Not run.
         case ObjectAccessTargetKind.nullableExtensionTypeRepresentation:
           break;
       }
@@ -785,6 +818,7 @@
   InitializerInferenceResult visitAssertInitializer(AssertInitializer node) {
     StatementInferenceResult result = inferStatement(node.statement);
     if (result.hasChanged) {
+      // Coverage-ignore-block(suite): Not run.
       node.statement = (result.statement as AssertStatement)..parent = node;
     }
     return const SuccessfulInitializerInferenceResult();
@@ -825,6 +859,7 @@
         case TypeParameterType():
           return _isIncompatibleWithAwait(type.parameter.bound);
         case StructuralParameterType():
+          // Coverage-ignore(suite): Not run.
           return _isIncompatibleWithAwait(type.parameter.bound);
         case IntersectionType():
           return _isIncompatibleWithAwait(type.right);
@@ -900,7 +935,9 @@
     List<Statement>? result = _visitStatements<Statement>(node.statements);
     if (result != null) {
       Block block = new Block(result)..fileOffset = node.fileOffset;
-      libraryBuilder.loader.dataForTesting?.registerAlias(node, block);
+      libraryBuilder.loader.dataForTesting
+          // Coverage-ignore(suite): Not run.
+          ?.registerAlias(node, block);
       return new StatementInferenceResult.single(block);
     } else {
       return const StatementInferenceResult();
@@ -1198,6 +1235,7 @@
     Expression readReceiver;
     Expression writeReceiver;
     if (isPureExpression(receiver)) {
+      // Coverage-ignore-block(suite): Not run.
       readReceiver = receiver;
       writeReceiver = clonePureExpression(receiver);
     } else {
@@ -1215,6 +1253,7 @@
 
     Expression read;
     if (readTarget.isMissing) {
+      // Coverage-ignore-block(suite): Not run.
       read = createMissingPropertyGet(
           node.readOffset, readType, node.propertyName,
           receiver: readReceiver);
@@ -1309,6 +1348,7 @@
     flowAnalysis.doStatement_bodyBegin(node);
     StatementInferenceResult bodyResult = inferStatement(node.body);
     if (bodyResult.hasChanged) {
+      // Coverage-ignore-block(suite): Not run.
       node.body = bodyResult.statement..parent = node;
     }
     flowAnalysis.doStatement_conditionBegin();
@@ -1425,7 +1465,9 @@
   /// Returns the function type of [factory] when called through [typedef].
   FunctionType _computeAliasedFactoryFunctionType(
       Procedure factory, Typedef typedef) {
-    assert(factory.isFactory || factory.isExtensionTypeMember,
+    assert(
+        factory.isFactory || factory.isExtensionTypeMember,
+        // Coverage-ignore(suite): Not run.
         "Only run this method on a factory: $factory");
     ensureMemberType(factory);
     FunctionNode function = factory.function;
@@ -1451,9 +1493,11 @@
             substitution.substituteType(decl.type))
         .toList(growable: false);
     List<NamedType> named = function.namedParameters
-        .map((VariableDeclaration decl) => new NamedType(
-            decl.name!, substitution.substituteType(decl.type),
-            isRequired: decl.isRequired))
+        .map(
+            // Coverage-ignore(suite): Not run.
+            (VariableDeclaration decl) => new NamedType(
+                decl.name!, substitution.substituteType(decl.type),
+                isRequired: decl.isRequired))
         .toList(growable: false);
     named.sort();
     return new FunctionType(
@@ -1543,6 +1587,7 @@
       variable = tempVariable;
     }
     if (expressionEffects != null) {
+      // Coverage-ignore-block(suite): Not run.
       StatementInferenceResult bodyResult = inferStatement(expressionEffects);
       if (bodyResult.hasChanged) {
         expressionEffects = bodyResult.statement;
@@ -1598,6 +1643,7 @@
     } else if (syntheticAssignment is PropertySet) {
       return new PropertyForInVariable(syntheticAssignment);
     } else if (syntheticAssignment is AbstractSuperPropertySet) {
+      // Coverage-ignore-block(suite): Not run.
       return new AbstractSuperPropertyForInVariable(syntheticAssignment);
     } else if (syntheticAssignment is SuperPropertySet) {
       return new SuperPropertyForInVariable(syntheticAssignment);
@@ -1606,6 +1652,7 @@
     } else if (syntheticAssignment is InvalidExpression || hasProblem) {
       return new InvalidForInVariable(syntheticAssignment);
     } else {
+      // Coverage-ignore-block(suite): Not run.
       UriOffset uriOffset = _computeUriOffset(syntheticAssignment!);
       return problems.unhandled(
           "${syntheticAssignment.runtimeType}",
@@ -1639,8 +1686,11 @@
     }
     if (expressionEffects != null) {
       StatementInferenceResult result = inferStatement(expressionEffects);
-      expressionEffects =
-          result.hasChanged ? result.statement : expressionEffects;
+      expressionEffects = result.hasChanged
+          ?
+          // Coverage-ignore(suite): Not run.
+          result.statement
+          : expressionEffects;
     }
 
     return new ForInResult(variable, iterableResult.expression,
@@ -1677,6 +1727,7 @@
 
     Object? rewrite = popRewrite();
     if (!identical(rewrite, patternVariableDeclaration.pattern)) {
+      // Coverage-ignore-block(suite): Not run.
       patternVariableDeclaration.pattern = (rewrite as Pattern)
         ..parent = patternVariableDeclaration;
     }
@@ -1707,6 +1758,7 @@
     syntheticAssignment =
         forInVariable.inferAssignment(this, result.elementType);
     if (syntheticAssignment is VariableSet) {
+      // Coverage-ignore-block(suite): Not run.
       flowAnalysis.write(node, variable, result.elementType, null);
     }
 
@@ -1751,6 +1803,7 @@
       body = combineStatements(result.expressionSideEffects!, body);
     }
     if (result.syntheticAssignment != null) {
+      // Coverage-ignore-block(suite): Not run.
       body = combineStatements(
           createExpressionStatement(result.syntheticAssignment!), body);
     }
@@ -1773,7 +1826,11 @@
     // [handleForInWithoutVariable] or [handleForInDeclaringVariable].
     flowAnalysis.forEach_end();
 
-    Statement body = bodyResult.hasChanged ? bodyResult.statement : node.body;
+    Statement body = bodyResult.hasChanged
+        ?
+        // Coverage-ignore(suite): Not run.
+        bodyResult.statement
+        : node.body;
     if (result.expressionSideEffects != null) {
       body = combineStatements(result.expressionSideEffects!, body);
     }
@@ -1786,7 +1843,9 @@
         isAsync: node.isAsync)
       ..fileOffset = node.fileOffset
       ..bodyOffset = node.bodyOffset;
-    libraryBuilder.loader.dataForTesting?.registerAlias(node, replacement);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(node, replacement);
     return new StatementInferenceResult.single(replacement);
   }
 
@@ -1806,6 +1865,7 @@
       } else {
         StatementInferenceResult variableResult = inferStatement(variable);
         if (variableResult.hasChanged) {
+          // Coverage-ignore-block(suite): Not run.
           if (variables == null) {
             variables = <VariableDeclaration>[];
             variables.addAll(node.variables.sublist(0, index));
@@ -1817,12 +1877,15 @@
               variables.add(variable as VariableDeclaration);
             }
           }
-        } else if (variables != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (variables != null) {
           variables.add(variable);
         }
       }
     }
     if (variables != null) {
+      // Coverage-ignore-block(suite): Not run.
       node.variables.clear();
       node.variables.addAll(variables);
       setParents(variables, node);
@@ -1841,6 +1904,7 @@
     flowAnalysis.for_bodyBegin(node, node.condition);
     StatementInferenceResult bodyResult = inferStatement(node.body);
     if (bodyResult.hasChanged) {
+      // Coverage-ignore-block(suite): Not run.
       node.body = bodyResult.statement..parent = node;
     }
     flowAnalysis.for_updaterBegin();
@@ -1872,7 +1936,10 @@
         node.hasImplicitReturnType ? null : node.function.returnType;
     FunctionType inferredType =
         visitFunctionNode(node.function, null, returnContext, node.fileOffset);
-    if (dataForTesting != null && node.hasImplicitReturnType) {
+    if (dataForTesting != null &&
+        // Coverage-ignore(suite): Not run.
+        node.hasImplicitReturnType) {
+      // Coverage-ignore-block(suite): Not run.
       dataForTesting!.typeInferenceResult.inferredVariableTypes[node] =
           inferredType.returnType;
     }
@@ -1892,6 +1959,7 @@
     FunctionType inferredType =
         visitFunctionNode(node.function, typeContext, null, node.fileOffset);
     if (dataForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       dataForTesting!.typeInferenceResult.inferredVariableTypes[node] =
           inferredType.returnType;
     }
@@ -2000,6 +2068,7 @@
       StatementInferenceResult otherwiseResult =
           inferStatement(node.otherwise!);
       if (otherwiseResult.hasChanged) {
+        // Coverage-ignore-block(suite): Not run.
         node.otherwise = otherwiseResult.statement..parent = node;
       }
     }
@@ -2032,10 +2101,12 @@
 
     Object? rewrite = popRewrite(NullValues.Statement);
     if (!identical(node.otherwise, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       node.otherwise = (rewrite as Statement)..parent = node;
     }
     rewrite = popRewrite();
     if (!identical(node.then, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       node.then = (rewrite as Statement)..parent = node;
     }
     rewrite = popRewrite(NullValues.Expression);
@@ -2085,6 +2156,7 @@
     Expression? error = checkWebIntLiteralsErrorIfUnexact(
         node.value, node.literal, node.fileOffset);
     if (error != null) {
+      // Coverage-ignore-block(suite): Not run.
       return new ExpressionInferenceResult(const DynamicType(), error);
     }
     DartType inferredType = coreTypes.intRawType(Nullability.nonNullable);
@@ -2094,6 +2166,7 @@
   ExpressionInferenceResult visitShadowLargeIntLiteral(
       ShadowLargeIntLiteral node, DartType typeContext) {
     if (isDoubleContext(typeContext)) {
+      // Coverage-ignore-block(suite): Not run.
       double? doubleValue = node.asDouble();
       if (doubleValue != null) {
         Expression replacement = new DoubleLiteral(doubleValue)
@@ -2106,6 +2179,7 @@
 
     int? intValue = node.asInt64();
     if (intValue == null) {
+      // Coverage-ignore-block(suite): Not run.
       Expression replacement = helper.buildProblem(
           templateIntegerLiteralIsOutOfRange.withArguments(node.literal),
           node.fileOffset,
@@ -2115,6 +2189,7 @@
     Expression? error = checkWebIntLiteralsErrorIfUnexact(
         intValue, node.literal, node.fileOffset);
     if (error != null) {
+      // Coverage-ignore-block(suite): Not run.
       return new ExpressionInferenceResult(const DynamicType(), error);
     }
     Expression replacement = new IntLiteral(intValue);
@@ -2159,6 +2234,7 @@
     StatementInferenceResult bodyResult = inferStatement(node.body);
     flowAnalysis.labeledStatement_end();
     if (bodyResult.hasChanged) {
+      // Coverage-ignore-block(suite): Not run.
       node.body = bodyResult.statement..parent = node;
     }
     return const StatementInferenceResult();
@@ -2223,6 +2299,7 @@
               context: getWhyNotPromotedContext(
                   flowAnalysis.whyNotPromoted(receiver)(),
                   element,
+                  // Coverage-ignore(suite): Not run.
                   (type) => !type.isPotentiallyNullable));
         }
 
@@ -2273,6 +2350,7 @@
             context: getWhyNotPromotedContext(
                 flowAnalysis.whyNotPromoted(receiver)(),
                 element,
+                // Coverage-ignore(suite): Not run.
                 (type) => !type.isPotentiallyNullable));
         _copyNonPromotionReasonToReplacement(element, replacement);
       }
@@ -2355,11 +2433,13 @@
 
     Object? rewrite = popRewrite(NullValues.Expression);
     if (!identical(element.otherwise, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       element.otherwise = (rewrite as Expression?)?..parent = element;
     }
 
     rewrite = popRewrite();
     if (!identical(element.then, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       element.then = (rewrite as Expression)..parent = element;
     }
 
@@ -2367,6 +2447,7 @@
     rewrite = popRewrite(NullValues.Expression);
     InvalidExpression? guardError = analysisResult.nonBooleanGuardError;
     if (guardError != null) {
+      // Coverage-ignore-block(suite): Not run.
       patternGuard.guard = guardError..parent = patternGuard;
     } else {
       if (!identical(patternGuard.guard, rewrite)) {
@@ -2381,11 +2462,13 @@
 
     rewrite = popRewrite();
     if (!identical(patternGuard.pattern, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       patternGuard.pattern = (rewrite as Pattern)..parent = patternGuard;
     }
 
     rewrite = popRewrite();
     if (!identical(element.expression, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       element.expression = (rewrite as Expression)..parent = patternGuard;
     }
 
@@ -2428,6 +2511,7 @@
 
       Object? rewrite = popRewrite(NullValues.Expression);
       if (!identical(patternVariableDeclaration.pattern, rewrite)) {
+        // Coverage-ignore-block(suite): Not run.
         patternVariableDeclaration.pattern = (rewrite as Pattern)
           ..parent = patternVariableDeclaration;
       }
@@ -2464,6 +2548,7 @@
       } else {
         StatementInferenceResult variableResult = inferStatement(variable);
         if (variableResult.hasChanged) {
+          // Coverage-ignore-block(suite): Not run.
           if (variables == null) {
             variables = <VariableDeclaration>[];
             variables.addAll(element.variables.sublist(0, index));
@@ -2475,12 +2560,15 @@
               variables.add(variable as VariableDeclaration);
             }
           }
-        } else if (variables != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (variables != null) {
           variables.add(variable);
         }
       }
     }
     if (variables != null) {
+      // Coverage-ignore-block(suite): Not run.
       element.variables.clear();
       element.variables.addAll(variables);
       setParents(variables, element);
@@ -2539,6 +2627,7 @@
     result.expressionSideEffects?.parent = element;
 
     if (element.problem != null) {
+      // Coverage-ignore-block(suite): Not run.
       ExpressionInferenceResult problemResult = inferExpression(
           element.problem!, const UnknownType(),
           isVoidAllowed: true);
@@ -2587,7 +2676,11 @@
   void _copyNonPromotionReasonToReplacement(
       TreeNode oldNode, TreeNode replacement) {
     if (!identical(oldNode, replacement) &&
-        dataForTesting?.flowAnalysisResult != null) {
+        dataForTesting
+                // Coverage-ignore(suite): Not run.
+                ?.flowAnalysisResult !=
+            null) {
+      // Coverage-ignore-block(suite): Not run.
       dataForTesting!.flowAnalysisResult.nonPromotionReasons[replacement] =
           dataForTesting!.flowAnalysisResult.nonPromotionReasons[oldNode]!;
     }
@@ -2663,7 +2756,9 @@
           listType, typeParametersToInfer, typeContext,
           isConst: node.isConst,
           typeOperations: operations,
-          inferenceResultForTesting: dataForTesting?.typeInferenceResult,
+          inferenceResultForTesting: dataForTesting
+              // Coverage-ignore(suite): Not run.
+              ?.typeInferenceResult,
           treeNodeForTesting: node);
       inferredTypes = typeSchemaEnvironment.choosePreliminaryTypes(
           gatherer, typeParametersToInfer, null);
@@ -2686,6 +2781,7 @@
       inferredTypes = typeSchemaEnvironment.chooseFinalTypes(
           gatherer, typeParametersToInfer, inferredTypes!);
       if (dataForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         dataForTesting!.typeInferenceResult.inferredTypeArguments[node] =
             inferredTypes;
       }
@@ -2714,6 +2810,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitRecordLiteral(
       RecordLiteral node, DartType typeContext) {
     // TODO(cstefantsova): Implement this method.
@@ -2797,6 +2894,7 @@
       // Create a list or set with the elements up to the first non-expression.
       if (isSet) {
         if (libraryBuilder.loader.target.backendTarget.supportsSetLiterals) {
+          // Coverage-ignore-block(suite): Not run.
           // Include the elements up to the first non-expression in the set
           // literal.
           result = _createVariable(
@@ -2904,11 +3002,15 @@
     if (elseStatements != null && elseStatements.isNotEmpty) {
       elseBody = elseStatements.length == 1
           ? elseStatements.first
-          : _createBlock(elseStatements);
+          :
+          // Coverage-ignore(suite): Not run.
+          _createBlock(elseStatements);
     }
     IfStatement ifStatement =
         _createIf(element.fileOffset, element.condition, thenBody, elseBody);
-    libraryBuilder.loader.dataForTesting?.registerAlias(element, ifStatement);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(element, ifStatement);
     body.add(ifStatement);
   }
 
@@ -2931,12 +3033,16 @@
     }
     Statement thenBody = thenStatements.length == 1
         ? thenStatements.first
-        : _createBlock(thenStatements);
+        :
+        // Coverage-ignore(suite): Not run.
+        _createBlock(thenStatements);
     Statement? elseBody;
     if (elseStatements != null && elseStatements.isNotEmpty) {
       elseBody = elseStatements.length == 1
           ? elseStatements.first
-          : _createBlock(elseStatements);
+          :
+          // Coverage-ignore(suite): Not run.
+          _createBlock(elseStatements);
     }
     IfCaseStatement ifCaseStatement = _createIfCase(
         element.fileOffset,
@@ -2946,6 +3052,7 @@
         thenBody,
         elseBody);
     libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
         ?.registerAlias(element, ifCaseStatement);
     body.addAll(element.prelude);
     body.add(ifCaseStatement);
@@ -2962,7 +3069,9 @@
         statements.length == 1 ? statements.first : _createBlock(statements);
     ForStatement loop = _createForStatement(element.fileOffset,
         element.variables, element.condition, element.updates, loopBody);
-    libraryBuilder.loader.dataForTesting?.registerAlias(element, loop);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(element, loop);
     body.add(loop);
   }
 
@@ -2977,11 +3086,16 @@
     _translateElement(
         element.body, receiverType, elementType, result, statements,
         isSet: isSet);
-    Statement loopBody =
-        statements.length == 1 ? statements.first : _createBlock(statements);
+    Statement loopBody = statements.length == 1
+        ? statements.first
+        :
+        // Coverage-ignore(suite): Not run.
+        _createBlock(statements);
     ForStatement loop = _createForStatement(element.fileOffset,
         element.variables, element.condition, element.updates, loopBody);
-    libraryBuilder.loader.dataForTesting?.registerAlias(element, loop);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(element, loop);
     body.add(element.patternVariableDeclaration);
     body.addAll(element.intermediateVariables);
     body.add(loop);
@@ -2995,8 +3109,11 @@
     if (prologue == null) {
       statements = <Statement>[];
     } else {
-      statements =
-          prologue is Block ? prologue.statements : <Statement>[prologue];
+      statements = prologue is Block
+          ?
+          // Coverage-ignore(suite): Not run.
+          prologue.statements
+          : <Statement>[prologue];
     }
     _translateElement(
         element.body, receiverType, elementType, result, statements,
@@ -3004,12 +3121,15 @@
     Statement loopBody =
         statements.length == 1 ? statements.first : _createBlock(statements);
     if (element.problem != null) {
+      // Coverage-ignore-block(suite): Not run.
       body.add(_createExpressionStatement(element.problem!));
     }
     ForInStatement loop = _createForInStatement(
         element.fileOffset, element.variable, element.iterable, loopBody,
         isAsync: element.isAsync);
-    libraryBuilder.loader.dataForTesting?.registerAlias(element, loop);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(element, loop);
     body.add(loop);
   }
 
@@ -3250,12 +3370,17 @@
         thenBody.length == 1 ? thenBody.first : _createBlock(thenBody);
     Statement? elseStatement;
     if (elseBody != null && elseBody.isNotEmpty) {
-      elseStatement =
-          elseBody.length == 1 ? elseBody.first : _createBlock(elseBody);
+      elseStatement = elseBody.length == 1
+          ? elseBody.first
+          :
+          // Coverage-ignore(suite): Not run.
+          _createBlock(elseBody);
     }
     IfStatement ifStatement = _createIf(
         entry.fileOffset, entry.condition, thenStatement, elseStatement);
-    libraryBuilder.loader.dataForTesting?.registerAlias(entry, ifStatement);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(entry, ifStatement);
     body.add(ifStatement);
   }
 
@@ -3274,12 +3399,18 @@
       _translateEntry(entry.otherwise!, receiverType, keyType, valueType,
           result, elseBody = <Statement>[]);
     }
-    Statement thenStatement =
-        thenBody.length == 1 ? thenBody.first : _createBlock(thenBody);
+    Statement thenStatement = thenBody.length == 1
+        ? thenBody.first
+        :
+        // Coverage-ignore(suite): Not run.
+        _createBlock(thenBody);
     Statement? elseStatement;
     if (elseBody != null && elseBody.isNotEmpty) {
-      elseStatement =
-          elseBody.length == 1 ? elseBody.first : _createBlock(elseBody);
+      elseStatement = elseBody.length == 1
+          ? elseBody.first
+          :
+          // Coverage-ignore(suite): Not run.
+          _createBlock(elseBody);
     }
     IfCaseStatement ifStatement = _createIfCase(
         entry.fileOffset,
@@ -3288,7 +3419,9 @@
         entry.patternGuard,
         thenStatement,
         elseStatement);
-    libraryBuilder.loader.dataForTesting?.registerAlias(entry, ifStatement);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(entry, ifStatement);
     body.addAll(entry.prelude);
     body.add(ifStatement);
   }
@@ -3307,7 +3440,9 @@
         statements.length == 1 ? statements.first : _createBlock(statements);
     ForStatement loop = _createForStatement(entry.fileOffset, entry.variables,
         entry.condition, entry.updates, loopBody);
-    libraryBuilder.loader.dataForTesting?.registerAlias(entry, loop);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(entry, loop);
     body.add(loop);
   }
 
@@ -3325,7 +3460,9 @@
         statements.length == 1 ? statements.first : _createBlock(statements);
     ForStatement loop = _createForStatement(entry.fileOffset, entry.variables,
         entry.condition, entry.updates, loopBody);
-    libraryBuilder.loader.dataForTesting?.registerAlias(entry, loop);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(entry, loop);
     body.add(entry.patternVariableDeclaration);
     body.addAll(entry.intermediateVariables);
     body.add(loop);
@@ -3343,20 +3480,26 @@
     if (prologue == null) {
       statements = <Statement>[];
     } else {
-      statements =
-          prologue is Block ? prologue.statements : <Statement>[prologue];
+      statements = prologue is Block
+          ?
+          // Coverage-ignore(suite): Not run.
+          prologue.statements
+          : <Statement>[prologue];
     }
     _translateEntry(
         entry.body, receiverType, keyType, valueType, result, statements);
     Statement loopBody =
         statements.length == 1 ? statements.first : _createBlock(statements);
     if (entry.problem != null) {
+      // Coverage-ignore-block(suite): Not run.
       body.add(_createExpressionStatement(entry.problem!));
     }
     ForInStatement loop = _createForInStatement(
         entry.fileOffset, entry.variable, entry.iterable, loopBody,
         isAsync: entry.isAsync);
-    libraryBuilder.loader.dataForTesting?.registerAlias(entry, loop);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(entry, loop);
     body.add(loop);
   }
 
@@ -3520,6 +3663,7 @@
           parts.add(spreadExpression);
         }
       } else if (element is IfElement) {
+        // Coverage-ignore-block(suite): Not run.
         if (currentPart != null) {
           parts.add(makeLiteral(node.fileOffset, currentPart));
           currentPart = null;
@@ -3532,6 +3676,7 @@
         parts.add(_createConditionalExpression(
             element.fileOffset, condition, then, otherwise, iterableType));
       } else if (element is ForElement || element is ForInElement) {
+        // Coverage-ignore-block(suite): Not run.
         // Rejected earlier.
         problems.unhandled("${element.runtimeType}", "_translateConstListOrSet",
             element.fileOffset, helper.uri);
@@ -3594,6 +3739,7 @@
           parts.add(spreadExpression);
         }
       } else if (entry is IfMapEntry) {
+        // Coverage-ignore-block(suite): Not run.
         if (currentPart != null) {
           parts.add(makeLiteral(node.fileOffset, currentPart));
           currentPart = null;
@@ -3606,6 +3752,7 @@
         parts.add(_createConditionalExpression(
             entry.fileOffset, condition, then, otherwise, collectionType));
       } else if (entry is ForMapEntry || entry is ForInMapEntry) {
+        // Coverage-ignore-block(suite): Not run.
         // Rejected earlier.
         problems.unhandled("${entry.runtimeType}", "_translateConstMap",
             entry.fileOffset, helper.uri);
@@ -3646,6 +3793,7 @@
       return new VariableGet(variable, promotedType)
         ..fileOffset = variable.fileOffset;
     }
+    // Coverage-ignore(suite): Not run.
     return _createVariableGet(variable);
   }
 
@@ -3678,7 +3826,9 @@
   Expression _createAdd(
       Expression receiver, InterfaceType receiverType, Expression argument,
       {required bool isSet}) {
-    assert(argument.fileOffset != TreeNode.noOffset,
+    assert(
+        argument.fileOffset != TreeNode.noOffset,
+        // Coverage-ignore(suite): Not run.
         "No fileOffset on ${argument}.");
     DartType functionType = Substitution.fromInterfaceType(receiverType)
         .substituteType(
@@ -3693,7 +3843,9 @@
 
   Expression _createAddAll(Expression receiver, InterfaceType receiverType,
       Expression argument, bool isSet) {
-    assert(argument.fileOffset != TreeNode.noOffset,
+    assert(
+        argument.fileOffset != TreeNode.noOffset,
+        // Coverage-ignore(suite): Not run.
         "No fileOffset on ${argument}.");
     DartType functionType = Substitution.fromInterfaceType(receiverType)
         .substituteType(isSet
@@ -3709,7 +3861,9 @@
 
   Expression _createMapAddAll(
       Expression receiver, InterfaceType receiverType, Expression argument) {
-    assert(argument.fileOffset != TreeNode.noOffset,
+    assert(
+        argument.fileOffset != TreeNode.noOffset,
+        // Coverage-ignore(suite): Not run.
         "No fileOffset on ${argument}.");
     DartType functionType = Substitution.fromInterfaceType(receiverType)
         .substituteType(engine.mapAddAllFunctionType);
@@ -3921,6 +4075,7 @@
               context: getWhyNotPromotedContext(
                   flowAnalysis.whyNotPromoted(receiver)(),
                   entry,
+                  // Coverage-ignore(suite): Not run.
                   (type) => !type.isPotentiallyNullable));
           _copyNonPromotionReasonToReplacement(entry, problem);
           replacement = new SpreadMapEntry(problem, isNullAware: false)
@@ -3939,6 +4094,7 @@
             context: getWhyNotPromotedContext(
                 flowAnalysis.whyNotPromoted(receiver)(),
                 entry,
+                // Coverage-ignore(suite): Not run.
                 (type) => !type.isPotentiallyNullable));
         _copyNonPromotionReasonToReplacement(entry, problem);
         replacement = new MapLiteralEntry(problem, new NullLiteral())
@@ -4021,6 +4177,7 @@
             context: getWhyNotPromotedContext(
                 flowAnalysis.whyNotPromoted(receiver)(),
                 entry,
+                // Coverage-ignore(suite): Not run.
                 (type) => !type.isPotentiallyNullable));
         _copyNonPromotionReasonToReplacement(entry, keyError);
       }
@@ -4197,11 +4354,13 @@
 
     Object? rewrite = popRewrite(NullValues.Expression);
     if (!identical(entry.otherwise, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       entry.otherwise = (rewrite as MapLiteralEntry?)?..parent = entry;
     }
 
     rewrite = popRewrite();
     if (!identical(entry.then, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       entry.then = (rewrite as MapLiteralEntry)..parent = entry;
     }
 
@@ -4209,9 +4368,11 @@
     rewrite = popRewrite(NullValues.Expression);
     InvalidExpression? guardError = analysisResult.nonBooleanGuardError;
     if (guardError != null) {
+      // Coverage-ignore-block(suite): Not run.
       patternGuard.guard = guardError..parent = patternGuard;
     } else {
       if (!identical(patternGuard.guard, rewrite)) {
+        // Coverage-ignore-block(suite): Not run.
         patternGuard.guard = (rewrite as Expression?)?..parent = patternGuard;
       }
       if (analysisResult.guardType is DynamicType) {
@@ -4223,11 +4384,13 @@
 
     rewrite = popRewrite();
     if (!identical(patternGuard.pattern, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       patternGuard.pattern = (rewrite as Pattern)..parent = patternGuard;
     }
 
     rewrite = popRewrite();
     if (!identical(entry.expression, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       entry.expression = (rewrite as Expression)..parent = patternGuard;
     }
 
@@ -4267,6 +4430,7 @@
 
       Object? rewrite = popRewrite(NullValues.Expression);
       if (!identical(patternVariableDeclaration.pattern, rewrite)) {
+        // Coverage-ignore-block(suite): Not run.
         patternVariableDeclaration.pattern = (rewrite as Pattern)
           ..parent = patternVariableDeclaration;
       }
@@ -4302,6 +4466,7 @@
       } else {
         StatementInferenceResult variableResult = inferStatement(variable);
         if (variableResult.hasChanged) {
+          // Coverage-ignore-block(suite): Not run.
           if (variables == null) {
             variables = <VariableDeclaration>[];
             variables.addAll(entry.variables.sublist(0, index));
@@ -4313,12 +4478,15 @@
               variables.add(variable as VariableDeclaration);
             }
           }
-        } else if (variables != null) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (variables != null) {
           variables.add(variable);
         }
       }
     }
     if (variables != null) {
+      // Coverage-ignore-block(suite): Not run.
       entry.variables.clear();
       entry.variables.addAll(variables);
       setParents(variables, entry);
@@ -4388,6 +4556,7 @@
     entry.expressionEffects = result.expressionSideEffects;
     result.expressionSideEffects?.parent = entry;
     if (entry.problem != null) {
+      // Coverage-ignore-block(suite): Not run.
       ExpressionInferenceResult problemResult = inferExpression(
           entry.problem!, const UnknownType(),
           isVoidAllowed: true);
@@ -4627,7 +4796,9 @@
           mapType, typeParametersToInfer, typeContext,
           isConst: node.isConst,
           typeOperations: operations,
-          inferenceResultForTesting: dataForTesting?.typeInferenceResult,
+          inferenceResultForTesting: dataForTesting
+              // Coverage-ignore(suite): Not run.
+              ?.typeInferenceResult,
           treeNodeForTesting: node);
       inferredTypes = typeSchemaEnvironment.choosePreliminaryTypes(
           gatherer, typeParametersToInfer, null);
@@ -4703,7 +4874,9 @@
                 setType, typeParametersToInfer, typeContext,
                 isConst: node.isConst,
                 typeOperations: operations,
-                inferenceResultForTesting: dataForTesting?.typeInferenceResult,
+                inferenceResultForTesting: dataForTesting
+                    // Coverage-ignore(suite): Not run.
+                    ?.typeInferenceResult,
                 treeNodeForTesting: node);
         List<DartType> inferredTypesForSet = typeSchemaEnvironment
             .choosePreliminaryTypes(gatherer, typeParametersToInfer, null);
@@ -4752,6 +4925,7 @@
       inferredTypes = typeSchemaEnvironment.chooseFinalTypes(
           gatherer, typeParametersToInfer, inferredTypes!);
       if (dataForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         dataForTesting!.typeInferenceResult.inferredTypeArguments[node] =
             inferredTypes;
       }
@@ -4845,6 +5019,7 @@
       return new ExpressionInferenceResult(
           result.inferredType, result.applyResult(invocation));
     } else {
+      // Coverage-ignore-block(suite): Not run.
       // TODO(johnniwinther): Handle augmentation of field with inferred types.
       TypeInferenceEngine.resolveInferenceNode(member, hierarchyBuilder);
       Link<NullAwareGuard> nullAwareGuards = const Link<NullAwareGuard>();
@@ -5390,7 +5565,9 @@
   ExpressionInferenceResult visitSuperIndexSet(
       SuperIndexSet node, DartType typeContext) {
     ObjectAccessTarget indexSetTarget = thisType!.classNode.isMixinDeclaration
-        ? new ObjectAccessTarget.interfaceMember(thisType!, node.setter,
+        ?
+        // Coverage-ignore(suite): Not run.
+        new ObjectAccessTarget.interfaceMember(thisType!, node.setter,
             hasNonObjectMemberAccess: true)
         : new ObjectAccessTarget.superMember(thisType!, node.setter);
 
@@ -5428,7 +5605,9 @@
     // the type of the value parameter.
     DartType inferredType = valueResult.inferredType;
 
-    assert(indexSetTarget.isInstanceMember || indexSetTarget.isSuperMember,
+    assert(
+        indexSetTarget.isInstanceMember || indexSetTarget.isSuperMember,
+        // Coverage-ignore(suite): Not run.
         'Unexpected index set target $indexSetTarget.');
     instrumentation?.record(uriForInstrumentation, node.fileOffset, 'target',
         new InstrumentationValueForMember(node.setter));
@@ -6021,7 +6200,9 @@
 
   bool _isNull(Expression node) {
     return node is NullLiteral ||
-        node is ConstantExpression && node.constant is NullConstant;
+        node is ConstantExpression &&
+            // Coverage-ignore(suite): Not run.
+            node.constant is NullConstant;
   }
 
   /// Creates an equals expression of using [left] and [right] as operands.
@@ -6067,6 +6248,7 @@
         equalsTarget.isInstanceMember ||
             equalsTarget.isObjectMember ||
             equalsTarget.isNever,
+        // Coverage-ignore(suite): Not run.
         "Unexpected equals target $equalsTarget for "
         "$left ($leftType) == $right.");
     if (instrumentation != null && leftType == const DynamicType()) {
@@ -6218,10 +6400,12 @@
       case ObjectAccessTargetKind.instanceMember:
       case ObjectAccessTargetKind.objectMember:
       case ObjectAccessTargetKind.nullableInstanceMember:
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.superMember:
         if ((binaryTarget.isInstanceMember || binaryTarget.isObjectMember) &&
             instrumentation != null &&
             leftType == const DynamicType()) {
+          // Coverage-ignore-block(suite): Not run.
           instrumentation!.record(uriForInstrumentation, fileOffset, 'target',
               new InstrumentationValueForMember(binaryTarget.member!));
         }
@@ -6251,6 +6435,7 @@
             ..fileOffset = fileOffset;
         }
         break;
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.recordIndexed:
       case ObjectAccessTargetKind.recordNamed:
       case ObjectAccessTargetKind.nullableRecordIndexed:
@@ -6264,6 +6449,7 @@
       List<LocatedMessage>? context = getWhyNotPromotedContext(
           whyNotPromoted?.call(),
           binary,
+          // Coverage-ignore(suite): Not run.
           (type) => !type.isPotentiallyNullable);
       return new ExpressionInferenceResult(
           binaryType,
@@ -6343,10 +6529,12 @@
       case ObjectAccessTargetKind.instanceMember:
       case ObjectAccessTargetKind.objectMember:
       case ObjectAccessTargetKind.nullableInstanceMember:
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.superMember:
         if ((unaryTarget.isInstanceMember || unaryTarget.isObjectMember) &&
             instrumentation != null &&
             expressionType == const DynamicType()) {
+          // Coverage-ignore-block(suite): Not run.
           instrumentation!.record(uriForInstrumentation, fileOffset, 'target',
               new InstrumentationValueForMember(unaryTarget.member!));
         }
@@ -6359,6 +6547,7 @@
           ..fileOffset = fileOffset;
 
         if (unaryCheckKind == MethodContravarianceCheckKind.checkMethodReturn) {
+          // Coverage-ignore-block(suite): Not run.
           if (instrumentation != null) {
             instrumentation!.record(uriForInstrumentation, fileOffset,
                 'checkReturn', new InstrumentationValueForType(expressionType));
@@ -6369,6 +6558,7 @@
             ..fileOffset = fileOffset;
         }
         break;
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.recordIndexed:
       case ObjectAccessTargetKind.recordNamed:
       case ObjectAccessTargetKind.nullableRecordIndexed:
@@ -6380,7 +6570,9 @@
 
     if (unaryTarget.isNullable) {
       List<LocatedMessage>? context = getWhyNotPromotedContext(
-          whyNotPromoted(), unary, (type) => !type.isPotentiallyNullable);
+          whyNotPromoted(),
+          unary, // Coverage-ignore(suite): Not run.
+          (type) => !type.isPotentiallyNullable);
       // TODO(johnniwinther): Special case 'unary-' in messages. It should
       // probably be referred to as "Unary operator '-' ...".
       return new ExpressionInferenceResult(
@@ -6390,7 +6582,11 @@
               templateNullableOperatorCallError.withArguments(
                   unaryName.text, expressionType),
               unary.fileOffset,
-              unaryName == unaryMinusName ? 1 : unaryName.text.length,
+              unaryName == unaryMinusName
+                  ? 1
+                  :
+                  // Coverage-ignore(suite): Not run.
+                  unaryName.text.length,
               context: context));
     }
     return new ExpressionInferenceResult(unaryType, unary);
@@ -6473,6 +6669,7 @@
       case ObjectAccessTargetKind.instanceMember:
       case ObjectAccessTargetKind.objectMember:
       case ObjectAccessTargetKind.nullableInstanceMember:
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.superMember:
         InstanceAccessKind kind;
         switch (readTarget.kind) {
@@ -6482,9 +6679,11 @@
           case ObjectAccessTargetKind.nullableInstanceMember:
             kind = InstanceAccessKind.Nullable;
             break;
+          // Coverage-ignore(suite): Not run.
           case ObjectAccessTargetKind.objectMember:
             kind = InstanceAccessKind.Object;
             break;
+          // Coverage-ignore(suite): Not run.
           default:
             throw new UnsupportedError('Unexpected target kind $readTarget');
         }
@@ -6511,6 +6710,7 @@
             ..fileOffset = fileOffset;
         }
         break;
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.recordIndexed:
       case ObjectAccessTargetKind.recordNamed:
       case ObjectAccessTargetKind.nullableRecordIndexed:
@@ -6601,6 +6801,7 @@
       case ObjectAccessTargetKind.instanceMember:
       case ObjectAccessTargetKind.objectMember:
       case ObjectAccessTargetKind.nullableInstanceMember:
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.superMember:
         InstanceAccessKind kind;
         switch (writeTarget.kind) {
@@ -6610,9 +6811,11 @@
           case ObjectAccessTargetKind.nullableInstanceMember:
             kind = InstanceAccessKind.Nullable;
             break;
+          // Coverage-ignore(suite): Not run.
           case ObjectAccessTargetKind.objectMember:
             kind = InstanceAccessKind.Object;
             break;
+          // Coverage-ignore(suite): Not run.
           default:
             throw new UnsupportedError('Unexpected target kind $writeTarget');
         }
@@ -6623,6 +6826,7 @@
             interfaceTarget: writeTarget.classMember as Procedure)
           ..fileOffset = fileOffset;
         break;
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.recordIndexed:
       case ObjectAccessTargetKind.recordNamed:
       case ObjectAccessTargetKind.nullableRecordIndexed:
@@ -6776,6 +6980,7 @@
       case ObjectAccessTargetKind.instanceMember:
       case ObjectAccessTargetKind.objectMember:
       case ObjectAccessTargetKind.nullableInstanceMember:
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.superMember:
         InstanceAccessKind kind;
         switch (writeTarget.kind) {
@@ -6785,9 +6990,11 @@
           case ObjectAccessTargetKind.nullableInstanceMember:
             kind = InstanceAccessKind.Nullable;
             break;
+          // Coverage-ignore(suite): Not run.
           case ObjectAccessTargetKind.objectMember:
             kind = InstanceAccessKind.Object;
             break;
+          // Coverage-ignore(suite): Not run.
           default:
             throw new UnsupportedError('Unexpected target kind $writeTarget');
         }
@@ -6795,6 +7002,7 @@
             interfaceTarget: writeTarget.classMember!)
           ..fileOffset = fileOffset;
         break;
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.recordIndexed:
       case ObjectAccessTargetKind.recordNamed:
       case ObjectAccessTargetKind.extensionTypeRepresentation:
@@ -7483,6 +7691,7 @@
         isSetter: true, instrumented: true, includeExtensionMethods: true);
     if (target.isInstanceMember || target.isObjectMember) {
       if (instrumentation != null && receiverType == const DynamicType()) {
+        // Coverage-ignore-block(suite): Not run.
         instrumentation!.record(uriForInstrumentation, node.fileOffset,
             'target', new InstrumentationValueForMember(target.member!));
       }
@@ -7515,8 +7724,11 @@
       ObjectAccessTarget target = new ObjectAccessTarget.interfaceMember(
           thisType!, member,
           hasNonObjectMemberAccess: true);
-      if (target.isInstanceMember || target.isObjectMember) {
+      if (target.isInstanceMember ||
+          // Coverage-ignore(suite): Not run.
+          target.isObjectMember) {
         if (instrumentation != null && receiverType == const DynamicType()) {
+          // Coverage-ignore-block(suite): Not run.
           instrumentation!.record(uriForInstrumentation, node.fileOffset,
               'target', new InstrumentationValueForMember(target.member!));
         }
@@ -7684,6 +7896,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitRecordIndexGet(
       RecordIndexGet node, DartType typeContext) {
     ExpressionInferenceResult result =
@@ -7720,6 +7933,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitRecordNameGet(
       RecordNameGet node, DartType typeContext) {
     ExpressionInferenceResult result =
@@ -7926,7 +8140,9 @@
           setType, typeParametersToInfer, typeContext,
           isConst: node.isConst,
           typeOperations: operations,
-          inferenceResultForTesting: dataForTesting?.typeInferenceResult,
+          inferenceResultForTesting: dataForTesting
+              // Coverage-ignore(suite): Not run.
+              ?.typeInferenceResult,
           treeNodeForTesting: node);
       inferredTypes = typeSchemaEnvironment.choosePreliminaryTypes(
           gatherer, typeParametersToInfer, null);
@@ -7950,6 +8166,7 @@
       inferredTypes = typeSchemaEnvironment.chooseFinalTypes(
           gatherer, typeParametersToInfer, inferredTypes!);
       if (dataForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         dataForTesting!.typeInferenceResult.inferredTypeArguments[node] =
             inferredTypes;
       }
@@ -8045,6 +8262,7 @@
     DartType type = target.getterType;
 
     if (target is Procedure && target.kind == ProcedureKind.Method) {
+      // Coverage-ignore-block(suite): Not run.
       Expression tearOff = new StaticTearOff(node.target as Procedure)
         ..fileOffset = node.fileOffset;
       return instantiateTearOff(type, typeContext, tearOff);
@@ -8117,6 +8335,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitAbstractSuperMethodInvocation(
       AbstractSuperMethodInvocation node, DartType typeContext) {
     instrumentation?.record(uriForInstrumentation, node.fileOffset, 'target',
@@ -8135,6 +8354,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitAbstractSuperPropertyGet(
       AbstractSuperPropertyGet node, DartType typeContext) {
     instrumentation?.record(uriForInstrumentation, node.fileOffset, 'target',
@@ -8153,6 +8373,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitAbstractSuperPropertySet(
       AbstractSuperPropertySet node, DartType typeContext) {
     ObjectAccessTarget writeTarget = new ObjectAccessTarget.interfaceMember(
@@ -8287,6 +8508,7 @@
 
     Object? rewrite = popRewrite();
     if (!identical(expression, rewrite)) {
+      // Coverage-ignore-block(suite): Not run.
       expression = rewrite as Expression;
       node.expression = expression..parent = node;
     }
@@ -8295,6 +8517,7 @@
     if (analysisResult.isExhaustive &&
         !analysisResult.hasDefault &&
         shouldThrowUnsoundnessException) {
+      // Coverage-ignore-block(suite): Not run.
       if (!analysisResult.lastCaseTerminates) {
         LabeledStatement breakTarget;
         if (node.parent is LabeledStatement) {
@@ -8324,6 +8547,7 @@
 
     assert(checkStack(node, stackBase, [/*empty*/]));
 
+    // Coverage-ignore(suite): Not run.
     return replacement != null
         ? new StatementInferenceResult.single(replacement)
         : const StatementInferenceResult();
@@ -8351,6 +8575,7 @@
     for (int i = node.cases.length - 1; i >= 0; i--) {
       Object? rewrite = popRewrite();
       if (!identical(rewrite, node.cases[i])) {
+        // Coverage-ignore-block(suite): Not run.
         node.cases[i] = (rewrite as PatternSwitchCase)..parent = node;
       }
     }
@@ -8422,6 +8647,7 @@
                   templateJointPatternVariablesMismatch
                       .withArguments(jointVariable.name!),
                   switchCase.jointVariableFirstUseOffsets?[i] ??
+                      // Coverage-ignore(suite): Not run.
                       jointVariable.fileOffset,
                   noLength)
                 ..parent = jointVariable;
@@ -8479,6 +8705,7 @@
   void visitCatch(Catch node) {
     StatementInferenceResult bodyResult = inferStatement(node.body);
     if (bodyResult.hasChanged) {
+      // Coverage-ignore-block(suite): Not run.
       node.body = bodyResult.statement..parent = node;
     }
   }
@@ -8527,11 +8754,15 @@
       result = new TryFinally(
           result,
           finalizerResult!.hasChanged
-              ? finalizerResult.statement
+              ?
+              // Coverage-ignore(suite): Not run.
+              finalizerResult.statement
               : node.finallyBlock!)
         ..fileOffset = node.fileOffset;
     }
-    libraryBuilder.loader.dataForTesting?.registerAlias(node, result);
+    libraryBuilder.loader.dataForTesting
+        // Coverage-ignore(suite): Not run.
+        ?.registerAlias(node, result);
     _inTryOrLocalFunction = oldInTryOrLocalFunction;
     return new StatementInferenceResult.single(result);
   }
@@ -8633,6 +8864,7 @@
       instrumentation?.record(uriForInstrumentation, node.fileOffset, 'type',
           new InstrumentationValueForType(inferredType));
       if (dataForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         dataForTesting!.typeInferenceResult.inferredVariableTypes[node] =
             inferredType;
       }
@@ -8831,6 +9063,7 @@
   ExpressionInferenceResult visitVariableGet(
       VariableGet node, DartType typeContext) {
     if (node is! VariableGetImpl) {
+      // Coverage-ignore-block(suite): Not run.
       // This node is created as part of a lowering and doesn't need inference.
       return new ExpressionInferenceResult(
           node.promotedType ?? node.variable.type, node);
@@ -8873,11 +9106,19 @@
 
     bool isUnassigned = !flowAnalysis.isAssigned(variable);
     if (isUnassigned) {
-      dataForTesting?.flowAnalysisResult.potentiallyUnassignedNodes.add(node);
+      dataForTesting
+          // Coverage-ignore(suite): Not run.
+          ?.flowAnalysisResult // Coverage-ignore(suite): Not run.
+          .potentiallyUnassignedNodes // Coverage-ignore(suite): Not run.
+          .add(node);
     }
     bool isDefinitelyUnassigned = flowAnalysis.isUnassigned(variable);
     if (isDefinitelyUnassigned) {
-      dataForTesting?.flowAnalysisResult.definitelyUnassignedNodes.add(node);
+      dataForTesting
+          // Coverage-ignore(suite): Not run.
+          ?.flowAnalysisResult // Coverage-ignore(suite): Not run.
+          .definitelyUnassignedNodes // Coverage-ignore(suite): Not run.
+          .add(node);
     }
     // Synthetic variables, local functions, and variables with
     // invalid types aren't checked.
@@ -8898,6 +9139,7 @@
       } else {
         if (isUnassigned) {
           if (variable.isFinal) {
+            // Coverage-ignore-block(suite): Not run.
             return new ExpressionInferenceResult(
                 resultType,
                 helper.wrapInProblem(
@@ -8935,6 +9177,7 @@
     flowAnalysis.whileStatement_bodyBegin(node, node.condition);
     StatementInferenceResult bodyResult = inferStatement(node.body);
     if (bodyResult.hasChanged) {
+      // Coverage-ignore-block(suite): Not run.
       node.body = bodyResult.statement..parent = node;
     }
     flowAnalysis.whileStatement_end();
@@ -8986,6 +9229,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitCheckLibraryIsLoaded(
       CheckLibraryIsLoaded node, DartType typeContext) {
     // TODO(cstefantsova): Figure out the suitable nullability for that.
@@ -9046,6 +9290,7 @@
         Expression? error = checkWebIntLiteralsErrorIfUnexact(
             receiver.value, receiver.literal, receiver.fileOffset);
         if (error != null) {
+          // Coverage-ignore-block(suite): Not run.
           return new ExpressionInferenceResult(const DynamicType(), error);
         }
       } else if (node.expression is ShadowLargeIntLiteral) {
@@ -9053,6 +9298,7 @@
             node.expression as ShadowLargeIntLiteral;
         if (!receiver.isParenthesized) {
           if (isDoubleContext(typeContext)) {
+            // Coverage-ignore-block(suite): Not run.
             double? doubleValue = receiver.asDouble(negated: true);
             if (doubleValue != null) {
               Expression replacement = new DoubleLiteral(doubleValue)
@@ -9064,6 +9310,7 @@
           }
           int? intValue = receiver.asInt64(negated: true);
           if (intValue == null) {
+            // Coverage-ignore-block(suite): Not run.
             Expression error = helper.buildProblem(
                 templateIntegerLiteralIsOutOfRange
                     .withArguments(receiver.literal),
@@ -9074,6 +9321,7 @@
           Expression? error = checkWebIntLiteralsErrorIfUnexact(
               intValue, receiver.literal, receiver.fileOffset);
           if (error != null) {
+            // Coverage-ignore-block(suite): Not run.
             return new ExpressionInferenceResult(const DynamicType(), error);
           }
           expressionResult = new ExpressionInferenceResult(
@@ -9312,12 +9560,15 @@
   Object? popRewrite([NullValue? nullValue]) {
     Object entry = _rewriteStack.removeLast();
     if (_debugRewriteStack) {
+      // Coverage-ignore-block(suite): Not run.
       assert(_debugPrint('POP ${entry.runtimeType} $entry'));
     }
     if (entry is! NullValue) {
       return entry;
     }
-    assert(nullValue == entry,
+    assert(
+        nullValue == entry,
+        // Coverage-ignore(suite): Not run.
         "Unexpected null value. Expected ${nullValue}, actual $entry");
     return null;
   }
@@ -9325,11 +9576,13 @@
   /// Pushes an entry onto [_rewriteStack].
   void pushRewrite(Object node) {
     if (_debugRewriteStack) {
+      // Coverage-ignore-block(suite): Not run.
       assert(_debugPrint('PUSH ${node.runtimeType} $node'));
     }
     _rewriteStack.add(node);
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Helper function used to print information to the console in debug mode.
   /// This method returns `true` so that it can be conveniently called inside of
   /// an `assert` statement.
@@ -9418,11 +9671,16 @@
           elementType: node.typeArgument, elements: node.patterns);
     } else if (node is MapPattern) {
       return analyzeMapPatternSchema(
-          typeArguments: node.keyType != null && node.valueType != null
-              ? (keyType: node.keyType!, valueType: node.valueType!)
+          typeArguments: node.keyType != null &&
+                  // Coverage-ignore(suite): Not run.
+                  node.valueType != null
+              ?
+              // Coverage-ignore(suite): Not run.
+              (keyType: node.keyType!, valueType: node.valueType!)
               : null,
           elements: node.entries);
     } else if (node is NamedPattern) {
+      // Coverage-ignore-block(suite): Not run.
       return dispatchPatternSchema(node.pattern);
     } else if (node is NullAssertPattern) {
       return analyzeNullCheckOrAssertPatternSchema(node.pattern,
@@ -9433,6 +9691,7 @@
     } else if (node is ObjectPattern) {
       return analyzeObjectPatternSchema(node.requiredType);
     } else if (node is OrPattern) {
+      // Coverage-ignore-block(suite): Not run.
       return analyzeLogicalOrPatternSchema(node.left, node.right);
     } else if (node is RecordPattern) {
       return analyzeRecordPatternSchema(
@@ -9446,6 +9705,7 @@
                     node: element, name: null, pattern: element)
           ]);
     } else if (node is RelationalPattern) {
+      // Coverage-ignore-block(suite): Not run.
       return analyzeRelationalPatternSchema();
     } else if (node is RestPattern) {
       // This pattern can't appear on it's own.
@@ -9457,6 +9717,7 @@
     } else if (node is InvalidPattern) {
       return const InvalidType();
     } else {
+      // Coverage-ignore-block(suite): Not run.
       return problems.unhandled("${node.runtimeType}", "dispatchPatternSchema",
           node is TreeNode ? node.fileOffset : TreeNode.noOffset, helper.uri);
     }
@@ -9518,6 +9779,7 @@
         body.statements.add(syntheticBreak);
         syntheticBreak.parent = body;
       } else {
+        // Coverage-ignore-block(suite): Not run.
         body = new Block([body, syntheticBreak])..fileOffset = body.fileOffset;
         case_.body = body..parent = case_;
       }
@@ -9534,6 +9796,7 @@
           popRewrite(); // CaseHead
         }
       } else {
+        // Coverage-ignore-block(suite): Not run.
         popRewrite(); // CaseHead
       }
     } else {
@@ -9547,6 +9810,7 @@
           popRewrite(); // CaseHead
         }
       } else {
+        // Coverage-ignore-block(suite): Not run.
         popRewrite(); // CaseHead
       }
     }
@@ -9836,6 +10100,7 @@
     InvalidExpression? error =
         analysisResult.patternTypeMismatchInIrrefutableContextError;
     if (error != null) {
+      // Coverage-ignore-block(suite): Not run.
       replacement =
           new InvalidPattern(error, declaredVariables: node.declaredVariables)
             ..fileOffset = error.fileOffset;
@@ -9871,6 +10136,7 @@
     InvalidExpression? error =
         analysisResult.patternTypeMismatchInIrrefutableContextError;
     if (error != null) {
+      // Coverage-ignore-block(suite): Not run.
       replacement =
           new InvalidPattern(error, declaredVariables: node.declaredVariables)
             ..fileOffset = error.fileOffset;
@@ -9949,11 +10215,13 @@
 
     Object? rewrite = popRewrite();
     if (!identical(rewrite, node.right)) {
+      // Coverage-ignore-block(suite): Not run.
       node.right = (rewrite as Pattern)..parent = node;
     }
 
     rewrite = popRewrite();
     if (!identical(rewrite, node.left)) {
+      // Coverage-ignore-block(suite): Not run.
       node.left = (rewrite as Pattern)..parent = node;
     }
 
@@ -9984,6 +10252,7 @@
     InvalidExpression? error =
         analysisResult.refutablePatternInIrrefutableContextError;
     if (error != null) {
+      // Coverage-ignore-block(suite): Not run.
       replacement =
           new InvalidPattern(error, declaredVariables: node.declaredVariables)
             ..fileOffset = error.fileOffset;
@@ -9991,11 +10260,13 @@
 
     Object? rewrite = popRewrite();
     if (!identical(rewrite, node.right)) {
+      // Coverage-ignore-block(suite): Not run.
       node.right = (rewrite as Pattern)..parent = node;
     }
 
     rewrite = popRewrite();
     if (!identical(rewrite, node.left)) {
+      // Coverage-ignore-block(suite): Not run.
       node.left = (rewrite as Pattern)..parent = node;
     }
 
@@ -10055,6 +10326,7 @@
 
     Object? rewrite = popRewrite();
     if (!identical(rewrite, node.pattern)) {
+      // Coverage-ignore-block(suite): Not run.
       node.pattern = (rewrite as Pattern)..parent = node;
     }
 
@@ -10085,6 +10357,7 @@
     InvalidExpression? error =
         analysisResult.refutablePatternInIrrefutableContextError;
     if (error != null) {
+      // Coverage-ignore-block(suite): Not run.
       replacement =
           new InvalidPattern(error, declaredVariables: node.declaredVariables)
             ..fileOffset = error.fileOffset;
@@ -10092,6 +10365,7 @@
 
     Object? rewrite = popRewrite();
     if (!identical(rewrite, node.pattern)) {
+      // Coverage-ignore-block(suite): Not run.
       node.pattern = (rewrite as Pattern)..parent = node;
     }
 
@@ -10119,6 +10393,7 @@
 
     Object? rewrite = popRewrite();
     if (!identical(rewrite, node.pattern)) {
+      // Coverage-ignore-block(suite): Not run.
       node.pattern = (rewrite as Pattern)..parent = node;
     }
 
@@ -10243,6 +10518,7 @@
           lengthType, lessThanOrEqualsName, node.fileOffset,
           includeExtensionMethods: true, isSetter: false);
       assert(lessThanOrEqualsInvokeTarget.isInstanceMember ||
+          // Coverage-ignore(suite): Not run.
           lessThanOrEqualsInvokeTarget.isObjectMember);
 
       node.lengthCheckTarget =
@@ -10253,6 +10529,7 @@
           lengthType, equalsName, node.fileOffset,
           includeExtensionMethods: true, isSetter: false);
       assert(equalsInvokeTarget.isInstanceMember ||
+          // Coverage-ignore(suite): Not run.
           equalsInvokeTarget.isObjectMember);
 
       node.lengthCheckTarget = equalsInvokeTarget.classMember as Procedure;
@@ -10310,6 +10587,7 @@
     InvalidExpression? error =
         analysisResult.patternTypeMismatchInIrrefutableContextError;
     if (error != null) {
+      // Coverage-ignore-block(suite): Not run.
       replacement =
           new InvalidPattern(error, declaredVariables: node.declaredVariables)
             ..fileOffset = error.fileOffset;
@@ -10395,6 +10673,7 @@
           field.accessKind = ObjectAccessKind.Direct;
           field.resultType = fieldTarget.getGetterType(this);
         case ObjectAccessTargetKind.superMember:
+          // Coverage-ignore(suite): Not run.
           problems.unsupported(
               'Object field target $fieldTarget', node.fileOffset, helper.uri);
         case ObjectAccessTargetKind.extensionMember:
@@ -10414,6 +10693,7 @@
         case ObjectAccessTargetKind.dynamic:
           field.accessKind = ObjectAccessKind.Dynamic;
           break;
+        // Coverage-ignore(suite): Not run.
         case ObjectAccessTargetKind.never:
           field.accessKind = ObjectAccessKind.Dynamic;
           break;
@@ -10567,6 +10847,7 @@
           case ObjectAccessTargetKind.nullableRecordNamed:
           case ObjectAccessTargetKind.extensionTypeRepresentation:
           case ObjectAccessTargetKind.nullableExtensionTypeRepresentation:
+            // Coverage-ignore(suite): Not run.
             problems.unsupported('Relational pattern target $invokeTarget',
                 node.fileOffset, helper.uri);
           case ObjectAccessTargetKind.extensionMember:
@@ -10622,6 +10903,7 @@
     InvalidExpression? error =
         analysisResult.patternTypeMismatchInIrrefutableContextError;
     if (error != null) {
+      // Coverage-ignore-block(suite): Not run.
       replacement =
           new InvalidPattern(error, declaredVariables: node.declaredVariables)
             ..fileOffset = error.fileOffset;
@@ -10673,6 +10955,7 @@
     for (int i = node.entries.length - 1; i >= 0; i--) {
       Object? rewrite = popRewrite();
       if (!identical(node.entries[i], rewrite)) {
+        // Coverage-ignore-block(suite): Not run.
         node.entries[i] = (rewrite as MapPatternEntry)..parent = node;
       }
     }
@@ -10762,6 +11045,7 @@
       if (resolvedType is RecordType) {
         node.lookupType = resolvedType;
       } else {
+        // Coverage-ignore-block(suite): Not run.
         // In case of the matched type being an invalid type we use the
         // required type instead.
         node.lookupType = requiredType;
@@ -10773,6 +11057,7 @@
       Object? rewrite = popRewrite();
       if (subPattern is NamedPattern) {
         if (!identical(rewrite, subPattern.pattern)) {
+          // Coverage-ignore-block(suite): Not run.
           subPattern.pattern = (rewrite as Pattern)..parent = subPattern;
         }
       } else {
@@ -10912,7 +11197,9 @@
         typeSchemaEnvironment.setupGenericTypeInference(
             declaredType, typeParametersToInfer, contextType,
             typeOperations: operations,
-            inferenceResultForTesting: dataForTesting?.typeInferenceResult,
+            inferenceResultForTesting: dataForTesting
+                // Coverage-ignore(suite): Not run.
+                ?.typeInferenceResult,
             treeNodeForTesting: treeNodeForTesting);
     return typeSchemaEnvironment.chooseFinalTypes(
         gatherer, typeParametersToInfer, null);
@@ -11027,6 +11314,7 @@
           context.offsets);
       pushRewrite(element);
     } else {
+      // Coverage-ignore-block(suite): Not run.
       problems.unsupported(
           "${element.runtimeType}", element.fileOffset, helper.uri);
     }
@@ -11091,6 +11379,7 @@
 
       Object? rewrite = popRewrite();
       if (!identical(rewrite, restPattern.subPattern)) {
+        // Coverage-ignore-block(suite): Not run.
         restPattern.subPattern = (rewrite as Pattern)..parent = restPattern;
       }
     } else {
@@ -11127,11 +11416,13 @@
       covariant MapPatternEntry entryElement, DartType keyType) {
     Object? rewrite = popRewrite();
     if (!identical(rewrite, entryElement.value)) {
+      // Coverage-ignore-block(suite): Not run.
       entryElement.value = rewrite as Pattern..parent = entryElement;
     }
 
     rewrite = popRewrite();
     if (!identical(rewrite, entryElement.key)) {
+      // Coverage-ignore-block(suite): Not run.
       entryElement.key = (rewrite as Expression)..parent = entryElement;
     }
 
@@ -11183,6 +11474,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   ExpressionInferenceResult visitAuxiliaryExpression(
       AuxiliaryExpression node, DartType typeContext) {
     return _unhandledExpression(node, typeContext);
@@ -11194,10 +11486,12 @@
     if (node is InternalInitializer) {
       return node.acceptInference(this);
     }
+    // Coverage-ignore(suite): Not run.
     return _unhandledInitializer(node);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   StatementInferenceResult visitAuxiliaryStatement(AuxiliaryStatement node) {
     return _unhandledStatement(node);
   }
diff --git a/pkg/front_end/lib/src/type_inference/inference_visitor_base.dart b/pkg/front_end/lib/src/type_inference/inference_visitor_base.dart
index 109a355..08c99f6 100644
--- a/pkg/front_end/lib/src/type_inference/inference_visitor_base.dart
+++ b/pkg/front_end/lib/src/type_inference/inference_visitor_base.dart
@@ -184,6 +184,7 @@
 
   DartType get bottomType => const NeverType.nonNullable();
 
+  // Coverage-ignore(suite): Not run.
   StaticTypeContext get staticTypeContext => _inferrer.staticTypeContext;
 
   DartType computeGreatestClosure(DartType type) {
@@ -201,6 +202,7 @@
     return cfeOperations.getNullableType(type);
   }
 
+  // Coverage-ignore(suite): Not run.
   Expression createReachabilityError(int fileOffset, Message errorMessage) {
     Arguments arguments = new Arguments([
       new StringLiteral(errorMessage.problemMessage)..fileOffset = fileOffset
@@ -223,6 +225,7 @@
       bool Function(DartType) typeFilter) {
     List<LocatedMessage>? context;
     if (whyNotPromoted != null && whyNotPromoted.isNotEmpty) {
+      // Coverage-ignore-block(suite): Not run.
       _WhyNotPromotedVisitor whyNotPromotedVisitor =
           new _WhyNotPromotedVisitor(this);
       for (MapEntry<DartType, NonPromotionReason> entry
@@ -280,6 +283,7 @@
 
   void registerIfUnreachableForTesting(TreeNode node, {bool? isReachable}) {
     if (dataForTesting == null) return;
+    // Coverage-ignore-block(suite): Not run.
     isReachable ??= flowAnalysis.isReachable;
     if (!isReachable) {
       dataForTesting!.flowAnalysisResult.unreachableNodes.add(node);
@@ -569,6 +573,7 @@
             expression, messageVoidExpression, expression.fileOffset, noLength);
         break;
       case AssignabilityKind.unassignablePrecise:
+        // Coverage-ignore(suite): Not run.
         // The type of the expression is known precisely, so an implicit
         // downcast is guaranteed to fail.  Insert a compile-time error.
         result = helper.wrapInProblem(
@@ -611,6 +616,7 @@
                 context: getWhyNotPromotedContext(
                     whyNotPromoted.call(),
                     expression,
+                    // Coverage-ignore(suite): Not run.
                     (type) => typeSchemaEnvironment.isSubtypeOf(type,
                         contextType, SubtypeCheckMode.withNullabilities)));
           }
@@ -768,6 +774,7 @@
             new Arguments([expression], types: target.receiverTypeArguments)
               ..fileOffset = fileOffset)
           ..fileOffset = fileOffset;
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.extensionTypeRepresentation:
       case ObjectAccessTargetKind.nullableInstanceMember:
       case ObjectAccessTargetKind.objectMember:
@@ -837,6 +844,7 @@
         case ObjectAccessTargetKind.callFunction:
         case ObjectAccessTargetKind.nullableCallFunction:
         case ObjectAccessTargetKind.extensionTypeRepresentation:
+        // Coverage-ignore(suite): Not run.
         case ObjectAccessTargetKind.nullableExtensionTypeRepresentation:
           shouldTearOff = false;
       }
@@ -893,6 +901,7 @@
       }
     }
     if (isExpressionTypePrecise) {
+      // Coverage-ignore-block(suite): Not run.
       // The type of the expression is known precisely, so an implicit
       // downcast is guaranteed to fail.  Insert a compile-time error.
       assert(implicitInstantiation == null);
@@ -948,7 +957,9 @@
     TypeConstraintGatherer gatherer = typeSchemaEnvironment
         .setupGenericTypeInference(null, typeParameters, null,
             typeOperations: cfeOperations,
-            inferenceResultForTesting: dataForTesting?.typeInferenceResult,
+            inferenceResultForTesting: dataForTesting
+                // Coverage-ignore(suite): Not run.
+                ?.typeInferenceResult,
             treeNodeForTesting: treeNodeForTesting);
     gatherer.constrainArguments([onType], [receiverType],
         treeNodeForTesting: treeNodeForTesting);
@@ -1093,6 +1104,7 @@
                   classMemberKind = ClassMemberKind.Getter;
                 case ProcedureKind.Setter:
                   classMemberKind = ClassMemberKind.Setter;
+                // Coverage-ignore(suite): Not run.
                 case ProcedureKind.Factory:
                 case null:
                   throw new UnsupportedError(
@@ -1116,6 +1128,7 @@
               isPlatform:
                   extensionBuilder.libraryBuilder.importUri.isScheme('dart'));
           if (noneMoreSpecific.isNotEmpty) {
+            // Coverage-ignore-block(suite): Not run.
             bool isMostSpecific = true;
             for (ExtensionAccessCandidate other in noneMoreSpecific) {
               bool? isMoreSpecific =
@@ -1212,6 +1225,7 @@
         } else if (receiverBound is ExtensionType &&
             name.text ==
                 receiverBound.extensionTypeDeclaration.representationName) {
+          // Coverage-ignore-block(suite): Not run.
           ObjectAccessTarget target =
               objectAccessDescriptor.findNonExtensionTarget(this);
           if (!target.isMissing) {
@@ -1295,7 +1309,9 @@
   DartType getGetterTypeForMemberTarget(
       Member interfaceMember, DartType receiverType,
       {required bool isSuper}) {
-    assert(interfaceMember is Field || interfaceMember is Procedure,
+    assert(
+        interfaceMember is Field || interfaceMember is Procedure,
+        // Coverage-ignore(suite): Not run.
         "Unexpected interface member $interfaceMember.");
     DartType calleeType =
         isSuper ? interfaceMember.superGetterType : interfaceMember.getterType;
@@ -1317,7 +1333,9 @@
   DartType getSetterTypeForMemberTarget(
       Member interfaceMember, DartType receiverType,
       {required bool isSuper}) {
-    assert(interfaceMember is Field || interfaceMember is Procedure,
+    assert(
+        interfaceMember is Field || interfaceMember is Procedure,
+        // Coverage-ignore(suite): Not run.
         "Unexpected interface member $interfaceMember.");
     DartType calleeType =
         isSuper ? interfaceMember.superSetterType : interfaceMember.setterType;
@@ -1620,7 +1638,9 @@
       gatherer = typeSchemaEnvironment.setupGenericTypeInference(
           calleeType.returnType, calleeTypeParameters, typeContext,
           typeOperations: cfeOperations,
-          inferenceResultForTesting: dataForTesting?.typeInferenceResult,
+          inferenceResultForTesting: dataForTesting
+              // Coverage-ignore(suite): Not run.
+              ?.typeInferenceResult,
           treeNodeForTesting: arguments);
       inferredTypes = typeSchemaEnvironment.choosePreliminaryTypes(
           gatherer, calleeTypeParameters, null);
@@ -1712,6 +1732,7 @@
       Object? argument = argumentsEvaluationOrder[evaluationOrderIndex];
       assert(
           argument is Expression || argument is NamedExpression,
+          // Coverage-ignore(suite): Not run.
           "Expected the argument to be either an Expression "
           "or a NamedExpression, got '${argument.runtimeType}'.");
       int index;
@@ -1827,10 +1848,12 @@
     }
     assert(
         positionalIndex == arguments.positional.length,
+        // Coverage-ignore(suite): Not run.
         "Expected 'positionalIndex' to be ${arguments.positional.length}, "
         "got ${positionalIndex}.");
     assert(
         namedIndex == arguments.named.length,
+        // Coverage-ignore(suite): Not run.
         "Expected 'namedIndex' to be ${arguments.named.length}, "
         "got ${namedIndex}.");
 
@@ -1897,9 +1920,13 @@
     if (inferenceNeeded) {
       inferredTypes = typeSchemaEnvironment.chooseFinalTypes(
           gatherer!, calleeTypeParameters, inferredTypes!);
-      assert(inferredTypes.every((type) => isKnown(type)),
+      assert(
+          inferredTypes.every((type) => isKnown(type)),
+          // Coverage-ignore(suite): Not run.
           "Unknown type(s) in inferred types: $inferredTypes.");
-      assert(inferredTypes.every((type) => !hasPromotedTypeVariable(type)),
+      assert(
+          inferredTypes.every((type) => !hasPromotedTypeVariable(type)),
+          // Coverage-ignore(suite): Not run.
           "Promoted type variable(s) in inferred types: $inferredTypes.");
       instantiator = new FunctionTypeInstantiator.fromIterables(
           calleeTypeParameters, inferredTypes);
@@ -1908,6 +1935,7 @@
       arguments.types.clear();
       arguments.types.addAll(inferredTypes);
       if (dataForTesting != null) {
+        // Coverage-ignore-block(suite): Not run.
         assert(arguments.fileOffset != TreeNode.noOffset);
         dataForTesting!.typeInferenceResult.inferredTypeArguments[arguments] =
             inferredTypes;
@@ -1987,6 +2015,7 @@
     inferredType = calleeType.returnType;
     assert(
         !containsFreeFunctionTypeVariables(inferredType),
+        // Coverage-ignore(suite): Not run.
         "Inferred return type $inferredType contains free variables. "
         "Inferred function type: $calleeType.");
 
@@ -2094,6 +2123,7 @@
         if (formalTypesFromContext[i] != null) {
           inferredType = computeGreatestClosure2(
               instantiator?.substitute(formalTypesFromContext[i]!) ??
+                  // Coverage-ignore(suite): Not run.
                   formalTypesFromContext[i]!);
           if (typeSchemaEnvironment.isSubtypeOf(inferredType, const NullType(),
               SubtypeCheckMode.withNullabilities)) {
@@ -2106,6 +2136,7 @@
             'type', new InstrumentationValueForType(inferredType));
         formal.type = demoteTypeInLibrary(inferredType);
         if (dataForTesting != null) {
+          // Coverage-ignore-block(suite): Not run.
           dataForTesting!.typeInferenceResult.inferredVariableTypes[formal] =
               formal.type;
         }
@@ -2355,6 +2386,7 @@
         List<LocatedMessage>? context = getWhyNotPromotedContext(
             flowAnalysis.whyNotPromoted(receiver)(),
             staticInvocation,
+            // Coverage-ignore(suite): Not run.
             (type) => !type.isPotentiallyNullable);
         result = wrapExpressionInferenceResultInProblem(
             result,
@@ -2383,6 +2415,7 @@
         List<LocatedMessage>? context = getWhyNotPromotedContext(
             flowAnalysis.whyNotPromoted(receiver)(),
             staticInvocation,
+            // Coverage-ignore(suite): Not run.
             (type) => !type.isPotentiallyNullable);
         if (isImplicitCall) {
           // Handles cases like:
@@ -2482,6 +2515,7 @@
       List<LocatedMessage>? context = getWhyNotPromotedContext(
           flowAnalysis.whyNotPromoted(receiver)(),
           expression,
+          // Coverage-ignore(suite): Not run.
           (type) => !type.isPotentiallyNullable);
       if (isImplicitCall) {
         // Handles cases like:
@@ -2540,7 +2574,9 @@
     Procedure? method = target.classMember as Procedure;
     assert(
         method.kind == ProcedureKind.Method ||
+            // Coverage-ignore(suite): Not run.
             method.kind == ProcedureKind.Operator,
+        // Coverage-ignore(suite): Not run.
         "Unexpected instance method $method");
     Name methodName = method.name;
 
@@ -2552,8 +2588,9 @@
         method = null;
       }
       for (NamedExpression argument in arguments.named) {
-        if (!signature.namedParameters
-            .any((declaration) => declaration.name == argument.name)) {
+        if (!signature.namedParameters.any(
+            // Coverage-ignore(suite): Not run.
+            (declaration) => declaration.name == argument.name)) {
           target = const ObjectAccessTarget.dynamic();
           method = null;
         }
@@ -2604,6 +2641,7 @@
       assert(
           inferredFunctionType is FunctionType &&
               !identical(unknownFunction, inferredFunctionType),
+          // Coverage-ignore(suite): Not run.
           "No function type found for $receiver.$methodName ($target) on "
           "$receiverType");
       InstanceAccessKind kind;
@@ -2617,6 +2655,7 @@
         case ObjectAccessTargetKind.objectMember:
           kind = InstanceAccessKind.Object;
           break;
+        // Coverage-ignore(suite): Not run.
         default:
           throw new UnsupportedError('Unexpected target kind $target');
       }
@@ -2650,6 +2689,7 @@
       List<LocatedMessage>? context = getWhyNotPromotedContext(
           flowAnalysis.whyNotPromoted(receiver)(),
           expression,
+          // Coverage-ignore(suite): Not run.
           (type) => !type.isPotentiallyNullable);
       if (isImplicitCall) {
         // Handles cases like:
@@ -2710,6 +2750,7 @@
         getter = null;
       }
       for (NamedExpression argument in arguments.named) {
+        // Coverage-ignore-block(suite): Not run.
         if (!signature.namedParameters
             .any((declaration) => declaration.name == argument.name)) {
           target = const ObjectAccessTarget.dynamic();
@@ -2746,6 +2787,7 @@
       case ObjectAccessTargetKind.objectMember:
         kind = InstanceAccessKind.Object;
         break;
+      // Coverage-ignore(suite): Not run.
       default:
         throw new UnsupportedError('Unexpected target kind $target');
     }
@@ -2758,6 +2800,7 @@
         receiver is! ThisExpression &&
         returnedTypeParametersOccurNonCovariantly(
             getter.enclosingTypeDeclaration!, getter.function.returnType)) {
+      // Coverage-ignore-block(suite): Not run.
       propertyGet = new AsExpression(propertyGet, calleeType)
         ..isTypeError = true
         ..isCovarianceCheck = true
@@ -2803,6 +2846,7 @@
       List<LocatedMessage>? context = getWhyNotPromotedContext(
           flowAnalysis.whyNotPromoted(receiver)(),
           invocationResult.expression,
+          // Coverage-ignore(suite): Not run.
           (type) => !type.isPotentiallyNullable);
       invocationResult = wrapExpressionInferenceResultInProblem(
           invocationResult,
@@ -2818,7 +2862,9 @@
       //  getter calls.
       Expression nullAwareAction = invocationResult.nullAwareAction;
       if (nullAwareAction is InstanceInvocation &&
+          // Coverage-ignore(suite): Not run.
           nullAwareAction.receiver == originalPropertyGet) {
+        // Coverage-ignore-block(suite): Not run.
         invocationResult = new ExpressionInferenceResult(
             invocationResult.inferredType,
             new InstanceGetterInvocation(originalPropertyGet.kind,
@@ -2924,9 +2970,11 @@
       case ObjectAccessTargetKind.nullableInstanceMember:
         kind = InstanceAccessKind.Nullable;
         break;
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.objectMember:
         kind = InstanceAccessKind.Object;
         break;
+      // Coverage-ignore(suite): Not run.
       default:
         throw new UnsupportedError('Unexpected target kind $target');
     }
@@ -3001,6 +3049,7 @@
       List<LocatedMessage>? context = getWhyNotPromotedContext(
           whyNotPromoted!(),
           invocationResult.expression,
+          // Coverage-ignore(suite): Not run.
           (type) => !type.isPotentiallyNullable);
       invocationResult = wrapExpressionInferenceResultInProblem(
           invocationResult,
@@ -3025,7 +3074,9 @@
                 functionType: nullAwareAction.functionType)
               ..fileOffset = nullAwareAction.fileOffset);
       } else if (nullAwareAction is DynamicInvocation &&
+          // Coverage-ignore(suite): Not run.
           nullAwareAction.receiver == originalPropertyGet) {
+        // Coverage-ignore-block(suite): Not run.
         invocationResult = new ExpressionInferenceResult(
             invocationResult.inferredType,
             new InstanceGetterInvocation(originalPropertyGet.kind, receiver,
@@ -3200,6 +3251,7 @@
           List<LocatedMessage>? context = getWhyNotPromotedContext(
               flowAnalysis.whyNotPromoted(receiver)(),
               receiver,
+              // Coverage-ignore(suite): Not run.
               (type) => !type.isPotentiallyNullable);
           readResult = wrapExpressionInferenceResultInProblem(
               readResult,
@@ -3239,6 +3291,7 @@
           List<LocatedMessage>? context = getWhyNotPromotedContext(
               flowAnalysis.whyNotPromoted(receiver)(),
               receiver,
+              // Coverage-ignore(suite): Not run.
               (type) => !type.isPotentiallyNullable);
           readResult = wrapExpressionInferenceResultInProblem(
               readResult,
@@ -3260,6 +3313,7 @@
             isImplicitCall: true,
             hoistedExpressions: hoistedExpressions);
       case ObjectAccessTargetKind.extensionTypeRepresentation:
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.nullableExtensionTypeRepresentation:
         DartType type = target.getGetterType(this);
         type = flowAnalysis.propertyGet(
@@ -3276,6 +3330,7 @@
         ExpressionInferenceResult readResult =
             new ExpressionInferenceResult(type, read);
         if (target.isNullable) {
+          // Coverage-ignore-block(suite): Not run.
           // Handles cases like:
           //
           //   extension type Foo(void Function() bar) {}
@@ -3326,6 +3381,7 @@
     Member? interfaceTarget;
     Name actualMethodName;
     if (calleeType is InterfaceType) {
+      // Coverage-ignore-block(suite): Not run.
       actualReceiverType = calleeType;
       interfaceTarget = null;
       actualMethodName = callName;
@@ -3421,6 +3477,7 @@
     DartType? promotedType = flowAnalysis.propertyGet(expression,
         SuperPropertyTarget.singleton, name.text, member, inferredType);
     if (promotedType != null) {
+      // Coverage-ignore-block(suite): Not run.
       expression = new AsExpression(expression, promotedType)
         ..isUnchecked = true
         ..fileOffset = expression.fileOffset;
@@ -3448,7 +3505,9 @@
             typeSchemaEnvironment.setupGenericTypeInference(
                 instantiatedType, typeParameters, context,
                 typeOperations: cfeOperations,
-                inferenceResultForTesting: dataForTesting?.typeInferenceResult,
+                inferenceResultForTesting: dataForTesting
+                    // Coverage-ignore(suite): Not run.
+                    ?.typeInferenceResult,
                 treeNodeForTesting: treeNodeForTesting);
         inferredTypes = typeSchemaEnvironment.chooseFinalTypes(
             gatherer, typeParameters, inferredTypes);
@@ -3573,6 +3632,7 @@
       if (interfaceMember is Field ||
           interfaceMember is Procedure &&
               interfaceMember.kind == ProcedureKind.Getter) {
+        // Coverage-ignore-block(suite): Not run.
         DartType getType = target.getGetterType(this);
         if (getType is DynamicType) {
           return MethodContravarianceCheckKind.none;
@@ -3632,6 +3692,7 @@
         // futureValueTypeSchema(_) = _.
         return node;
       }
+      // Coverage-ignore-block(suite): Not run.
       throw new UnsupportedError("Unsupported type '${node.runtimeType}'.");
     }), coreTypes);
   }
@@ -3695,6 +3756,7 @@
     if (expression is StaticGet) {
       Member target = expression.target;
       if (target is Procedure && target.kind == ProcedureKind.Method) {
+        // Coverage-ignore-block(suite): Not run.
         if (target.enclosingClass != null) {
           return templateInvalidCastStaticMethod;
         } else {
@@ -3840,6 +3902,7 @@
             fileOffset,
             implicitInvocationPropertyName.text.length);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         return helper.buildProblem(
             templateInvokeNonFunction
                 .withArguments(implicitInvocationPropertyName.text),
@@ -3875,8 +3938,10 @@
     Expression read;
     ExpressionInferenceResult? readResult;
 
+    // Coverage-ignore(suite): Not run.
     readTarget ??= findInterfaceMember(receiverType, propertyName, fileOffset,
         includeExtensionMethods: true, isSetter: false);
+    // Coverage-ignore(suite): Not run.
     readType ??= readTarget.getGetterType(this);
 
     switch (readTarget.kind) {
@@ -3913,6 +3978,7 @@
               ..fileOffset = fileOffset;
             readResult = instantiateTearOff(readType, typeContext, read);
             break;
+          // Coverage-ignore(suite): Not run.
           case ClassMemberKind.Setter:
             unhandled('$readTarget', "inferPropertyGet", -1, null);
         }
@@ -3956,6 +4022,7 @@
           case ObjectAccessTargetKind.objectMember:
             kind = InstanceAccessKind.Object;
             break;
+          // Coverage-ignore(suite): Not run.
           default:
             throw new UnsupportedError('Unexpected target kind $readTarget');
         }
@@ -4018,6 +4085,7 @@
           ..fileOffset = fileOffset;
         break;
       case ObjectAccessTargetKind.extensionTypeRepresentation:
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.nullableExtensionTypeRepresentation:
         read = new AsExpression(receiver, readType)
           ..isUnchecked = true
@@ -4042,7 +4110,9 @@
           propertyName.text.length,
           context: whyNotPromoted != null
               ? getWhyNotPromotedContext(
-                  whyNotPromoted(), read, (type) => !type.isPotentiallyNullable)
+                  whyNotPromoted(),
+                  read, // Coverage-ignore(suite): Not run.
+                  (type) => !type.isPotentiallyNullable)
               : null);
     }
     return new PropertyGetInferenceResult(readResult, readTarget.member);
@@ -4190,6 +4260,7 @@
     BigInt asInt = new BigInt.from(value).toUnsigned(64);
     BigInt asDouble = new BigInt.from(asInt.toDouble());
     if (asInt == asDouble) return null;
+    // Coverage-ignore-block(suite): Not run.
     String text = literal ?? value.toString();
     String nearest = text.startsWith('0x') || text.startsWith('0X')
         ? '0x${asDouble.toRadixString(16)}'
@@ -4264,6 +4335,7 @@
       typeParameters: functionType.typeParameters);
 }
 
+// Coverage-ignore(suite): Not run.
 class _WhyNotPromotedVisitor
     implements
         NonPromotionReasonVisitor<List<LocatedMessage>, Node,
@@ -4559,10 +4631,12 @@
             FunctionNode function = interfaceMember.function;
             assert(
                 function.namedParameters.isEmpty,
+                // Coverage-ignore(suite): Not run.
                 "Unexpected named parameters on $classNode member "
                 "$interfaceMember.");
             assert(
                 function.typeParameters.isEmpty,
+                // Coverage-ignore(suite): Not run.
                 "Unexpected type parameters on $classNode member "
                 "$interfaceMember.");
             functionType = new FunctionType(
@@ -4576,10 +4650,12 @@
             functionType: functionType,
           );
         case Nullability.nullable:
+        // Coverage-ignore(suite): Not run.
         case Nullability.legacy:
           // Never? and Never* are equivalent to Null.
           return visitor.findInterfaceMember(const NullType(), name, fileOffset,
               isSetter: isSetter);
+        // Coverage-ignore(suite): Not run.
         case Nullability.undetermined:
           return internalProblem(
               templateInternalProblemUnsupportedNullability.withArguments(
@@ -4710,6 +4786,7 @@
       case ObjectAccessTargetKind.nullableRecordIndexed:
       case ObjectAccessTargetKind.nullableRecordNamed:
       case ObjectAccessTargetKind.nullableExtensionTypeMember:
+      // Coverage-ignore(suite): Not run.
       case ObjectAccessTargetKind.nullableExtensionTypeRepresentation:
         return false;
     }
diff --git a/pkg/front_end/lib/src/type_inference/matching_cache.dart b/pkg/front_end/lib/src/type_inference/matching_cache.dart
index 50ab193..dfb2a0b 100644
--- a/pkg/front_end/lib/src/type_inference/matching_cache.dart
+++ b/pkg/front_end/lib/src/type_inference/matching_cache.dart
@@ -91,6 +91,7 @@
       if (jointVariable != null) {
         _variableAliases[variable] = jointVariable;
       } else {
+        // Coverage-ignore-block(suite): Not run.
         // Error case. This variable is only declared one of the branches and
         // therefore not joint. Include the variable in the declarations.
         registerDeclaration(variable);
@@ -145,7 +146,9 @@
     return _cacheKeyMap[cacheKey] = new Cache(
         cacheKey,
         this,
-        '${useVerboseEncodingForDebugging ? '${cacheKey.name}' : ''}'
+        '${useVerboseEncodingForDebugging ?
+            // Coverage-ignore(suite): Not run.
+            '${cacheKey.name}' : ''}'
         '#${this._matchingCacheIndex}'
         '#${_cachedExpressionIndex++}',
         isLate: isLate,
@@ -305,7 +308,9 @@
       required int fileOffset}) {
     CacheKey cacheKey;
     if (staticTarget != null) {
-      assert(typeArguments != null,
+      assert(
+          typeArguments != null,
+          // Coverage-ignore(suite): Not run.
           "No type arguments provided for static target $staticTarget.");
       cacheKey = new StaticAccessKey(
           receiver.cacheKey, staticTarget, typeArguments!, propertyName);
@@ -329,7 +334,9 @@
       required int fileOffset}) {
     CacheKey cacheKey;
     if (staticTarget != null) {
-      assert(typeArguments != null,
+      assert(
+          typeArguments != null,
+          // Coverage-ignore(suite): Not run.
           "No type arguments provided for static target $staticTarget.");
       cacheKey = new StaticAccessKey(left.cacheKey, staticTarget,
           typeArguments!, operator, [right.cacheKey]);
@@ -355,6 +362,7 @@
       required int fileOffset}) {
     CacheKey cacheKey;
     if (staticTarget != null) {
+      // Coverage-ignore-block(suite): Not run.
       assert(typeArguments != null,
           "No type arguments provided for static target $staticTarget.");
       cacheKey = new StaticAccessKey(left.cacheKey, staticTarget,
@@ -398,6 +406,7 @@
       required int fileOffset}) {
     CacheKey cacheKey;
     if (staticTarget != null) {
+      // Coverage-ignore-block(suite): Not run.
       assert(typeArguments != null,
           "No type arguments provided for static target $staticTarget.");
       cacheKey = new StaticAccessKey(receiver.cacheKey, staticTarget,
@@ -427,6 +436,7 @@
     const String propertyName = 'tail[]';
     CacheKey cacheKey;
     if (staticTarget != null) {
+      // Coverage-ignore-block(suite): Not run.
       assert(typeArguments != null,
           "No type arguments provided for static target $staticTarget.");
       cacheKey = new StaticAccessKey(receiver.cacheKey, staticTarget,
@@ -460,6 +470,7 @@
     const String propertyName = 'sublist[]';
     CacheKey cacheKey;
     if (staticTarget != null) {
+      // Coverage-ignore-block(suite): Not run.
       assert(typeArguments != null,
           "No type arguments provided for static target $staticTarget.");
       cacheKey = new StaticAccessKey(
@@ -490,6 +501,7 @@
       required int fileOffset}) {
     CacheKey cacheKey;
     if (staticTarget != null) {
+      // Coverage-ignore-block(suite): Not run.
       assert(typeArguments != null,
           "No type arguments provided for static target $staticTarget.");
       cacheKey = new StaticAccessKey(receiver.cacheKey, staticTarget,
@@ -516,6 +528,7 @@
       required int fileOffset}) {
     CacheKey cacheKey;
     if (staticTarget != null) {
+      // Coverage-ignore-block(suite): Not run.
       assert(typeArguments != null,
           "No type arguments provided for static target $staticTarget.");
       cacheKey = new StaticAccessKey(receiver.cacheKey, staticTarget,
@@ -567,6 +580,7 @@
   ExpressionKey(this.expression);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name => '${expression.toText(defaultAstTextStrategy)}';
 
   @override
@@ -586,6 +600,7 @@
   ConstantKey(this.constant);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name => '${constant.toText(defaultAstTextStrategy)}';
 
   @override
@@ -605,6 +620,7 @@
   IntegerKey(this.value);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name => '$value';
 
   @override
@@ -625,6 +641,7 @@
   IsKey(this.receiver, this.type);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name =>
       '${receiver.name}_is_${type.toText(defaultAstTextStrategy)}';
 
@@ -646,6 +663,7 @@
   AsKey(this.receiver, this.type);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name => '${receiver.name}_as_${type}';
 
   @override
@@ -665,6 +683,7 @@
   NullCheckKey(this.operand);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name => '${operand.name}?';
 
   @override
@@ -684,6 +703,7 @@
   NullAssertKey(this.operand);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name => '${operand.name}!';
 
   @override
@@ -706,6 +726,7 @@
   DynamicAccessKey(this.receiver, this.propertyName, [this.arguments]);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name {
     StringBuffer sb = new StringBuffer();
     sb.write('${receiver.name}_${propertyName}');
@@ -745,6 +766,7 @@
       [this.arguments]);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name {
     StringBuffer sb = new StringBuffer();
     sb.write('${receiver.name}_${target}_${typeArguments}');
@@ -784,6 +806,7 @@
   AndKey(this.left, this.right);
 
   @override
+  // Coverage-ignore(suite): Not run.
   String get name => '${left.name}_&&_${right.name}';
 
   @override
@@ -891,6 +914,7 @@
   @override
   CacheableExpression promote(DartType type) {
     if (type == _promotedType) return this;
+    // Coverage-ignore(suite): Not run.
     return new PromotedCacheableExpression(_expression, type);
   }
 }
@@ -910,6 +934,7 @@
       {required this.fileOffset});
 
   @override
+  // Coverage-ignore(suite): Not run.
   CacheKey get cacheKey => _expression.cacheKey;
 
   @override
@@ -938,12 +963,14 @@
 
   @override
   bool uses(DelayedExpression expression) {
+    // Coverage-ignore-block(suite): Not run.
     return identical(this, expression) || _expression.uses(expression);
   }
 
   @override
   CacheableExpression promote(DartType type) {
     if (type == _checkedType) return this;
+    // Coverage-ignore(suite): Not run.
     return new PromotedCacheableExpression(_expression, type);
   }
 }
@@ -1115,6 +1142,7 @@
             ..isLate = _isLate
             ..name = _name;
           if (_isLate) {
+            // Coverage-ignore-block(suite): Not run.
             // Avoid step debugging on the declaration of caching variables.
             // TODO(johnniwinther): Find a more systematic way of omitting
             // offsets for better step debugging.
@@ -1124,7 +1152,9 @@
         }
         result = createVariableGet(variable)..fileOffset = TreeNode.noOffset;
       } else {
-        assert(_isLate, "Unexpected non-late cache ${cacheKey.name}");
+        assert(
+            _isLate, // Coverage-ignore(suite): Not run.
+            "Unexpected non-late cache ${cacheKey.name}");
 
         VariableDeclaration? variable = _variable;
         VariableDeclaration? isSetVariable = _isSetVariable;
diff --git a/pkg/front_end/lib/src/type_inference/matching_expressions.dart b/pkg/front_end/lib/src/type_inference/matching_expressions.dart
index 2b49d1f..469d342 100644
--- a/pkg/front_end/lib/src/type_inference/matching_expressions.dart
+++ b/pkg/front_end/lib/src/type_inference/matching_expressions.dart
@@ -322,6 +322,7 @@
                 fileOffset: entry.fileOffset),
             fileOffset: entry.fileOffset);
       } else {
+        // Coverage-ignore-block(suite): Not run.
         matchingExpression = DelayedAndExpression.merge(
             matchingExpression, containsExpression,
             fileOffset: entry.fileOffset);
@@ -342,6 +343,7 @@
             fileOffset: node.fileOffset);
       }
     }
+    // Coverage-ignore(suite): Not run.
     return matchingExpression ??
         new BooleanExpression(true, fileOffset: node.fileOffset);
   }
@@ -432,6 +434,7 @@
               fileOffset: field.fileOffset);
           break;
         case ObjectAccessKind.Never:
+          // Coverage-ignore(suite): Not run.
           expression = new DelayedDynamicGet(
               typedMatchedExpression,
               field.fieldName,
@@ -550,6 +553,7 @@
           fileOffset: node.fileOffset);
     }
 
+    // Coverage-ignore(suite): Not run.
     return matchingExpression ??
         new BooleanExpression(true, fileOffset: node.fileOffset);
   }
@@ -662,6 +666,7 @@
     if (node.subPattern != null) {
       return visitPattern(node.subPattern!, matchedExpression);
     }
+    // Coverage-ignore-block(suite): Not run.
     throw new UnsupportedError("RestPattern without subpattern.");
   }
 
diff --git a/pkg/front_end/lib/src/type_inference/object_access_target.dart b/pkg/front_end/lib/src/type_inference/object_access_target.dart
index 970deac..631841c 100644
--- a/pkg/front_end/lib/src/type_inference/object_access_target.dart
+++ b/pkg/front_end/lib/src/type_inference/object_access_target.dart
@@ -179,19 +179,24 @@
       // TODO(johnniwinther): Unify stub kinds. Should we always make this a
       // member signature, merge member signature and abstract forwarding stub,
       // or add a new stub kind for abstract extension type members?
-      assert(member.enclosingExtensionTypeDeclaration != null,
+      assert(
+          member.enclosingExtensionTypeDeclaration != null,
+          // Coverage-ignore(suite): Not run.
           "Unexpected member without an enclosing class $member.");
       member = (member as Procedure).stubTarget!;
     }
     assert(
-        member.enclosingClass != null, "No enclosing class found on $member.");
+        member.enclosingClass != null, // Coverage-ignore(suite): Not run.
+        "No enclosing class found on $member.");
     return member;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// The access index, if this is an access to a positional record field.
   /// Otherwise null.
   int? get recordFieldIndex => null;
 
+  // Coverage-ignore(suite): Not run.
   /// The access name, if this is an access to a named record field.
   /// Otherwise null.
   String? get recordFieldName => null;
@@ -277,10 +282,12 @@
       isNullableExtensionTypeMember ||
       isNullableExtensionTypeRepresentation;
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the candidates for an ambiguous extension access.
   List<ExtensionAccessCandidate> get candidates =>
       throw new UnsupportedError('ObjectAccessTarget.candidates');
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the original procedure kind, if this is an extension method or
   /// extension type method target.
   ///
@@ -290,12 +297,14 @@
   ClassMemberKind get declarationMethodKind =>
       throw new UnsupportedError('ObjectAccessTarget.declarationMethodKind');
 
+  // Coverage-ignore(suite): Not run.
   /// Returns type arguments for the type parameters of an extension or
   /// extension type method that comes from the extension or extension type
   /// declaration. These are determined from the receiver of the access.
   List<DartType> get receiverTypeArguments =>
       throw new UnsupportedError('ObjectAccessTarget.receiverTypeArguments');
 
+  // Coverage-ignore(suite): Not run.
   /// Returns the member to use for a tearoff.
   ///
   /// This is currently used for extension methods.
@@ -371,6 +380,7 @@
   /// operand is of type `int` and `num` otherwise.
   bool isSpecialCasedBinaryOperator(InferenceVisitorBase base) => false;
 
+  // Coverage-ignore(suite): Not run.
   /// Returns `true` if this target is ternary operator, whose return type is
   /// specialized to take the operand type into account.
   ///
@@ -581,27 +591,32 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getSetterType(InferenceVisitorBase base) {
     assert(false, "Unexpected call to ${runtimeType}.getSetterType");
     return const DynamicType();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getIndexKeyType(InferenceVisitorBase base) {
     return const DynamicType();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getIndexSetValueType(InferenceVisitorBase base) {
     return const DynamicType();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getReturnType(InferenceVisitorBase base) {
     return getFunctionType(base).returnType;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getBinaryOperandType(InferenceVisitorBase base) {
     return const DynamicType();
   }
@@ -610,21 +625,25 @@
 class DynamicAccessTarget extends ObjectAccessTarget {
   /// Creates an access on a dynamic receiver type with no known target.
   const DynamicAccessTarget.dynamic()
-      : super.internal(ObjectAccessTargetKind.dynamic);
+      : super // Coverage-ignore(suite): Not run.
+        .internal(ObjectAccessTargetKind.dynamic);
 
   /// Creates an access with no target due to an invalid receiver type.
   ///
   /// This is not in itself an error but a consequence of another error.
   const DynamicAccessTarget.invalid()
-      : super.internal(ObjectAccessTargetKind.invalid);
+      : super // Coverage-ignore(suite): Not run.
+        .internal(ObjectAccessTargetKind.invalid);
 
   /// Creates an access with no target.
   ///
   /// This is an error case.
   const DynamicAccessTarget.missing()
-      : super.internal(ObjectAccessTargetKind.missing);
+      : super // Coverage-ignore(suite): Not run.
+        .internal(ObjectAccessTargetKind.missing);
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType? get receiverType => null;
 
   @override
@@ -679,11 +698,13 @@
       : super.internal(ObjectAccessTargetKind.never);
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType? get receiverType => null;
 
   @override
   FunctionType getFunctionType(InferenceVisitorBase base) {
-    return functionType ?? base.unknownFunction;
+    return functionType ?? // Coverage-ignore(suite): Not run.
+        base.unknownFunction;
   }
 
   @override
@@ -746,6 +767,7 @@
       case ClassMemberKind.Getter:
         // TODO(johnniwinther): Handle implicit .call on extension getter.
         return _getFunctionType(base, member.function!.returnType);
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Setter:
         throw unexpected('$this', 'getFunctionType', -1, null);
     }
@@ -786,6 +808,7 @@
                 extensionTypeParameters, receiverTypeArguments);
         DartType resultType = instantiator.substitute(functionType.returnType);
         return resultType;
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Setter:
         throw unexpected('$this', 'getGetterType', -1, null);
     }
@@ -807,6 +830,7 @@
         DartType setterType =
             instantiator.substitute(functionType.positionalParameters[1]);
         return setterType;
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Method:
       case ClassMemberKind.Getter:
         throw unexpected('$this', 'getSetterType', -1, null);
@@ -830,6 +854,7 @@
           return keyType;
         }
         return const InvalidType();
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
       case ClassMemberKind.Setter:
         throw unexpected('$this', 'getIndexKeyType', -1, null);
@@ -853,6 +878,7 @@
           return indexType;
         }
         return const InvalidType();
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
       case ClassMemberKind.Setter:
         throw unexpected('$this', 'getIndexSetValueType', -1, null);
@@ -863,6 +889,7 @@
   DartType getReturnType(InferenceVisitorBase base) {
     switch (declarationMethodKind) {
       case ClassMemberKind.Method:
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
         FunctionType functionType =
             member.function!.computeFunctionType(Nullability.nonNullable);
@@ -874,6 +901,7 @@
           returnType = instantiator.substitute(returnType);
         }
         return returnType;
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Setter:
         return const VoidType();
     }
@@ -888,6 +916,7 @@
         if (functionType.positionalParameters.length > 1) {
           DartType keyType = functionType.positionalParameters[1];
           if (functionType.typeParameters.isNotEmpty) {
+            // Coverage-ignore-block(suite): Not run.
             FunctionTypeInstantiator instantiator =
                 new FunctionTypeInstantiator.fromIterables(
                     functionType.typeParameters, receiverTypeArguments);
@@ -896,6 +925,7 @@
           return keyType;
         }
         return const InvalidType();
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
       case ClassMemberKind.Setter:
         return const InvalidType();
@@ -922,6 +952,7 @@
   Member? get member => null;
 
   @override
+  // Coverage-ignore(suite): Not run.
   FunctionType getFunctionType(InferenceVisitorBase base) {
     return base.unknownFunction;
   }
@@ -1002,7 +1033,9 @@
           return false;
         }
       }
-    } else if (other.isPlatform) {
+    }
+    // Coverage-ignore(suite): Not run.
+    else if (other.isPlatform) {
       // This is not platform, [other] is: this  is more specific.
       return true;
     } else {
@@ -1025,11 +1058,13 @@
       : super.internal(kind);
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getBinaryOperandType(InferenceVisitorBase base) {
     return const DynamicType();
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   FunctionType getFunctionType(InferenceVisitorBase base) {
     return _getFunctionType(base, getGetterType(base));
   }
@@ -1040,21 +1075,25 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getIndexKeyType(InferenceVisitorBase base) {
     throw unexpected(runtimeType.toString(), 'getIndexKeyType', -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getIndexSetValueType(InferenceVisitorBase base) {
     throw unexpected(runtimeType.toString(), 'getIndexSetValueType', -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getReturnType(InferenceVisitorBase base) {
     return getFunctionType(base).returnType;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getSetterType(InferenceVisitorBase base) {
     throw unexpected(runtimeType.toString(), 'getSetterType', -1, null);
   }
@@ -1120,9 +1159,11 @@
         FunctionType functionType =
             member.function!.computeFunctionType(Nullability.nonNullable);
         return functionType;
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
         // TODO(johnniwinther): Handle implicit .call on extension getter.
         return _getFunctionType(base, member.function!.returnType);
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Setter:
         throw unexpected('$this', 'getFunctionType', -1, null);
     }
@@ -1163,6 +1204,7 @@
                 extensionTypeParameters, receiverTypeArguments);
         DartType resultType = instantiator.substitute(functionType.returnType);
         return resultType;
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Setter:
         throw unexpected('$this', 'getGetterType', -1, null);
     }
@@ -1184,6 +1226,7 @@
         DartType setterType =
             instantiator.substitute(functionType.positionalParameters[1]);
         return setterType;
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Method:
       case ClassMemberKind.Getter:
         throw unexpected('$this', 'getSetterType', -1, null);
@@ -1207,6 +1250,7 @@
           return keyType;
         }
         return const InvalidType();
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
       case ClassMemberKind.Setter:
         throw unexpected('$this', 'getIndexKeyType', -1, null);
@@ -1230,6 +1274,7 @@
           return indexType;
         }
         return const InvalidType();
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
       case ClassMemberKind.Setter:
         throw unexpected('$this', 'getIndexSetValueType', -1, null);
@@ -1240,6 +1285,7 @@
   DartType getReturnType(InferenceVisitorBase base) {
     switch (declarationMethodKind) {
       case ClassMemberKind.Method:
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
         FunctionType functionType =
             member.function!.computeFunctionType(Nullability.nonNullable);
@@ -1251,6 +1297,7 @@
           returnType = instantiator.substitute(returnType);
         }
         return returnType;
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Setter:
         return const VoidType();
     }
@@ -1273,6 +1320,7 @@
           return keyType;
         }
         return const InvalidType();
+      // Coverage-ignore(suite): Not run.
       case ClassMemberKind.Getter:
       case ClassMemberKind.Setter:
         return const InvalidType();
@@ -1299,11 +1347,13 @@
             : ObjectAccessTargetKind.nullableExtensionTypeRepresentation);
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getBinaryOperandType(InferenceVisitorBase base) {
     throw unexpected('$this', 'getBinaryOperandType', -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   FunctionType getFunctionType(InferenceVisitorBase base) {
     return _getFunctionType(base, getGetterType(base));
   }
@@ -1315,21 +1365,25 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getIndexKeyType(InferenceVisitorBase base) {
     throw unexpected('$this', 'getIndexKeyType', -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getIndexSetValueType(InferenceVisitorBase base) {
     throw unexpected('$this', 'getIndexSetValueType', -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getReturnType(InferenceVisitorBase base) {
     throw unexpected('$this', 'getReturnType', -1, null);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getSetterType(InferenceVisitorBase base) {
     throw unexpected('$this', 'getSetterType', -1, null);
   }
diff --git a/pkg/front_end/lib/src/type_inference/shared_type_analyzer.dart b/pkg/front_end/lib/src/type_inference/shared_type_analyzer.dart
index 01c4fb7..4ab4768 100644
--- a/pkg/front_end/lib/src/type_inference/shared_type_analyzer.dart
+++ b/pkg/front_end/lib/src/type_inference/shared_type_analyzer.dart
@@ -46,7 +46,9 @@
         nullSafetyEnabled
             ? templateSwitchExpressionNotSubtype.withArguments(
                 caseExpressionType, scrutineeType)
-            : templateSwitchExpressionNotAssignable.withArguments(
+            :
+            // Coverage-ignore(suite): Not run.
+            templateSwitchExpressionNotAssignable.withArguments(
                 scrutineeType, caseExpressionType),
         caseExpression.fileOffset,
         noLength,
diff --git a/pkg/front_end/lib/src/type_inference/standard_bounds.dart b/pkg/front_end/lib/src/type_inference/standard_bounds.dart
index 84a2eff..da1b542 100644
--- a/pkg/front_end/lib/src/type_inference/standard_bounds.dart
+++ b/pkg/front_end/lib/src/type_inference/standard_bounds.dart
@@ -26,6 +26,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getNullabilityObliviousStandardLowerBoundInternal(type1, type2) {
     // For any type T, SLB(?, T) = SLB(T, ?) = T.
     if (type1 is UnknownType) {
@@ -54,6 +55,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType getNullabilityObliviousStandardUpperBoundInternal(
       DartType type1, DartType type2) {
     // For any type T, SUB(?, T) = SUB(T, ?) = T.
diff --git a/pkg/front_end/lib/src/type_inference/type_constraint_gatherer.dart b/pkg/front_end/lib/src/type_inference/type_constraint_gatherer.dart
index c717971..50465a9 100644
--- a/pkg/front_end/lib/src/type_inference/type_constraint_gatherer.dart
+++ b/pkg/front_end/lib/src/type_inference/type_constraint_gatherer.dart
@@ -53,6 +53,7 @@
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   Member? getInterfaceMember(Class class_, Name name, {bool setter = false}) {
     return _environment.hierarchy
         .getInterfaceMember(class_, name, setter: setter);
@@ -99,6 +100,7 @@
         constrainSupertype: false, treeNodeForTesting: treeNodeForTesting);
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Tries to match [subtype] against [supertype].
   ///
   /// If the match succeeds, the member returns true, and the resulting type
@@ -151,6 +153,7 @@
     GeneratedTypeConstraint generatedTypeConstraint =
         new GeneratedTypeConstraint.lower(parameter, lower);
     if (treeNodeForTesting != null && _inferenceResultForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       (_inferenceResultForTesting
               .generatedTypeConstraints[treeNodeForTesting] ??= [])
           .add(generatedTypeConstraint);
@@ -164,6 +167,7 @@
     GeneratedTypeConstraint generatedTypeConstraint =
         new GeneratedTypeConstraint.upper(parameter, upper);
     if (treeNodeForTesting != null && _inferenceResultForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       (_inferenceResultForTesting
               .generatedTypeConstraints[treeNodeForTesting] ??= [])
           .add(generatedTypeConstraint);
@@ -171,6 +175,7 @@
     _protoConstraints.add(generatedTypeConstraint);
   }
 
+  // Coverage-ignore(suite): Not run.
   bool _isFunctionSubtypeMatch(FunctionType subtype, FunctionType supertype,
       {required TreeNode? treeNodeForTesting}) {
     // A function type `(M0,..., Mn, [M{n+1}, ..., Mm]) -> R0` is a subtype
@@ -254,6 +259,7 @@
     return true;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Whether the [subtype] interface is a subtype of the [supertype] interface
   /// with respect to variance.
   bool _isNullabilityObliviousInterfaceSubtypeMatch(
@@ -338,7 +344,9 @@
                 unhandledTypeHandler: (DartType type, ignored) =>
                     type is UnknownType
                         ? false
-                        : throw new UnsupportedError(
+                        :
+                        // Coverage-ignore(suite): Not run.
+                        throw new UnsupportedError(
                             "Unsupported type '${type.runtimeType}'.")),
         "Failed implication check: "
         "constrainSupertype -> !containsTypeVariable(q)");
@@ -371,7 +379,9 @@
                 unhandledTypeHandler: (DartType type, ignored) =>
                     type is UnknownType
                         ? false
-                        : throw new UnsupportedError(
+                        :
+                        // Coverage-ignore(suite): Not run.
+                        throw new UnsupportedError(
                             "Unsupported type '${type.runtimeType}'.")),
         "Failed implication check: "
         "!constrainSupertype -> !containsTypeVariable(q)");
@@ -424,6 +434,7 @@
     //
     // Only if P0 is a subtype match for Q under constraint set C.
     if (pNullability == NullabilitySuffix.star) {
+      // Coverage-ignore-block(suite): Not run.
       return _isNullabilityAwareSubtypeMatch(
           typeOperations.withNullabilitySuffix(p, NullabilitySuffix.none), q,
           constrainSupertype: constrainSupertype,
@@ -437,6 +448,7 @@
     // Or if P is not dynamic or void and P is a subtype match for Q0? under
     // constraint set C.
     if (qNullability == NullabilitySuffix.star) {
+      // Coverage-ignore-block(suite): Not run.
       final int baseConstraintCount = _protoConstraints.length;
 
       if ((p is SharedDynamicType || p is SharedVoidType) &&
@@ -567,6 +579,7 @@
       if (_isNullabilityAwareSubtypeMatch(typeOperations.futureType(p0), q,
               constrainSupertype: constrainSupertype,
               treeNodeForTesting: treeNodeForTesting) &&
+          // Coverage-ignore(suite): Not run.
           _isNullabilityAwareSubtypeMatch(p0, q,
               constrainSupertype: constrainSupertype,
               treeNodeForTesting: treeNodeForTesting)) {
@@ -627,6 +640,7 @@
     // If B is a subtype match for Q with constraint set C.  Note that we have
     // already eliminated the case that X is a variable in L.
     if (p is TypeParameterType) {
+      // Coverage-ignore-block(suite): Not run.
       final int baseConstraintCount = _protoConstraints.length;
       if (_isNullabilityAwareSubtypeMatch(p.bound, q,
           constrainSupertype: constrainSupertype,
@@ -635,6 +649,7 @@
       }
       _protoConstraints.length = baseConstraintCount;
     } else if (p is StructuralParameterType) {
+      // Coverage-ignore-block(suite): Not run.
       final int baseConstraintCount = _protoConstraints.length;
       if (_isNullabilityAwareSubtypeMatch(p.bound, q,
           constrainSupertype: constrainSupertype,
@@ -730,6 +745,7 @@
                     treeNodeForTesting: treeNodeForTesting);
           }
           if (isMatch) return true;
+          // Coverage-ignore-block(suite): Not run.
           _protoConstraints.length = baseConstraintCount;
         }
 
@@ -741,6 +757,7 @@
     //
     // If P is a function type.
     if (typeOperations.isDartCoreFunction(q) &&
+        // Coverage-ignore(suite): Not run.
         typeOperations.isFunctionType(p)) {
       return true;
     }
@@ -775,6 +792,7 @@
         }
         if (isMatch) return true;
       }
+      // Coverage-ignore-block(suite): Not run.
       _protoConstraints.length = baseConstraintCount;
     }
 
@@ -787,14 +805,20 @@
         p.positionalParameters.length == p.requiredParameterCount &&
         q.positionalParameters.length == q.requiredParameterCount &&
         p.requiredParameterCount == q.requiredParameterCount &&
-        (p.namedParameters.isNotEmpty || q.namedParameters.isNotEmpty)) {
+        (p.namedParameters.isNotEmpty ||
+            // Coverage-ignore(suite): Not run.
+            q.namedParameters.isNotEmpty)) {
       final int baseConstraintCount = _protoConstraints.length;
 
       if (_isNullabilityAwareSubtypeMatch(p.returnType, q.returnType,
           constrainSupertype: constrainSupertype,
           treeNodeForTesting: treeNodeForTesting)) {
         bool isMatch = true;
-        for (int i = 0; isMatch && i < p.positionalParameters.length; ++i) {
+        for (int i = 0;
+            isMatch && i < p.positionalParameters.length;
+            // Coverage-ignore(suite): Not run.
+            ++i) {
+          // Coverage-ignore-block(suite): Not run.
           isMatch = isMatch &&
               _isNullabilityAwareSubtypeMatch(
                   q.positionalParameters[i], p.positionalParameters[i],
@@ -816,6 +840,7 @@
         }
         if (isMatch) return true;
       }
+      // Coverage-ignore-block(suite): Not run.
       _protoConstraints.length = baseConstraintCount;
     }
 
@@ -878,10 +903,13 @@
                   topType: typeOperations.objectQuestionType,
                   topFunctionType:
                       _environment.coreTypes.functionNonNullableRawType,
-                  unhandledTypeHandler: (DartType type, ignored) =>
-                      type is UnknownType
+                  unhandledTypeHandler:
+                      // Coverage-ignore(suite): Not run.
+                      (DartType type, ignored) => type is UnknownType
                           ? false
-                          : throw new UnsupportedError(
+                          :
+                          // Coverage-ignore(suite): Not run.
+                          throw new UnsupportedError(
                               "Unsupported type '${type.runtimeType}'."));
           for (GeneratedTypeConstraint constraint in constraints) {
             if (constraint.isUpper) {
@@ -897,6 +925,7 @@
           return true;
         }
       }
+      // Coverage-ignore-block(suite): Not run.
       _protoConstraints.length = baseConstraintCount;
     }
 
@@ -946,6 +975,7 @@
     return false;
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Attempts to match [subtype] as a subtype of [supertype], gathering any
   /// constraints discovered in the process.
   ///
@@ -1165,11 +1195,13 @@
     return false;
   }
 
+  // Coverage-ignore(suite): Not run.
   bool _isTop(DartType type) =>
       type is DynamicType ||
       type is VoidType ||
       type == _environment.coreTypes.objectLegacyRawType;
 
+  // Coverage-ignore(suite): Not run.
   /// Given two lists of function type formal parameters, checks that their
   /// bounds are compatible.
   ///
diff --git a/pkg/front_end/lib/src/type_inference/type_demotion.dart b/pkg/front_end/lib/src/type_inference/type_demotion.dart
index 060d536..34027f6 100644
--- a/pkg/front_end/lib/src/type_inference/type_demotion.dart
+++ b/pkg/front_end/lib/src/type_inference/type_demotion.dart
@@ -16,6 +16,7 @@
   const _HasPromotedTypeVariableVisitor();
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitIntersectionType(IntersectionType node) => true;
 }
 
diff --git a/pkg/front_end/lib/src/type_inference/type_inference_engine.dart b/pkg/front_end/lib/src/type_inference/type_inference_engine.dart
index a0e1174..900e5b8 100644
--- a/pkg/front_end/lib/src/type_inference/type_inference_engine.dart
+++ b/pkg/front_end/lib/src/type_inference/type_inference_engine.dart
@@ -116,6 +116,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitTypedefType(TypedefType node) {
     return node.unalias.accept(this);
   }
@@ -132,6 +133,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool visitIntersectionType(IntersectionType node) {
     return node.left.accept(this);
   }
@@ -352,6 +354,7 @@
       SourceLibraryBuilder library, InferenceDataForTesting? dataForTesting) {
     AssignedVariables<TreeNode, VariableDeclaration> assignedVariables;
     if (dataForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       assignedVariables = dataForTesting.flowAnalysisResult.assignedVariables =
           new AssignedVariablesForTesting<TreeNode, VariableDeclaration>();
     } else {
@@ -362,6 +365,7 @@
       return new TypeInferrerImpl(this, uri, false, thisType, library,
           assignedVariables, dataForTesting, unknownFunction);
     }
+    // Coverage-ignore(suite): Not run.
     return new TypeInferrerImplBenchmarked(this, uri, false, thisType, library,
         assignedVariables, dataForTesting, benchmarker!, unknownFunction);
   }
@@ -372,6 +376,7 @@
       SourceLibraryBuilder library, InferenceDataForTesting? dataForTesting) {
     AssignedVariables<TreeNode, VariableDeclaration> assignedVariables;
     if (dataForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       assignedVariables = dataForTesting.flowAnalysisResult.assignedVariables =
           new AssignedVariablesForTesting<TreeNode, VariableDeclaration>();
     } else {
@@ -382,6 +387,7 @@
       return new TypeInferrerImpl(this, uri, true, thisType, library,
           assignedVariables, dataForTesting, unknownFunction);
     }
+    // Coverage-ignore(suite): Not run.
     return new TypeInferrerImplBenchmarked(this, uri, true, thisType, library,
         assignedVariables, dataForTesting, benchmarker!, unknownFunction);
   }
@@ -457,6 +463,7 @@
       typeEnvironment.coreTypes.boolRawType(Nullability.nonNullable);
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get doubleType => throw new UnimplementedError('TODO(paulberry)');
 
   @override
@@ -466,6 +473,7 @@
   DartType get errorType => const InvalidType();
 
   @override
+  // Coverage-ignore(suite): Not run.
   DartType get intType => throw new UnimplementedError('TODO(paulberry)');
 
   @override
@@ -515,11 +523,13 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isExtensionType(DartType type) {
     return type is ExtensionType;
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isInterfaceType(DartType type) {
     return type is InterfaceType;
   }
@@ -535,6 +545,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isObject(DartType type) {
     return type is InterfaceType &&
         type.classNode == typeEnvironment.objectClass &&
@@ -688,6 +699,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isTypeSchemaSatisfied(
           {required DartType typeSchema, required DartType type}) =>
       isSubtypeOf(type, typeSchema);
@@ -863,17 +875,20 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool typeSchemaIsSubtypeOfTypeSchema(
       DartType leftSchema, DartType rightSchema) {
     return isSubtypeOf(leftSchema, rightSchema);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool typeIsSubtypeOfTypeSchema(DartType leftType, DartType rightSchema) {
     return isSubtypeOf(leftType, rightSchema);
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool typeSchemaIsSubtypeOfType(DartType leftSchema, DartType rightType) {
     return isSubtypeOf(leftSchema, rightType);
   }
@@ -883,14 +898,17 @@
     switch (modifier) {
       case NullabilitySuffix.none:
         return computeTypeWithoutNullabilityMarker(type);
+      // Coverage-ignore(suite): Not run.
       case NullabilitySuffix.question:
         return type.withDeclaredNullability(Nullability.nullable);
+      // Coverage-ignore(suite): Not run.
       case NullabilitySuffix.star:
         return type.withDeclaredNullability(Nullability.legacy);
     }
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeDeclarationKind? getTypeDeclarationKind(DartType type) {
     if (type is TypeDeclarationType) {
       switch (type) {
@@ -905,6 +923,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   TypeDeclarationKind? getTypeSchemaDeclarationKind(DartType typeSchema) {
     return getTypeDeclarationKind(typeSchema);
   }
diff --git a/pkg/front_end/lib/src/type_inference/type_inferrer.dart b/pkg/front_end/lib/src/type_inference/type_inferrer.dart
index 0e20fec..dfedd7b 100644
--- a/pkg/front_end/lib/src/type_inference/type_inferrer.dart
+++ b/pkg/front_end/lib/src/type_inference/type_inferrer.dart
@@ -182,6 +182,7 @@
     StatementInferenceResult result =
         visitor.inferStatement(body, closureContext);
     if (dataForTesting != null) {
+      // Coverage-ignore-block(suite): Not run.
       if (!flowAnalysis.isReachable) {
         dataForTesting!.flowAnalysisResult.functionBodiesThatDontComplete
             .add(body);
@@ -216,6 +217,7 @@
     List<NamedExpression> namedArguments = <NamedExpression>[];
     for (VariableDeclaration parameter
         in redirectingFactoryFunction.namedParameters) {
+      // Coverage-ignore-block(suite): Not run.
       flowAnalysis.declare(parameter, parameter.type, initialized: true);
       namedArguments.add(new NamedExpression(parameter.name!,
           new VariableGetImpl(parameter, forNullGuardedAccess: false)));
@@ -284,6 +286,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class TypeInferrerImplBenchmarked implements TypeInferrer {
   final TypeInferrerImpl impl;
   final Benchmarker benchmarker;
diff --git a/pkg/front_end/lib/src/type_inference/type_schema.dart b/pkg/front_end/lib/src/type_inference/type_schema.dart
index 793ff36..badca78 100644
--- a/pkg/front_end/lib/src/type_inference/type_schema.dart
+++ b/pkg/front_end/lib/src/type_inference/type_schema.dart
@@ -14,6 +14,7 @@
 /// Determines whether a type schema contains `?` somewhere inside it.
 bool isKnown(DartType schema) => !schema.accept(const _HasUnknownVisitor());
 
+// Coverage-ignore(suite): Not run.
 /// Converts a [DartType] to a string, representing the unknown type as `?`.
 String typeSchemaToString(DartType schema) {
   StringBuffer buffer = new StringBuffer();
@@ -22,6 +23,7 @@
   return '$buffer';
 }
 
+// Coverage-ignore(suite): Not run.
 /// Extension of [Printer] that represents the unknown type as `?`.
 class TypeSchemaPrinter extends Printer {
   TypeSchemaPrinter(StringSink sink,
@@ -54,6 +56,7 @@
   Nullability get declaredNullability => Nullability.undetermined;
 
   @override
+  // Coverage-ignore(suite): Not run.
   Nullability get nullability => Nullability.undetermined;
 
   @override
@@ -72,15 +75,18 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitChildren(Visitor<dynamic> v) {}
 
   @override
   UnknownType withDeclaredNullability(Nullability nullability) => this;
 
   @override
+  // Coverage-ignore(suite): Not run.
   UnknownType toNonNull() => this;
 
   @override
+  // Coverage-ignore(suite): Not run.
   void toTextInternal(AstPrinter printer) {
     printer.write('?');
   }
diff --git a/pkg/front_end/lib/src/type_inference/type_schema_elimination.dart b/pkg/front_end/lib/src/type_inference/type_schema_elimination.dart
index 65ac504..bb2da20 100644
--- a/pkg/front_end/lib/src/type_inference/type_schema_elimination.dart
+++ b/pkg/front_end/lib/src/type_inference/type_schema_elimination.dart
@@ -59,6 +59,7 @@
     if (node is UnknownType) {
       return isLeastClosure ? bottomType : topType;
     }
+    // Coverage-ignore-block(suite): Not run.
     throw new UnsupportedError(
         "Unsupported auxiliary type $node (${node.runtimeType}).");
   }
@@ -74,8 +75,9 @@
             topType.classNode.enclosingLibrary.importUri.isScheme("dart") &&
             topType.classNode.enclosingLibrary.importUri.path == "core" &&
             topType.classNode.name == "Object");
-    assert(
-        bottomType == const NeverType.nonNullable() || bottomType is NullType);
+    assert(bottomType == const NeverType.nonNullable() ||
+        // Coverage-ignore(suite): Not run.
+        bottomType is NullType);
     _TypeSchemaEliminationVisitor visitor =
         new _TypeSchemaEliminationVisitor(topType, bottomType);
     DartType? result = schema.accept1(
diff --git a/pkg/front_end/lib/src/type_inference/type_schema_environment.dart b/pkg/front_end/lib/src/type_inference/type_schema_environment.dart
index 5c10c74..b0c065b 100644
--- a/pkg/front_end/lib/src/type_inference/type_schema_environment.dart
+++ b/pkg/front_end/lib/src/type_inference/type_schema_environment.dart
@@ -277,6 +277,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   bool isTop(DartType t) {
     if (t is UnknownType) {
       return true;
@@ -336,6 +337,7 @@
       MergedTypeConstraint constraint, DartType topType, DartType bottomType,
       {bool grounded = false, bool isContravariant = false}) {
     assert(bottomType == const NeverType.nonNullable() ||
+        // Coverage-ignore(suite): Not run.
         bottomType == const NullType());
     if (!isContravariant) {
       // Prefer the known bound, if any.
@@ -358,6 +360,7 @@
     } else {
       // Prefer the known bound, if any.
       if (isKnown(constraint.upper)) {
+        // Coverage-ignore-block(suite): Not run.
         return constraint.upper;
       }
       if (isKnown(constraint.lower)) return constraint.lower;
@@ -365,19 +368,23 @@
       // Otherwise take whatever bound has partial information,
       // e.g. `Iterable<?>`
       if (constraint.upper is! UnknownType) {
+        // Coverage-ignore-block(suite): Not run.
         return grounded
             ? greatestClosure(constraint.upper, topType, bottomType)
             : constraint.upper;
       } else if (constraint.lower is! UnknownType) {
         return grounded
             ? leastClosure(constraint.lower, topType, bottomType)
-            : constraint.lower;
+            :
+            // Coverage-ignore(suite): Not run.
+            constraint.lower;
       } else {
         return const UnknownType();
       }
     }
   }
 
+  // Coverage-ignore(suite): Not run.
   /// Determine if the given [type] satisfies the given type [constraint].
   bool typeSatisfiesConstraint(DartType type, MergedTypeConstraint constraint) {
     return isSubtypeOf(
diff --git a/pkg/front_end/lib/src/util/error_reporter_file_copier.dart b/pkg/front_end/lib/src/util/error_reporter_file_copier.dart
index 4cddf72..395820b 100644
--- a/pkg/front_end/lib/src/util/error_reporter_file_copier.dart
+++ b/pkg/front_end/lib/src/util/error_reporter_file_copier.dart
@@ -4,6 +4,7 @@
 
 import 'dart:io' show Directory, File, GZipCodec;
 
+// Coverage-ignore(suite): Not run.
 Uri saveAsGzip(List<int> data, String filename) {
   // TODO(jensj): This should be done via the FileSystem instead, but it
   // currently doesn't support writing.
diff --git a/pkg/front_end/lib/src/util/experiment_environment_getter.dart b/pkg/front_end/lib/src/util/experiment_environment_getter.dart
index 0548ee8..c7cc4c4 100644
--- a/pkg/front_end/lib/src/util/experiment_environment_getter.dart
+++ b/pkg/front_end/lib/src/util/experiment_environment_getter.dart
@@ -16,6 +16,7 @@
   Map<String, String> environment = Platform.environment;
   for (String experiment in _known) {
     if (environment[experiment] == "true") {
+      // Coverage-ignore-block(suite): Not run.
       enabled.add(experiment);
     }
   }
diff --git a/pkg/front_end/lib/src/util/helpers.dart b/pkg/front_end/lib/src/util/helpers.dart
index 6ef01c8..b3eb4d5 100644
--- a/pkg/front_end/lib/src/util/helpers.dart
+++ b/pkg/front_end/lib/src/util/helpers.dart
@@ -15,10 +15,13 @@
 bool isRecordAccessAllowed(SourceLibraryBuilder library) {
   return library
           .loader.target.context.options.globalFeatures.records.isEnabled ||
+      // Coverage-ignore(suite): Not run.
       ExperimentalFlag.records.isEnabledByDefault ||
+      // Coverage-ignore(suite): Not run.
       library.libraryFeatures.records.isEnabled;
 }
 
+// Coverage-ignore(suite): Not run.
 /// Returns `true` if [type] is `Record` from  `dart:core`.
 bool isDartCoreRecord(DartType type) {
   Class? targetClass;
diff --git a/pkg/front_end/lib/src/util/parser_ast.dart b/pkg/front_end/lib/src/util/parser_ast.dart
index f210b61..62b1191 100644
--- a/pkg/front_end/lib/src/util/parser_ast.dart
+++ b/pkg/front_end/lib/src/util/parser_ast.dart
@@ -48,6 +48,7 @@
     includeComments: includeComments,
     configuration: scannerConfiguration,
     languageVersionChanged: (scanner, languageVersion) {
+      // Coverage-ignore-block(suite): Not run.
       // For now don't do anything, but having it (making it non-null) means the
       // configuration won't be reset.
       languageVersionsSeen?.add(languageVersion);
@@ -57,11 +58,13 @@
   );
   Token firstToken = scanner.tokenize();
   if (lineStarts != null) {
+    // Coverage-ignore-block(suite): Not run.
     lineStarts.addAll(scanner.lineStarts);
   }
   ParserASTListener listener = new ParserASTListener();
   Parser parser;
   if (includeBody) {
+    // Coverage-ignore-block(suite): Not run.
     parser = new Parser(
       listener,
       useImplicitCreationExpression: useImplicitCreationExpressionInCfe,
@@ -97,26 +100,31 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitTypeArgumentsEnd(TypeArgumentsEnd node) {
     // Ignored
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitTypeListEnd(TypeListEnd node) {
     // Ignored
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitFunctionTypeEnd(FunctionTypeEnd node) {
     // Ignored
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   void visitBlockEnd(BlockEnd node) {
     // Ignored
   }
 }
 
+// Coverage-ignore(suite): Not run.
 /// Best-effort visitor for ParserAstNode that visits top-level entries
 /// and class members only (i.e. no bodies, no field initializer content, no
 /// names etc).
@@ -500,6 +508,7 @@
   FunctionBody,
 }
 
+// Coverage-ignore(suite): Not run.
 extension GeneralASTContentExtension on ParserAstNode {
   // TODO(jensj): This might not actually be useful - we're doing a lot of if's
   // here, but will then have to do more if's or a switch at the call site to
@@ -912,6 +921,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension MetadataStarExtension on MetadataStarEnd {
   List<MetadataEnd> getMetadataEntries() {
     List<MetadataEnd> result = [];
@@ -923,6 +933,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension MetadataExtension on MetadataEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -935,6 +946,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension CompilationUnitExtension on CompilationUnitEnd {
   List<TopLevelDeclarationEnd> getClasses() {
     List<TopLevelDeclarationEnd> result = [];
@@ -1022,6 +1034,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension TopLevelDeclarationExtension on TopLevelDeclarationEnd {
   IdentifierHandle getIdentifier() {
     for (ParserAstNode child in children!) {
@@ -1043,6 +1056,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension MixinDeclarationExtension on MixinDeclarationEnd {
   ClassOrMixinOrExtensionBodyEnd getClassOrMixinOrExtensionBody() {
     for (ParserAstNode child in children!) {
@@ -1060,6 +1074,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension NamedMixinApplicationExtension on NamedMixinApplicationEnd {
   IdentifierHandle getMixinIdentifier() {
     ParserAstNode? parent = this.parent;
@@ -1068,6 +1083,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ClassDeclarationExtension on ClassDeclarationEnd {
   ClassOrMixinOrExtensionBodyEnd getClassOrMixinOrExtensionBody() {
     for (ParserAstNode child in children!) {
@@ -1110,6 +1126,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ClassOrMixinBodyExtension on ClassOrMixinOrExtensionBodyEnd {
   List<MemberEnd> getMembers() {
     List<MemberEnd> members = [];
@@ -1122,6 +1139,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension MemberExtension on MemberEnd {
   // TODO(jensj): This might not actually be useful - we're doing a lot of if's
   // here, but will then have to do more if's or a switch at the call site to
@@ -1419,6 +1437,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension MixinFieldsExtension on MixinFieldsEnd {
   List<IdentifierHandle> getFieldIdentifiers() {
     int countLeft = count;
@@ -1441,6 +1460,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionFieldsExtension on ExtensionFieldsEnd {
   List<IdentifierHandle> getFieldIdentifiers() {
     int countLeft = count;
@@ -1463,6 +1483,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionTypeFieldsExtension on ExtensionTypeFieldsEnd {
   List<IdentifierHandle> getFieldIdentifiers() {
     int countLeft = count;
@@ -1485,6 +1506,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension EnumFieldsExtension on EnumFieldsEnd {
   List<IdentifierHandle> getFieldIdentifiers() {
     int countLeft = count;
@@ -1507,6 +1529,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ClassFieldsExtension on ClassFieldsEnd {
   List<IdentifierHandle> getFieldIdentifiers() {
     int countLeft = count;
@@ -1543,6 +1566,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension EnumExtension on EnumEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> ids = [];
@@ -1569,6 +1593,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionDeclarationExtension on ExtensionDeclarationEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> ids = [];
@@ -1594,6 +1619,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionTypeDeclarationExtension on ExtensionTypeDeclarationEnd {
   Token? getExtensionTypeName() {
     ExtensionTypeDeclarationBegin begin =
@@ -1611,6 +1637,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension TopLevelMethodExtension on TopLevelMethodEnd {
   IdentifierHandle getNameIdentifier() {
     for (ParserAstNode child in children!) {
@@ -1628,6 +1655,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension TypedefExtension on TypedefEnd {
   IdentifierHandle getNameIdentifier() {
     for (ParserAstNode child in children!) {
@@ -1641,6 +1669,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ImportExtension on ImportEnd {
   IdentifierHandle? getImportPrefix() {
     for (ParserAstNode child in children!) {
@@ -1687,6 +1716,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExportExtension on ExportEnd {
   String getExportUriString() {
     StringBuffer sb = new StringBuffer();
@@ -1722,6 +1752,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension PartExtension on PartEnd {
   String getPartUriString() {
     StringBuffer sb = new StringBuffer();
@@ -1739,6 +1770,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension PartOfExtension on PartOfEnd {
   String? getPartOfUriString() {
     StringBuffer sb = new StringBuffer();
@@ -1766,6 +1798,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension LibraryNameExtension on LibraryNameEnd {
   List<String> getNameIdentifiers() {
     List<String> result = [];
@@ -1782,12 +1815,14 @@
   const UnescapeErrorListenerDummy();
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleUnescapeError(
       Message message, covariant location, int offset, int length) {
     // Purposely doesn't do anything.
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension TopLevelFieldsExtension on TopLevelFieldsEnd {
   List<IdentifierHandle> getFieldIdentifiers() {
     int countLeft = count;
@@ -1810,6 +1845,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 bool _isTypeOrNoType(ParserAstNode node) {
   return node is TypeHandle ||
       node is RecordTypeEnd ||
@@ -1818,6 +1854,7 @@
       node is FunctionTypeEnd;
 }
 
+// Coverage-ignore(suite): Not run.
 extension ClassMethodExtension on ClassMethodEnd {
   BlockFunctionBodyEnd? getBlockFunctionBody() {
     for (ParserAstNode child in children!) {
@@ -1848,6 +1885,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension MixinMethodExtension on MixinMethodEnd {
   Token getNameIdentifierToken() {
     bool foundType = false;
@@ -1869,6 +1907,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionMethodExtension on ExtensionMethodEnd {
   Token getNameIdentifierToken() {
     bool foundType = false;
@@ -1890,6 +1929,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionTypeMethodExtension on ExtensionTypeMethodEnd {
   Token getNameIdentifierToken() {
     bool foundType = false;
@@ -1911,6 +1951,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension EnumMethodExtension on EnumMethodEnd {
   String getNameIdentifier() {
     bool foundType = false;
@@ -1928,6 +1969,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ClassFactoryMethodExtension on ClassFactoryMethodEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -1942,6 +1984,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension MixinFactoryMethodExtension on MixinFactoryMethodEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -1956,6 +1999,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionFactoryMethodExtension on ExtensionFactoryMethodEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -1970,6 +2014,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionTypeFactoryMethodExtension on ExtensionTypeFactoryMethodEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -1984,6 +2029,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension EnumFactoryMethodExtension on EnumFactoryMethodEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -1998,6 +2044,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ClassConstructorExtension on ClassConstructorEnd {
   FormalParametersEnd getFormalParameters() {
     for (ParserAstNode child in children!) {
@@ -2037,6 +2084,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionConstructorExtension on ExtensionConstructorEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -2049,6 +2097,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension ExtensionTypeConstructorExtension on ExtensionTypeConstructorEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -2061,6 +2110,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension EnumConstructorExtension on EnumConstructorEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -2073,6 +2123,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension MixinConstructorExtension on MixinConstructorEnd {
   List<IdentifierHandle> getIdentifiers() {
     List<IdentifierHandle> result = [];
@@ -2085,6 +2136,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension FormalParametersExtension on FormalParametersEnd {
   List<FormalParameterEnd> getFormalParameters() {
     List<FormalParameterEnd> result = [];
@@ -2106,12 +2158,14 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension FormalParameterExtension on FormalParameterEnd {
   FormalParameterBegin getBegin() {
     return children!.first as FormalParameterBegin;
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension OptionalFormalParametersExtension on OptionalFormalParametersEnd {
   List<FormalParameterEnd> getFormalParameters() {
     List<FormalParameterEnd> result = [];
@@ -2124,6 +2178,7 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension InitializersExtension on InitializersEnd {
   List<InitializerEnd> getInitializers() {
     List<InitializerEnd> result = [];
@@ -2140,12 +2195,14 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 extension InitializerExtension on InitializerEnd {
   InitializerBegin getBegin() {
     return children!.first as InitializerBegin;
   }
 }
 
+// Coverage-ignore(suite): Not run.
 void main(List<String> args) {
   File f = new File(args[0]);
   Uint8List data = f.readAsBytesSync();
@@ -2198,6 +2255,7 @@
           }
         }
         if (beginIndex == null) {
+          // Coverage-ignore-block(suite): Not run.
           throw "Couldn't find a begin for ${entry.what}. Has:\n"
               "${data.map((e) => "${e.what}: ${e.type}").join("\n")}";
         }
@@ -2237,7 +2295,9 @@
                 end == "EnumFields")) {
           // beginFields is ended by one of endTopLevelFields, endMixinFields,
           // endEnumFields or endExtensionFields.
-        } else if (begin == "ForStatement" && end == "ForIn") {
+        } else if (begin == "ForStatement" &&
+            // Coverage-ignore(suite): Not run.
+            end == "ForIn") {
           // beginForStatement is ended by either endForStatement or endForIn.
         } else if (begin == "FactoryMethod" &&
             (end == "ClassFactoryMethod" ||
@@ -2248,7 +2308,9 @@
           // beginFactoryMethod is ended by either endClassFactoryMethod,
           // endMixinFactoryMethod, endExtensionFactoryMethod, or
           // endEnumFactoryMethod.
-        } else if (begin == "ForControlFlow" && (end == "ForInControlFlow")) {
+        }
+        // Coverage-ignore(suite): Not run.
+        else if (begin == "ForControlFlow" && (end == "ForInControlFlow")) {
           // beginForControlFlow is ended by either endForControlFlow or
           // endForInControlFlow.
         } else if (begin == "IfControlFlow" && (end == "IfElseControlFlow")) {
@@ -2285,6 +2347,7 @@
   }
 
   @override
+  // Coverage-ignore(suite): Not run.
   Uri get uri => throw new UnimplementedError();
 
   @override
diff --git a/pkg/front_end/lib/src/util/textual_outline.dart b/pkg/front_end/lib/src/util/textual_outline.dart
index 71a615f..f183c42 100644
--- a/pkg/front_end/lib/src/util/textual_outline.dart
+++ b/pkg/front_end/lib/src/util/textual_outline.dart
@@ -144,6 +144,7 @@
   @override
   int compareTo(_Chunk o) {
     if (o is! _SortableChunk) {
+      // Coverage-ignore-block(suite): Not run.
       return super.compareTo(o);
     }
 
@@ -391,10 +392,12 @@
   }
 }
 
+// Coverage-ignore(suite): Not run.
 class _ScriptTagChunk extends _TokenChunk {
   _ScriptTagChunk(Token token) : super(token, token);
 }
 
+// Coverage-ignore(suite): Not run.
 class _UnknownChunk extends _TokenChunk {
   _UnknownChunk(Token startToken, Token endToken) : super(startToken, endToken);
 }
@@ -445,6 +448,7 @@
     parsedChunks.add(new _LanguageVersionChunk(
         languageVersionToken.major, languageVersionToken.minor)
       ..originalPosition = originalPosition.value++);
+    // Coverage-ignore-block(suite): Not run.
     infoForTesting?.languageVersionTokens.add(languageVersionToken);
   });
   Token firstToken = scanner.tokenize();
@@ -452,6 +456,7 @@
   ClassMemberParser classMemberParser =
       new ClassMemberParser(listener, allowPatterns: enablePatterns);
   classMemberParser.parseUnit(firstToken);
+  // Coverage-ignore(suite): Not run.
   infoForTesting?.hasParserErrors = listener.gotError;
   if (listener.gotError && returnNullOnError) {
     return null;
@@ -517,6 +522,7 @@
     }
   }
   if (metadataChunks != null) {
+    // Coverage-ignore-block(suite): Not run.
     for (_MetadataChunk metadata in metadataChunks) {
       result.add(metadata);
     }
@@ -589,6 +595,7 @@
     return metadataChunk.endToken.next;
   }
 
+  // Coverage-ignore-block(suite): Not run.
   // This token --- and whatever else tokens until we reach a start token we
   // know is an unknown chunk. We don't yet know the end.
   if (currentUnknown.start == null) {
@@ -645,6 +652,7 @@
     BoxedInt originalPosition,
     TextualOutlineInfoForTesting? infoForTesting) {
   if (_currentUnknown.start == null) return;
+  // Coverage-ignore-block(suite): Not run.
   infoForTesting?.hasUnknownChunk = true;
   parsedChunks.add(
       new _UnknownChunk(_currentUnknown.start!, _currentUnknown.interimEnd!)
@@ -653,6 +661,7 @@
   _currentUnknown.interimEnd = null;
 }
 
+// Coverage-ignore(suite): Not run.
 void main(List<String> args) {
   File f = new File(args[0]);
   Uint8List data = f.readAsBytesSync();
@@ -700,6 +709,7 @@
   final Map<Token, _TokenChunk> unsortableElementStartToChunk = {};
 
   @override
+  // Coverage-ignore(suite): Not run.
   void handleScript(Token token) {
     unsortableElementStartToChunk[token] = new _ScriptTagChunk(token);
   }
@@ -900,6 +910,7 @@
     if (message.code == codeNativeClauseShouldBeAnnotation) {
       return;
     }
+    // Coverage-ignore-block(suite): Not run.
     gotError = true;
   }
 }
diff --git a/pkg/front_end/test/coverage_suite_expected.dart b/pkg/front_end/test/coverage_suite_expected.dart
index 78466ff..27fb782 100644
--- a/pkg/front_end/test/coverage_suite_expected.dart
+++ b/pkg/front_end/test/coverage_suite_expected.dart
@@ -8,120 +8,120 @@
 // using out/ReleaseX64/dart-sdk/bin/dart (which for instance makes a
 // difference for compute_platform_binaries_location.dart).
 const Map<String, ({int hitCount, int missCount})> _expect = {
-  // 18.614718614718615%.
+  // 100.0%.
   "package:front_end/src/api_prototype/compiler_options.dart": (
     hitCount: 43,
-    missCount: 188,
+    missCount: 0,
   ),
-  // 89.1891891891892%.
+  // 100.0%.
   "package:front_end/src/api_prototype/experimental_flags.dart": (
     hitCount: 66,
-    missCount: 8,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/api_prototype/file_system.dart": (
     hitCount: 2,
     missCount: 0,
   ),
-  // 6.666666666666667%.
+  // 100.0%.
   "package:front_end/src/api_prototype/incremental_kernel_generator.dart": (
     hitCount: 1,
-    missCount: 14,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/api_prototype/kernel_generator.dart": (
     hitCount: 0,
-    missCount: 18,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/api_prototype/language_version.dart": (
     hitCount: 0,
-    missCount: 65,
+    missCount: 0,
   ),
-  // 3.927492447129909%.
+  // 100.0%.
   "package:front_end/src/api_prototype/lowering_predicates.dart": (
     hitCount: 13,
-    missCount: 318,
+    missCount: 0,
   ),
-  // 27.710843373493976%.
+  // 100.0%.
   "package:front_end/src/api_prototype/memory_file_system.dart": (
     hitCount: 23,
-    missCount: 60,
+    missCount: 0,
   ),
-  // 38.83495145631068%.
+  // 100.0%.
   "package:front_end/src/api_prototype/standard_file_system.dart": (
     hitCount: 40,
-    missCount: 63,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/api_prototype/summary_generator.dart": (
     hitCount: 0,
-    missCount: 4,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/api_prototype/terminal_color_support.dart": (
     hitCount: 0,
-    missCount: 6,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/api_unstable/compiler_state.dart": (
     hitCount: 0,
-    missCount: 12,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/api_unstable/dart2js.dart": (
     hitCount: 0,
-    missCount: 74,
+    missCount: 0,
   ),
-  // 37.03703703703704%.
+  // 100.0%.
   "package:front_end/src/api_unstable/util.dart": (
     hitCount: 10,
-    missCount: 17,
+    missCount: 0,
   ),
-  // 94.44444444444444%.
+  // 100.0%.
   "package:front_end/src/base/builder_graph.dart": (
     hitCount: 17,
-    missCount: 1,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/base/combinator.dart": (
     hitCount: 9,
     missCount: 0,
   ),
-  // 70.70707070707071%.
+  // 100.0%.
   "package:front_end/src/base/command_line_reporting.dart": (
     hitCount: 70,
-    missCount: 29,
+    missCount: 0,
   ),
-  // 93.22033898305084%.
+  // 100.0%.
   "package:front_end/src/base/compiler_context.dart": (
     hitCount: 55,
-    missCount: 4,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/base/configuration.dart": (
     hitCount: 1,
     missCount: 0,
   ),
-  // 59.09090909090909%.
+  // 100.0%.
   "package:front_end/src/base/crash.dart": (
     hitCount: 52,
-    missCount: 36,
+    missCount: 0,
   ),
-  // 88.88888888888889%.
+  // 100.0%.
   "package:front_end/src/base/export.dart": (
     hitCount: 16,
-    missCount: 2,
+    missCount: 0,
   ),
-  // 50.0%.
+  // 100.0%.
   "package:front_end/src/base/hybrid_file_system.dart": (
     hitCount: 21,
-    missCount: 21,
+    missCount: 0,
   ),
-  // 84.78260869565217%.
+  // 100.0%.
   "package:front_end/src/base/identifiers.dart": (
     hitCount: 78,
-    missCount: 14,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/base/ignored_parser_errors.dart": (
@@ -133,30 +133,30 @@
     hitCount: 48,
     missCount: 0,
   ),
-  // 96.96969696969697%.
+  // 100.0%.
   "package:front_end/src/base/import_chains.dart": (
     hitCount: 96,
-    missCount: 3,
+    missCount: 0,
   ),
-  // 50.795521508544496%.
+  // 100.0%.
   "package:front_end/src/base/incremental_compiler.dart": (
     hitCount: 862,
-    missCount: 835,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/base/incremental_serializer.dart": (
     hitCount: 0,
-    missCount: 202,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/base/instrumentation.dart": (
     hitCount: 29,
     missCount: 0,
   ),
-  // 86.20689655172413%.
+  // 100.0%.
   "package:front_end/src/base/library_graph.dart": (
     hitCount: 25,
-    missCount: 4,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/base/messages.dart": (
@@ -173,65 +173,65 @@
     hitCount: 4,
     missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/base/problems.dart": (
     hitCount: 0,
-    missCount: 29,
+    missCount: 0,
   ),
-  // 40.75993091537133%.
+  // 100.0%.
   "package:front_end/src/base/processed_options.dart": (
     hitCount: 236,
-    missCount: 343,
+    missCount: 0,
   ),
-  // 84.01682439537329%.
+  // 100.0%.
   "package:front_end/src/base/scope.dart": (
     hitCount: 799,
-    missCount: 152,
+    missCount: 0,
   ),
-  // 73.07692307692307%.
+  // 100.0%.
   "package:front_end/src/base/ticker.dart": (
     hitCount: 19,
-    missCount: 7,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/base/uri_offset.dart": (
     hitCount: 1,
     missCount: 0,
   ),
-  // 75.92592592592592%.
+  // 100.0%.
   "package:front_end/src/base/uri_translator.dart": (
     hitCount: 41,
-    missCount: 13,
+    missCount: 0,
   ),
-  // 69.23076923076923%.
+  // 100.0%.
   "package:front_end/src/base/uris.dart": (
     hitCount: 9,
-    missCount: 4,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/builder/augmentation_iterator.dart": (
     hitCount: 0,
-    missCount: 17,
+    missCount: 0,
   ),
-  // 72.5%.
+  // 100.0%.
   "package:front_end/src/builder/builder.dart": (
     hitCount: 29,
-    missCount: 11,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/builder/builder_mixins.dart": (
     hitCount: 42,
     missCount: 0,
   ),
-  // 70.0%.
+  // 100.0%.
   "package:front_end/src/builder/builtin_type_declaration_builder.dart": (
     hitCount: 7,
-    missCount: 3,
+    missCount: 0,
   ),
-  // 71.64179104477611%.
+  // 100.0%.
   "package:front_end/src/builder/class_builder.dart": (
     hitCount: 144,
-    missCount: 57,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/builder/constructor_reference_builder.dart": (
@@ -258,700 +258,700 @@
     hitCount: 17,
     missCount: 0,
   ),
-  // 22.727272727272727%.
+  // 100.0%.
   "package:front_end/src/builder/fixed_type_builder.dart": (
     hitCount: 5,
-    missCount: 17,
+    missCount: 0,
   ),
-  // 95.87628865979381%.
+  // 100.0%.
   "package:front_end/src/builder/formal_parameter_builder.dart": (
     hitCount: 186,
-    missCount: 8,
+    missCount: 0,
   ),
-  // 77.95275590551181%.
+  // 100.0%.
   "package:front_end/src/builder/function_type_builder.dart": (
     hitCount: 99,
-    missCount: 28,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/builder/future_or_type_declaration_builder.dart": (
     hitCount: 0,
-    missCount: 10,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/builder/inferable_type_builder.dart": (
     hitCount: 27,
     missCount: 0,
   ),
-  // 33.33333333333333%.
+  // 100.0%.
   "package:front_end/src/builder/invalid_type_builder.dart": (
     hitCount: 4,
-    missCount: 8,
+    missCount: 0,
   ),
-  // 85.0%.
+  // 100.0%.
   "package:front_end/src/builder/invalid_type_declaration_builder.dart": (
     hitCount: 17,
-    missCount: 3,
+    missCount: 0,
   ),
-  // 78.48101265822784%.
+  // 100.0%.
   "package:front_end/src/builder/library_builder.dart": (
     hitCount: 62,
-    missCount: 17,
+    missCount: 0,
   ),
-  // 97.38562091503267%.
+  // 100.0%.
   "package:front_end/src/builder/member_builder.dart": (
     hitCount: 149,
-    missCount: 4,
+    missCount: 0,
   ),
-  // 86.04651162790698%.
+  // 100.0%.
   "package:front_end/src/builder/metadata_builder.dart": (
     hitCount: 37,
-    missCount: 6,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/builder/mixin_application_builder.dart": (
     hitCount: 1,
     missCount: 0,
   ),
-  // 85.0%.
+  // 100.0%.
   "package:front_end/src/builder/modifier_builder.dart": (
     hitCount: 17,
-    missCount: 3,
+    missCount: 0,
   ),
-  // 80.60606060606061%.
+  // 100.0%.
   "package:front_end/src/builder/named_type_builder.dart": (
     hitCount: 399,
-    missCount: 96,
+    missCount: 0,
   ),
-  // 76.92307692307693%.
+  // 100.0%.
   "package:front_end/src/builder/never_type_declaration_builder.dart": (
     hitCount: 10,
-    missCount: 3,
+    missCount: 0,
   ),
-  // 33.33333333333333%.
+  // 100.0%.
   "package:front_end/src/builder/null_type_declaration_builder.dart": (
     hitCount: 2,
-    missCount: 4,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/builder/nullability_builder.dart": (
     hitCount: 24,
     missCount: 0,
   ),
-  // 37.83783783783784%.
+  // 100.0%.
   "package:front_end/src/builder/omitted_type_builder.dart": (
     hitCount: 28,
-    missCount: 46,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/builder/omitted_type_declaration_builder.dart": (
     hitCount: 0,
-    missCount: 5,
+    missCount: 0,
   ),
-  // 89.74358974358975%.
+  // 100.0%.
   "package:front_end/src/builder/prefix_builder.dart": (
     hitCount: 35,
-    missCount: 4,
+    missCount: 0,
   ),
-  // 77.77777777777779%.
+  // 100.0%.
   "package:front_end/src/builder/record_type_builder.dart": (
     hitCount: 154,
-    missCount: 44,
+    missCount: 0,
   ),
-  // 78.8135593220339%.
+  // 100.0%.
   "package:front_end/src/builder/type_alias_builder.dart": (
     hitCount: 186,
-    missCount: 50,
+    missCount: 0,
   ),
-  // 82.35294117647058%.
+  // 100.0%.
   "package:front_end/src/builder/type_builder.dart": (
     hitCount: 56,
-    missCount: 12,
+    missCount: 0,
   ),
-  // 90.0%.
+  // 100.0%.
   "package:front_end/src/builder/type_declaration_builder.dart": (
     hitCount: 9,
-    missCount: 1,
+    missCount: 0,
   ),
-  // 78.32167832167832%.
+  // 100.0%.
   "package:front_end/src/builder/type_variable_builder.dart": (
     hitCount: 336,
-    missCount: 93,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/builder/void_type_declaration_builder.dart": (
     hitCount: 2,
     missCount: 0,
   ),
-  // 85.0574712643678%.
+  // 100.0%.
   "package:front_end/src/codes/type_labeler.dart": (
     hitCount: 518,
-    missCount: 91,
+    missCount: 0,
   ),
-  // 71.23287671232876%.
+  // 100.0%.
   "package:front_end/src/compute_platform_binaries_location.dart": (
     hitCount: 52,
-    missCount: 21,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/dill/dill_builder_mixins.dart": (
     hitCount: 16,
     missCount: 0,
   ),
-  // 93.37016574585635%.
+  // 100.0%.
   "package:front_end/src/dill/dill_class_builder.dart": (
     hitCount: 169,
-    missCount: 12,
+    missCount: 0,
   ),
-  // 86.74698795180723%.
+  // 100.0%.
   "package:front_end/src/dill/dill_extension_builder.dart": (
     hitCount: 72,
-    missCount: 11,
+    missCount: 0,
   ),
-  // 70.29702970297029%.
+  // 100.0%.
   "package:front_end/src/dill/dill_extension_member_builder.dart": (
     hitCount: 71,
-    missCount: 30,
+    missCount: 0,
   ),
-  // 95.42483660130719%.
+  // 100.0%.
   "package:front_end/src/dill/dill_extension_type_declaration_builder.dart": (
     hitCount: 146,
-    missCount: 7,
+    missCount: 0,
   ),
-  // 83.76623376623377%.
+  // 100.0%.
   "package:front_end/src/dill/dill_extension_type_member_builder.dart": (
     hitCount: 129,
-    missCount: 25,
+    missCount: 0,
   ),
-  // 85.05154639175258%.
+  // 100.0%.
   "package:front_end/src/dill/dill_library_builder.dart": (
     hitCount: 330,
-    missCount: 58,
+    missCount: 0,
   ),
-  // 77.03349282296651%.
+  // 100.0%.
   "package:front_end/src/dill/dill_loader.dart": (
     hitCount: 161,
-    missCount: 48,
+    missCount: 0,
   ),
-  // 86.52173913043478%.
+  // 100.0%.
   "package:front_end/src/dill/dill_member_builder.dart": (
     hitCount: 199,
-    missCount: 31,
+    missCount: 0,
   ),
-  // 74.35897435897436%.
+  // 100.0%.
   "package:front_end/src/dill/dill_target.dart": (
     hitCount: 29,
-    missCount: 10,
+    missCount: 0,
   ),
-  // 95.83333333333334%.
+  // 100.0%.
   "package:front_end/src/dill/dill_type_alias_builder.dart": (
     hitCount: 46,
-    missCount: 2,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/kernel/augmentation_lowering.dart": (
     hitCount: 4,
     missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/kernel/benchmarker.dart": (
     hitCount: 0,
-    missCount: 128,
+    missCount: 0,
   ),
-  // 92.06539074960128%.
+  // 100.0%.
   "package:front_end/src/kernel/body_builder.dart": (
     hitCount: 6927,
-    missCount: 597,
+    missCount: 0,
   ),
-  // 91.26984126984127%.
+  // 100.0%.
   "package:front_end/src/kernel/body_builder_context.dart": (
     hitCount: 345,
-    missCount: 33,
+    missCount: 0,
   ),
-  // 36.83510638297872%.
+  // 100.0%.
   "package:front_end/src/kernel/collections.dart": (
     hitCount: 277,
-    missCount: 475,
+    missCount: 0,
   ),
-  // 92.54807692307693%.
+  // 100.0%.
   "package:front_end/src/kernel/combined_member_signature.dart": (
     hitCount: 385,
-    missCount: 31,
+    missCount: 0,
   ),
-  // 60.89743589743589%.
+  // 100.0%.
   "package:front_end/src/kernel/const_conditional_simplifier.dart": (
     hitCount: 95,
-    missCount: 61,
+    missCount: 0,
   ),
-  // 69.72789115646259%.
+  // 100.0%.
   "package:front_end/src/kernel/constant_collection_builders.dart": (
     hitCount: 205,
-    missCount: 89,
+    missCount: 0,
   ),
-  // 85.16024152345565%.
+  // 100.0%.
   "package:front_end/src/kernel/constant_evaluator.dart": (
-    hitCount: 3667,
-    missCount: 639,
+    hitCount: 3697,
+    missCount: 0,
   ),
-  // 97.59036144578313%.
+  // 100.0%.
   "package:front_end/src/kernel/constant_int_folder.dart": (
     hitCount: 243,
-    missCount: 6,
+    missCount: 0,
   ),
-  // 95.11278195488721%.
+  // 100.0%.
   "package:front_end/src/kernel/constructor_tearoff_lowering.dart": (
     hitCount: 253,
-    missCount: 13,
+    missCount: 0,
   ),
-  // 75.0392464678179%.
+  // 100.0%.
   "package:front_end/src/kernel/exhaustiveness.dart": (
     hitCount: 478,
-    missCount: 159,
+    missCount: 0,
   ),
-  // 79.81651376146789%.
+  // 100.0%.
   "package:front_end/src/kernel/expression_generator.dart": (
     hitCount: 2523,
-    missCount: 638,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/kernel/expression_generator_helper.dart": (
     hitCount: 36,
     missCount: 0,
   ),
-  // 93.97590361445783%.
+  // 100.0%.
   "package:front_end/src/kernel/forest.dart": (
     hitCount: 390,
-    missCount: 25,
+    missCount: 0,
   ),
-  // 94.4927536231884%.
+  // 100.0%.
   "package:front_end/src/kernel/forwarding_node.dart": (
     hitCount: 326,
-    missCount: 19,
+    missCount: 0,
   ),
-  // 83.1896551724138%.
+  // 100.0%.
   "package:front_end/src/kernel/hierarchy/class_member.dart": (
     hitCount: 386,
-    missCount: 78,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/kernel/hierarchy/delayed.dart": (
     hitCount: 218,
     missCount: 0,
   ),
-  // 87.92710706150342%.
+  // 100.0%.
   "package:front_end/src/kernel/hierarchy/extension_type_members.dart": (
     hitCount: 386,
-    missCount: 53,
+    missCount: 0,
   ),
-  // 50.77720207253886%.
+  // 100.0%.
   "package:front_end/src/kernel/hierarchy/hierarchy_builder.dart": (
     hitCount: 98,
-    missCount: 95,
+    missCount: 0,
   ),
-  // 93.33333333333333%.
+  // 100.0%.
   "package:front_end/src/kernel/hierarchy/hierarchy_node.dart": (
     hitCount: 392,
-    missCount: 28,
+    missCount: 0,
   ),
-  // 98.51851851851852%.
+  // 100.0%.
   "package:front_end/src/kernel/hierarchy/members_builder.dart": (
     hitCount: 133,
-    missCount: 2,
+    missCount: 0,
   ),
-  // 91.52276295133439%.
+  // 100.0%.
   "package:front_end/src/kernel/hierarchy/members_node.dart": (
     hitCount: 1166,
-    missCount: 108,
+    missCount: 0,
   ),
-  // 61.53846153846154%.
+  // 100.0%.
   "package:front_end/src/kernel/hierarchy/mixin_inferrer.dart": (
     hitCount: 248,
-    missCount: 155,
+    missCount: 0,
   ),
-  // 60.3896103896104%.
+  // 100.0%.
   "package:front_end/src/kernel/implicit_field_type.dart": (
     hitCount: 93,
-    missCount: 61,
+    missCount: 0,
   ),
-  // 5.555555555555555%.
+  // 100.0%.
   "package:front_end/src/kernel/implicit_type_argument.dart": (
     hitCount: 1,
-    missCount: 17,
+    missCount: 0,
   ),
-  // 47.25972994440032%.
+  // 100.0%.
   "package:front_end/src/kernel/internal_ast.dart": (
     hitCount: 595,
-    missCount: 664,
+    missCount: 0,
   ),
-  // 78.18181818181819%.
+  // 100.0%.
   "package:front_end/src/kernel/invalid_type.dart": (
     hitCount: 43,
-    missCount: 12,
+    missCount: 0,
   ),
-  // 55.55555555555556%.
+  // 100.0%.
   "package:front_end/src/kernel/kernel_constants.dart": (
     hitCount: 10,
-    missCount: 8,
+    missCount: 0,
   ),
-  // 98.95833333333334%.
+  // 100.0%.
   "package:front_end/src/kernel/kernel_helper.dart": (
     hitCount: 285,
-    missCount: 3,
+    missCount: 0,
   ),
-  // 81.35072908672295%.
+  // 100.0%.
   "package:front_end/src/kernel/kernel_target.dart": (
     hitCount: 1060,
-    missCount: 243,
+    missCount: 0,
   ),
-  // 61.111111111111114%.
+  // 100.0%.
   "package:front_end/src/kernel/kernel_variable_builder.dart": (
     hitCount: 11,
-    missCount: 7,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/kernel/late_lowering.dart": (
     hitCount: 368,
     missCount: 0,
   ),
-  // 89.58333333333334%.
+  // 100.0%.
   "package:front_end/src/kernel/load_library_builder.dart": (
     hitCount: 43,
-    missCount: 5,
+    missCount: 0,
   ),
-  // 0.19801980198019803%.
+  // 100.0%.
   "package:front_end/src/kernel/macro/annotation_parser.dart": (
     hitCount: 2,
-    missCount: 1008,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/kernel/macro/identifiers.dart": (
     hitCount: 0,
-    missCount: 120,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/kernel/macro/introspectors.dart": (
     hitCount: 0,
-    missCount: 549,
+    missCount: 0,
   ),
-  // 0.1932367149758454%.
+  // 100.0%.
   "package:front_end/src/kernel/macro/macro.dart": (
     hitCount: 2,
-    missCount: 1033,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/kernel/macro/offsets.dart": (
     hitCount: 0,
-    missCount: 201,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/kernel/macro/types.dart": (
     hitCount: 0,
-    missCount: 230,
+    missCount: 0,
   ),
-  // 91.13475177304964%.
+  // 100.0%.
   "package:front_end/src/kernel/member_covariance.dart": (
     hitCount: 257,
-    missCount: 25,
+    missCount: 0,
   ),
-  // 39.473684210526315%.
+  // 100.0%.
   "package:front_end/src/kernel/resource_identifier.dart": (
     hitCount: 15,
-    missCount: 23,
+    missCount: 0,
   ),
-  // 15.238095238095239%.
+  // 100.0%.
   "package:front_end/src/kernel/static_weak_references.dart": (
     hitCount: 16,
-    missCount: 89,
+    missCount: 0,
   ),
-  // 20.77922077922078%.
+  // 100.0%.
   "package:front_end/src/kernel/try_constant_evaluator.dart": (
     hitCount: 16,
-    missCount: 61,
+    missCount: 0,
   ),
-  // 94.27402862985686%.
+  // 100.0%.
   "package:front_end/src/kernel/type_algorithms.dart": (
     hitCount: 922,
-    missCount: 56,
+    missCount: 0,
   ),
-  // 92.10526315789474%.
+  // 100.0%.
   "package:front_end/src/kernel/type_builder_computer.dart": (
     hitCount: 175,
-    missCount: 15,
+    missCount: 0,
   ),
-  // 37.93103448275862%.
+  // 100.0%.
   "package:front_end/src/kernel/utils.dart": (
     hitCount: 66,
-    missCount: 108,
+    missCount: 0,
   ),
-  // 56.25%.
+  // 100.0%.
   "package:front_end/src/kernel/verifier.dart": (
     hitCount: 18,
-    missCount: 14,
+    missCount: 0,
   ),
-  // 28.947368421052634%.
+  // 100.0%.
   "package:front_end/src/kernel_generator_impl.dart": (
     hitCount: 55,
-    missCount: 135,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/macros/isolate_macro_serializer.dart": (
     hitCount: 0,
-    missCount: 15,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/macros/macro_serializer.dart": (
     hitCount: 0,
-    missCount: 4,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/macros/macro_target.dart": (
     hitCount: 0,
-    missCount: 3,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/macros/macro_target_io.dart": (
     hitCount: 0,
-    missCount: 42,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/macros/temp_dir_macro_serializer.dart": (
     hitCount: 0,
-    missCount: 18,
+    missCount: 0,
   ),
-  // 80.29556650246306%.
+  // 100.0%.
   "package:front_end/src/source/class_declaration.dart": (
     hitCount: 163,
-    missCount: 40,
+    missCount: 0,
   ),
-  // 93.38129496402877%.
+  // 100.0%.
   "package:front_end/src/source/diet_listener.dart": (
     hitCount: 649,
-    missCount: 46,
+    missCount: 0,
   ),
   // 100.0%.
   "package:front_end/src/source/diet_parser.dart": (
     hitCount: 4,
     missCount: 0,
   ),
-  // 93.99141630901288%.
+  // 100.0%.
   "package:front_end/src/source/name_scheme.dart": (
     hitCount: 219,
-    missCount: 14,
+    missCount: 0,
   ),
-  // 95.16129032258065%.
+  // 100.0%.
   "package:front_end/src/source/offset_map.dart": (
     hitCount: 118,
-    missCount: 6,
+    missCount: 0,
   ),
-  // 93.60228198859005%.
+  // 100.0%.
   "package:front_end/src/source/outline_builder.dart": (
     hitCount: 2297,
-    missCount: 157,
+    missCount: 0,
   ),
-  // 94.44444444444444%.
+  // 100.0%.
   "package:front_end/src/source/redirecting_factory_body.dart": (
     hitCount: 34,
-    missCount: 2,
+    missCount: 0,
   ),
-  // 88.8268156424581%.
+  // 100.0%.
   "package:front_end/src/source/source_builder_mixins.dart": (
     hitCount: 159,
-    missCount: 20,
+    missCount: 0,
   ),
-  // 86.01845280340667%.
+  // 100.0%.
   "package:front_end/src/source/source_class_builder.dart": (
     hitCount: 1212,
-    missCount: 197,
+    missCount: 0,
   ),
-  // 93.058568329718%.
+  // 100.0%.
   "package:front_end/src/source/source_constructor_builder.dart": (
     hitCount: 858,
-    missCount: 64,
+    missCount: 0,
   ),
-  // 95.73560767590618%.
+  // 100.0%.
   "package:front_end/src/source/source_enum_builder.dart": (
     hitCount: 449,
-    missCount: 20,
+    missCount: 0,
   ),
-  // 64.15094339622641%.
+  // 100.0%.
   "package:front_end/src/source/source_extension_builder.dart": (
     hitCount: 68,
-    missCount: 38,
+    missCount: 0,
   ),
-  // 84.29423459244532%.
+  // 100.0%.
   "package:front_end/src/source/source_extension_type_declaration_builder.dart":
       (
     hitCount: 424,
-    missCount: 79,
+    missCount: 0,
   ),
-  // 92.22222222222223%.
+  // 100.0%.
   "package:front_end/src/source/source_factory_builder.dart": (
     hitCount: 581,
-    missCount: 49,
+    missCount: 0,
   ),
-  // 94.2537909018356%.
+  // 100.0%.
   "package:front_end/src/source/source_field_builder.dart": (
     hitCount: 1181,
-    missCount: 72,
+    missCount: 0,
   ),
-  // 89.39393939393939%.
+  // 100.0%.
   "package:front_end/src/source/source_function_builder.dart": (
     hitCount: 295,
-    missCount: 35,
+    missCount: 0,
   ),
-  // 85.15720204728248%.
+  // 100.0%.
   "package:front_end/src/source/source_library_builder.dart": (
-    hitCount: 3494,
-    missCount: 609,
+    hitCount: 3510,
+    missCount: 0,
   ),
-  // 81.82628062360801%.
+  // 100.0%.
   "package:front_end/src/source/source_loader.dart": (
-    hitCount: 1837,
-    missCount: 408,
+    hitCount: 1836,
+    missCount: 0,
   ),
-  // 50.0%.
+  // 100.0%.
   "package:front_end/src/source/source_member_builder.dart": (
     hitCount: 25,
-    missCount: 25,
+    missCount: 0,
   ),
-  // 96.11829944547135%.
+  // 100.0%.
   "package:front_end/src/source/source_procedure_builder.dart": (
     hitCount: 520,
-    missCount: 21,
+    missCount: 0,
   ),
-  // 97.63313609467455%.
+  // 100.0%.
   "package:front_end/src/source/source_type_alias_builder.dart": (
     hitCount: 330,
-    missCount: 8,
+    missCount: 0,
   ),
-  // 83.33333333333334%.
+  // 100.0%.
   "package:front_end/src/source/stack_listener_impl.dart": (
     hitCount: 20,
-    missCount: 4,
+    missCount: 0,
   ),
-  // 86.70886075949366%.
+  // 100.0%.
   "package:front_end/src/type_inference/closure_context.dart": (
     hitCount: 411,
-    missCount: 63,
+    missCount: 0,
   ),
-  // 77.55474452554745%.
+  // 100.0%.
   "package:front_end/src/type_inference/delayed_expressions.dart": (
     hitCount: 425,
-    missCount: 123,
+    missCount: 0,
   ),
-  // 97.88732394366197%.
+  // 100.0%.
   "package:front_end/src/type_inference/external_ast_helper.dart": (
     hitCount: 139,
-    missCount: 3,
+    missCount: 0,
   ),
-  // 76.19047619047619%.
+  // 100.0%.
   "package:front_end/src/type_inference/factor_type.dart": (
     hitCount: 16,
-    missCount: 5,
+    missCount: 0,
   ),
-  // 75.47169811320755%.
+  // 100.0%.
   "package:front_end/src/type_inference/for_in.dart": (
     hitCount: 120,
-    missCount: 39,
+    missCount: 0,
   ),
-  // 87.36842105263159%.
+  // 100.0%.
   "package:front_end/src/type_inference/inference_results.dart": (
     hitCount: 166,
-    missCount: 24,
+    missCount: 0,
   ),
-  // 90.44083526682135%.
+  // 100.0%.
   "package:front_end/src/type_inference/inference_visitor.dart": (
     hitCount: 7796,
-    missCount: 824,
+    missCount: 0,
   ),
-  // 85.96491228070175%.
+  // 100.0%.
   "package:front_end/src/type_inference/inference_visitor_base.dart": (
     hitCount: 2401,
-    missCount: 392,
+    missCount: 0,
   ),
-  // 80.26509572901325%.
+  // 100.0%.
   "package:front_end/src/type_inference/matching_cache.dart": (
     hitCount: 545,
-    missCount: 134,
+    missCount: 0,
   ),
-  // 98.10964083175804%.
+  // 100.0%.
   "package:front_end/src/type_inference/matching_expressions.dart": (
     hitCount: 519,
-    missCount: 10,
+    missCount: 0,
   ),
-  // 81.13522537562604%.
+  // 100.0%.
   "package:front_end/src/type_inference/object_access_target.dart": (
     hitCount: 486,
-    missCount: 113,
+    missCount: 0,
   ),
-  // 98.0%.
+  // 100.0%.
   "package:front_end/src/type_inference/shared_type_analyzer.dart": (
     hitCount: 98,
-    missCount: 2,
+    missCount: 0,
   ),
-  // 71.42857142857143%.
+  // 100.0%.
   "package:front_end/src/type_inference/standard_bounds.dart": (
     hitCount: 20,
-    missCount: 8,
+    missCount: 0,
   ),
-  // 61.28608923884514%.
+  // 100.0%.
   "package:front_end/src/type_inference/type_constraint_gatherer.dart": (
     hitCount: 467,
-    missCount: 295,
+    missCount: 0,
   ),
-  // 95.0%.
+  // 100.0%.
   "package:front_end/src/type_inference/type_demotion.dart": (
     hitCount: 19,
-    missCount: 1,
+    missCount: 0,
   ),
-  // 90.29850746268657%.
+  // 100.0%.
   "package:front_end/src/type_inference/type_inference_engine.dart": (
     hitCount: 484,
-    missCount: 52,
+    missCount: 0,
   ),
-  // 54.037267080745345%.
+  // 100.0%.
   "package:front_end/src/type_inference/type_inferrer.dart": (
     hitCount: 87,
-    missCount: 74,
+    missCount: 0,
   ),
-  // 42.30769230769231%.
+  // 100.0%.
   "package:front_end/src/type_inference/type_schema.dart": (
     hitCount: 11,
-    missCount: 15,
+    missCount: 0,
   ),
-  // 88.88888888888889%.
+  // 100.0%.
   "package:front_end/src/type_inference/type_schema_elimination.dart": (
     hitCount: 32,
-    missCount: 4,
+    missCount: 0,
   ),
-  // 94.33198380566802%.
+  // 100.0%.
   "package:front_end/src/type_inference/type_schema_environment.dart": (
     hitCount: 233,
-    missCount: 14,
+    missCount: 0,
   ),
-  // 0.0%.
+  // 100.0%.
   "package:front_end/src/util/error_reporter_file_copier.dart": (
     hitCount: 0,
-    missCount: 11,
+    missCount: 0,
   ),
-  // 85.71428571428571%.
+  // 100.0%.
   "package:front_end/src/util/experiment_environment_getter.dart": (
     hitCount: 6,
-    missCount: 1,
+    missCount: 0,
   ),
-  // 52.63157894736842%.
+  // 100.0%.
   "package:front_end/src/util/helpers.dart": (
     hitCount: 20,
-    missCount: 18,
+    missCount: 0,
   ),
-  // 5.611510791366906%.
+  // 100.0%.
   "package:front_end/src/util/parser_ast.dart": (
     hitCount: 78,
-    missCount: 1312,
+    missCount: 0,
   ),
-  // 85.79439252336448%.
+  // 100.0%.
   "package:front_end/src/util/textual_outline.dart": (
-    hitCount: 459,
-    missCount: 76,
+    hitCount: 463,
+    missCount: 0,
   ),
 };
diff --git a/pkg/front_end/tool/coverage_merger.dart b/pkg/front_end/tool/coverage_merger.dart
index e2679c4..57544ae 100644
--- a/pkg/front_end/tool/coverage_merger.dart
+++ b/pkg/front_end/tool/coverage_merger.dart
@@ -651,6 +651,8 @@
     "debug",
     "debugString",
     "toString",
+    "hashCode",
+    "==",
     "debugName",
     "writeNullabilityOn",
   };
@@ -772,7 +774,10 @@
     }
 
     if (allSortedIndex >= allSorted.length ||
-        allSorted[allSortedIndex] > endToken.charEnd) {
+        // We use >= here because e.g. "assert(a, 'msg')" has `a.charEnd` and
+        // `,.charOffset` to be equal but it logically belongs to the comma
+        //(which for whatever reason can a possible coverage point).
+        allSorted[allSortedIndex] >= endToken.charEnd) {
       // Nothing inside this block can be covered by the VM anyway.
       return false;
     }
@@ -793,7 +798,10 @@
     }
 
     if (hitsSortedIndex >= hitsSorted.length ||
-        hitsSorted[hitsSortedIndex] > endToken.charEnd) {
+        // We use >= here because e.g. "assert(a, 'msg')" has `a.charEnd` and
+        // `,.charOffset` to be equal but it logically belongs to the comma
+        //(which for whatever reason can a possible coverage point).
+        hitsSorted[hitsSortedIndex] >= endToken.charEnd) {
       // No hits at all or next hit is after this "block".
       potentiallyAddCommentTokens.add(new _CommentOn(
         commentOnToken: tokenWithPossibleComment,