diff --git a/DEPS b/DEPS
index 94da789..18515bc 100644
--- a/DEPS
+++ b/DEPS
@@ -44,7 +44,7 @@
   # co19 is a cipd package. Use update.sh in tests/co19[_2] to update these
   # hashes. It requires access to the dart-build-access group, which EngProd
   # has.
-  "co19_rev": "28b7e665580cecdf64bc3c81c5b4ed137380c33d",
+  "co19_rev": "c051b94705832669ea10d6e064e777aad87b0e25",
   "co19_2_rev": "e48b3090826cf40b8037648f19d211e8eab1b4b6",
 
   # The internal benchmarks to use. See go/dart-benchmarks-internal
diff --git a/pkg/_fe_analyzer_shared/lib/src/messages/codes_generated.dart b/pkg/_fe_analyzer_shared/lib/src/messages/codes_generated.dart
index 115b54b..e13f628 100644
--- a/pkg/_fe_analyzer_shared/lib/src/messages/codes_generated.dart
+++ b/pkg/_fe_analyzer_shared/lib/src/messages/codes_generated.dart
@@ -6459,16 +6459,6 @@
 }
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
-const Code<Null> codeNonNullableOptOut = messageNonNullableOptOut;
-
-// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
-const MessageCode messageNonNullableOptOut = const MessageCode(
-    "NonNullableOptOut",
-    message: r"""Null safety features are disabled for this library.""",
-    tip:
-        r"""Try removing the `@dart=` annotation or setting the language version higher.""");
-
-// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Code<Null> codeNonNullableOptOutComment = messageNonNullableOptOutComment;
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
@@ -6479,6 +6469,62 @@
         r"""This is the annotation that opts out this library from null safety features.""");
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Template<
+    Message Function(
+        String
+            string)> templateNonNullableOptOutExplicit = const Template<
+        Message Function(String string)>(
+    messageTemplate: r"""Null safety features are disabled for this library.""",
+    tipTemplate:
+        r"""Try removing the `@dart=` annotation or setting the language version to #string or higher.""",
+    withArguments: _withArgumentsNonNullableOptOutExplicit);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Message Function(String string)> codeNonNullableOptOutExplicit =
+    const Code<Message Function(String string)>(
+  "NonNullableOptOutExplicit",
+  templateNonNullableOptOutExplicit,
+);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+Message _withArgumentsNonNullableOptOutExplicit(String string) {
+  if (string.isEmpty) throw 'No string provided';
+  return new Message(codeNonNullableOptOutExplicit,
+      message: """Null safety features are disabled for this library.""",
+      tip:
+          """Try removing the `@dart=` annotation or setting the language version to ${string} or higher.""",
+      arguments: {'string': string});
+}
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Template<
+    Message Function(
+        String
+            string)> templateNonNullableOptOutImplicit = const Template<
+        Message Function(String string)>(
+    messageTemplate: r"""Null safety features are disabled for this library.""",
+    tipTemplate:
+        r"""Try removing the package language version or setting the language version to #string or higher.""",
+    withArguments: _withArgumentsNonNullableOptOutImplicit);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Message Function(String string)> codeNonNullableOptOutImplicit =
+    const Code<Message Function(String string)>(
+  "NonNullableOptOutImplicit",
+  templateNonNullableOptOutImplicit,
+);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+Message _withArgumentsNonNullableOptOutImplicit(String string) {
+  if (string.isEmpty) throw 'No string provided';
+  return new Message(codeNonNullableOptOutImplicit,
+      message: """Null safety features are disabled for this library.""",
+      tip:
+          """Try removing the package language version or setting the language version to ${string} or higher.""",
+      arguments: {'string': string});
+}
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Code<Null> codeNonPartOfDirectiveInPart = messageNonPartOfDirectiveInPart;
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index 38b05d1..9b61e31 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.dart
@@ -828,6 +828,10 @@
       }
 
       _updateAnalysisOptions(info);
+      final optionsFile = info?.analysisDriver?.contextRoot?.optionsFilePath;
+      if (optionsFile != null) {
+        _analyzeAnalysisOptionsFile(driver, optionsFile);
+      }
     }
   }
 
diff --git a/pkg/analysis_server/lib/src/lsp/lsp_analysis_server.dart b/pkg/analysis_server/lib/src/lsp/lsp_analysis_server.dart
index d52a6a35..b40b962 100644
--- a/pkg/analysis_server/lib/src/lsp/lsp_analysis_server.dart
+++ b/pkg/analysis_server/lib/src/lsp/lsp_analysis_server.dart
@@ -495,8 +495,8 @@
   void setAnalysisRoots(List<String> includedPaths) {
     declarationsTracker?.discardContexts();
     final uniquePaths = HashSet<String>.of(includedPaths ?? const []);
-    contextManager.setRoots(uniquePaths.toList(), []);
     notificationManager.setAnalysisRoots(includedPaths, []);
+    contextManager.setRoots(uniquePaths.toList(), []);
     addContextsToDeclarationsTracker();
   }
 
diff --git a/pkg/analysis_server/lib/src/services/correction/dart/create_constructor_for_final_fields.dart b/pkg/analysis_server/lib/src/services/correction/dart/create_constructor_for_final_fields.dart
index 07a9f44..2c879f1 100644
--- a/pkg/analysis_server/lib/src/services/correction/dart/create_constructor_for_final_fields.dart
+++ b/pkg/analysis_server/lib/src/services/correction/dart/create_constructor_for_final_fields.dart
@@ -34,7 +34,7 @@
     for (var member in classDeclaration.members) {
       if (member is FieldDeclaration) {
         var variableList = member.fields;
-        if (variableList.isFinal) {
+        if (variableList.isFinal && !variableList.isLate) {
           fieldNames.addAll(variableList.variables
               .where((v) => v.initializer == null)
               .map((v) => v.name.name));
diff --git a/pkg/analysis_server/test/analysis/notification_errors_test.dart b/pkg/analysis_server/test/analysis/notification_errors_test.dart
index 07aa487e..b07322c 100644
--- a/pkg/analysis_server/test/analysis/notification_errors_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_errors_test.dart
@@ -6,6 +6,7 @@
 import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
+import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/lint/linter.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:linter/src/rules.dart';
@@ -13,6 +14,7 @@
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../analysis_abstract.dart';
+import '../src/utilities/mock_packages.dart';
 
 void main() {
   defineReflectiveSuite(() {
@@ -22,6 +24,7 @@
 
 @reflectiveTest
 class NotificationErrorsTest extends AbstractAnalysisTest {
+  Folder pedanticFolder;
   Map<String, List<AnalysisError>> filesErrors = {};
 
   @override
@@ -44,6 +47,7 @@
     server.handlers = [
       AnalysisDomainHandler(server),
     ];
+    pedanticFolder = MockPackages.instance.addPedantic(resourceProvider);
   }
 
   Future<void> test_analysisOptionsFile() async {
@@ -70,6 +74,38 @@
     expect(error.type, AnalysisErrorType.STATIC_WARNING);
   }
 
+  Future<void> test_analysisOptionsFile_packageInclude() async {
+    var filePath = join(projectPath, 'analysis_options.yaml');
+    var analysisOptionsFile = newFile(filePath, content: '''
+include: package:pedantic/analysis_options.yaml
+''').path;
+
+    var request =
+        AnalysisSetAnalysisRootsParams([projectPath], []).toRequest('0');
+    handleSuccessfulRequest(request);
+    await waitForTasksFinished();
+    await pumpEventQueue();
+
+    // Verify there's an error for the import.
+    var errors = filesErrors[analysisOptionsFile];
+    expect(errors, hasLength(1));
+    var error = errors[0];
+    expect(error.location.file, filePath);
+    expect(error.severity, AnalysisErrorSeverity.WARNING);
+    expect(error.type, AnalysisErrorType.STATIC_WARNING);
+
+    // Write a package file that allows resolving the include.
+    newFile('$projectPath/.packages', content: '''
+pedantic:${pedanticFolder.toUri()}
+''');
+
+    // Ensure the errors disappear.
+    await waitForTasksFinished();
+    await pumpEventQueue();
+    errors = filesErrors[analysisOptionsFile];
+    expect(errors, hasLength(0));
+  }
+
   Future<void> test_androidManifestFile() async {
     var filePath = join(projectPath, 'android', 'AndroidManifest.xml');
     var manifestFile = newFile(filePath, content: '''
diff --git a/pkg/analysis_server/test/lsp/diagnostic_test.dart b/pkg/analysis_server/test/lsp/diagnostic_test.dart
index 2716301..565fd21 100644
--- a/pkg/analysis_server/test/lsp/diagnostic_test.dart
+++ b/pkg/analysis_server/test/lsp/diagnostic_test.dart
@@ -3,11 +3,13 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analysis_server/lsp_protocol/protocol_generated.dart';
+import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart' as plugin;
 import 'package:analyzer_plugin/protocol/protocol_generated.dart' as plugin;
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
+import '../src/utilities/mock_packages.dart';
 import 'server_abstract.dart';
 
 void main() {
@@ -18,6 +20,8 @@
 
 @reflectiveTest
 class DiagnosticTest extends AbstractLspAnalysisServerTest {
+  Folder pedanticLibFolder;
+
   Future<void> checkPluginErrorsForFile(String pluginAnalyzedFilePath) async {
     final pluginAnalyzedUri = Uri.file(pluginAnalyzedFilePath);
 
@@ -63,6 +67,12 @@
     expect(related.location.range.end.character, equals(16));
   }
 
+  @override
+  void setUp() {
+    super.setUp();
+    pedanticLibFolder = MockPackages.instance.addPedantic(resourceProvider);
+  }
+
   Future<void> test_afterDocumentEdits() async {
     const initialContents = 'int a = 1;';
     newFile(mainFilePath, content: initialContents);
@@ -80,6 +90,45 @@
     expect(updatedDiagnostics, hasLength(1));
   }
 
+  Future<void> test_analysisOptionsFile() async {
+    newFile(analysisOptionsPath, content: '''
+linter:
+  rules:
+    - invalid_lint_rule_name
+''').path;
+
+    final firstDiagnosticsUpdate = waitForDiagnostics(analysisOptionsUri);
+    await initialize();
+    final initialDiagnostics = await firstDiagnosticsUpdate;
+    expect(initialDiagnostics, hasLength(1));
+    expect(initialDiagnostics.first.severity, DiagnosticSeverity.Warning);
+    expect(initialDiagnostics.first.code, 'undefined_lint_warning');
+  }
+
+  Future<void> test_analysisOptionsFile_packageInclude() async {
+    newFile(analysisOptionsPath, content: '''
+include: package:pedantic/analysis_options.yaml
+''').path;
+
+    // Verify there's an error for the import.
+    final firstDiagnosticsUpdate = waitForDiagnostics(analysisOptionsUri);
+    await initialize();
+    final initialDiagnostics = await firstDiagnosticsUpdate;
+    expect(initialDiagnostics, hasLength(1));
+    expect(initialDiagnostics.first.severity, DiagnosticSeverity.Warning);
+    expect(initialDiagnostics.first.code, 'include_file_not_found');
+
+    // Write a package file that allows resolving the include.
+    final secondDiagnosticsUpdate = waitForDiagnostics(analysisOptionsUri);
+    newFile('$projectFolderPath/.packages', content: '''
+pedantic:${pedanticLibFolder.toUri()}
+''');
+
+    // Ensure the error disappeared.
+    final updatedDiagnostics = await secondDiagnosticsUpdate;
+    expect(updatedDiagnostics, hasLength(0));
+  }
+
   Future<void> test_contextMessage() async {
     newFile(mainFilePath, content: '''
 void f() {
diff --git a/pkg/analysis_server/test/mock_packages/pedantic/lib/analysis_options.yaml b/pkg/analysis_server/test/mock_packages/pedantic/lib/analysis_options.yaml
new file mode 100644
index 0000000..d753c96
--- /dev/null
+++ b/pkg/analysis_server/test/mock_packages/pedantic/lib/analysis_options.yaml
@@ -0,0 +1 @@
+# Used for testing diagnostics for imports in analysis_options.yaml files.
diff --git a/pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart
index 93e5edc..e8ae0d7 100644
--- a/pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart
@@ -1076,4 +1076,20 @@
     await computeSuggestions();
     assertNoSuggestions();
   }
+
+  Future<void> test_superConstructorInvocation() async {
+    addTestSource('''
+class A {
+  final bool field1;
+  final int field2;
+  A({this.field1, this.field2});
+}
+class B extends A {
+  B() : super(^);
+}
+''');
+    await computeSuggestions();
+    assertSuggestArgumentsAndTypes(
+        namedArgumentsWithTypes: {'field1': 'bool', 'field2': 'int'});
+  }
 }
diff --git a/pkg/analysis_server/test/src/services/correction/fix/create_constructor_for_final_fields_test.dart b/pkg/analysis_server/test/src/services/correction/fix/create_constructor_for_final_fields_test.dart
index 741a585..4c0a8d0 100644
--- a/pkg/analysis_server/test/src/services/correction/fix/create_constructor_for_final_fields_test.dart
+++ b/pkg/analysis_server/test/src/services/correction/fix/create_constructor_for_final_fields_test.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analysis_server/src/services/correction/fix.dart';
+import 'package:analyzer/src/dart/analysis/experiments.dart';
 import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ -11,6 +12,7 @@
 void main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(CreateConstructorForFinalFieldsTest);
+    defineReflectiveTests(CreateConstructorForFinalFieldsWithNullSafetyTest);
   });
 }
 
@@ -135,3 +137,30 @@
     await assertNoFix();
   }
 }
+
+@reflectiveTest
+class CreateConstructorForFinalFieldsWithNullSafetyTest
+    extends FixProcessorTest {
+  @override
+  List<String> get experiments => [EnableString.non_nullable];
+
+  @override
+  FixKind get kind => DartFixKind.CREATE_CONSTRUCTOR_FOR_FINAL_FIELDS;
+
+  Future<void> test_excludesLate() async {
+    await resolveTestUnit('''
+class Test {
+  final int a;
+  late final int b;
+}
+''');
+    await assertHasFix('''
+class Test {
+  final int a;
+  late final int b;
+
+  Test(this.a);
+}
+''');
+  }
+}
diff --git a/pkg/analysis_server/test/src/utilities/mock_packages.dart b/pkg/analysis_server/test/src/utilities/mock_packages.dart
index e88c9c1..2bfb8d4 100644
--- a/pkg/analysis_server/test/src/utilities/mock_packages.dart
+++ b/pkg/analysis_server/test/src/utilities/mock_packages.dart
@@ -29,6 +29,11 @@
     return packageFolder.getChildAssumingFolder('lib');
   }
 
+  Folder addPedantic(MemoryResourceProvider provider) {
+    var packageFolder = _addFiles(provider, 'pedantic');
+    return packageFolder.getChildAssumingFolder('lib');
+  }
+
   Folder addUI(MemoryResourceProvider provider) {
     var packageFolder = _addFiles(provider, 'ui');
     return packageFolder.getChildAssumingFolder('lib');
diff --git a/pkg/analyzer/CHANGELOG.md b/pkg/analyzer/CHANGELOG.md
index 7ff78e1..1eb1e16 100644
--- a/pkg/analyzer/CHANGELOG.md
+++ b/pkg/analyzer/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## 0.40.1-dev
 * Added `LocalVariableElement.hasInitializer`,
   `PropertyInducingElement.hasInitializer`, `ParameterElement.hasDefaultValue`.
+* `ElementImpl.toString()` uses `getDisplayString(withNullability: true)`.
 
 ## 0.40.0
 * Added `LibraryElement.featureSet`.
diff --git a/pkg/analyzer/lib/dart/element/element.dart b/pkg/analyzer/lib/dart/element/element.dart
index 31dadf0..0b17e13 100644
--- a/pkg/analyzer/lib/dart/element/element.dart
+++ b/pkg/analyzer/lib/dart/element/element.dart
@@ -764,6 +764,10 @@
   /// sealed.
   bool get isSealed;
 
+  /// Return `true` if this annotation marks the associated class as being
+  /// intended to be used as an annotation.
+  bool get isTarget;
+
   /// Return `true` if this annotation marks the associated member as being
   /// visible for template files.
   bool get isVisibleForTemplate;
diff --git a/pkg/analyzer/lib/error/error.dart b/pkg/analyzer/lib/error/error.dart
index 3030d6d..aba9b3e 100644
--- a/pkg/analyzer/lib/error/error.dart
+++ b/pkg/analyzer/lib/error/error.dart
@@ -490,6 +490,7 @@
   HintCode.INFERENCE_FAILURE_ON_INSTANCE_CREATION,
   HintCode.INFERENCE_FAILURE_ON_UNINITIALIZED_VARIABLE,
   HintCode.INFERENCE_FAILURE_ON_UNTYPED_PARAMETER,
+  HintCode.INVALID_ANNOTATION_TARGET,
   HintCode.INVALID_FACTORY_ANNOTATION,
   HintCode.INVALID_FACTORY_METHOD_DECL,
   HintCode.INVALID_FACTORY_METHOD_IMPL,
@@ -566,6 +567,16 @@
   HintCode.UNUSED_LABEL,
   HintCode.UNUSED_LOCAL_VARIABLE,
   HintCode.UNUSED_SHOWN_NAME,
+  LanguageCode.IMPLICIT_DYNAMIC_FIELD,
+  LanguageCode.IMPLICIT_DYNAMIC_FUNCTION,
+  LanguageCode.IMPLICIT_DYNAMIC_INVOKE,
+  LanguageCode.IMPLICIT_DYNAMIC_LIST_LITERAL,
+  LanguageCode.IMPLICIT_DYNAMIC_MAP_LITERAL,
+  LanguageCode.IMPLICIT_DYNAMIC_METHOD,
+  LanguageCode.IMPLICIT_DYNAMIC_PARAMETER,
+  LanguageCode.IMPLICIT_DYNAMIC_RETURN,
+  LanguageCode.IMPLICIT_DYNAMIC_TYPE,
+  LanguageCode.IMPLICIT_DYNAMIC_VARIABLE,
   ManifestWarningCode.CAMERA_PERMISSIONS_INCOMPATIBLE,
   ManifestWarningCode.NO_TOUCHSCREEN_FEATURE,
   ManifestWarningCode.NON_RESIZABLE_ACTIVITY,
@@ -789,16 +800,6 @@
   StaticWarningCode.INVALID_OVERRIDE_DIFFERENT_DEFAULT_VALUES_POSITIONAL,
   StaticWarningCode.MISSING_ENUM_CONSTANT_IN_SWITCH,
   StaticWarningCode.UNNECESSARY_NON_NULL_ASSERTION,
-  StrongModeCode.IMPLICIT_DYNAMIC_FIELD,
-  StrongModeCode.IMPLICIT_DYNAMIC_FUNCTION,
-  StrongModeCode.IMPLICIT_DYNAMIC_INVOKE,
-  StrongModeCode.IMPLICIT_DYNAMIC_LIST_LITERAL,
-  StrongModeCode.IMPLICIT_DYNAMIC_MAP_LITERAL,
-  StrongModeCode.IMPLICIT_DYNAMIC_METHOD,
-  StrongModeCode.IMPLICIT_DYNAMIC_PARAMETER,
-  StrongModeCode.IMPLICIT_DYNAMIC_RETURN,
-  StrongModeCode.IMPLICIT_DYNAMIC_TYPE,
-  StrongModeCode.IMPLICIT_DYNAMIC_VARIABLE,
   StrongModeCode.TOP_LEVEL_FUNCTION_LITERAL_BLOCK,
   StrongModeCode.TOP_LEVEL_IDENTIFIER_NO_TYPE,
   StrongModeCode.TOP_LEVEL_INSTANCE_GETTER,
diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index 0923d43..9115009 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -1767,11 +1767,21 @@
   EvaluationResultImpl get evaluationResult {
     if (_evaluationResult == null) {
       Map<String, DartObjectImpl> fieldMap = <String, DartObjectImpl>{
+        'index': DartObjectImpl(
+          library.typeSystem,
+          library.typeProvider.intType,
+          IntState(_index),
+        ),
+        // TODO(brianwilkerson) There shouldn't be a field with the same name as
+        //  the constant, but we can't remove it until a version of dartdoc that
+        //  doesn't depend on it has been published and pulled into the SDK. The
+        //  map entry below should be removed when
+        //  https://github.com/dart-lang/dartdoc/issues/2318 has been resolved.
         name: DartObjectImpl(
           library.typeSystem,
           library.typeProvider.intType,
           IntState(_index),
-        )
+        ),
       };
       DartObjectImpl value = DartObjectImpl(
         library.typeSystem,
@@ -2324,6 +2334,10 @@
   /// The name of `meta` library, used to define analysis annotations.
   static const String _META_LIB_NAME = "meta";
 
+  /// The name of `meta_meta` library, used to define annotations for other
+  /// annotations.
+  static const String _META_META_LIB_NAME = "meta_meta";
+
   /// The name of the top-level variable used to mark a method as requiring
   /// overriders to call super.
   static const String _MUST_CALL_SUPER_VARIABLE_NAME = "mustCallSuper";
@@ -2357,6 +2371,10 @@
   /// The name of the top-level variable used to mark a class as being sealed.
   static const String _SEALED_VARIABLE_NAME = "sealed";
 
+  /// The name of the class used to annotate a class as an annotation with a
+  /// specific set of target element kinds.
+  static const String _TARGET_CLASS_NAME = 'Target';
+
   /// The name of the top-level variable used to mark a method as being
   /// visible for templates.
   static const String _VISIBLE_FOR_TEMPLATE_VARIABLE_NAME =
@@ -2512,6 +2530,12 @@
       element.library?.name == _META_LIB_NAME;
 
   @override
+  bool get isTarget =>
+      element is ConstructorElement &&
+      element.enclosingElement.name == _TARGET_CLASS_NAME &&
+      element.library?.name == _META_META_LIB_NAME;
+
+  @override
   bool get isVisibleForTemplate =>
       element is PropertyAccessorElement &&
       element.name == _VISIBLE_FOR_TEMPLATE_VARIABLE_NAME &&
@@ -3088,7 +3112,7 @@
 
   @override
   String toString() {
-    return getDisplayString(withNullability: false);
+    return getDisplayString(withNullability: true);
   }
 
   @override
diff --git a/pkg/analyzer/lib/src/dart/element/type.dart b/pkg/analyzer/lib/src/dart/element/type.dart
index 7c697e2..83c3e77 100644
--- a/pkg/analyzer/lib/src/dart/element/type.dart
+++ b/pkg/analyzer/lib/src/dart/element/type.dart
@@ -1305,7 +1305,7 @@
   }
 
   @override
-  TypeImpl withNullability(NullabilitySuffix nullabilitySuffix) {
+  InterfaceTypeImpl withNullability(NullabilitySuffix nullabilitySuffix) {
     if (this.nullabilitySuffix == nullabilitySuffix) return this;
 
     return InterfaceTypeImpl(
diff --git a/pkg/analyzer/lib/src/dart/element/type_provider.dart b/pkg/analyzer/lib/src/dart/element/type_provider.dart
index 3ce7283..0ab40ba 100644
--- a/pkg/analyzer/lib/src/dart/element/type_provider.dart
+++ b/pkg/analyzer/lib/src/dart/element/type_provider.dart
@@ -57,16 +57,19 @@
   InterfaceType _boolType;
   InterfaceType _deprecatedType;
   InterfaceType _doubleType;
+  InterfaceType _doubleTypeQuestion;
   InterfaceType _functionType;
   InterfaceType _futureDynamicType;
   InterfaceType _futureNullType;
   InterfaceType _futureOrNullType;
   InterfaceType _intType;
+  InterfaceType _intTypeQuestion;
   InterfaceType _iterableDynamicType;
   InterfaceType _iterableObjectType;
   InterfaceType _mapObjectObjectType;
   InterfaceType _nullType;
   InterfaceType _numType;
+  InterfaceType _numTypeQuestion;
   InterfaceType _objectType;
   InterfaceType _stackTraceType;
   InterfaceType _streamDynamicType;
@@ -148,6 +151,10 @@
     return _doubleType;
   }
 
+  InterfaceType get doubleTypeQuestion =>
+      _doubleTypeQuestion ??= (doubleType as InterfaceTypeImpl)
+          .withNullability(NullabilitySuffix.question);
+
   @override
   DartType get dynamicType => DynamicTypeImpl.instance;
 
@@ -208,6 +215,10 @@
     return _intType;
   }
 
+  InterfaceType get intTypeQuestion =>
+      _intTypeQuestion ??= (intType as InterfaceTypeImpl)
+          .withNullability(NullabilitySuffix.question);
+
   @override
   InterfaceType get iterableDynamicType {
     _iterableDynamicType ??= InterfaceTypeImpl(
@@ -298,6 +309,10 @@
     return _numType;
   }
 
+  InterfaceType get numTypeQuestion =>
+      _numTypeQuestion ??= (numType as InterfaceTypeImpl)
+          .withNullability(NullabilitySuffix.question);
+
   ClassElement get objectElement {
     return _objectElement ??= _getClassElement(_coreLibrary, 'Object');
   }
diff --git a/pkg/analyzer/lib/src/dart/element/type_system.dart b/pkg/analyzer/lib/src/dart/element/type_system.dart
index 19a3d5f..9918dee 100644
--- a/pkg/analyzer/lib/src/dart/element/type_system.dart
+++ b/pkg/analyzer/lib/src/dart/element/type_system.dart
@@ -25,6 +25,7 @@
 import 'package:analyzer/src/dart/element/top_merge.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/type_algebra.dart';
+import 'package:analyzer/src/dart/element/type_provider.dart';
 import 'package:analyzer/src/dart/element/type_schema.dart';
 import 'package:analyzer/src/dart/element/type_schema_elimination.dart';
 import 'package:meta/meta.dart';
@@ -315,6 +316,24 @@
   DartType refineBinaryExpressionType(DartType leftType, TokenType operator,
       DartType rightType, DartType currentType, MethodElement operatorElement);
 
+  /// Determines the context type for the parameters of a method invocation
+  /// where the type of the target is [targetType], the method being invoked is
+  /// [methodElement], the context surrounding the method invocation is
+  /// [invocationContext], and the context type produced so far by resolution is
+  /// [currentType].
+  DartType refineNumericInvocationContext(DartType targetType,
+      Element methodElement, DartType invocationContext, DartType currentType);
+
+  /// Determines the type of a method invocation where the type of the target is
+  /// [targetType], the method being invoked is [methodElement], the types of
+  /// the arguments passed to the method are [argumentTypes], and the type
+  /// produced so far by resolution is [currentType].
+  DartType refineNumericInvocationType(
+      DartType targetType,
+      MethodElement methodElement,
+      List<DartType> argumentTypes,
+      DartType currentType);
+
   @override
   DartType resolveToBound(DartType type) {
     if (type is TypeParameterTypeImpl) {
@@ -406,7 +425,7 @@
   bool strictInference;
 
   @override
-  final TypeProvider typeProvider;
+  final TypeProviderImpl typeProvider;
 
   /// The cached instance of `Object?`.
   InterfaceTypeImpl _objectQuestion;
@@ -430,8 +449,9 @@
     @required this.implicitCasts,
     @required bool isNonNullableByDefault,
     @required this.strictInference,
-    @required this.typeProvider,
-  }) : super(isNonNullableByDefault: isNonNullableByDefault) {
+    @required TypeProvider typeProvider,
+  })  : typeProvider = typeProvider as TypeProviderImpl,
+        super(isNonNullableByDefault: isNonNullableByDefault) {
     _greatestLowerBoundHelper = GreatestLowerBoundHelper(this);
     _leastUpperBoundHelper = LeastUpperBoundHelper(this);
     _subtypeHelper = SubtypeHelper(this);
@@ -1357,6 +1377,33 @@
     }
   }
 
+  @override
+  DartType refineNumericInvocationContext(DartType targetType,
+      Element methodElement, DartType invocationContext, DartType currentType) {
+    if (methodElement is MethodElement && isNonNullableByDefault) {
+      return _refineNumericInvocationContextNullSafe(
+          targetType, methodElement, invocationContext, currentType);
+    } else {
+      // No special rules apply.
+      return currentType;
+    }
+  }
+
+  @override
+  DartType refineNumericInvocationType(
+      DartType targetType,
+      Element methodElement,
+      List<DartType> argumentTypes,
+      DartType currentType) {
+    if (methodElement is MethodElement && isNonNullableByDefault) {
+      return _refineNumericInvocationTypeNullSafe(
+          targetType, methodElement, argumentTypes, currentType);
+    } else {
+      // No special rules apply.
+      return currentType;
+    }
+  }
+
   /// Replaces all covariant occurrences of `dynamic`, `void`, and `Object` or
   /// `Object?` with `Null` or `Never` and all contravariant occurrences of
   /// `Null` or `Never` with `Object` or `Object?`.
@@ -1514,11 +1561,122 @@
     return currentType;
   }
 
+  DartType _refineNumericInvocationContextNullSafe(
+      DartType targetType,
+      MethodElement methodElement,
+      DartType invocationContext,
+      DartType currentType) {
+    // If the method being invoked comes from an extension, don't refine the
+    // type because we can only make guarantees about methods defined in the
+    // SDK, and the numeric methods we refine are all instance methods.
+    if (methodElement.enclosingElement is ExtensionElement) {
+      return currentType;
+    }
+
+    // Sometimes the analyzer represents the unknown context as `null`.
+    invocationContext ??= UnknownInferredType.instance;
+
+    // If e is an expression of the form e1 + e2, e1 - e2, e1 * e2, e1 % e2 or
+    // e1.remainder(e2)...
+    if (const {'+', '-', '*', '%', 'remainder'}.contains(methodElement.name)) {
+      // ...where C is the context type of e and T is the static type of e1, and
+      // where T is a non-Never subtype of num...
+      // Notes:
+      // - We don't have to check for Never because if T is Never, the method
+      //   element will fail to resolve so we'll never reach here.
+      // - We actually check against `num?` rather than `num`.  It's equivalent
+      //   from the standpoint of correctness (since it's illegal to call these
+      //   methods on nullable types, and that's checked for elsewhere), but
+      //   better from the standpoint of error recovery (since it allows e.g.
+      //   `int? + int` to resolve to `int` rather than `num`).
+      var c = invocationContext;
+      var t = targetType;
+      assert(!t.isBottom);
+      var numType = typeProvider.numType;
+      if (isSubtypeOf(t, typeProvider.numTypeQuestion)) {
+        // Then:
+        // - If int <: C, not num <: C, and T <: int, then the context type of
+        //   e2 is int.
+        // (Note: as above, we check the type of T against `int?`, because it's
+        // equivalent and leads to better error recovery.)
+        var intType = typeProvider.intType;
+        if (isSubtypeOf(intType, c) &&
+            !isSubtypeOf(numType, c) &&
+            isSubtypeOf(t, typeProvider.intTypeQuestion)) {
+          return intType;
+        }
+        // - If double <: C, not num <: C, and not T <: double, then the context
+        //   type of e2 is double.
+        // (Note: as above, we check the type of T against `double?`, because
+        // it's equivalent and leads to better error recovery.)
+        var doubleType = typeProvider.doubleType;
+        if (isSubtypeOf(doubleType, c) &&
+            !isSubtypeOf(numType, c) &&
+            !isSubtypeOf(t, typeProvider.doubleTypeQuestion)) {
+          return doubleType;
+        }
+        // Otherwise, the context type of e2 is num.
+        return numType;
+      }
+    }
+    // If e is an expression of the form e1.clamp(e2, e3)...
+    if (methodElement.name == 'clamp') {
+      // ...where C is the context type of e and T is the static type of e1
+      // where T is a non-Never subtype of num...
+      // Notes:
+      // - We don't have to check for Never because if T is Never, the method
+      //   element will fail to resolve so we'll never reach here.
+      // - We actually check against `num?` rather than `num`.  It's
+      //   equivalent from the standpoint of correctness (since it's illegal
+      //   to call `num.clamp` on a nullable type or to pass it a nullable
+      //   type as an argument, and that's checked for elsewhere), but better
+      //   from the standpoint of error recovery (since it allows e.g.
+      //   `int?.clamp(e2, e3)` to give the same context to `e2` and `e3` that
+      //   `int.clamp(e2, e3` would).
+      var c = invocationContext;
+      var t = targetType;
+      assert(!t.isBottom);
+      var numType = typeProvider.numType;
+      if (isSubtypeOf(t, typeProvider.numTypeQuestion)) {
+        // Then:
+        // - If int <: C, not num <: C, and T <: int, then the context type of
+        //   e2 and e3 is int.
+        // (Note: as above, we check the type of T against `int?`, because it's
+        // equivalent and leads to better error recovery.)
+        var intType = typeProvider.intType;
+        if (isSubtypeOf(intType, c) &&
+            !isSubtypeOf(numType, c) &&
+            isSubtypeOf(t, typeProvider.intTypeQuestion)) {
+          return intType;
+        }
+        // - If double <: C, not num <: C, and T <: double, then the context
+        //   type of e2 and e3 is double.
+        var doubleType = typeProvider.doubleType;
+        if (isSubtypeOf(doubleType, c) &&
+            !isSubtypeOf(numType, c) &&
+            isSubtypeOf(t, typeProvider.doubleTypeQuestion)) {
+          return doubleType;
+        }
+        // - Otherwise the context type of e2 an e3 is num.
+        return numType;
+      }
+    }
+    // No special rules apply.
+    return currentType;
+  }
+
   DartType _refineNumericInvocationTypeNullSafe(
       DartType targetType,
       MethodElement methodElement,
       List<DartType> argumentTypes,
       DartType currentType) {
+    // If the method being invoked comes from an extension, don't refine the
+    // type because we can only make guarantees about methods defined in the
+    // SDK, and the numeric methods we refine are all instance methods.
+    if (methodElement.enclosingElement is ExtensionElement) {
+      return currentType;
+    }
+
     // Let e be an expression of one of the forms e1 + e2, e1 - e2, e1 * e2,
     // e1 % e2 or e1.remainder(e2)...
     if (const {'+', '-', '*', '%', 'remainder'}.contains(methodElement.name)) {
@@ -1533,9 +1691,7 @@
       //   `int? + int` to resolve to `int` rather than `num`).
       var t = targetType;
       assert(!t.isBottom);
-      var numType = typeProvider.numType;
-      var numTypeQuestion = makeNullable(numType as InterfaceTypeImpl);
-      if (isSubtypeOf(t, numTypeQuestion)) {
+      if (isSubtypeOf(t, typeProvider.numTypeQuestion)) {
         // ...and where the static type of e2 is S and S is assignable to num.
         // (Note: we don't have to check that S is assignable to num because
         // this is required by the signature of the method.)
@@ -1547,8 +1703,7 @@
           // (Note: as above, we check against `double?` because it's equivalent
           // and leads to better error recovery.)
           var doubleType = typeProvider.doubleType;
-          var doubleTypeQuestion =
-              makeNullable(doubleType as InterfaceTypeImpl);
+          var doubleTypeQuestion = typeProvider.doubleTypeQuestion;
           if (isSubtypeOf(t, doubleTypeQuestion)) {
             return doubleType;
           }
@@ -1561,15 +1716,14 @@
           // - If T <: int, S <: int and not S <: Never, then the static type of
           //   e is int.
           // (As above, we check against `int?` for error recovery.)
-          var intType = typeProvider.intType;
-          var intTypeQuestion = makeNullable(intType as InterfaceTypeImpl);
+          var intTypeQuestion = typeProvider.intTypeQuestion;
           if (!s.isBottom &&
               isSubtypeOf(t, intTypeQuestion) &&
               isSubtypeOf(s, intTypeQuestion)) {
-            return intType;
+            return typeProvider.intType;
           }
           // - Otherwise the static type of e is num.
-          return numType;
+          return typeProvider.numType;
         }
       }
     }
@@ -1582,45 +1736,44 @@
         var t2 = argumentTypes[0];
         var t3 = argumentTypes[1];
         // ...and where T1, T2, and T3 are all non-Never subtypes of num.
-        // (Note: we actually check against `num?` rather than `num`.  It's
-        // equivalent from the standpoint of correctness (since it's illegal to
-        // call `num.clamp` on a nullable type or to pass it a nullable type
-        // as an argument, and that's checked for elsewhere), but better from
-        // the standpoint of error recovery (since it allows e.g.
-        // `int?.clamp(int, int)` to resolve to `int` rather than `num`).
-        var numType = typeProvider.numType;
-        var numTypeQuestion = makeNullable(numType as InterfaceTypeImpl);
-        if (!t1.isBottom &&
-            isSubtypeOf(t1, numTypeQuestion) &&
-            !t2.isBottom &&
-            isSubtypeOf(t2, numTypeQuestion) &&
-            !t3.isBottom &&
-            isSubtypeOf(t3, numTypeQuestion)) {
+        // Notes:
+        // - We don't have to check T1 for Never because if T1 is Never, the
+        //   method element will fail to resolve so we'll never reach here.
+        // - We actually check against `num?` rather than `num`.  It's
+        //   equivalent from the standpoint of correctness (since it's illegal
+        //   to call `num.clamp` on a nullable type or to pass it a nullable
+        //   type as an argument, and that's checked for elsewhere), but better
+        //   from the standpoint of error recovery (since it allows e.g.
+        //   `int?.clamp(int, int)` to resolve to `int` rather than `num`).
+        // - We don't check that T2 and T3 are subtypes of num because the
+        //   signature of `num.clamp` requires it.
+        var numTypeQuestion = typeProvider.numTypeQuestion;
+        if (isSubtypeOf(t1, numTypeQuestion) && !t2.isBottom && !t3.isBottom) {
+          assert(!t1.isBottom);
+          assert(isSubtypeOf(t2, numTypeQuestion));
+          assert(isSubtypeOf(t3, numTypeQuestion));
           // Then:
           // - If T1, T2 and T3 are all subtypes of int, the static type of e is
           //   int.
           // (Note: as above, we check against `int?` because it's equivalent
           // and leads to better error recovery.)
-          var intType = typeProvider.intType;
-          var intTypeQuestion = makeNullable(intType as InterfaceTypeImpl);
+          var intTypeQuestion = typeProvider.intTypeQuestion;
           if (isSubtypeOf(t1, intTypeQuestion) &&
               isSubtypeOf(t2, intTypeQuestion) &&
               isSubtypeOf(t3, intTypeQuestion)) {
-            return intType;
+            return typeProvider.intType;
           }
           // If T1, T2 and T3 are all subtypes of double, the static type of e
           // is double.
           // (As above, we check against `double?` for error recovery.)
-          var doubleType = typeProvider.doubleType;
-          var doubleTypeQuestion =
-              makeNullable(doubleType as InterfaceTypeImpl);
+          var doubleTypeQuestion = typeProvider.doubleTypeQuestion;
           if (isSubtypeOf(t1, doubleTypeQuestion) &&
               isSubtypeOf(t2, doubleTypeQuestion) &&
               isSubtypeOf(t3, doubleTypeQuestion)) {
-            return doubleType;
+            return typeProvider.doubleType;
           }
           // Otherwise the static type of e is num.
-          return numType;
+          return typeProvider.numType;
         }
       }
     }
diff --git a/pkg/analyzer/lib/src/dart/error/hint_codes.dart b/pkg/analyzer/lib/src/dart/error/hint_codes.dart
index b9ce65f..f413987 100644
--- a/pkg/analyzer/lib/src/dart/error/hint_codes.dart
+++ b/pkg/analyzer/lib/src/dart/error/hint_codes.dart
@@ -560,6 +560,15 @@
       correction: "Try specifying the type of the parameter.");
 
   /**
+   * Parameters:
+   * 0: the name of the annotation
+   * 1: the list of valid targets
+   */
+  static const HintCode INVALID_ANNOTATION_TARGET = HintCode(
+      'INVALID_ANNOTATION_TARGET',
+      "The annotation '{0}' can only be used on {1}");
+
+  /**
    * This hint is generated anywhere a @factory annotation is associated with
    * anything other than a method.
    */
diff --git a/pkg/analyzer/lib/src/dart/resolver/binary_expression_resolver.dart b/pkg/analyzer/lib/src/dart/resolver/binary_expression_resolver.dart
index ccc0ab7..669d189 100644
--- a/pkg/analyzer/lib/src/dart/resolver/binary_expression_resolver.dart
+++ b/pkg/analyzer/lib/src/dart/resolver/binary_expression_resolver.dart
@@ -270,6 +270,7 @@
     var right = node.rightOperand;
 
     left.accept(_resolver);
+    left = node.leftOperand; // In case it was rewritten
 
     var operator = node.operator;
     _resolveUserDefinableElement(node, operator.lexeme);
@@ -279,7 +280,13 @@
       // If this is a user-defined operator, set the right operand context
       // using the operator method's parameter type.
       var rightParam = invokeType.parameters[0];
-      InferenceContext.setType(right, rightParam.type);
+      InferenceContext.setType(
+          right,
+          _typeSystem.refineNumericInvocationContext(
+              left.staticType,
+              node.staticElement,
+              InferenceContext.getContext(node),
+              rightParam.type));
     }
 
     right.accept(_resolver);
diff --git a/pkg/analyzer/lib/src/dart/resolver/invocation_inference_helper.dart b/pkg/analyzer/lib/src/dart/resolver/invocation_inference_helper.dart
index d6f416c..2329df1 100644
--- a/pkg/analyzer/lib/src/dart/resolver/invocation_inference_helper.dart
+++ b/pkg/analyzer/lib/src/dart/resolver/invocation_inference_helper.dart
@@ -265,7 +265,11 @@
     node.typeArgumentTypes = _typeArgumentTypes;
     node.staticInvokeType = _invokeType;
 
-    var returnType = computeInvokeReturnType(_invokeType);
+    var returnType = _typeSystem.refineNumericInvocationType(
+        node.realTarget?.staticType,
+        node.methodName.staticElement,
+        [for (var argument in node.argumentList.arguments) argument.staticType],
+        computeInvokeReturnType(_invokeType));
     recordStaticType(node, returnType);
   }
 
diff --git a/pkg/analyzer/lib/src/dart/resolver/postfix_expression_resolver.dart b/pkg/analyzer/lib/src/dart/resolver/postfix_expression_resolver.dart
index 545a141..6468d25 100644
--- a/pkg/analyzer/lib/src/dart/resolver/postfix_expression_resolver.dart
+++ b/pkg/analyzer/lib/src/dart/resolver/postfix_expression_resolver.dart
@@ -10,6 +10,7 @@
 import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/type_system.dart';
+import 'package:analyzer/src/dart/error/syntactic_errors.dart';
 import 'package:analyzer/src/dart/resolver/assignment_expression_resolver.dart';
 import 'package:analyzer/src/dart/resolver/flow_analysis_visitor.dart';
 import 'package:analyzer/src/dart/resolver/invocation_inference_helper.dart';
@@ -193,6 +194,16 @@
   void _resolveNullCheck(PostfixExpressionImpl node) {
     var operand = node.operand;
 
+    if (operand is SuperExpression) {
+      _resolver.errorReporter.reportErrorForNode(
+        ParserErrorCode.MISSING_ASSIGNABLE_SELECTOR,
+        node,
+      );
+      _inferenceHelper.recordStaticType(operand, DynamicTypeImpl.instance);
+      _inferenceHelper.recordStaticType(node, DynamicTypeImpl.instance);
+      return;
+    }
+
     var contextType = InferenceContext.getContext(node);
     if (contextType != null) {
       if (_isNonNullableByDefault) {
diff --git a/pkg/analyzer/lib/src/error/best_practices_verifier.dart b/pkg/analyzer/lib/src/error/best_practices_verifier.dart
index 6eff16b..43ab1dd 100644
--- a/pkg/analyzer/lib/src/error/best_practices_verifier.dart
+++ b/pkg/analyzer/lib/src/error/best_practices_verifier.dart
@@ -25,15 +25,15 @@
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/lint/linter.dart';
+import 'package:analyzer/src/utilities/extensions/string.dart';
 import 'package:analyzer/src/workspace/workspace.dart';
 import 'package:meta/meta.dart';
+import 'package:meta/meta_meta.dart';
 import 'package:path/path.dart' as path;
 
 /// Instances of the class `BestPracticesVerifier` traverse an AST structure
 /// looking for violations of Dart best practices.
 class BestPracticesVerifier extends RecursiveAstVisitor<void> {
-//  static String _HASHCODE_GETTER_NAME = "hashCode";
-
   static const String _NULL_TYPE_NAME = "Null";
 
   static const String _TO_INT_METHOD_NAME = "toInt";
@@ -115,26 +115,29 @@
   @override
   void visitAnnotation(Annotation node) {
     ElementAnnotation element = node.elementAnnotation;
+    if (element == null) {
+      return;
+    }
     AstNode parent = node.parent;
-    if (element?.isFactory == true) {
+    if (element.isFactory == true) {
       if (parent is MethodDeclaration) {
         _checkForInvalidFactory(parent);
       } else {
         _errorReporter
             .reportErrorForNode(HintCode.INVALID_FACTORY_ANNOTATION, node, []);
       }
-    } else if (element?.isImmutable == true) {
+    } else if (element.isImmutable == true) {
       if (parent is! ClassOrMixinDeclaration && parent is! ClassTypeAlias) {
         _errorReporter.reportErrorForNode(
             HintCode.INVALID_IMMUTABLE_ANNOTATION, node, []);
       }
-    } else if (element?.isLiteral == true) {
+    } else if (element.isLiteral == true) {
       if (parent is! ConstructorDeclaration ||
           (parent as ConstructorDeclaration).constKeyword == null) {
         _errorReporter
             .reportErrorForNode(HintCode.INVALID_LITERAL_ANNOTATION, node, []);
       }
-    } else if (element?.isNonVirtual == true) {
+    } else if (element.isNonVirtual == true) {
       if (parent is FieldDeclaration) {
         if (parent.isStatic) {
           _errorReporter.reportErrorForNode(
@@ -155,13 +158,13 @@
         _errorReporter.reportErrorForNode(
             HintCode.INVALID_NON_VIRTUAL_ANNOTATION, node, [node.element.name]);
       }
-    } else if (element?.isSealed == true) {
+    } else if (element.isSealed == true) {
       if (!(parent is ClassDeclaration || parent is ClassTypeAlias)) {
         _errorReporter.reportErrorForNode(
             HintCode.INVALID_SEALED_ANNOTATION, node, [node.element.name]);
       }
-    } else if (element?.isVisibleForTemplate == true ||
-        element?.isVisibleForTesting == true) {
+    } else if (element.isVisibleForTemplate == true ||
+        element.isVisibleForTesting == true) {
       if (parent is Declaration) {
         void reportInvalidAnnotation(Element declaredElement) {
           _errorReporter.reportErrorForNode(
@@ -192,6 +195,27 @@
         // visibleForTemplate or visibleForTesting, so leave it alone for now.
       }
     }
+    var kinds = _targetKindsFor(element);
+    if (kinds.isNotEmpty) {
+      if (!_isValidTarget(parent, kinds)) {
+        var invokedElement = element.element;
+        var name = invokedElement.name;
+        if (invokedElement is ConstructorElement) {
+          var className = invokedElement.enclosingElement.name;
+          if (name.isEmpty) {
+            name = className;
+          } else {
+            name = '$className.$name';
+          }
+        }
+        var kindNames = kinds.map((kind) => kind.displayString).toList()
+          ..sort();
+        var validKinds = kindNames.commaSeparatedWithOr;
+        _errorReporter.reportErrorForNode(
+            HintCode.INVALID_ANNOTATION_TARGET, node.name, [name, validKinds]);
+        return;
+      }
+    }
 
     super.visitAnnotation(node);
   }
@@ -1394,6 +1418,80 @@
     return _workspacePackage.contains(library.source);
   }
 
+  /// Return `true` if it is valid to have an annotation on the given [target]
+  /// when the annotation is marked as being valid for the given [kinds] of
+  /// targets.
+  bool _isValidTarget(AstNode target, Set<TargetKind> kinds) {
+    if (target is ClassDeclaration) {
+      return kinds.contains(TargetKind.classType) ||
+          kinds.contains(TargetKind.type);
+    } else if (target is Directive) {
+      return (target.parent as CompilationUnit).directives.first == target &&
+          kinds.contains(TargetKind.library);
+    } else if (target is EnumDeclaration) {
+      return kinds.contains(TargetKind.enumType) ||
+          kinds.contains(TargetKind.type);
+    } else if (target is ExtensionDeclaration) {
+      return kinds.contains(TargetKind.extension);
+    } else if (target is FieldDeclaration) {
+      return kinds.contains(TargetKind.field);
+    } else if (target is FunctionDeclaration) {
+      if (target.isGetter) {
+        return kinds.contains(TargetKind.getter);
+      }
+      if (target.isSetter) {
+        return kinds.contains(TargetKind.setter);
+      }
+      return kinds.contains(TargetKind.function);
+    } else if (target is MethodDeclaration) {
+      if (target.isGetter) {
+        return kinds.contains(TargetKind.getter);
+      }
+      if (target.isSetter) {
+        return kinds.contains(TargetKind.setter);
+      }
+      return kinds.contains(TargetKind.method);
+    } else if (target is MixinDeclaration) {
+      return kinds.contains(TargetKind.mixinType) ||
+          kinds.contains(TargetKind.type);
+    } else if (target is FormalParameter) {
+      return kinds.contains(TargetKind.parameter);
+    } else if (target is FunctionTypeAlias || target is GenericTypeAlias) {
+      return kinds.contains(TargetKind.typedefType) ||
+          kinds.contains(TargetKind.type);
+    }
+    return false;
+  }
+
+  /// Return the target kinds defined for the given [annotation].
+  Set<TargetKind> _targetKindsFor(ElementAnnotation annotation) {
+    var element = annotation.element;
+    ClassElement classElement;
+    if (element is VariableElement) {
+      var type = element.type;
+      if (type is InterfaceType) {
+        classElement = type.element;
+      }
+    } else if (element is ConstructorElement) {
+      classElement = element.enclosingElement;
+    }
+    if (classElement == null) {
+      return const <TargetKind>{};
+    }
+    for (var annotation in classElement.metadata) {
+      if (annotation.isTarget) {
+        var value = annotation.constantValue;
+        var kinds = <TargetKind>{};
+        for (var kindObject in value.getField('kinds').toSetValue()) {
+          var index = kindObject.getField('index').toIntValue();
+          kinds.add(TargetKind.values[index]);
+        }
+        return kinds;
+      }
+    }
+    return const <TargetKind>{};
+  }
+
   /// Checks for the passed as expression for the [HintCode.UNNECESSARY_CAST]
   /// hint code.
   ///
@@ -1709,3 +1807,38 @@
     }
   }
 }
+
+extension on TargetKind {
+  /// Return a user visible string used to describe this target kind.
+  String get displayString {
+    switch (this) {
+      case TargetKind.classType:
+        return 'classes';
+      case TargetKind.enumType:
+        return 'enums';
+      case TargetKind.extension:
+        return 'extensions';
+      case TargetKind.field:
+        return 'fields';
+      case TargetKind.function:
+        return 'top-level functions';
+      case TargetKind.library:
+        return 'librarys';
+      case TargetKind.getter:
+        return 'getters';
+      case TargetKind.method:
+        return 'methods';
+      case TargetKind.mixinType:
+        return 'mixins';
+      case TargetKind.parameter:
+        return 'parameters';
+      case TargetKind.setter:
+        return 'setters';
+      case TargetKind.type:
+        return 'types (classes, enums, mixins, or typedefs)';
+      case TargetKind.typedefType:
+        return 'typedefs';
+    }
+    throw 'Remove this when this library is converted to null-safety';
+  }
+}
diff --git a/pkg/analyzer/lib/src/error/codes.dart b/pkg/analyzer/lib/src/error/codes.dart
index 047d328..56baebc 100644
--- a/pkg/analyzer/lib/src/error/codes.dart
+++ b/pkg/analyzer/lib/src/error/codes.dart
@@ -10358,6 +10358,88 @@
 }
 
 /**
+ * This class has experimental Language-specific codes.
+ *
+ * Currently it only contains codes related to implicit dynamic.
+ */
+class LanguageCode extends ErrorCode {
+  /**
+   * This is appended to the end of an error message about implicit dynamic.
+   *
+   * The idea is to make sure the user is aware that this error message is the
+   * result of turning on a particular option, and they are free to turn it
+   * back off.
+   */
+  static const String _implicitDynamicCorrection =
+      "Try adding an explicit type, or remove implicit-dynamic from your "
+      "analysis options file.";
+
+  static const LanguageCode IMPLICIT_DYNAMIC_FIELD = LanguageCode(
+      'IMPLICIT_DYNAMIC_FIELD', "Missing field type for '{0}'.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_FUNCTION = LanguageCode(
+      'IMPLICIT_DYNAMIC_FUNCTION',
+      "Missing type arguments for generic function '{0}<{1}>'.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_INVOKE = LanguageCode(
+      'IMPLICIT_DYNAMIC_INVOKE',
+      "Missing type arguments for calling generic function type '{0}'.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_LIST_LITERAL = LanguageCode(
+      'IMPLICIT_DYNAMIC_LIST_LITERAL',
+      "Missing type argument for list literal.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_MAP_LITERAL = LanguageCode(
+      'IMPLICIT_DYNAMIC_MAP_LITERAL', "Missing type arguments for map literal.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_METHOD = LanguageCode(
+      'IMPLICIT_DYNAMIC_METHOD',
+      "Missing type arguments for generic method '{0}<{1}>'.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_PARAMETER = LanguageCode(
+      'IMPLICIT_DYNAMIC_PARAMETER', "Missing parameter type for '{0}'.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_RETURN = LanguageCode(
+      'IMPLICIT_DYNAMIC_RETURN', "Missing return type for '{0}'.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_TYPE = LanguageCode(
+      'IMPLICIT_DYNAMIC_TYPE', "Missing type arguments for generic type '{0}'.",
+      correction: _implicitDynamicCorrection);
+
+  static const LanguageCode IMPLICIT_DYNAMIC_VARIABLE = LanguageCode(
+      'IMPLICIT_DYNAMIC_VARIABLE', "Missing variable type for '{0}'.",
+      correction: _implicitDynamicCorrection);
+
+  @override
+  final ErrorType type = ErrorType.COMPILE_TIME_ERROR;
+
+  /**
+   * Initialize a newly created language code to have the given [type] and
+   * [name].
+   *
+   * The message associated with the code will be created from the given
+   * [message] template. The correction associated with the code will be
+   * created from the optional [correction] template.
+   */
+  const LanguageCode(String name, String message,
+      {String correction, bool hasPublishedDocs})
+      : super.temporary(name, message,
+            correction: correction,
+            hasPublishedDocs: hasPublishedDocs ?? false);
+
+  @override
+  ErrorSeverity get errorSeverity => type.severity;
+}
+
+/**
  * The error codes used for static warnings. The convention for this class is
  * for the name of the error code to indicate the problem that caused the error
  * to be generated and for the error message to explain what is wrong and, when
@@ -10699,77 +10781,6 @@
  * levels, so they are grouped for clarity.
  */
 class StrongModeCode extends ErrorCode {
-  /**
-   * This is appended to the end of an error message about implicit dynamic.
-   *
-   * The idea is to make sure the user is aware that this error message is the
-   * result of turning on a particular option, and they are free to turn it
-   * back off.
-   */
-  static const String _implicitDynamicCorrection =
-      "Try adding an explicit type like 'dynamic', or "
-      "enable implicit-dynamic in your analysis options file.";
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_FIELD = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_FIELD',
-      "Missing field type for '{0}'.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_FUNCTION = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_FUNCTION',
-      "Missing type arguments for generic function '{0}<{1}>'.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_INVOKE = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_INVOKE',
-      "Missing type arguments for calling generic function type '{0}'.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_LIST_LITERAL = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_LIST_LITERAL',
-      "Missing type argument for list literal.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_MAP_LITERAL = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_MAP_LITERAL',
-      "Missing type arguments for map literal.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_METHOD = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_METHOD',
-      "Missing type arguments for generic method '{0}<{1}>'.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_PARAMETER = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_PARAMETER',
-      "Missing parameter type for '{0}'.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_RETURN = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_RETURN',
-      "Missing return type for '{0}'.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_TYPE = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_TYPE',
-      "Missing type arguments for generic type '{0}'.",
-      correction: _implicitDynamicCorrection);
-
-  static const StrongModeCode IMPLICIT_DYNAMIC_VARIABLE = StrongModeCode(
-      ErrorType.COMPILE_TIME_ERROR,
-      'IMPLICIT_DYNAMIC_VARIABLE',
-      "Missing variable type for '{0}'.",
-      correction: _implicitDynamicCorrection);
-
   /*
    * TODO(brianwilkerson) Make the TOP_LEVEL_ error codes be errors rather than
    * hints and then clean up the function _errorSeverity in
diff --git a/pkg/analyzer/lib/src/error/type_arguments_verifier.dart b/pkg/analyzer/lib/src/error/type_arguments_verifier.dart
index ecf7baa..f43fffa 100644
--- a/pkg/analyzer/lib/src/error/type_arguments_verifier.dart
+++ b/pkg/analyzer/lib/src/error/type_arguments_verifier.dart
@@ -111,7 +111,7 @@
           Element element = function.staticElement;
           if (element is MethodElement) {
             _errorReporter.reportErrorForNode(
-                StrongModeCode.IMPLICIT_DYNAMIC_METHOD,
+                LanguageCode.IMPLICIT_DYNAMIC_METHOD,
                 node.function,
                 [element.displayName, element.typeParameters.join(', ')]);
             return;
@@ -119,7 +119,7 @@
 
           if (element is FunctionElement) {
             _errorReporter.reportErrorForNode(
-                StrongModeCode.IMPLICIT_DYNAMIC_FUNCTION,
+                LanguageCode.IMPLICIT_DYNAMIC_FUNCTION,
                 node.function,
                 [element.displayName, element.typeParameters.join(', ')]);
             return;
@@ -128,10 +128,8 @@
 
         // The catch all case if neither of those matched.
         // For example, invoking a function expression.
-        _errorReporter.reportErrorForNode(
-            StrongModeCode.IMPLICIT_DYNAMIC_INVOKE,
-            node.function,
-            [declaredType]);
+        _errorReporter.reportErrorForNode(LanguageCode.IMPLICIT_DYNAMIC_INVOKE,
+            node.function, [declaredType]);
       }
     }
   }
@@ -145,8 +143,8 @@
     if (type is InterfaceType && type.typeArguments.any((t) => t.isDynamic)) {
       // TODO(brianwilkerson) Add StrongModeCode.IMPLICIT_DYNAMIC_SET_LITERAL
       ErrorCode errorCode = node is ListLiteral
-          ? StrongModeCode.IMPLICIT_DYNAMIC_LIST_LITERAL
-          : StrongModeCode.IMPLICIT_DYNAMIC_MAP_LITERAL;
+          ? LanguageCode.IMPLICIT_DYNAMIC_LIST_LITERAL
+          : LanguageCode.IMPLICIT_DYNAMIC_MAP_LITERAL;
       _errorReporter.reportErrorForNode(errorCode, node);
     }
   }
diff --git a/pkg/analyzer/lib/src/generated/error_verifier.dart b/pkg/analyzer/lib/src/generated/error_verifier.dart
index 58cb764..0a9d266 100644
--- a/pkg/analyzer/lib/src/generated/error_verifier.dart
+++ b/pkg/analyzer/lib/src/generated/error_verifier.dart
@@ -773,7 +773,7 @@
         if (parameterType is FunctionType &&
             parameterType.returnType.isDynamic) {
           _errorReporter.reportErrorForNode(
-              StrongModeCode.IMPLICIT_DYNAMIC_RETURN,
+              LanguageCode.IMPLICIT_DYNAMIC_RETURN,
               node.identifier,
               [node.identifier]);
         }
@@ -2722,11 +2722,11 @@
         variable.type.isDynamic) {
       ErrorCode errorCode;
       if (variable is FieldElement) {
-        errorCode = StrongModeCode.IMPLICIT_DYNAMIC_FIELD;
+        errorCode = LanguageCode.IMPLICIT_DYNAMIC_FIELD;
       } else if (variable is ParameterElement) {
-        errorCode = StrongModeCode.IMPLICIT_DYNAMIC_PARAMETER;
+        errorCode = LanguageCode.IMPLICIT_DYNAMIC_PARAMETER;
       } else {
-        errorCode = StrongModeCode.IMPLICIT_DYNAMIC_VARIABLE;
+        errorCode = LanguageCode.IMPLICIT_DYNAMIC_VARIABLE;
       }
       _errorReporter.reportErrorForNode(errorCode, node, [id]);
     }
@@ -2743,7 +2743,7 @@
     if (element != null &&
         element.hasImplicitReturnType &&
         element.returnType.isDynamic) {
-      _errorReporter.reportErrorForNode(StrongModeCode.IMPLICIT_DYNAMIC_RETURN,
+      _errorReporter.reportErrorForNode(LanguageCode.IMPLICIT_DYNAMIC_RETURN,
           functionName, [element.displayName]);
     }
   }
@@ -2758,8 +2758,8 @@
     if (type is ParameterizedType &&
         type.typeArguments.isNotEmpty &&
         type.typeArguments.any((t) => t.isDynamic)) {
-      _errorReporter.reportErrorForNode(
-          StrongModeCode.IMPLICIT_DYNAMIC_TYPE, node, [type]);
+      _errorReporter
+          .reportErrorForNode(LanguageCode.IMPLICIT_DYNAMIC_TYPE, node, [type]);
     }
   }
 
@@ -4323,6 +4323,10 @@
       return;
     }
 
+    if (target is SuperExpression) {
+      return;
+    }
+
     ErrorCode errorCode;
     Token endToken = operator;
     List<Object> arguments = const [];
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index 3b5fb67..ab23325 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -635,13 +635,25 @@
           positional.skip(normalCount).take(optionalCount);
       Iterable<Expression> named =
           arguments.skipWhile((l) => l is! NamedExpression);
+      var parent = node.parent;
+      DartType targetType;
+      Element methodElement;
+      DartType invocationContext;
+      if (parent is MethodInvocation) {
+        targetType = parent.realTarget?.staticType;
+        methodElement = parent.methodName.staticElement;
+        invocationContext = InferenceContext.getContext(parent);
+      }
 
       //TODO(leafp): Consider using the parameter elements here instead.
       //TODO(leafp): Make sure that the parameter elements are getting
       // setup correctly with inference.
       int index = 0;
       for (Expression argument in required) {
-        InferenceContext.setType(argument, normalParameterTypes[index++]);
+        InferenceContext.setType(
+            argument,
+            typeSystem.refineNumericInvocationContext(targetType, methodElement,
+                invocationContext, normalParameterTypes[index++]));
       }
       index = 0;
       for (Expression argument in optional) {
diff --git a/pkg/analyzer/lib/src/test_utilities/mock_packages.dart b/pkg/analyzer/lib/src/test_utilities/mock_packages.dart
index 28eeeae..edc7bd4 100644
--- a/pkg/analyzer/lib/src/test_utilities/mock_packages.dart
+++ b/pkg/analyzer/lib/src/test_utilities/mock_packages.dart
@@ -72,5 +72,28 @@
   const _VisibleForTesting();
 }
 ''');
+    libFolder.getChildAssumingFile('meta_meta.dart').writeAsStringSync(r'''
+library meta_meta;
+
+class Target {
+  final Set<TargetKind> kinds;
+  const Target(this.kinds);
+}
+enum TargetKind {
+  classType,
+  enumType,
+  extension,
+  field,
+  function,
+  library,
+  getter,
+  method,
+  mixinType,
+  parameter,
+  setter,
+  type,
+  typedefType,
+}
+''');
   }
 }
diff --git a/pkg/analyzer/lib/src/test_utilities/mock_sdk.dart b/pkg/analyzer/lib/src/test_utilities/mock_sdk.dart
index 1807d8d..a4ebb6e 100644
--- a/pkg/analyzer/lib/src/test_utilities/mock_sdk.dart
+++ b/pkg/analyzer/lib/src/test_utilities/mock_sdk.dart
@@ -478,7 +478,9 @@
   int operator ~/(num other);
 
   num abs();
+  num clamp(num lowerLimit, num upperLimit);
   int floor();
+  num remainder(num other);
   int round();
   double toDouble();
   int toInt();
diff --git a/pkg/analyzer/lib/src/utilities/extensions/string.dart b/pkg/analyzer/lib/src/utilities/extensions/string.dart
new file mode 100644
index 0000000..d583029
--- /dev/null
+++ b/pkg/analyzer/lib/src/utilities/extensions/string.dart
@@ -0,0 +1,38 @@
+// Copyright (c) 2020, 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.
+
+extension ListOfStringExtension on List<String> {
+  /// Produce a comma-separated representation of this list, with the last
+  /// element preceded by 'and' when there are more than two elements in this
+  /// list.
+  String get commaSeparatedWithAnd => _commaSeparated('and');
+
+  /// Produce a comma-separated representation of this list, with the last
+  /// element preceded by 'or' when there are more than two elements in this
+  /// list.
+  String get commaSeparatedWithOr => _commaSeparated('or');
+
+  /// Produce a comma-separated representation of this list, with the last
+  /// element preceded by the [conjunction] when there are more than two
+  /// elements in this list.
+  String _commaSeparated(String conjunction) {
+    if (length == 0) {
+      return '';
+    } else if (length == 1) {
+      return this[0];
+    } else if (length == 2) {
+      return '${this[0]} $conjunction ${this[1]}';
+    } else {
+      var buffer = StringBuffer();
+      for (int i = 0; i < length - 1; i++) {
+        buffer.write(this[i]);
+        buffer.write(', ');
+      }
+      buffer.write(conjunction);
+      buffer.write(' ');
+      buffer.write(this[length - 1]);
+      return buffer.toString();
+    }
+  }
+}
diff --git a/pkg/analyzer/test/src/dart/resolution/binary_expression_test.dart b/pkg/analyzer/test/src/dart/resolution/binary_expression_test.dart
index 482672b..10c2bac 100644
--- a/pkg/analyzer/test/src/dart/resolution/binary_expression_test.dart
+++ b/pkg/analyzer/test/src/dart/resolution/binary_expression_test.dart
@@ -4,6 +4,7 @@
 
 import 'package:analyzer/src/dart/error/hint_codes.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
+import 'package:analyzer/src/error/codes.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ -117,6 +118,19 @@
     );
   }
 
+  test_minus_int_context_int() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  h(a - f());
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+  }
+
   test_minus_int_double() async {
     await assertNoErrorsInCode(r'''
 f(int a, double b) {
@@ -151,6 +165,19 @@
     );
   }
 
+  test_mod_int_context_int() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  h(a % f());
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+  }
+
   test_mod_int_double() async {
     await assertNoErrorsInCode(r'''
 f(int a, double b) {
@@ -185,6 +212,43 @@
     );
   }
 
+  test_plus_double_context_double() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(double a) {
+  h(a + f());
+}
+h(double x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_plus_double_context_int() async {
+    await assertErrorsInCode('''
+T f<T>() => throw Error();
+g(double a) {
+  h(a + f());
+}
+h(int x) {}
+''', [
+      error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 45, 7),
+    ]);
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_plus_double_context_none() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(double a) {
+  a + f();
+}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
   test_plus_double_dynamic() async {
     await assertNoErrorsInCode(r'''
 f(double a, dynamic b) {
@@ -202,6 +266,74 @@
     );
   }
 
+  test_plus_int_context_double() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  h(a + f());
+}
+h(double x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'),
+        [typeToStringWithNullability ? 'double' : 'num']);
+  }
+
+  test_plus_int_context_int() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  h(a + f());
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+  }
+
+  test_plus_int_context_int_target_rewritten() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int Function() a) {
+  h(a() + f());
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+  }
+
+  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/43114')
+  test_plus_int_context_int_via_extension_explicit() async {
+    await assertErrorsInCode('''
+extension E on int {
+  String operator+(num x) => '';
+}
+T f<T>() => throw Error();
+g(int a) {
+  h(E(a) + f());
+}
+h(int x) {}
+''', [
+      error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 98, 10),
+    ]);
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_plus_int_context_none() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  a + f();
+}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
   test_plus_int_double() async {
     await assertNoErrorsInCode(r'''
 f(int a, double b) {
@@ -308,6 +440,78 @@
     );
   }
 
+  test_plus_num_context_int() async {
+    await assertErrorsInCode(
+        '''
+T f<T>() => throw Error();
+g(num a) {
+  h(a + f());
+}
+h(int x) {}
+''',
+        expectedErrorsByNullability(nullable: [
+          error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 42, 7),
+        ], legacy: []));
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_plus_other_context_int() async {
+    await assertErrorsInCode(
+        '''
+abstract class A {
+  num operator+(String x);
+}
+T f<T>() => throw Error();
+g(A a) {
+  h(a + f());
+}
+h(int x) {}
+''',
+        expectedErrorsByNullability(nullable: [
+          error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 88, 7),
+        ], legacy: []));
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['String']);
+  }
+
+  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/43114')
+  test_plus_other_context_int_via_extension_explicit() async {
+    await assertErrorsInCode('''
+class A {}
+extension E on A {
+  String operator+(num x) => '';
+}
+T f<T>() => throw Error();
+g(A a) {
+  h(E(a) + f());
+}
+h(int x) {}
+''', [
+      error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 105, 10),
+    ]);
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_plus_other_context_int_via_extension_implicit() async {
+    await assertErrorsInCode('''
+class A {}
+extension E on A {
+  String operator+(num x) => '';
+}
+T f<T>() => throw Error();
+g(A a) {
+  h(a + f());
+}
+h(int x) {}
+''', [
+      error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 105, 7),
+    ]);
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
   test_plus_other_double() async {
     await assertNoErrorsInCode('''
 abstract class A {
@@ -419,6 +623,19 @@
     );
   }
 
+  test_star_int_context_int() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  h(a * f());
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+  }
+
   test_star_int_double() async {
     await assertNoErrorsInCode(r'''
 f(int a, double b) {
diff --git a/pkg/analyzer/test/src/dart/resolution/method_invocation_test.dart b/pkg/analyzer/test/src/dart/resolution/method_invocation_test.dart
index 7793c22..e9936dd 100644
--- a/pkg/analyzer/test/src/dart/resolution/method_invocation_test.dart
+++ b/pkg/analyzer/test/src/dart/resolution/method_invocation_test.dart
@@ -6,6 +6,7 @@
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
 import 'package:analyzer/src/error/codes.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'context_collection_resolution.dart';
@@ -22,6 +23,376 @@
     with MethodInvocationResolutionTestCases {}
 
 mixin MethodInvocationResolutionTestCases on PubPackageResolutionTest {
+  test_clamp_double_context_double() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(double a) {
+  h(a.clamp(f(), f()));
+}
+h(double x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f(),'),
+        [typeToStringWithNullability ? 'double' : 'num']);
+    assertTypeArgumentTypes(findNode.methodInvocation('f())'),
+        [typeToStringWithNullability ? 'double' : 'num']);
+  }
+
+  test_clamp_double_context_int() async {
+    await assertErrorsInCode(
+        '''
+T f<T>() => throw Error();
+g(double a) {
+  h(a.clamp(f(), f()));
+}
+h(int x) {}
+''',
+        expectedErrorsByNullability(nullable: [
+          error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 45, 17),
+        ], legacy: []));
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f(),'), ['num']);
+    assertTypeArgumentTypes(findNode.methodInvocation('f())'), ['num']);
+  }
+
+  test_clamp_double_context_none() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(double a) {
+  a.clamp(f(), f());
+}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f(),'), ['num']);
+    assertTypeArgumentTypes(findNode.methodInvocation('f())'), ['num']);
+  }
+
+  test_clamp_double_double_double() async {
+    await assertNoErrorsInCode('''
+f(double a, double b, double c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: typeToStringWithNullability ? 'double' : 'num');
+  }
+
+  test_clamp_double_double_int() async {
+    await assertNoErrorsInCode('''
+f(double a, double b, int c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: 'num');
+  }
+
+  test_clamp_double_int_double() async {
+    await assertNoErrorsInCode('''
+f(double a, int b, double c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: 'num');
+  }
+
+  test_clamp_double_int_int() async {
+    await assertNoErrorsInCode('''
+f(double a, int b, int c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: 'num');
+  }
+
+  test_clamp_int_context_double() async {
+    await assertErrorsInCode(
+        '''
+T f<T>() => throw Error();
+g(int a) {
+  h(a.clamp(f(), f()));
+}
+h(double x) {}
+''',
+        expectedErrorsByNullability(nullable: [
+          error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 42, 17),
+        ], legacy: []));
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f(),'), ['num']);
+    assertTypeArgumentTypes(findNode.methodInvocation('f())'), ['num']);
+  }
+
+  test_clamp_int_context_int() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  h(a.clamp(f(), f()));
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f(),'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+    assertTypeArgumentTypes(findNode.methodInvocation('f())'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+  }
+
+  test_clamp_int_context_none() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  a.clamp(f(), f());
+}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f(),'), ['num']);
+    assertTypeArgumentTypes(findNode.methodInvocation('f())'), ['num']);
+  }
+
+  test_clamp_int_double_double() async {
+    await assertNoErrorsInCode('''
+f(int a, double b, double c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: 'num');
+  }
+
+  test_clamp_int_double_int() async {
+    await assertNoErrorsInCode('''
+f(int a, double b, int c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: 'num');
+  }
+
+  test_clamp_int_int_double() async {
+    await assertNoErrorsInCode('''
+f(int a, int b, double c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: 'num');
+  }
+
+  test_clamp_int_int_int() async {
+    await assertNoErrorsInCode('''
+f(int a, int b, int c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: typeToStringWithNullability ? 'int' : 'num');
+  }
+
+  test_clamp_int_int_int_from_cascade() async {
+    await assertErrorsInCode(
+        '''
+f(int a, int b, int c) {
+  a..clamp(b, c).isEven;
+}
+''',
+        expectedErrorsByNullability(nullable: [], legacy: [
+          error(CompileTimeErrorCode.UNDEFINED_GETTER, 42, 6),
+        ]));
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: typeToStringWithNullability ? 'int' : 'num');
+  }
+
+  test_clamp_int_int_int_via_extension_explicit() async {
+    await assertNoErrorsInCode('''
+extension E on int {
+  String clamp(int x, int y) => '';
+}
+f(int a, int b, int c) {
+  E(a).clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp(b'),
+        elementMatcher(findElement.extension_('E').getMethod('clamp')),
+        'String Function(int, int)',
+        expectedType: 'String');
+  }
+
+  test_clamp_int_int_never() async {
+    await assertNoErrorsInCode('''
+f(int a, int b, Never c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: 'num');
+  }
+
+  test_clamp_int_never_int() async {
+    await assertErrorsInCode(
+        '''
+f(int a, Never b, int c) {
+  a.clamp(b, c);
+}
+''',
+        expectedErrorsByNullability(nullable: [
+          error(HintCode.DEAD_CODE, 40, 3),
+        ], legacy: []));
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'),
+        elementMatcher(numElement.getMethod('clamp'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num, num)',
+        expectedType: 'num');
+  }
+
+  test_clamp_never_int_int() async {
+    await assertErrorsInCode(
+        '''
+f(Never a, int b, int c) {
+  a.clamp(b, c);
+}
+''',
+        expectedErrorsByNullability(nullable: [
+          error(HintCode.RECEIVER_OF_TYPE_NEVER, 29, 1),
+          error(HintCode.DEAD_CODE, 36, 7),
+        ], legacy: [
+          error(CompileTimeErrorCode.UNDEFINED_METHOD, 31, 5),
+        ]));
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp'), isNull, 'dynamic',
+        expectedType: typeToStringWithNullability ? 'Never' : 'dynamic');
+  }
+
+  test_clamp_other_context_int() async {
+    await assertErrorsInCode(
+        '''
+abstract class A {
+  num clamp(String x, String y);
+}
+T f<T>() => throw Error();
+g(A a) {
+  h(a.clamp(f(), f()));
+}
+h(int x) {}
+''',
+        expectedErrorsByNullability(nullable: [
+          error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 94, 17),
+        ], legacy: []));
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f(),'), ['String']);
+    assertTypeArgumentTypes(findNode.methodInvocation('f())'), ['String']);
+  }
+
+  test_clamp_other_int_int() async {
+    await assertNoErrorsInCode('''
+abstract class A {
+  String clamp(int x, int y);
+}
+f(A a, int b, int c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp(b'),
+        elementMatcher(findElement.class_('A').getMethod('clamp')),
+        'String Function(int, int)',
+        expectedType: 'String');
+  }
+
+  test_clamp_other_int_int_via_extension_explicit() async {
+    await assertNoErrorsInCode('''
+class A {}
+extension E on A {
+  String clamp(int x, int y) => '';
+}
+f(A a, int b, int c) {
+  E(a).clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp(b'),
+        elementMatcher(findElement.extension_('E').getMethod('clamp')),
+        'String Function(int, int)',
+        expectedType: 'String');
+  }
+
+  test_clamp_other_int_int_via_extension_implicit() async {
+    await assertNoErrorsInCode('''
+class A {}
+extension E on A {
+  String clamp(int x, int y) => '';
+}
+f(A a, int b, int c) {
+  a.clamp(b, c);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('clamp(b'),
+        elementMatcher(findElement.extension_('E').getMethod('clamp')),
+        'String Function(int, int)',
+        expectedType: 'String');
+  }
+
   test_error_ambiguousImport_topFunction() async {
     newFile('$testPackageLibPath/a.dart', content: r'''
 void foo(int _) {}
@@ -1599,6 +1970,153 @@
     );
   }
 
+  test_remainder_int_context_cascaded() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  h(a..remainder(f()));
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_remainder_int_context_int() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  h(a.remainder(f()));
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+  }
+
+  test_remainder_int_context_int_target_rewritten() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int Function() a) {
+  h(a().remainder(f()));
+}
+h(int x) {}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'),
+        [typeToStringWithNullability ? 'int' : 'num']);
+  }
+
+  test_remainder_int_context_int_via_extension_explicit() async {
+    await assertErrorsInCode('''
+extension E on int {
+  String remainder(num x) => '';
+}
+T f<T>() => throw Error();
+g(int a) {
+  h(E(a).remainder(f()));
+}
+h(int x) {}
+''', [
+      error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 98, 19),
+    ]);
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_remainder_int_context_none() async {
+    await assertNoErrorsInCode('''
+T f<T>() => throw Error();
+g(int a) {
+  a.remainder(f());
+}
+''');
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_remainder_int_double() async {
+    await assertNoErrorsInCode('''
+f(int a, double b) {
+  a.remainder(b);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('remainder'),
+        elementMatcher(numElement.getMethod('remainder'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num)',
+        expectedType: typeToStringWithNullability ? 'double' : 'num');
+  }
+
+  test_remainder_int_int() async {
+    await assertNoErrorsInCode('''
+f(int a, int b) {
+  a.remainder(b);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('remainder'),
+        elementMatcher(numElement.getMethod('remainder'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num)',
+        expectedType: typeToStringWithNullability ? 'int' : 'num');
+  }
+
+  test_remainder_int_int_target_rewritten() async {
+    await assertNoErrorsInCode('''
+f(int Function() a, int b) {
+  a().remainder(b);
+}
+''');
+
+    assertMethodInvocation(
+        findNode.methodInvocation('remainder'),
+        elementMatcher(numElement.getMethod('remainder'),
+            isLegacy: isNullSafetySdkAndLegacyLibrary),
+        'num Function(num)',
+        expectedType: typeToStringWithNullability ? 'int' : 'num');
+  }
+
+  test_remainder_other_context_int_via_extension_explicit() async {
+    await assertErrorsInCode('''
+class A {}
+extension E on A {
+  String remainder(num x) => '';
+}
+T f<T>() => throw Error();
+g(A a) {
+  h(E(a).remainder(f()));
+}
+h(int x) {}
+''', [
+      error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 105, 19),
+    ]);
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
+  test_remainder_other_context_int_via_extension_implicit() async {
+    await assertErrorsInCode('''
+class A {}
+extension E on A {
+  String remainder(num x) => '';
+}
+T f<T>() => throw Error();
+g(A a) {
+  h(a.remainder(f()));
+}
+h(int x) {}
+''', [
+      error(CompileTimeErrorCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, 105, 16),
+    ]);
+
+    assertTypeArgumentTypes(findNode.methodInvocation('f()'), ['num']);
+  }
+
   test_syntheticName() async {
     // This code is invalid, and the constructor initializer has a method
     // invocation with a synthetic name. But we should still resolve the
diff --git a/pkg/analyzer/test/src/dart/resolution/postfix_expression_test.dart b/pkg/analyzer/test/src/dart/resolution/postfix_expression_test.dart
index 1fa1328..8c17161 100644
--- a/pkg/analyzer/test/src/dart/resolution/postfix_expression_test.dart
+++ b/pkg/analyzer/test/src/dart/resolution/postfix_expression_test.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analyzer/dart/element/type.dart';
+import 'package:analyzer/src/dart/error/syntactic_errors.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ -239,6 +240,38 @@
     );
   }
 
+  test_nullCheck_superExpression() async {
+    await assertErrorsInCode(r'''
+class A {
+  int foo() => 0;
+}
+
+class B extends A {
+  void bar() {
+    super!.foo();
+  }
+}
+''', [
+      error(ParserErrorCode.MISSING_ASSIGNABLE_SELECTOR, 70, 6),
+    ]);
+
+    assertTypeDynamic(findNode.super_('super!'));
+
+    assertPostfixExpression(
+      findNode.postfix('super!'),
+      element: null,
+      type: 'dynamic',
+    );
+
+    assertMethodInvocation2(
+      findNode.methodInvocation('foo();'),
+      element: null,
+      typeArgumentTypes: [],
+      invokeType: 'dynamic',
+      type: 'dynamic',
+    );
+  }
+
   test_nullCheck_typeParameter() async {
     await assertNoErrorsInCode(r'''
 f<T>(T? x) {
diff --git a/pkg/analyzer/test/src/dart/resolution/resolution.dart b/pkg/analyzer/test/src/dart/resolution/resolution.dart
index 2c2acf8..77da937 100644
--- a/pkg/analyzer/test/src/dart/resolution/resolution.dart
+++ b/pkg/analyzer/test/src/dart/resolution/resolution.dart
@@ -462,7 +462,7 @@
 
   void assertMethodInvocation(
     MethodInvocation invocation,
-    Element expectedElement,
+    Object expectedElement,
     String expectedInvokeType, {
     String expectedMethodNameType,
     String expectedNameType,
@@ -473,7 +473,11 @@
 
     // TODO(scheglov) Check for Member.
     var element = invocation.methodName.staticElement;
-    expect(element?.declaration, same(expectedElement));
+    if (expectedElement is Element) {
+      expect(element?.declaration, same(expectedElement));
+    } else {
+      expect(element, expectedElement);
+    }
 
     // TODO(scheglov) Should we enforce this?
 //    if (expectedNameType == null) {
diff --git a/pkg/analyzer/test/src/diagnostics/invalid_annotation_target_test.dart b/pkg/analyzer/test/src/diagnostics/invalid_annotation_target_test.dart
new file mode 100644
index 0000000..640f51a
--- /dev/null
+++ b/pkg/analyzer/test/src/diagnostics/invalid_annotation_target_test.dart
@@ -0,0 +1,681 @@
+// Copyright (c) 2020, 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.
+
+import 'package:analyzer/src/dart/error/hint_codes.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../dart/resolution/context_collection_resolution.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(InvalidAnnotationTargetTest);
+  });
+}
+
+@reflectiveTest
+class InvalidAnnotationTargetTest extends PubPackageResolutionTest {
+  void test_classType_class() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.classType})
+class A {
+  const A();
+}
+
+@A()
+class C {}
+''');
+  }
+
+  void test_classType_mixin() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.classType})
+class A {
+  const A();
+}
+
+@A()
+mixin M {}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 98, 1),
+    ]);
+  }
+
+  void test_classType_topLevelVariable() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.classType})
+class A {
+  const A();
+}
+
+@A()
+int x = 0;
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 98, 1),
+    ]);
+  }
+
+  void test_enumType_class() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.enumType})
+class A {
+  const A();
+}
+
+@A()
+class C {}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 97, 1),
+    ]);
+  }
+
+  void test_enumType_enum() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.enumType})
+class A {
+  const A();
+}
+
+@A()
+enum E {a, b}
+''');
+  }
+
+  void test_extension_class() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.extension})
+class A {
+  const A();
+}
+
+@A()
+class C {}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 98, 1),
+    ]);
+  }
+
+  void test_extension_extension() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.extension})
+class A {
+  const A();
+}
+
+@A()
+extension on C {}
+class C {}
+''');
+  }
+
+  void test_field_field() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.field})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int f = 0;
+}
+''');
+  }
+
+  void test_function_function() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.function})
+class A {
+  const A();
+}
+
+@A()
+int f(int x) => 0;
+''');
+  }
+
+  void test_function_method() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.function})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int M(int x) => 0;
+}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 109, 1),
+    ]);
+  }
+
+  void test_function_topLevelGetter() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.function})
+class A {
+  const A();
+}
+
+@A()
+int get x => 0;
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 97, 1),
+    ]);
+  }
+
+  void test_function_topLevelSetter() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.function})
+class A {
+  const A();
+}
+
+@A()
+set x(_x) {}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 97, 1),
+    ]);
+  }
+
+  void test_getter_getter() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.getter})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int get x => 0;
+}
+''');
+  }
+
+  void test_getter_method() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.getter})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int m(int x) => x;
+}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 107, 1),
+    ]);
+  }
+
+  void test_getter_setter() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.getter})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  set x(int _x) {}
+}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 107, 1),
+    ]);
+  }
+
+  void test_getter_topLevelGetter() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.getter})
+class A {
+  const A();
+}
+
+@A()
+int get x => 0;
+''');
+  }
+
+  void test_library_class() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.library})
+class A {
+  const A();
+}
+
+@A()
+class C {}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 96, 1),
+    ]);
+  }
+
+  void test_library_import() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+@A()
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.library})
+class A {
+  const A();
+}
+''');
+  }
+
+  void test_library_library() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+@A()
+library test;
+
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.library})
+class A {
+  const A();
+}
+''');
+  }
+
+  void test_method_getter() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.method})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int get x => 0;
+}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 107, 1),
+    ]);
+  }
+
+  void test_method_method() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.method})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int m(int x) => x;
+}
+''');
+  }
+
+  void test_method_operator() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.method})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int operator +(int x) => x;
+}
+''');
+  }
+
+  void test_method_setter() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.method})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  set x(int _x) {}
+}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 107, 1),
+    ]);
+  }
+
+  void test_method_topLevelFunction() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.method})
+class A {
+  const A();
+}
+
+@A()
+int f(int x) => x;
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 95, 1),
+    ]);
+  }
+
+  void test_mixinType_class() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.mixinType})
+class A {
+  const A();
+}
+
+@A()
+class C {}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 98, 1),
+    ]);
+  }
+
+  void test_mixinType_mixin() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.mixinType})
+class A {
+  const A();
+}
+
+@A()
+mixin M {}
+''');
+  }
+
+  void test_multiple_invalid() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.classType, TargetKind.method})
+class A {
+  const A();
+}
+
+@A()
+int x = 0;
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 117, 1),
+    ]);
+  }
+
+  void test_multiple_valid() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.classType, TargetKind.method})
+class A {
+  const A();
+}
+
+@A()
+class C {
+  @A()
+  int m(int x) => x;
+}
+''');
+  }
+
+  void test_parameter_function() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.parameter})
+class A {
+  const A();
+}
+
+@A()
+void f(int x) {}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 98, 1),
+    ]);
+  }
+
+  void test_parameter_parameter() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.parameter})
+class A {
+  const A();
+}
+
+void f(@A() int x) {}
+''');
+  }
+
+  void test_setter_getter() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.setter})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int get x => 0;
+}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 107, 1),
+    ]);
+  }
+
+  void test_setter_method() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.setter})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  int m(int x) => x;
+}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 107, 1),
+    ]);
+  }
+
+  void test_setter_setter() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.setter})
+class A {
+  const A();
+}
+
+class C {
+  @A()
+  set x(int _x) {}
+}
+''');
+  }
+
+  void test_setter_topLevelSetter() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.setter})
+class A {
+  const A();
+}
+
+@A()
+set x(_x) {}
+''');
+  }
+
+  void test_type_class() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.type})
+class A {
+  const A();
+}
+
+@A()
+class C {}
+''');
+  }
+
+  void test_type_enum() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.type})
+class A {
+  const A();
+}
+
+@A()
+enum E {a, b}
+''');
+  }
+
+  void test_type_extension() async {
+    writeTestPackageConfigWithMeta();
+    await assertErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.type})
+class A {
+  const A();
+}
+
+@A()
+extension on C {}
+class C {}
+''', [
+      error(HintCode.INVALID_ANNOTATION_TARGET, 93, 1),
+    ]);
+  }
+
+  void test_type_genericTypeAlias() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.type})
+class A {
+  const A();
+}
+
+@A()
+typedef F = void Function(int);
+''');
+  }
+
+  void test_type_mixin() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.type})
+class A {
+  const A();
+}
+
+@A()
+mixin M {}
+''');
+  }
+
+  void test_typedefType_genericTypeAlias() async {
+    writeTestPackageConfigWithMeta();
+    await assertNoErrorsInCode('''
+import 'package:meta/meta_meta.dart';
+
+@Target({TargetKind.typedefType})
+class A {
+  const A();
+}
+
+@A()
+typedef F = void Function(int);
+''');
+  }
+}
diff --git a/pkg/analyzer/test/src/diagnostics/invalid_null_aware_operator_test.dart b/pkg/analyzer/test/src/diagnostics/invalid_null_aware_operator_test.dart
index 32cefad..3f27eb1 100644
--- a/pkg/analyzer/test/src/diagnostics/invalid_null_aware_operator_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/invalid_null_aware_operator_test.dart
@@ -2,6 +2,7 @@
 // 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.
 
+import 'package:analyzer/src/dart/error/syntactic_errors.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ -383,4 +384,21 @@
       error(CompileTimeErrorCode.PREFIX_IDENTIFIER_NOT_FOLLOWED_BY_DOT, 31, 1),
     ]);
   }
+
+  test_super() async {
+    await assertErrorsInCode('''
+class A {
+  void foo() {}
+}
+
+class B extends A {
+  void bar() {
+    super?.foo();
+  }
+}
+''', [
+      error(ParserErrorCode.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER, 73,
+          2),
+    ]);
+  }
 }
diff --git a/pkg/analyzer/test/src/diagnostics/test_all.dart b/pkg/analyzer/test/src/diagnostics/test_all.dart
index 9d1aa5b..0341386 100644
--- a/pkg/analyzer/test/src/diagnostics/test_all.dart
+++ b/pkg/analyzer/test/src/diagnostics/test_all.dart
@@ -270,6 +270,7 @@
 import 'invalid_annotation_from_deferred_library_test.dart'
     as invalid_annotation_from_deferred_library;
 import 'invalid_annotation_getter_test.dart' as invalid_annotation_getter;
+import 'invalid_annotation_target_test.dart' as invalid_annotation_target;
 import 'invalid_annotation_test.dart' as invalid_annotation;
 import 'invalid_assignment_test.dart' as invalid_assignment;
 import 'invalid_cast_new_expr_test.dart' as invalid_cast_new_expr;
@@ -814,6 +815,7 @@
     invalid_annotation.main();
     invalid_annotation_from_deferred_library.main();
     invalid_annotation_getter.main();
+    invalid_annotation_target.main();
     invalid_assignment.main();
     invalid_cast_new_expr.main();
     invalid_constant.main();
diff --git a/pkg/analyzer/test/src/task/strong/checker_test.dart b/pkg/analyzer/test/src/task/strong/checker_test.dart
index 81b6014..366c696 100644
--- a/pkg/analyzer/test/src/task/strong/checker_test.dart
+++ b/pkg/analyzer/test/src/task/strong/checker_test.dart
@@ -2884,10 +2884,10 @@
   dynamic y1 = (<dynamic>[])[0];
 }
 ''', [
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FIELD, 16, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FIELD, 26, 21),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FIELD, 55, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FIELD, 68, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FIELD, 16, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FIELD, 26, 21),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FIELD, 55, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FIELD, 68, 2),
     ]);
   }
 
@@ -2921,13 +2921,13 @@
 }
 ''', [
       error(HintCode.UNUSED_LOCAL_VARIABLE, 73, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FUNCTION, 78, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FUNCTION, 95, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FUNCTION, 106, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FUNCTION, 167, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FUNCTION, 184, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FUNCTION, 195, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_INVOKE, 214, 15),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FUNCTION, 78, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FUNCTION, 95, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FUNCTION, 106, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FUNCTION, 167, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FUNCTION, 184, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FUNCTION, 195, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_INVOKE, 214, 15),
       error(HintCode.UNNECESSARY_CAST, 269, 9),
     ]);
   }
@@ -2946,10 +2946,10 @@
 List<int> l6 = [];
 var l7 = [42];
 ''', [
-      error(StrongModeCode.IMPLICIT_DYNAMIC_LIST_LITERAL, 9, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_LIST_LITERAL, 23, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_LIST_LITERAL, 46, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_LIST_LITERAL, 75, 6),
+      error(LanguageCode.IMPLICIT_DYNAMIC_LIST_LITERAL, 9, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_LIST_LITERAL, 23, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_LIST_LITERAL, 46, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_LIST_LITERAL, 75, 6),
     ]);
   }
 
@@ -2969,12 +2969,12 @@
 Map<String, String> m8 = {};
 var m9 = {'hi': 'there'};
 ''', [
-      error(StrongModeCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 9, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 22, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 53, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 82, 6),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 99, 16),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 126, 8),
+      error(LanguageCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 9, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 22, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 53, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 82, 6),
+      error(LanguageCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 99, 16),
+      error(LanguageCode.IMPLICIT_DYNAMIC_MAP_LITERAL, 126, 8),
     ]);
   }
 
@@ -3006,12 +3006,12 @@
 }
 ''', [
       error(HintCode.UNUSED_LOCAL_VARIABLE, 137, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_METHOD, 150, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_METHOD, 183, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_METHOD, 202, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_METHOD, 242, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_METHOD, 285, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_METHOD, 309, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_METHOD, 150, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_METHOD, 183, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_METHOD, 202, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_METHOD, 242, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_METHOD, 285, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_METHOD, 309, 1),
     ]);
   }
 
@@ -3048,13 +3048,13 @@
 void ftf0(void x(y)) {}
 void ftf1(void x(int y)) {}
 ''', [
-      error(StrongModeCode.IMPLICIT_DYNAMIC_PARAMETER, 60, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_PARAMETER, 117, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_PARAMETER, 241, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_PARAMETER, 290, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_PARAMETER, 412, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_FIELD, 456, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_PARAMETER, 517, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_PARAMETER, 60, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_PARAMETER, 117, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_PARAMETER, 241, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_PARAMETER, 290, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_PARAMETER, 412, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_FIELD, 456, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_PARAMETER, 517, 1),
     ]);
   }
 
@@ -3094,13 +3094,13 @@
 var fe0 = (int x) => x as dynamic;
 var fe1 = (int x) => x;
 ''', [
-      error(StrongModeCode.IMPLICIT_DYNAMIC_RETURN, 12, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_RETURN, 96, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_RETURN, 12, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_RETURN, 96, 2),
       error(HintCode.UNUSED_ELEMENT, 96, 2),
       error(HintCode.UNUSED_ELEMENT, 126, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_RETURN, 212, 12),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_RETURN, 304, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_RETURN, 373, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_RETURN, 212, 12),
+      error(LanguageCode.IMPLICIT_DYNAMIC_RETURN, 304, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_RETURN, 373, 1),
     ]);
   }
 
@@ -3150,20 +3150,20 @@
   return new A();
 }
 ''', [
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 33, 4),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 93, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 108, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 126, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 148, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 163, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 181, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 33, 4),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 93, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 108, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 126, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 148, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 163, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 181, 1),
       error(HintCode.UNUSED_LOCAL_VARIABLE, 200, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 208, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 208, 1),
       error(HintCode.UNUSED_LOCAL_VARIABLE, 231, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 239, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 239, 1),
       error(HintCode.UNUSED_LOCAL_VARIABLE, 262, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 270, 1),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_TYPE, 288, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 270, 1),
+      error(LanguageCode.IMPLICIT_DYNAMIC_TYPE, 288, 1),
       error(HintCode.UNUSED_LOCAL_VARIABLE, 493, 1),
     ]);
   }
@@ -3177,10 +3177,10 @@
 dynamic y0;
 dynamic y1 = (<dynamic>[])[0];
 ''', [
-      error(StrongModeCode.IMPLICIT_DYNAMIC_VARIABLE, 4, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_VARIABLE, 12, 21),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_VARIABLE, 39, 2),
-      error(StrongModeCode.IMPLICIT_DYNAMIC_VARIABLE, 52, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_VARIABLE, 4, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_VARIABLE, 12, 21),
+      error(LanguageCode.IMPLICIT_DYNAMIC_VARIABLE, 39, 2),
+      error(LanguageCode.IMPLICIT_DYNAMIC_VARIABLE, 52, 2),
     ]);
   }
 
diff --git a/pkg/analyzer/test/src/test_all.dart b/pkg/analyzer/test/src/test_all.dart
index 6fd19dc..fbe501e 100644
--- a/pkg/analyzer/test/src/test_all.dart
+++ b/pkg/analyzer/test/src/test_all.dart
@@ -22,6 +22,7 @@
 import 'summary2/test_all.dart' as summary2;
 import 'task/test_all.dart' as task;
 import 'util/test_all.dart' as util;
+import 'utilities/test_all.dart' as utilities;
 import 'workspace/test_all.dart' as workspace;
 
 main() {
@@ -44,6 +45,7 @@
     summary2.main();
     task.main();
     util.main();
+    utilities.main();
     workspace.main();
   }, name: 'src');
 }
diff --git a/pkg/analyzer/test/src/utilities/extensions/string_test.dart b/pkg/analyzer/test/src/utilities/extensions/string_test.dart
new file mode 100644
index 0000000..2d9d373
--- /dev/null
+++ b/pkg/analyzer/test/src/utilities/extensions/string_test.dart
@@ -0,0 +1,58 @@
+// Copyright (c) 2020, 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.
+
+import 'package:analyzer/src/utilities/extensions/string.dart';
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(ListOfStringExtensionTest);
+  });
+}
+
+@reflectiveTest
+class ListOfStringExtensionTest {
+  void test_commaSeparatedWithAnd_five() {
+    expect(<String>['a', 'b', 'c', 'd', 'e'].commaSeparatedWithAnd,
+        'a, b, c, d, and e');
+  }
+
+  void test_commaSeparatedWithAnd_one() {
+    expect(<String>['a'].commaSeparatedWithAnd, 'a');
+  }
+
+  void test_commaSeparatedWithAnd_three() {
+    expect(<String>['a', 'b', 'c'].commaSeparatedWithAnd, 'a, b, and c');
+  }
+
+  void test_commaSeparatedWithAnd_two() {
+    expect(<String>['a', 'b'].commaSeparatedWithAnd, 'a and b');
+  }
+
+  void test_commaSeparatedWithAnd_zero() {
+    expect(<String>[].commaSeparatedWithOr, isEmpty);
+  }
+
+  void test_commaSeparatedWithOr_five() {
+    expect(<String>['a', 'b', 'c', 'd', 'e'].commaSeparatedWithOr,
+        'a, b, c, d, or e');
+  }
+
+  void test_commaSeparatedWithOr_one() {
+    expect(<String>['a'].commaSeparatedWithOr, 'a');
+  }
+
+  void test_commaSeparatedWithOr_three() {
+    expect(<String>['a', 'b', 'c'].commaSeparatedWithOr, 'a, b, or c');
+  }
+
+  void test_commaSeparatedWithOr_two() {
+    expect(<String>['a', 'b'].commaSeparatedWithOr, 'a or b');
+  }
+
+  void test_commaSeparatedWithOr_zero() {
+    expect(<String>[].commaSeparatedWithOr, isEmpty);
+  }
+}
diff --git a/pkg/analyzer/test/src/utilities/extensions/test_all.dart b/pkg/analyzer/test/src/utilities/extensions/test_all.dart
new file mode 100644
index 0000000..8cb2105
--- /dev/null
+++ b/pkg/analyzer/test/src/utilities/extensions/test_all.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2020, 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.
+
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import 'string_test.dart' as string;
+
+main() {
+  defineReflectiveSuite(() {
+    string.main();
+  }, name: 'extensions');
+}
diff --git a/pkg/analyzer/test/src/utilities/test_all.dart b/pkg/analyzer/test/src/utilities/test_all.dart
new file mode 100644
index 0000000..484dd0d
--- /dev/null
+++ b/pkg/analyzer/test/src/utilities/test_all.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2020, 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.
+
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import 'extensions/test_all.dart' as extensions;
+
+main() {
+  defineReflectiveSuite(() {
+    extensions.main();
+  }, name: 'utilities');
+}
diff --git a/pkg/analyzer_plugin/lib/src/utilities/completion/completion_target.dart b/pkg/analyzer_plugin/lib/src/utilities/completion/completion_target.dart
index 6b93571..b4a9e25 100644
--- a/pkg/analyzer_plugin/lib/src/utilities/completion/completion_target.dart
+++ b/pkg/analyzer_plugin/lib/src/utilities/completion/completion_target.dart
@@ -259,6 +259,8 @@
         executable = invocation.constructorName.staticElement;
       } else if (invocation is MethodInvocation) {
         executable = invocation.methodName.staticElement;
+      } else if (invocation is SuperConstructorInvocation) {
+        executable = invocation.staticElement;
       }
 
       if (executable is ExecutableElement) {
diff --git a/pkg/analyzer_plugin/lib/src/utilities/completion/optype.dart b/pkg/analyzer_plugin/lib/src/utilities/completion/optype.dart
index 7d53182..43c56a1 100644
--- a/pkg/analyzer_plugin/lib/src/utilities/completion/optype.dart
+++ b/pkg/analyzer_plugin/lib/src/utilities/completion/optype.dart
@@ -1135,7 +1135,8 @@
 
   @override
   void visitReturnStatement(ReturnStatement node) {
-    if (identical(entity, node.expression)) {
+    if (identical(entity, node.expression) ||
+        (identical(entity, node.semicolon) && node.expression == null)) {
       optype.completionLocation = 'ReturnStatement_expression';
       optype.includeReturnValueSuggestions = true;
       optype.includeTypeNameSuggestions = true;
diff --git a/pkg/analyzer_plugin/test/src/utilities/completion/optype_test.dart b/pkg/analyzer_plugin/test/src/utilities/completion/optype_test.dart
index ee2f494..f5970dd 100644
--- a/pkg/analyzer_plugin/test/src/utilities/completion/optype_test.dart
+++ b/pkg/analyzer_plugin/test/src/utilities/completion/optype_test.dart
@@ -2156,9 +2156,35 @@
         voidReturn: true);
   }
 
-  Future<void> test_returnStatement_empty() async {
-    // ReturnStatement  Block
-    addTestSource('f() { var vvv = 42; return ^ }');
+  Future<void> test_returnStatement_empty_noSemicolon() async {
+    addTestSource('f() { return ^ }');
+    await assertOpType(
+        completionLocation: 'ReturnStatement_expression',
+        constructors: true,
+        returnValue: true,
+        typeNames: true);
+  }
+
+  Future<void> test_returnStatement_empty_semicolon() async {
+    addTestSource('f() { return ^; }');
+    await assertOpType(
+        completionLocation: 'ReturnStatement_expression',
+        constructors: true,
+        returnValue: true,
+        typeNames: true);
+  }
+
+  Future<void> test_returnStatement_nonEmpty_noSemicolon() async {
+    addTestSource('f() { return a^ }');
+    await assertOpType(
+        completionLocation: 'ReturnStatement_expression',
+        constructors: true,
+        returnValue: true,
+        typeNames: true);
+  }
+
+  Future<void> test_returnStatement_nonEmpty_semicolon() async {
+    addTestSource('f() { return a^; }');
     await assertOpType(
         completionLocation: 'ReturnStatement_expression',
         constructors: true,
diff --git a/pkg/compiler/lib/src/commandline_options.dart b/pkg/compiler/lib/src/commandline_options.dart
index 129ecf0..a0395e5 100644
--- a/pkg/compiler/lib/src/commandline_options.dart
+++ b/pkg/compiler/lib/src/commandline_options.dart
@@ -108,6 +108,7 @@
   static const String noSoundNullSafety = '--no-sound-null-safety';
 
   static const String newDeferredSplit = '--new-deferred-split';
+  static const String noNewDeferredSplit = '--no-new-deferred-split';
   static const String reportInvalidInferredDeferredTypes =
       '--report-invalid-deferred-types';
   static const String deferClassTypes = '--defer-class-types';
diff --git a/pkg/compiler/lib/src/deferred_load.dart b/pkg/compiler/lib/src/deferred_load.dart
index c09c0cc..d47da8e 100644
--- a/pkg/compiler/lib/src/deferred_load.dart
+++ b/pkg/compiler/lib/src/deferred_load.dart
@@ -311,17 +311,21 @@
         worldImpact,
         WorldImpactVisitorImpl(
             visitStaticUse: (MemberEntity member, StaticUse staticUse) {
-          Entity usedEntity = staticUse.element;
-          if (usedEntity is MemberEntity) {
-            dependencies.addMember(usedEntity, staticUse.deferredImport);
-          } else {
-            assert(usedEntity is KLocalFunction,
-                failedAt(usedEntity, "Unexpected static use $staticUse."));
-            KLocalFunction localFunction = usedEntity;
-            // TODO(sra): Consult KClosedWorld to see if signature is needed.
-            _collectTypeDependencies(localFunction.functionType, dependencies);
-            dependencies.localFunctions.add(localFunction);
+          void processEntity() {
+            Entity usedEntity = staticUse.element;
+            if (usedEntity is MemberEntity) {
+              dependencies.addMember(usedEntity, staticUse.deferredImport);
+            } else {
+              assert(usedEntity is KLocalFunction,
+                  failedAt(usedEntity, "Unexpected static use $staticUse."));
+              KLocalFunction localFunction = usedEntity;
+              // TODO(sra): Consult KClosedWorld to see if signature is needed.
+              _collectTypeDependencies(
+                  localFunction.functionType, dependencies);
+              dependencies.localFunctions.add(localFunction);
+            }
           }
+
           switch (staticUse.kind) {
             case StaticUseKind.CONSTRUCTOR_INVOKE:
             case StaticUseKind.CONST_CONSTRUCTOR_INVOKE:
@@ -334,6 +338,7 @@
               // arguments.
               _collectTypeArgumentDependencies(
                   staticUse.type.typeArguments, dependencies);
+              processEntity();
               break;
             case StaticUseKind.STATIC_INVOKE:
             case StaticUseKind.CLOSURE_CALL:
@@ -342,8 +347,29 @@
               // arguments.
               _collectTypeArgumentDependencies(
                   staticUse.typeArguments, dependencies);
+              processEntity();
               break;
-            default:
+            case StaticUseKind.STATIC_TEAR_OFF:
+            case StaticUseKind.CLOSURE:
+            case StaticUseKind.STATIC_GET:
+            case StaticUseKind.STATIC_SET:
+              processEntity();
+              break;
+            case StaticUseKind.SUPER_TEAR_OFF:
+            case StaticUseKind.SUPER_FIELD_SET:
+            case StaticUseKind.SUPER_GET:
+            case StaticUseKind.SUPER_SETTER_SET:
+            case StaticUseKind.SUPER_INVOKE:
+            case StaticUseKind.INSTANCE_FIELD_GET:
+            case StaticUseKind.INSTANCE_FIELD_SET:
+            case StaticUseKind.FIELD_INIT:
+            case StaticUseKind.FIELD_CONSTANT_INIT:
+              // These static uses are not relevant for this algorithm.
+              break;
+            case StaticUseKind.CALL_METHOD:
+            case StaticUseKind.INLINING:
+              failedAt(element, "Unexpected static use: $staticUse.");
+              break;
           }
         }, visitTypeUse: (MemberEntity member, TypeUse typeUse) {
           void addClassIfInterfaceType(DartType t, [ImportEntity import]) {
diff --git a/pkg/compiler/lib/src/inferrer/powersets/powerset_bits.dart b/pkg/compiler/lib/src/inferrer/powersets/powerset_bits.dart
index 82af3fd..d0dd4f0 100644
--- a/pkg/compiler/lib/src/inferrer/powersets/powerset_bits.dart
+++ b/pkg/compiler/lib/src/inferrer/powersets/powerset_bits.dart
@@ -12,11 +12,11 @@
 import '../../world.dart';
 import '../abstract_value_domain.dart';
 
+/// This class is used as an API by the powerset abstract value domain to help
+/// implement some queries. It stores the bitmasks as integers and has the
+/// advantage that the operations needed are relatively fast. This will pack
+/// multiple powerset domains into a single integer.
 class PowersetBitsDomain {
-  // This class is used as an API by the powerset abstract value domain to help implement some queries.
-  // It stores the bitmasks as integers and has the advantage that the operations needed
-  // are relatively fast. This will pack multiple powerset domains into a single integer
-
   final JClosedWorld _closedWorld;
 
   static const int _trueIndex = 0;
@@ -54,10 +54,20 @@
       isDefinitelyFalse(value) ||
       isDefinitelyNull(value);
 
+  /// Returns `true` if only singleton bits are set and `false` otherwise.
+  bool isPrecise(int value) => !isPotentiallyOther(value);
+
   AbstractBool isOther(int value) =>
       AbstractBool.maybeOrFalse(isPotentiallyOther(value));
-  AbstractBool isNotOther(int value) =>
-      AbstractBool.trueOrMaybe(!isPotentiallyOther(value));
+
+  AbstractBool isIn(int subset, int superset) {
+    if (union(subset, superset) == superset) {
+      if (isPrecise(superset)) return AbstractBool.True;
+    } else {
+      if (isPrecise(subset)) return AbstractBool.False;
+    }
+    return AbstractBool.Maybe;
+  }
 
   AbstractBool needsNoSuchMethodHandling(int receiver, Selector selector) =>
       AbstractBool.Maybe;
@@ -106,7 +116,7 @@
   }
 
   AbstractBool areDisjoint(int a, int b) =>
-      AbstractBool.trueOrMaybe(a & b == powersetBottom);
+      AbstractBool.trueOrMaybe(intersection(a, b) == powersetBottom);
 
   int intersection(int a, int b) {
     return a & b;
@@ -116,80 +126,63 @@
     return a | b;
   }
 
-  AbstractBool isPrimitiveOrNull(int value) =>
-      isPrimitive(value) | isNull(value);
+  AbstractBool isPrimitiveOrNull(int value) => isPrimitive(excludeNull(value));
 
-  AbstractBool isStringOrNull(int value) => isString(value) | isNull(value);
+  AbstractBool isStringOrNull(int value) => isString(excludeNull(value));
 
-  AbstractBool isString(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isString(int value) => isOther(value);
 
-  AbstractBool isBooleanOrNull(int value) => isBoolean(value) | isNull(value);
+  AbstractBool isBooleanOrNull(int value) => isBoolean(excludeNull(value));
 
   AbstractBool isBoolean(int value) => isPotentiallyBoolean(value)
       ? AbstractBool.trueOrMaybe(!isPotentiallyNullOrOther(value))
       : AbstractBool.False;
 
-  AbstractBool isDoubleOrNull(int value) => isDouble(value) | isNull(value);
+  AbstractBool isDoubleOrNull(int value) => isDouble(excludeNull(value));
 
-  AbstractBool isDouble(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isDouble(int value) => isOther(value);
 
-  AbstractBool isNumberOrNull(int value) => isNumber(value) | isNull(value);
+  AbstractBool isNumberOrNull(int value) => isNumber(excludeNull(value));
 
-  AbstractBool isNumber(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isNumber(int value) => isOther(value);
 
-  AbstractBool isIntegerOrNull(int value) => isDouble(value) | isNull(value);
+  AbstractBool isIntegerOrNull(int value) => isInteger(excludeNull(value));
 
   AbstractBool isPositiveIntegerOrNull(int value) =>
-      isPositiveInteger(value) | isNull(value);
+      isPositiveInteger(excludeNull(value));
 
-  AbstractBool isPositiveInteger(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isPositiveInteger(int value) => isOther(value);
 
-  AbstractBool isUInt31(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isUInt31(int value) => isOther(value);
 
-  AbstractBool isUInt32(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isUInt32(int value) => isOther(value);
 
-  AbstractBool isInteger(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isInteger(int value) => isOther(value);
 
   AbstractBool isInterceptor(int value) => AbstractBool.Maybe;
 
-  AbstractBool isPrimitiveString(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isPrimitiveString(int value) => isOther(value);
 
-  AbstractBool isArray(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isArray(int value) => isOther(value);
 
-  AbstractBool isMutableIndexable(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isMutableIndexable(int value) => isOther(value);
 
-  AbstractBool isMutableArray(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isMutableArray(int value) => isOther(value);
 
-  AbstractBool isExtendableArray(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isExtendableArray(int value) => isOther(value);
 
-  AbstractBool isFixedArray(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isFixedArray(int value) => isOther(value);
 
-  AbstractBool isIndexablePrimitive(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isIndexablePrimitive(int value) => isOther(value);
 
-  AbstractBool isPrimitiveArray(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isPrimitiveArray(int value) => isOther(value);
 
   AbstractBool isPrimitiveBoolean(int value) => isPotentiallyBoolean(value)
       ? AbstractBool.trueOrMaybe(
           isDefinitelyTrue(value) || isDefinitelyFalse(value))
       : AbstractBool.False;
 
-  AbstractBool isPrimitiveNumber(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool isPrimitiveNumber(int value) => isOther(value);
 
   AbstractBool isPrimitive(int value) =>
       AbstractBool.trueOrMaybe(isSingleton(value));
@@ -203,13 +196,16 @@
   AbstractBool isExact(int value) => AbstractBool.Maybe;
 
   AbstractBool isEmpty(int value) =>
-      AbstractBool.trueOrFalse(value == powersetBottom);
+      AbstractBool.trueOrMaybe(value == powersetBottom);
 
   AbstractBool isInstanceOf(int value, ClassEntity cls) => AbstractBool.Maybe;
 
   AbstractBool isInstanceOfOrNull(int value, ClassEntity cls) =>
       AbstractBool.Maybe;
 
+  AbstractBool containsAll(int value) =>
+      AbstractBool.maybeOrFalse(value == powersetTop);
+
   AbstractBool containsOnlyType(int value, ClassEntity cls) =>
       AbstractBool.Maybe;
 
@@ -223,8 +219,7 @@
     return value & (powersetTop - nullMask);
   }
 
-  AbstractBool couldBeTypedArray(int value) =>
-      AbstractBool.maybeOrFalse(isPotentiallyOther(value));
+  AbstractBool couldBeTypedArray(int value) => isOther(value);
 
   AbstractBool isTypedArray(int value) => AbstractBool.Maybe;
 
diff --git a/pkg/compiler/lib/src/inferrer/powersets/powersets.dart b/pkg/compiler/lib/src/inferrer/powersets/powersets.dart
index 1cc13f9..9b1111d 100644
--- a/pkg/compiler/lib/src/inferrer/powersets/powersets.dart
+++ b/pkg/compiler/lib/src/inferrer/powersets/powersets.dart
@@ -91,19 +91,19 @@
 
   @override
   AbstractBool isFixedLengthJsIndexable(covariant PowersetValue value) =>
-      _powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue
+      _powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse
           ? AbstractBool.False
           : _abstractValueDomain.isFixedLengthJsIndexable(value._abstractValue);
 
   @override
   AbstractBool isJsIndexableAndIterable(covariant PowersetValue value) =>
-      _powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue
+      _powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse
           ? AbstractBool.False
           : _abstractValueDomain.isJsIndexableAndIterable(unwrapOrNull(value));
 
   @override
   AbstractBool isJsIndexable(covariant PowersetValue value) =>
-      _powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue
+      _powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse
           ? AbstractBool.False
           : _abstractValueDomain.isJsIndexable(value._abstractValue);
 
@@ -113,26 +113,32 @@
       _abstractValueDomain.locateSingleMember(
           receiver._abstractValue, selector);
 
-  //TODO(coam): for now we are delegating this implementation to the CommonMasks domain
   @override
   AbstractBool isIn(
-      covariant PowersetValue subset, covariant PowersetValue superset) {
-    AbstractBool wrappedBool = _abstractValueDomain.isIn(
-        subset._abstractValue, superset._abstractValue);
-    return wrappedBool;
-  }
+          covariant PowersetValue subset, covariant PowersetValue superset) =>
+      AbstractBool.strengthen(
+          _powersetBitsDomain.isIn(
+              subset._powersetBits, superset._powersetBits),
+          _abstractValueDomain.isIn(
+              subset._abstractValue, superset._abstractValue));
 
   @override
   AbstractBool needsNoSuchMethodHandling(
           covariant PowersetValue receiver, Selector selector) =>
-      _abstractValueDomain.needsNoSuchMethodHandling(
-          receiver._abstractValue, selector);
+      AbstractBool.strengthen(
+          _powersetBitsDomain.needsNoSuchMethodHandling(
+              receiver._powersetBits, selector),
+          _abstractValueDomain.needsNoSuchMethodHandling(
+              receiver._abstractValue, selector));
 
   @override
   AbstractBool isTargetingMember(
           covariant PowersetValue receiver, MemberEntity member, Name name) =>
-      _abstractValueDomain.isTargetingMember(
-          receiver._abstractValue, member, name);
+      AbstractBool.strengthen(
+          _powersetBitsDomain.isTargetingMember(
+              receiver._powersetBits, member, name),
+          _abstractValueDomain.isTargetingMember(
+              receiver._abstractValue, member, name));
 
   @override
   AbstractValue computeReceiver(Iterable<MemberEntity> members) {
@@ -185,7 +191,7 @@
   @override
   AbstractValue getDictionaryValueForKey(
       covariant PowersetValue value, String key) {
-    if (_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue) {
+    if (_powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse) {
       return dynamicType;
     }
     AbstractValue abstractValue = _abstractValueDomain.getDictionaryValueForKey(
@@ -195,7 +201,7 @@
 
   @override
   bool containsDictionaryKey(covariant PowersetValue value, String key) =>
-      _powersetBitsDomain.isNotOther(value._powersetBits).isPotentiallyFalse &&
+      _powersetBitsDomain.isOther(value._powersetBits).isPotentiallyTrue &&
       _abstractValueDomain.containsDictionaryKey(value._abstractValue, key);
 
   @override
@@ -221,12 +227,12 @@
 
   @override
   bool isDictionary(covariant PowersetValue value) =>
-      !_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue &&
+      _powersetBitsDomain.isOther(value._powersetBits).isPotentiallyTrue &&
       _abstractValueDomain.isDictionary(value._abstractValue);
 
   @override
   AbstractValue getMapValueType(covariant PowersetValue value) {
-    if (_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue) {
+    if (_powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse) {
       return dynamicType;
     }
     AbstractValue abstractValue =
@@ -236,7 +242,7 @@
 
   @override
   AbstractValue getMapKeyType(covariant PowersetValue value) {
-    if (_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue) {
+    if (_powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse) {
       return dynamicType;
     }
     AbstractValue abstractValue =
@@ -263,12 +269,12 @@
 
   @override
   bool isMap(covariant PowersetValue value) =>
-      !_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue &&
+      _powersetBitsDomain.isOther(value._powersetBits).isPotentiallyTrue &&
       _abstractValueDomain.isMap(value._abstractValue);
 
   @override
   AbstractValue getSetElementType(covariant PowersetValue value) {
-    if (_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue) {
+    if (_powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse) {
       return dynamicType;
     }
     AbstractValue abstractValue =
@@ -293,18 +299,18 @@
 
   @override
   bool isSet(covariant PowersetValue value) =>
-      !_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue &&
+      _powersetBitsDomain.isOther(value._powersetBits).isPotentiallyTrue &&
       _abstractValueDomain.isSet(value._abstractValue);
 
   @override
   int getContainerLength(covariant PowersetValue value) =>
-      _powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue
+      _powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse
           ? null
           : _abstractValueDomain.getContainerLength(value._abstractValue);
 
   @override
   AbstractValue getContainerElementType(covariant PowersetValue value) {
-    if (_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue) {
+    if (_powersetBitsDomain.isOther(value._powersetBits).isDefinitelyFalse) {
       return dynamicType;
     }
     AbstractValue abstractValue =
@@ -331,7 +337,7 @@
 
   @override
   bool isContainer(covariant PowersetValue value) =>
-      !_powersetBitsDomain.isNotOther(value._powersetBits).isDefinitelyTrue &&
+      _powersetBitsDomain.isOther(value._powersetBits).isPotentiallyTrue &&
       _abstractValueDomain.isContainer(value._abstractValue);
 
   // TODO(coam): this can be more precise if we build a ConstantValue visitor
@@ -355,9 +361,8 @@
 
   @override
   AbstractBool containsAll(covariant PowersetValue a) =>
-      a._powersetBits != _powersetBitsDomain.powersetTop
-          ? AbstractBool.False
-          : _abstractValueDomain.containsAll(a._abstractValue);
+      AbstractBool.strengthen(_powersetBitsDomain.containsAll(a._powersetBits),
+          _abstractValueDomain.containsAll(a._abstractValue));
 
   @override
   AbstractBool areDisjoint(
@@ -571,11 +576,10 @@
       AbstractBool.strengthen(_powersetBitsDomain.isExact(value._powersetBits),
           _abstractValueDomain.isExact(value._abstractValue));
 
-  // TODO(coam): For now we delegate this to the CommonMasks domain
   @override
-  AbstractBool isEmpty(covariant PowersetValue value) {
-    return _abstractValueDomain.isEmpty(value._abstractValue);
-  }
+  AbstractBool isEmpty(covariant PowersetValue value) =>
+      AbstractBool.strengthen(_powersetBitsDomain.isEmpty(value._powersetBits),
+          _abstractValueDomain.isEmpty(value._abstractValue));
 
   @override
   AbstractBool isInstanceOf(covariant PowersetValue value, ClassEntity cls) =>
diff --git a/pkg/compiler/lib/src/kernel/kernel_strategy.dart b/pkg/compiler/lib/src/kernel/kernel_strategy.dart
index 99c1ce9..478c2bc 100644
--- a/pkg/compiler/lib/src/kernel/kernel_strategy.dart
+++ b/pkg/compiler/lib/src/kernel/kernel_strategy.dart
@@ -120,6 +120,7 @@
     ClassEntity objectClass = commonElements.objectClass;
     elementEnvironment.forEachClassMember(objectClass,
         (_, MemberEntity member) {
+      if (!member.isInstanceMember) return;
       MemberEntity interceptorMember = elementEnvironment
           .lookupLocalClassMember(interceptorClass, member.name);
       // Interceptors must override all Object methods due to calling convention
diff --git a/pkg/compiler/lib/src/options.dart b/pkg/compiler/lib/src/options.dart
index f4bc3a6..40d9dc6 100644
--- a/pkg/compiler/lib/src/options.dart
+++ b/pkg/compiler/lib/src/options.dart
@@ -146,7 +146,9 @@
   /// When [reportInvalidInferredDeferredTypes] shows no errors, we expect this
   /// flag to produce the same or better results than the current unsound
   /// implementation.
-  bool newDeferredSplit = false;
+  bool newDeferredSplit = false; // default value.
+  bool _newDeferredSplit = false;
+  bool _noNewDeferredSplit = false;
 
   /// Show errors when a deferred type is inferred as a return type of a closure
   /// or in a type parameter. Those cases cause the compiler today to behave
@@ -443,7 +445,8 @@
           _extractStringOption(options, '--build-id=', _UNDETERMINED_BUILD_ID)
       ..compileForServer = _hasOption(options, Flags.serverMode)
       ..deferredMapUri = _extractUriOption(options, '--deferred-map=')
-      ..newDeferredSplit = _hasOption(options, Flags.newDeferredSplit)
+      .._newDeferredSplit = _hasOption(options, Flags.newDeferredSplit)
+      .._noNewDeferredSplit = _hasOption(options, Flags.noNewDeferredSplit)
       ..reportInvalidInferredDeferredTypes =
           _hasOption(options, Flags.reportInvalidInferredDeferredTypes)
       .._deferClassTypes = _hasOption(options, Flags.deferClassTypes)
@@ -556,6 +559,10 @@
       throw ArgumentError("'${Flags.deferClassTypes}' incompatible with "
           "'${Flags.noDeferClassTypes}'");
     }
+    if (_newDeferredSplit && _noNewDeferredSplit) {
+      throw ArgumentError("'${Flags.newDeferredSplit}' incompatible with "
+          "'${Flags.noNewDeferredSplit}'");
+    }
   }
 
   void deriveOptions() {
@@ -625,6 +632,9 @@
       // TODO(sra): Add a command-line flag to control this independently.
       enableNativeReturnNullAssertions = true;
     }
+
+    if (_newDeferredSplit) newDeferredSplit = true;
+    if (_noNewDeferredSplit) newDeferredSplit = false;
   }
 
   /// Returns `true` if warnings and hints are shown for all packages.
diff --git a/pkg/dartdev/lib/dartdev.dart b/pkg/dartdev/lib/dartdev.dart
index 0f031ac..74be57c 100644
--- a/pkg/dartdev/lib/dartdev.dart
+++ b/pkg/dartdev/lib/dartdev.dart
@@ -8,8 +8,8 @@
 import 'package:analyzer/src/dart/analysis/experiments.dart';
 import 'package:args/args.dart';
 import 'package:args/command_runner.dart';
-import 'package:dart_style/src/cli/format_command.dart';
 import 'package:cli_util/cli_logging.dart';
+import 'package:dart_style/src/cli/format_command.dart';
 import 'package:nnbd_migration/migration_cli.dart';
 import 'package:usage/usage.dart';
 
@@ -269,9 +269,9 @@
     argParser.addMultiOption(
       experimentFlagName,
       valueHelp: 'experiment',
-      allowed: features.map((feature) => feature.enableString),
       allowedHelp: verbose ? allowedHelp : null,
-      help: 'Enable one or more experimental features.',
+      help: 'Enable one or more experimental features '
+          '(see dart.dev/go/experiments).',
     );
   }
 }
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 558db46..7452b96 100644
--- a/pkg/front_end/lib/src/api_prototype/compiler_options.dart
+++ b/pkg/front_end/lib/src/api_prototype/compiler_options.dart
@@ -7,6 +7,8 @@
 import 'package:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
     show DiagnosticMessageHandler;
 
+import 'package:kernel/ast.dart' show Version;
+
 import 'package:kernel/default_language_version.dart' as kernel
     show defaultLanguageVersion;
 
@@ -130,7 +132,9 @@
   /// Features not mentioned in the map will have their default value.
   Map<ExperimentalFlag, bool> experimentalFlags = <ExperimentalFlag, bool>{};
 
-  AllowedExperimentalFlags allowedExperimentalFlags;
+  AllowedExperimentalFlags allowedExperimentalFlagsForTesting;
+  Map<ExperimentalFlag, Version> experimentEnabledVersionForTesting;
+  Map<ExperimentalFlag, Version> experimentReleasedVersionForTesting;
 
   /// Environment map used when evaluating `bool.fromEnvironment`,
   /// `int.fromEnvironment` and `String.fromEnvironment` during constant
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 c318c3d..42230ec 100644
--- a/pkg/front_end/lib/src/api_prototype/experimental_flags.dart
+++ b/pkg/front_end/lib/src/api_prototype/experimental_flags.dart
@@ -118,3 +118,38 @@
   }
   return enabled;
 }
+
+Version getExperimentEnabledVersionInLibrary(
+    ExperimentalFlag flag, Uri canonicalUri,
+    {AllowedExperimentalFlags allowedExperimentalFlags,
+    Map<ExperimentalFlag, Version> experimentEnabledVersionForTesting,
+    Map<ExperimentalFlag, Version> experimentReleasedVersionForTesting}) {
+  allowedExperimentalFlags ??= defaultAllowedExperimentalFlags;
+  Set<ExperimentalFlag> allowedFlags;
+  if (canonicalUri.scheme == 'dart') {
+    allowedFlags = allowedExperimentalFlags.forSdkLibrary(canonicalUri.path);
+  } else if (canonicalUri.scheme == 'package') {
+    int index = canonicalUri.path.indexOf('/');
+    String packageName;
+    if (index >= 0) {
+      packageName = canonicalUri.path.substring(0, index);
+    } else {
+      packageName = canonicalUri.path;
+    }
+    allowedFlags = allowedExperimentalFlags.forPackage(packageName);
+  }
+  Version version;
+  if (allowedFlags != null && allowedFlags.contains(flag)) {
+    if (experimentReleasedVersionForTesting != null) {
+      version = experimentReleasedVersionForTesting[flag];
+    }
+    version ??= experimentReleasedVersion[flag];
+  } else {
+    if (experimentEnabledVersionForTesting != null) {
+      version = experimentEnabledVersionForTesting[flag];
+    }
+    version = experimentEnabledVersion[flag];
+  }
+  assert(version != null, "No version for enabling $flag in $canonicalUri.");
+  return version;
+}
diff --git a/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart b/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
index bd92018b..ab3a7e3 100644
--- a/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
+++ b/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
@@ -92,6 +92,34 @@
   ExperimentalFlag.variance: false,
 };
 
+const Map<ExperimentalFlag, Version> experimentEnabledVersion = {
+  ExperimentalFlag.alternativeInvalidationStrategy: const Version(2, 10),
+  ExperimentalFlag.constantUpdate2018: const Version(2, 4),
+  ExperimentalFlag.controlFlowCollections: const Version(2, 2),
+  ExperimentalFlag.extensionMethods: const Version(2, 6),
+  ExperimentalFlag.nonNullable: const Version(2, 10),
+  ExperimentalFlag.nonfunctionTypeAliases: const Version(2, 10),
+  ExperimentalFlag.setLiterals: const Version(2, 2),
+  ExperimentalFlag.spreadCollections: const Version(2, 2),
+  ExperimentalFlag.tripleShift: const Version(2, 10),
+  ExperimentalFlag.valueClass: const Version(2, 10),
+  ExperimentalFlag.variance: const Version(2, 10),
+};
+
+const Map<ExperimentalFlag, Version> experimentReleasedVersion = {
+  ExperimentalFlag.alternativeInvalidationStrategy: const Version(2, 10),
+  ExperimentalFlag.constantUpdate2018: const Version(2, 4),
+  ExperimentalFlag.controlFlowCollections: const Version(2, 2),
+  ExperimentalFlag.extensionMethods: const Version(2, 6),
+  ExperimentalFlag.nonNullable: const Version(2, 10),
+  ExperimentalFlag.nonfunctionTypeAliases: const Version(2, 10),
+  ExperimentalFlag.setLiterals: const Version(2, 2),
+  ExperimentalFlag.spreadCollections: const Version(2, 2),
+  ExperimentalFlag.tripleShift: const Version(2, 10),
+  ExperimentalFlag.valueClass: const Version(2, 10),
+  ExperimentalFlag.variance: const Version(2, 10),
+};
+
 const AllowedExperimentalFlags defaultAllowedExperimentalFlags =
     const AllowedExperimentalFlags(sdkDefaultExperiments: {
   ExperimentalFlag.nonNullable,
diff --git a/pkg/front_end/lib/src/base/processed_options.dart b/pkg/front_end/lib/src/base/processed_options.dart
index 9421858..4520870 100644
--- a/pkg/front_end/lib/src/base/processed_options.dart
+++ b/pkg/front_end/lib/src/base/processed_options.dart
@@ -12,7 +12,8 @@
 
 import 'package:kernel/binary/ast_from_binary.dart' show BinaryBuilder;
 
-import 'package:kernel/kernel.dart' show CanonicalName, Component, Location;
+import 'package:kernel/kernel.dart'
+    show CanonicalName, Component, Location, Version;
 
 import 'package:kernel/target/targets.dart'
     show NoneTarget, Target, TargetFlags;
@@ -346,7 +347,17 @@
       flags.ExperimentalFlag flag, Uri importUri) {
     return flags.isExperimentEnabledInLibrary(flag, importUri,
         experimentalFlags: _raw.experimentalFlags,
-        allowedExperimentalFlags: _raw.allowedExperimentalFlags);
+        allowedExperimentalFlags: _raw.allowedExperimentalFlagsForTesting);
+  }
+
+  Version getExperimentEnabledVersionInLibrary(
+      flags.ExperimentalFlag flag, Uri importUri) {
+    return flags.getExperimentEnabledVersionInLibrary(flag, importUri,
+        allowedExperimentalFlags: _raw.allowedExperimentalFlagsForTesting,
+        experimentEnabledVersionForTesting:
+            _raw.experimentEnabledVersionForTesting,
+        experimentReleasedVersionForTesting:
+            _raw.experimentReleasedVersionForTesting);
   }
 
   /// Get an outline component that summarizes the SDK, if any.
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index 89ec09f..eb2e6cf 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -2069,6 +2069,10 @@
       Name n = new Name(name, libraryBuilder.nameOrigin);
       if (!isQualified && isDeclarationInstanceContext) {
         assert(declaration == null);
+        if (inLateFieldInitializer) {
+          // Implicit access on 'this' is allowed in a late field initializer.
+          return new ThisPropertyAccessGenerator(this, token, n);
+        }
         if (constantContext != ConstantContext.none || member.isField) {
           return new UnresolvedNameGenerator(this, token, n);
         }
diff --git a/pkg/front_end/lib/src/fasta/kernel/implicit_field_type.dart b/pkg/front_end/lib/src/fasta/kernel/implicit_field_type.dart
index e52b549..971b0e5 100644
--- a/pkg/front_end/lib/src/fasta/kernel/implicit_field_type.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/implicit_field_type.dart
@@ -140,6 +140,8 @@
       bodyBuilder.constantContext = fieldBuilder.isConst
           ? ConstantContext.inferred
           : ConstantContext.none;
+      bodyBuilder.inFieldInitializer = true;
+      bodyBuilder.inLateFieldInitializer = fieldBuilder.isLate;
       Expression initializer =
           bodyBuilder.parseFieldInitializer(initializerToken);
       initializerToken = null;
diff --git a/pkg/front_end/lib/src/fasta/source/outline_builder.dart b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
index 4ed6843..56c17ed 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
@@ -1651,7 +1651,7 @@
           !libraryBuilder.enableNonfunctionTypeAliasesInLibrary) {
         if (type.nullabilityBuilder.build(libraryBuilder) ==
                 Nullability.nullable &&
-            libraryBuilder.enableNonNullableInLibrary) {
+            libraryBuilder.isNonNullableByDefault) {
           // The error is reported when the non-nullable experiment is enabled.
           // Otherwise, the attempt to use a nullable type will be reported
           // elsewhere.
diff --git a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
index 0f9c220..304aed3 100644
--- a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
@@ -336,6 +336,7 @@
   bool _enableVarianceInLibrary;
   bool _enableNonfunctionTypeAliasesInLibrary;
   bool _enableNonNullableInLibrary;
+  Version _enableNonNullableVersionInLibrary;
   bool _enableTripleShiftInLibrary;
   bool _enableExtensionMethodsInLibrary;
 
@@ -348,10 +349,20 @@
           .isExperimentEnabledInLibrary(ExperimentalFlag.nonfunctionTypeAliases,
               _packageUri ?? importUri);
 
+  /// Returns `true` if the 'non-nullable' experiment is enabled for this
+  /// library.
+  ///
+  /// Note that the library might still opt out of the experiment by having
+  /// a version that is too low for opting in to the experiment.
   bool get enableNonNullableInLibrary => _enableNonNullableInLibrary ??=
       loader.target.isExperimentEnabledInLibrary(
           ExperimentalFlag.nonNullable, _packageUri ?? importUri);
 
+  Version get enableNonNullableVersionInLibrary =>
+      _enableNonNullableVersionInLibrary ??= loader.target
+          .getExperimentEnabledVersionInLibrary(
+              ExperimentalFlag.nonNullable, _packageUri ?? importUri);
+
   bool get enableTripleShiftInLibrary => _enableTripleShiftInLibrary ??=
       loader.target.isExperimentEnabledInLibrary(
           ExperimentalFlag.tripleShift, _packageUri ?? importUri);
@@ -426,7 +437,7 @@
   @override
   bool get isNonNullableByDefault =>
       enableNonNullableInLibrary &&
-      languageVersion.version >= enableNonNullableVersion &&
+      languageVersion.version >= enableNonNullableVersionInLibrary &&
       !isOptOutTest(library.importUri);
 
   static bool isOptOutTest(Uri uri) {
diff --git a/pkg/front_end/lib/src/fasta/source/source_loader.dart b/pkg/front_end/lib/src/fasta/source/source_loader.dart
index e46e6ec..575f6f0 100644
--- a/pkg/front_end/lib/src/fasta/source/source_loader.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_loader.dart
@@ -352,6 +352,7 @@
       // libraries with no corresponding package config we generate a message
       // per library.
       Map<String, List<LibraryBuilder>> libraryByPackage = {};
+      Map<Package, Version> enableNonNullableVersionByPackage = {};
       for (LibraryBuilder libraryBuilder in _strongOptOutLibraries) {
         Package package =
             target.uriTranslator.getPackage(libraryBuilder.importUri);
@@ -359,6 +360,11 @@
         if (package != null &&
             package.languageVersion != null &&
             package.languageVersion is! InvalidLanguageVersion) {
+          Version enableNonNullableVersion =
+              enableNonNullableVersionByPackage[package] ??=
+                  target.getExperimentEnabledVersionInLibrary(
+                      ExperimentalFlag.nonNullable,
+                      new Uri(scheme: 'package', path: package.name));
           Version version = new Version(
               package.languageVersion.major, package.languageVersion.minor);
           if (version < enableNonNullableVersion) {
diff --git a/pkg/front_end/lib/src/fasta/source/stack_listener_impl.dart b/pkg/front_end/lib/src/fasta/source/stack_listener_impl.dart
index 8c048e0..0e6a737 100644
--- a/pkg/front_end/lib/src/fasta/source/stack_listener_impl.dart
+++ b/pkg/front_end/lib/src/fasta/source/stack_listener_impl.dart
@@ -92,7 +92,11 @@
     assert(token != null);
     if (libraryBuilder.enableNonNullableInLibrary) {
       if (libraryBuilder.languageVersion.isExplicit) {
-        addProblem(messageNonNullableOptOut, token.charOffset, token.charCount,
+        addProblem(
+            templateNonNullableOptOutExplicit.withArguments(
+                libraryBuilder.enableNonNullableVersionInLibrary.toText()),
+            token.charOffset,
+            token.charCount,
             context: <LocatedMessage>[
               messageNonNullableOptOutComment.withLocation(
                   libraryBuilder.languageVersion.fileUri,
@@ -100,14 +104,20 @@
                   libraryBuilder.languageVersion.charCount)
             ]);
       } else {
-        addProblem(messageNonNullableOptOut, token.charOffset, token.charCount);
+        addProblem(
+            templateNonNullableOptOutImplicit.withArguments(
+                libraryBuilder.enableNonNullableVersionInLibrary.toText()),
+            token.charOffset,
+            token.charCount);
       }
     } else if (!libraryBuilder.loader.target
         .isExperimentEnabledGlobally(ExperimentalFlag.nonNullable)) {
-      if (libraryBuilder.languageVersion.version < enableNonNullableVersion) {
+      if (libraryBuilder.languageVersion.version <
+          libraryBuilder.enableNonNullableVersionInLibrary) {
         addProblem(
             templateExperimentNotEnabledNoFlagInvalidLanguageVersion
-                .withArguments(enableNonNullableVersion.toText()),
+                .withArguments(
+                    libraryBuilder.enableNonNullableVersionInLibrary.toText()),
             token.offset,
             noLength);
       } else {
@@ -115,8 +125,8 @@
       }
     } else {
       addProblem(
-          templateExperimentNotEnabled.withArguments(
-              'non-nullable', enableNonNullableVersion.toText()),
+          templateExperimentNotEnabled.withArguments('non-nullable',
+              libraryBuilder.enableNonNullableVersionInLibrary.toText()),
           token.offset,
           noLength);
     }
diff --git a/pkg/front_end/lib/src/fasta/target_implementation.dart b/pkg/front_end/lib/src/fasta/target_implementation.dart
index c3666ec..57a4369 100644
--- a/pkg/front_end/lib/src/fasta/target_implementation.dart
+++ b/pkg/front_end/lib/src/fasta/target_implementation.dart
@@ -61,6 +61,11 @@
     return _options.isExperimentEnabledInLibrary(flag, importUri);
   }
 
+  Version getExperimentEnabledVersionInLibrary(
+      ExperimentalFlag flag, Uri importUri) {
+    return _options.getExperimentEnabledVersionInLibrary(flag, importUri);
+  }
+
   bool isExperimentEnabledGlobally(ExperimentalFlag flag) {
     return _options.isExperimentEnabledGlobally(flag);
   }
diff --git a/pkg/front_end/lib/src/testing/id_testing_helper.dart b/pkg/front_end/lib/src/testing/id_testing_helper.dart
index c7ccf95..c81c0a0 100644
--- a/pkg/front_end/lib/src/testing/id_testing_helper.dart
+++ b/pkg/front_end/lib/src/testing/id_testing_helper.dart
@@ -301,7 +301,7 @@
   options.debugDump = printCode;
   options.target = new NoneTarget(config.targetFlags);
   options.experimentalFlags.addAll(config.experimentalFlags);
-  options.allowedExperimentalFlags = config.allowedExperimentalFlags;
+  options.allowedExperimentalFlagsForTesting = config.allowedExperimentalFlags;
   options.nnbdMode = config.nnbdMode;
   if (config.librariesSpecificationUri != null) {
     Set<Uri> testFiles =
diff --git a/pkg/front_end/messages.status b/pkg/front_end/messages.status
index 258110e..742b62a 100644
--- a/pkg/front_end/messages.status
+++ b/pkg/front_end/messages.status
@@ -509,8 +509,10 @@
 NonNullableNotAssignedError/analyzerCode: Fail
 NonNullableNotAssignedWarning/analyzerCode: Fail
 NonNullableNotAssignedWarning/example: Fail
-NonNullableOptOut/analyzerCode: Fail
-NonNullableOptOut/example: Fail
+NonNullableOptOutExplicit/analyzerCode: Fail
+NonNullableOptOutExplicit/example: Fail
+NonNullableOptOutImplicit/analyzerCode: Fail
+NonNullableOptOutImplicit/example: Fail
 NonNullAwareSpreadIsNull/analyzerCode: Fail # There's no analyzer code for that error yet.
 NonPartOfDirectiveInPart/part_wrapped_script1: Fail
 NonPartOfDirectiveInPart/script1: Fail
diff --git a/pkg/front_end/messages.yaml b/pkg/front_end/messages.yaml
index 8e97d33..2bd6be7 100644
--- a/pkg/front_end/messages.yaml
+++ b/pkg/front_end/messages.yaml
@@ -4090,12 +4090,13 @@
 FieldNonNullableNotInitializedByConstructorError:
   template: "This constructor should initialize field '#name' because its type '#type' doesn't allow null."
 
-NonNullableOptOut:
+NonNullableOptOutExplicit:
   template: "Null safety features are disabled for this library."
-  # Used to be this:
-  # tip: "Try removing the `@dart=` annotation or setting the language version higher."
-  # Once the version number is locked in, we can write something like that again.
-  tip: "Try removing the `@dart=` annotation or setting the language version higher."
+  tip: "Try removing the `@dart=` annotation or setting the language version to #string or higher."
+
+NonNullableOptOutImplicit:
+  template: "Null safety features are disabled for this library."
+  tip: "Try removing the package language version or setting the language version to #string or higher."
 
 NonNullableOptOutComment:
   template: "This is the annotation that opts out this library from null safety features."
diff --git a/pkg/front_end/test/fasta/expression_suite.dart b/pkg/front_end/test/fasta/expression_suite.dart
index 03865e8..5234822 100644
--- a/pkg/front_end/test/fasta/expression_suite.dart
+++ b/pkg/front_end/test/fasta/expression_suite.dart
@@ -413,7 +413,7 @@
       errors.add(message);
     }
     ..environmentDefines = const {}
-    ..allowedExperimentalFlags = const AllowedExperimentalFlags();
+    ..allowedExperimentalFlagsForTesting = const AllowedExperimentalFlags();
 
   final ProcessedOptions options =
       new ProcessedOptions(options: optionBuilder, inputs: [entryPoint]);
diff --git a/pkg/front_end/test/fasta/testing/suite.dart b/pkg/front_end/test/fasta/testing/suite.dart
index 99af171..67cb343 100644
--- a/pkg/front_end/test/fasta/testing/suite.dart
+++ b/pkg/front_end/test/fasta/testing/suite.dart
@@ -23,7 +23,12 @@
     show CompilerOptions, DiagnosticMessage;
 
 import 'package:front_end/src/api_prototype/experimental_flags.dart'
-    show ExperimentalFlag, defaultExperimentalFlags, isExperimentEnabled;
+    show
+        AllowedExperimentalFlags,
+        ExperimentalFlag,
+        defaultAllowedExperimentalFlags,
+        defaultExperimentalFlags,
+        isExperimentEnabled;
 
 import 'package:front_end/src/api_prototype/standard_file_system.dart'
     show StandardFileSystem;
@@ -59,7 +64,7 @@
 import 'package:front_end/src/fasta/uri_translator.dart' show UriTranslator;
 
 import 'package:kernel/ast.dart'
-    show AwaitExpression, Component, Library, Node, Visitor;
+    show AwaitExpression, Component, Library, Node, Version, Visitor;
 
 import 'package:kernel/class_hierarchy.dart' show ClassHierarchy;
 
@@ -182,10 +187,17 @@
 class LinkDependenciesOptions {
   final Set<Uri> content;
   final NnbdMode nnbdMode;
+  final AllowedExperimentalFlags allowedExperimentalFlags;
+  final Map<ExperimentalFlag, Version> experimentEnabledVersion;
+  final Map<ExperimentalFlag, Version> experimentReleasedVersion;
   Component component;
   List<Iterable<String>> errors;
 
-  LinkDependenciesOptions(this.content, {this.nnbdMode})
+  LinkDependenciesOptions(this.content,
+      {this.nnbdMode,
+      this.allowedExperimentalFlags,
+      this.experimentEnabledVersion,
+      this.experimentReleasedVersion})
       : assert(content != null);
 }
 
@@ -408,6 +420,9 @@
           new File.fromUri(directory.uri.resolve('link.options'));
       Set<Uri> content = new Set<Uri>();
       NnbdMode nnbdMode;
+      AllowedExperimentalFlags allowedExperimentalFlags;
+      Map<ExperimentalFlag, Version> experimentEnabledVersion;
+      Map<ExperimentalFlag, Version> experimentReleasedVersion;
       if (optionsFile.existsSync()) {
         for (String line in optionsFile.readAsStringSync().split('\n')) {
           line = line.trim();
@@ -430,6 +445,24 @@
                   'Nnbd mode $nnbdMode already specified.');
             }
             nnbdMode = NnbdMode.Weak;
+          } else if (line == '--fix-nnbd-release-version') {
+            // Allow package:allowed_package to use nnbd features from version
+            // 2.9.
+            allowedExperimentalFlags = new AllowedExperimentalFlags(
+                sdkDefaultExperiments:
+                    defaultAllowedExperimentalFlags.sdkDefaultExperiments,
+                sdkLibraryExperiments:
+                    defaultAllowedExperimentalFlags.sdkLibraryExperiments,
+                packageExperiments: {
+                  ...defaultAllowedExperimentalFlags.packageExperiments,
+                  'allowed_package': {ExperimentalFlag.nonNullable}
+                });
+            experimentEnabledVersion = const {
+              ExperimentalFlag.nonNullable: const Version(2, 10)
+            };
+            experimentReleasedVersion = const {
+              ExperimentalFlag.nonNullable: const Version(2, 9)
+            };
           } else {
             Uri uri = description.uri.resolve(line);
             if (uri.scheme != 'package') {
@@ -443,8 +476,11 @@
           }
         }
       }
-      linkDependenciesOptions =
-          new LinkDependenciesOptions(content, nnbdMode: nnbdMode);
+      linkDependenciesOptions = new LinkDependenciesOptions(content,
+          nnbdMode: nnbdMode,
+          allowedExperimentalFlags: allowedExperimentalFlags,
+          experimentEnabledVersion: experimentEnabledVersion,
+          experimentReleasedVersion: experimentReleasedVersion);
       _linkDependencies[directory.uri] = linkDependenciesOptions;
     }
     return linkDependenciesOptions;
@@ -642,7 +678,11 @@
         : (testOptions.nnbdAgnosticMode ? NnbdMode.Agnostic : NnbdMode.Strong);
     List<Uri> inputs = <Uri>[description.uri];
 
-    ProcessedOptions createProcessedOptions(NnbdMode nnbdMode) {
+    ProcessedOptions createProcessedOptions(
+        NnbdMode nnbdMode,
+        AllowedExperimentalFlags allowedExperimentalFlags,
+        Map<ExperimentalFlag, Version> experimentEnabledVersion,
+        Map<ExperimentalFlag, Version> experimentReleasedVersion) {
       CompilerOptions compilerOptions = new CompilerOptions()
         ..onDiagnostic = (DiagnosticMessage message) {
           errors.add(message.plainTextFormatted);
@@ -650,7 +690,10 @@
         ..environmentDefines = {}
         ..experimentalFlags = experimentalFlags
         ..nnbdMode = nnbdMode
-        ..librariesSpecificationUri = librariesSpecificationUri;
+        ..librariesSpecificationUri = librariesSpecificationUri
+        ..allowedExperimentalFlagsForTesting = allowedExperimentalFlags
+        ..experimentEnabledVersionForTesting = experimentEnabledVersion
+        ..experimentReleasedVersionForTesting = experimentReleasedVersion;
       if (testOptions.overwriteCurrentSdkVersion != null) {
         compilerOptions.currentSdkVersion =
             testOptions.overwriteCurrentSdkVersion;
@@ -662,14 +705,22 @@
     // platforms and independent of stdin/stderr.
     colors.enableColors = false;
 
-    ProcessedOptions options = createProcessedOptions(nnbdMode);
+    ProcessedOptions options = createProcessedOptions(
+        nnbdMode,
+        linkDependenciesOptions.allowedExperimentalFlags,
+        linkDependenciesOptions.experimentEnabledVersion,
+        linkDependenciesOptions.experimentReleasedVersion);
 
     if (linkDependenciesOptions.content.isNotEmpty &&
         linkDependenciesOptions.component == null) {
       // Compile linked dependency.
       ProcessedOptions linkOptions = options;
       if (linkDependenciesOptions.nnbdMode != null) {
-        linkOptions = createProcessedOptions(linkDependenciesOptions.nnbdMode);
+        linkOptions = createProcessedOptions(
+            linkDependenciesOptions.nnbdMode,
+            linkDependenciesOptions.allowedExperimentalFlags,
+            linkDependenciesOptions.experimentEnabledVersion,
+            linkDependenciesOptions.experimentReleasedVersion);
       }
       await CompilerContext.runWithOptions(linkOptions, (_) async {
         KernelTarget sourceTarget = await outlineInitialization(context,
diff --git a/pkg/front_end/test/incremental_load_from_dill_suite.dart b/pkg/front_end/test/incremental_load_from_dill_suite.dart
index 9131713..51255c1 100644
--- a/pkg/front_end/test/incremental_load_from_dill_suite.dart
+++ b/pkg/front_end/test/incremental_load_from_dill_suite.dart
@@ -65,7 +65,8 @@
         Name,
         Procedure,
         Supertype,
-        TreeNode;
+        TreeNode,
+        Version;
 
 import 'package:kernel/target/targets.dart'
     show NoneTarget, Target, TargetFlags;
@@ -332,6 +333,8 @@
   Component component3;
 
   String doStringReplacements(String input) {
+    Version enableNonNullableVersion =
+        experimentEnabledVersion[ExperimentalFlag.nonNullable];
     String output = input.replaceAll("%NNBD_VERSION_MARKER%",
         "${enableNonNullableVersion.major}.${enableNonNullableVersion.minor}");
     return output;
diff --git a/pkg/front_end/test/spell_checking_list_code.txt b/pkg/front_end/test/spell_checking_list_code.txt
index 32e6192..a83f2e5 100644
--- a/pkg/front_end/test/spell_checking_list_code.txt
+++ b/pkg/front_end/test/spell_checking_list_code.txt
@@ -745,6 +745,7 @@
 op
 opt
 optimizations
+opting
 option1
 option2
 opts
@@ -907,11 +908,13 @@
 relativize
 relax
 relaxes
+released
 relink
 remapped
 remedy
 removal
 remover
+render
 reparse
 repeating
 replacements
diff --git a/pkg/front_end/test/spell_checking_list_tests.txt b/pkg/front_end/test/spell_checking_list_tests.txt
index bf3dc81..448aa23 100644
--- a/pkg/front_end/test/spell_checking_list_tests.txt
+++ b/pkg/front_end/test/spell_checking_list_tests.txt
@@ -443,6 +443,7 @@
 outbound
 overlay
 pack
+paging
 party
 pause
 paused
@@ -500,6 +501,7 @@
 regenerate
 regressions
 reify
+released
 reload
 remap
 remaps
@@ -622,6 +624,7 @@
 untransformed
 untrimmed
 unusual
+unversioned
 upload
 uppercase
 upward
@@ -633,6 +636,7 @@
 val
 vars
 verbatim
+versioned
 versioning
 waited
 waiting
diff --git a/pkg/front_end/testcases/general/assert_super.dart b/pkg/front_end/testcases/general/assert_super.dart
new file mode 100644
index 0000000..93a32ef
--- /dev/null
+++ b/pkg/front_end/testcases/general/assert_super.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2020, 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.
+
+class Super {
+  bool get property => true;
+}
+
+class Class extends Super {
+  Class() : assert(property);
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/assert_super.dart.outline.expect b/pkg/front_end/testcases/general/assert_super.dart.outline.expect
new file mode 100644
index 0000000..309b5d0
--- /dev/null
+++ b/pkg/front_end/testcases/general/assert_super.dart.outline.expect
@@ -0,0 +1,26 @@
+library;
+import self as self;
+import "dart:core" as core;
+
+class Super extends core::Object {
+  synthetic constructor •() → self::Super*
+    ;
+  get property() → core::bool*
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Class extends self::Super {
+  constructor •() → self::Class*
+    ;
+}
+static method main() → dynamic
+  ;
diff --git a/pkg/front_end/testcases/general/assert_super.dart.strong.expect b/pkg/front_end/testcases/general/assert_super.dart.strong.expect
new file mode 100644
index 0000000..59fd8cc
--- /dev/null
+++ b/pkg/front_end/testcases/general/assert_super.dart.strong.expect
@@ -0,0 +1,27 @@
+library;
+import self as self;
+import "dart:core" as core;
+
+class Super extends core::Object {
+  synthetic constructor •() → self::Super*
+    : super core::Object::•()
+    ;
+  get property() → core::bool*
+    return true;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Class extends self::Super {
+  constructor •() → self::Class*
+    : assert(this.{self::Super::property}), super self::Super::•()
+    ;
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/assert_super.dart.strong.transformed.expect b/pkg/front_end/testcases/general/assert_super.dart.strong.transformed.expect
new file mode 100644
index 0000000..59fd8cc
--- /dev/null
+++ b/pkg/front_end/testcases/general/assert_super.dart.strong.transformed.expect
@@ -0,0 +1,27 @@
+library;
+import self as self;
+import "dart:core" as core;
+
+class Super extends core::Object {
+  synthetic constructor •() → self::Super*
+    : super core::Object::•()
+    ;
+  get property() → core::bool*
+    return true;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Class extends self::Super {
+  constructor •() → self::Class*
+    : assert(this.{self::Super::property}), super self::Super::•()
+    ;
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/assert_super.dart.textual_outline.expect b/pkg/front_end/testcases/general/assert_super.dart.textual_outline.expect
new file mode 100644
index 0000000..c320010
--- /dev/null
+++ b/pkg/front_end/testcases/general/assert_super.dart.textual_outline.expect
@@ -0,0 +1,9 @@
+class Super {
+  bool get property => true;
+}
+
+class Class extends Super {
+  Class() : assert(property);
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/assert_super.dart.textual_outline_modelled.expect b/pkg/front_end/testcases/general/assert_super.dart.textual_outline_modelled.expect
new file mode 100644
index 0000000..aa85ac3
--- /dev/null
+++ b/pkg/front_end/testcases/general/assert_super.dart.textual_outline_modelled.expect
@@ -0,0 +1,9 @@
+class Class extends Super {
+  Class() : assert(property);
+}
+
+class Super {
+  bool get property => true;
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/experiment_release_version/.dart_tool/package_config.json b/pkg/front_end/testcases/general/experiment_release_version/.dart_tool/package_config.json
new file mode 100644
index 0000000..bc435fb
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/.dart_tool/package_config.json
@@ -0,0 +1,18 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "allowed_package",
+      "rootUri": "../allowed_package/",
+      "packageUri": "lib/",
+      "languageVersion": "2.9"
+    },
+    {
+      "name": "not_allowed_package",
+      "rootUri": "../not_allowed_package/",
+      "packageUri": "lib/",
+      "languageVersion": "2.9"
+    }
+
+  ]
+}
\ No newline at end of file
diff --git a/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/unversioned_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/unversioned_lib.dart
new file mode 100644
index 0000000..d57287d
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/unversioned_lib.dart
@@ -0,0 +1,5 @@
+// Copyright (c) 2020, 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.
+
+int? versionedAllowedPackage; // ok
diff --git a/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_10_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_10_lib.dart
new file mode 100644
index 0000000..d432653
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_10_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.10
+
+int? versioned_2_10_AllowedPackage; // ok
diff --git a/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart
new file mode 100644
index 0000000..b3c0c6d
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.8
+
+int? versioned_2_8_AllowedPackage; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_9_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_9_lib.dart
new file mode 100644
index 0000000..2bf988c
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_9_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.9
+
+int? versionedAllowedPackage; // ok
\ No newline at end of file
diff --git a/pkg/front_end/testcases/general/experiment_release_version/link.options b/pkg/front_end/testcases/general/experiment_release_version/link.options
new file mode 100644
index 0000000..dd5d6af
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/link.options
@@ -0,0 +1 @@
+--fix-nnbd-release-version
\ No newline at end of file
diff --git a/pkg/front_end/testcases/general/experiment_release_version/main.dart b/pkg/front_end/testcases/general/experiment_release_version/main.dart
new file mode 100644
index 0000000..40552ae
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/main.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2020, 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.
+
+import 'package:allowed_package/unversioned_lib.dart';
+import 'package:allowed_package/versioned_2_8_lib.dart';
+import 'package:allowed_package/versioned_2_9_lib.dart';
+import 'package:allowed_package/versioned_2_10_lib.dart';
+import 'package:not_allowed_package/unversioned_lib.dart';
+import 'package:not_allowed_package/versioned_2_8_lib.dart';
+import 'package:not_allowed_package/versioned_2_9_lib.dart';
+import 'package:not_allowed_package/versioned_2_10_lib.dart';
+import 'unversioned_lib.dart';
+import 'versioned_2_8_lib.dart';
+import 'versioned_2_9_lib.dart';
+import 'versioned_2_10_lib.dart';
+
+main() {}
diff --git a/pkg/front_end/testcases/general/experiment_release_version/main.dart.outline.expect b/pkg/front_end/testcases/general/experiment_release_version/main.dart.outline.expect
new file mode 100644
index 0000000..d326d68
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/main.dart.outline.expect
@@ -0,0 +1,105 @@
+//
+// Problems outside component:
+//
+// pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.9 or higher.
+// int? versioned_2_8_AllowedPackage; // error
+//    ^
+// pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.8
+// ^^^^^^^^^^^^
+//
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versionedUnallowedPackage; // error
+//    ^
+//
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_8_AllowedPackage; // error
+//    ^
+//
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_9_AllowedPackage; // error
+//    ^
+//
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versionedAllowedPackage; // error
+//    ^
+//
+library;
+import self as self;
+
+import "package:allowed_package/unversioned_lib.dart";
+import "package:allowed_package/versioned_2_8_lib.dart";
+import "package:allowed_package/versioned_2_9_lib.dart";
+import "package:allowed_package/versioned_2_10_lib.dart";
+import "package:not_allowed_package/unversioned_lib.dart";
+import "package:not_allowed_package/versioned_2_8_lib.dart";
+import "package:not_allowed_package/versioned_2_9_lib.dart";
+import "package:not_allowed_package/versioned_2_10_lib.dart";
+import "org-dartlang-testcase:///unversioned_lib.dart";
+import "org-dartlang-testcase:///versioned_2_8_lib.dart";
+import "org-dartlang-testcase:///versioned_2_9_lib.dart";
+import "org-dartlang-testcase:///versioned_2_10_lib.dart";
+
+static method main() → dynamic
+  ;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? unversionedLibrary; // error
+//    ^
+//
+import self as self2;
+import "dart:core" as core;
+
+static field core::int? unversionedLibrary;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_8_Library; // error
+//    ^
+//
+import self as self3;
+import "dart:core" as core;
+
+static field core::int? versioned_2_8_Library;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_9_Library; // error
+//    ^
+//
+import self as self4;
+import "dart:core" as core;
+
+static field core::int? versioned_2_9_Library;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_10_Library; // error
+//    ^
+//
+import self as self5;
+import "dart:core" as core;
+
+static field core::int? versioned_2_10_Library;
diff --git a/pkg/front_end/testcases/general/experiment_release_version/main.dart.strong.expect b/pkg/front_end/testcases/general/experiment_release_version/main.dart.strong.expect
new file mode 100644
index 0000000..ee91545
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/main.dart.strong.expect
@@ -0,0 +1,104 @@
+//
+// Problems outside component:
+//
+// pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.9 or higher.
+// int? versioned_2_8_AllowedPackage; // error
+//    ^
+// pkg/front_end/testcases/general/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.8
+// ^^^^^^^^^^^^
+//
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versionedUnallowedPackage; // error
+//    ^
+//
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_8_AllowedPackage; // error
+//    ^
+//
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_9_AllowedPackage; // error
+//    ^
+//
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versionedAllowedPackage; // error
+//    ^
+//
+library;
+import self as self;
+
+import "package:allowed_package/unversioned_lib.dart";
+import "package:allowed_package/versioned_2_8_lib.dart";
+import "package:allowed_package/versioned_2_9_lib.dart";
+import "package:allowed_package/versioned_2_10_lib.dart";
+import "package:not_allowed_package/unversioned_lib.dart";
+import "package:not_allowed_package/versioned_2_8_lib.dart";
+import "package:not_allowed_package/versioned_2_9_lib.dart";
+import "package:not_allowed_package/versioned_2_10_lib.dart";
+import "org-dartlang-testcase:///unversioned_lib.dart";
+import "org-dartlang-testcase:///versioned_2_8_lib.dart";
+import "org-dartlang-testcase:///versioned_2_9_lib.dart";
+import "org-dartlang-testcase:///versioned_2_10_lib.dart";
+
+static method main() → dynamic {}
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? unversionedLibrary; // error
+//    ^
+//
+import self as self2;
+import "dart:core" as core;
+
+static field core::int? unversionedLibrary;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_8_Library; // error
+//    ^
+//
+import self as self3;
+import "dart:core" as core;
+
+static field core::int? versioned_2_8_Library;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_9_Library; // error
+//    ^
+//
+import self as self4;
+import "dart:core" as core;
+
+static field core::int? versioned_2_9_Library;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_10_Library; // error
+//    ^
+//
+import self as self5;
+import "dart:core" as core;
+
+static field core::int? versioned_2_10_Library;
diff --git a/pkg/front_end/testcases/general/experiment_release_version/main.dart.strong.transformed.expect b/pkg/front_end/testcases/general/experiment_release_version/main.dart.strong.transformed.expect
new file mode 100644
index 0000000..29a26a3
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/main.dart.strong.transformed.expect
@@ -0,0 +1,73 @@
+library;
+import self as self;
+
+import "package:allowed_package/unversioned_lib.dart";
+import "package:allowed_package/versioned_2_8_lib.dart";
+import "package:allowed_package/versioned_2_9_lib.dart";
+import "package:allowed_package/versioned_2_10_lib.dart";
+import "package:not_allowed_package/unversioned_lib.dart";
+import "package:not_allowed_package/versioned_2_8_lib.dart";
+import "package:not_allowed_package/versioned_2_9_lib.dart";
+import "package:not_allowed_package/versioned_2_10_lib.dart";
+import "org-dartlang-testcase:///unversioned_lib.dart";
+import "org-dartlang-testcase:///versioned_2_8_lib.dart";
+import "org-dartlang-testcase:///versioned_2_9_lib.dart";
+import "org-dartlang-testcase:///versioned_2_10_lib.dart";
+
+static method main() → dynamic {}
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? unversionedLibrary; // error
+//    ^
+//
+import self as self2;
+import "dart:core" as core;
+
+static field core::int? unversionedLibrary;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_8_Library; // error
+//    ^
+//
+import self as self3;
+import "dart:core" as core;
+
+static field core::int? versioned_2_8_Library;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.10 or higher.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_9_Library; // error
+//    ^
+//
+import self as self4;
+import "dart:core" as core;
+
+static field core::int? versioned_2_9_Library;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
+// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// int? versioned_2_10_Library; // error
+//    ^
+//
+import self as self5;
+import "dart:core" as core;
+
+static field core::int? versioned_2_10_Library;
diff --git a/pkg/front_end/testcases/general/experiment_release_version/main.dart.textual_outline.expect b/pkg/front_end/testcases/general/experiment_release_version/main.dart.textual_outline.expect
new file mode 100644
index 0000000..d918938
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/main.dart.textual_outline.expect
@@ -0,0 +1,14 @@
+import 'package:allowed_package/unversioned_lib.dart';
+import 'package:allowed_package/versioned_2_8_lib.dart';
+import 'package:allowed_package/versioned_2_9_lib.dart';
+import 'package:allowed_package/versioned_2_10_lib.dart';
+import 'package:not_allowed_package/unversioned_lib.dart';
+import 'package:not_allowed_package/versioned_2_8_lib.dart';
+import 'package:not_allowed_package/versioned_2_9_lib.dart';
+import 'package:not_allowed_package/versioned_2_10_lib.dart';
+import 'unversioned_lib.dart';
+import 'versioned_2_8_lib.dart';
+import 'versioned_2_9_lib.dart';
+import 'versioned_2_10_lib.dart';
+
+main() {}
diff --git a/pkg/front_end/testcases/general/experiment_release_version/main.dart.textual_outline_modelled.expect b/pkg/front_end/testcases/general/experiment_release_version/main.dart.textual_outline_modelled.expect
new file mode 100644
index 0000000..9733a7a
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/main.dart.textual_outline_modelled.expect
@@ -0,0 +1,14 @@
+import 'package:allowed_package/unversioned_lib.dart';
+import 'package:allowed_package/versioned_2_10_lib.dart';
+import 'package:allowed_package/versioned_2_8_lib.dart';
+import 'package:allowed_package/versioned_2_9_lib.dart';
+import 'package:not_allowed_package/unversioned_lib.dart';
+import 'package:not_allowed_package/versioned_2_10_lib.dart';
+import 'package:not_allowed_package/versioned_2_8_lib.dart';
+import 'package:not_allowed_package/versioned_2_9_lib.dart';
+import 'unversioned_lib.dart';
+import 'versioned_2_10_lib.dart';
+import 'versioned_2_8_lib.dart';
+import 'versioned_2_9_lib.dart';
+
+main() {}
diff --git a/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart
new file mode 100644
index 0000000..10bfda8
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart
@@ -0,0 +1,5 @@
+// Copyright (c) 2020, 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.
+
+int? versionedUnallowedPackage; // error
diff --git a/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart
new file mode 100644
index 0000000..ee923a2
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.10
+
+int? versionedAllowedPackage; // error
diff --git a/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart
new file mode 100644
index 0000000..b3c0c6d
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.8
+
+int? versioned_2_8_AllowedPackage; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart
new file mode 100644
index 0000000..ff693f6
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.9
+
+int? versioned_2_9_AllowedPackage; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart
new file mode 100644
index 0000000..c2b3d3e
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart
@@ -0,0 +1,5 @@
+// Copyright (c) 2020, 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.
+
+int? unversionedLibrary; // error
diff --git a/pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart
new file mode 100644
index 0000000..a034e24
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.10
+
+int? versioned_2_10_Library; // error
diff --git a/pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart
new file mode 100644
index 0000000..83fa3c6
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.8
+
+int? versioned_2_8_Library; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart b/pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart
new file mode 100644
index 0000000..7a9a3ee
--- /dev/null
+++ b/pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.9
+
+int? versioned_2_9_Library; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/general/field_initializer_capture_this.dart b/pkg/front_end/testcases/general/field_initializer_capture_this.dart
new file mode 100644
index 0000000..80fe36c
--- /dev/null
+++ b/pkg/front_end/testcases/general/field_initializer_capture_this.dart
@@ -0,0 +1,10 @@
+// Copyright (c) 2020, 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.
+
+class Class {
+  var f = () => x; // error
+  var x;
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/field_initializer_capture_this.dart.outline.expect b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.outline.expect
new file mode 100644
index 0000000..baf707f
--- /dev/null
+++ b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.outline.expect
@@ -0,0 +1,29 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/field_initializer_capture_this.dart:6:17: Error: Can't access 'this' in a field initializer to read 'x'.
+//   var f = () => x; // error
+//                 ^
+//
+import self as self;
+import "dart:core" as core;
+
+class Class extends core::Object {
+  field () →* dynamic f;
+  field dynamic x;
+  synthetic constructor •() → self::Class*
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+static method main() → dynamic
+  ;
diff --git a/pkg/front_end/testcases/general/field_initializer_capture_this.dart.strong.expect b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.strong.expect
new file mode 100644
index 0000000..714a3fd
--- /dev/null
+++ b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.strong.expect
@@ -0,0 +1,31 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/field_initializer_capture_this.dart:6:17: Error: Can't access 'this' in a field initializer to read 'x'.
+//   var f = () => x; // error
+//                 ^
+//
+import self as self;
+import "dart:core" as core;
+
+class Class extends core::Object {
+  field () →* dynamic f = () → dynamic => invalid-expression "pkg/front_end/testcases/general/field_initializer_capture_this.dart:6:17: Error: Can't access 'this' in a field initializer to read 'x'.
+  var f = () => x; // error
+                ^";
+  field dynamic x = null;
+  synthetic constructor •() → self::Class*
+    : super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/field_initializer_capture_this.dart.strong.transformed.expect b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.strong.transformed.expect
new file mode 100644
index 0000000..714a3fd
--- /dev/null
+++ b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.strong.transformed.expect
@@ -0,0 +1,31 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/field_initializer_capture_this.dart:6:17: Error: Can't access 'this' in a field initializer to read 'x'.
+//   var f = () => x; // error
+//                 ^
+//
+import self as self;
+import "dart:core" as core;
+
+class Class extends core::Object {
+  field () →* dynamic f = () → dynamic => invalid-expression "pkg/front_end/testcases/general/field_initializer_capture_this.dart:6:17: Error: Can't access 'this' in a field initializer to read 'x'.
+  var f = () => x; // error
+                ^";
+  field dynamic x = null;
+  synthetic constructor •() → self::Class*
+    : super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/field_initializer_capture_this.dart.textual_outline.expect b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.textual_outline.expect
new file mode 100644
index 0000000..a0d1d0e
--- /dev/null
+++ b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.textual_outline.expect
@@ -0,0 +1,6 @@
+class Class {
+  var f = () => x;
+  var x;
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/field_initializer_capture_this.dart.textual_outline_modelled.expect b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.textual_outline_modelled.expect
new file mode 100644
index 0000000..a0d1d0e
--- /dev/null
+++ b/pkg/front_end/testcases/general/field_initializer_capture_this.dart.textual_outline_modelled.expect
@@ -0,0 +1,6 @@
+class Class {
+  var f = () => x;
+  var x;
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/flutter_issue64155.dart b/pkg/front_end/testcases/general/flutter_issue64155.dart
new file mode 100644
index 0000000..6274977
--- /dev/null
+++ b/pkg/front_end/testcases/general/flutter_issue64155.dart
@@ -0,0 +1,53 @@
+// Copyright (c) 2020, 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.
+
+mixin TestMixin<R, T> {
+  Future<T> test(Future<R> fetch) async {
+    final response = await fetch;
+    T result;
+    if (response is Response) {
+      result = response.data;
+    } else if (response is PagingResponse) {
+      result = response.data.data as T;
+    } else if (response is T) {
+      result = response;
+    } else {
+      throw Exception('Invalid response type');
+    }
+    return result;
+  }
+}
+
+class PagingResponse<T> {
+  final PagingResponseData<T> data;
+
+  PagingResponse(this.data);
+}
+
+class PagingResponseData<T> {
+  final List<T> data;
+
+  PagingResponseData(this.data);
+}
+
+class Response<T> {
+  final T data;
+  Response(this.data);
+}
+
+class Class1 with TestMixin<Response<String>, String> {
+  _test() {
+    final response = Response<String>('test');
+    test(Future.value(response));
+  }
+}
+
+class Class2 with TestMixin<PagingResponse<String>, String> {
+  _test() {
+    final response = PagingResponse<String>(PagingResponseData(['test']));
+    test(Future.value(response));
+  }
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/flutter_issue64155.dart.outline.expect b/pkg/front_end/testcases/general/flutter_issue64155.dart.outline.expect
new file mode 100644
index 0000000..3587c68
--- /dev/null
+++ b/pkg/front_end/testcases/general/flutter_issue64155.dart.outline.expect
@@ -0,0 +1,108 @@
+library;
+import self as self;
+import "dart:core" as core;
+import "dart:async" as asy;
+
+abstract class TestMixin<R extends core::Object* = dynamic, T extends core::Object* = dynamic> extends core::Object /*isMixinDeclaration*/  {
+  method test(generic-covariant-impl asy::Future<self::TestMixin::R*>* fetch) → asy::Future<self::TestMixin::T*>* async 
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class PagingResponse<T extends core::Object* = dynamic> extends core::Object {
+  final field self::PagingResponseData<self::PagingResponse::T*>* data;
+  constructor •(self::PagingResponseData<self::PagingResponse::T*>* data) → self::PagingResponse<self::PagingResponse::T*>*
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class PagingResponseData<T extends core::Object* = dynamic> extends core::Object {
+  final field core::List<self::PagingResponseData::T*>* data;
+  constructor •(core::List<self::PagingResponseData::T*>* data) → self::PagingResponseData<self::PagingResponseData::T*>*
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Response<T extends core::Object* = dynamic> extends core::Object {
+  final field self::Response::T* data;
+  constructor •(self::Response::T* data) → self::Response<self::Response::T*>*
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+abstract class _Class1&Object&TestMixin = core::Object with self::TestMixin<self::Response<core::String*>*, core::String*> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class1&Object&TestMixin*
+    : super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Class1 extends self::_Class1&Object&TestMixin {
+  synthetic constructor •() → self::Class1*
+    ;
+  method _test() → dynamic
+    ;
+}
+abstract class _Class2&Object&TestMixin = core::Object with self::TestMixin<self::PagingResponse<core::String*>*, core::String*> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class2&Object&TestMixin*
+    : super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Class2 extends self::_Class2&Object&TestMixin {
+  synthetic constructor •() → self::Class2*
+    ;
+  method _test() → dynamic
+    ;
+}
+static method main() → dynamic
+  ;
diff --git a/pkg/front_end/testcases/general/flutter_issue64155.dart.strong.expect b/pkg/front_end/testcases/general/flutter_issue64155.dart.strong.expect
new file mode 100644
index 0000000..299c36f
--- /dev/null
+++ b/pkg/front_end/testcases/general/flutter_issue64155.dart.strong.expect
@@ -0,0 +1,133 @@
+library;
+import self as self;
+import "dart:core" as core;
+import "dart:async" as asy;
+
+abstract class TestMixin<R extends core::Object* = dynamic, T extends core::Object* = dynamic> extends core::Object /*isMixinDeclaration*/  {
+  method test(generic-covariant-impl asy::Future<self::TestMixin::R*>* fetch) → asy::Future<self::TestMixin::T*>* async {
+    final self::TestMixin::R* response = await fetch;
+    self::TestMixin::T* result;
+    if(response is self::Response<dynamic>*) {
+      result = response{self::TestMixin::R* & self::Response<dynamic>* /* '*' & '*' = '*' */}.{self::Response::data} as{TypeError,ForDynamic} self::TestMixin::T*;
+    }
+    else
+      if(response is self::PagingResponse<dynamic>*) {
+        result = response{self::TestMixin::R* & self::PagingResponse<dynamic>* /* '*' & '*' = '*' */}.{self::PagingResponse::data}.{self::PagingResponseData::data} as self::TestMixin::T*;
+      }
+      else
+        if(response is self::TestMixin::T*) {
+          result = response{self::TestMixin::R* & self::TestMixin::T* /* '*' & '*' = '*' */};
+        }
+        else {
+          throw core::Exception::•("Invalid response type");
+        }
+    return result;
+  }
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class PagingResponse<T extends core::Object* = dynamic> extends core::Object {
+  final field self::PagingResponseData<self::PagingResponse::T*>* data;
+  constructor •(self::PagingResponseData<self::PagingResponse::T*>* data) → self::PagingResponse<self::PagingResponse::T*>*
+    : self::PagingResponse::data = data, super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class PagingResponseData<T extends core::Object* = dynamic> extends core::Object {
+  final field core::List<self::PagingResponseData::T*>* data;
+  constructor •(core::List<self::PagingResponseData::T*>* data) → self::PagingResponseData<self::PagingResponseData::T*>*
+    : self::PagingResponseData::data = data, super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Response<T extends core::Object* = dynamic> extends core::Object {
+  final field self::Response::T* data;
+  constructor •(self::Response::T* data) → self::Response<self::Response::T*>*
+    : self::Response::data = data, super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+abstract class _Class1&Object&TestMixin = core::Object with self::TestMixin<self::Response<core::String*>*, core::String*> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class1&Object&TestMixin*
+    : super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Class1 extends self::_Class1&Object&TestMixin {
+  synthetic constructor •() → self::Class1*
+    : super self::_Class1&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::Response<core::String*>* response = new self::Response::•<core::String*>("test");
+    this.{self::TestMixin::test}(asy::Future::value<self::Response<core::String*>*>(response));
+  }
+}
+abstract class _Class2&Object&TestMixin = core::Object with self::TestMixin<self::PagingResponse<core::String*>*, core::String*> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class2&Object&TestMixin*
+    : super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Class2 extends self::_Class2&Object&TestMixin {
+  synthetic constructor •() → self::Class2*
+    : super self::_Class2&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::PagingResponse<core::String*>* response = new self::PagingResponse::•<core::String*>(new self::PagingResponseData::•<core::String*>(<core::String*>["test"]));
+    this.{self::TestMixin::test}(asy::Future::value<self::PagingResponse<core::String*>*>(response));
+  }
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/flutter_issue64155.dart.strong.transformed.expect b/pkg/front_end/testcases/general/flutter_issue64155.dart.strong.transformed.expect
new file mode 100644
index 0000000..b2d6c42
--- /dev/null
+++ b/pkg/front_end/testcases/general/flutter_issue64155.dart.strong.transformed.expect
@@ -0,0 +1,250 @@
+library;
+import self as self;
+import "dart:core" as core;
+import "dart:async" as asy;
+import "dart:_internal" as _in;
+
+abstract class TestMixin<R extends core::Object* = dynamic, T extends core::Object* = dynamic> extends core::Object /*isMixinDeclaration*/  {
+  method test(generic-covariant-impl asy::Future<self::TestMixin::R*>* fetch) → asy::Future<self::TestMixin::T*>* /* originally async */ {
+    final asy::_AsyncAwaitCompleter<self::TestMixin::T*>* :async_completer = new asy::_AsyncAwaitCompleter::•<self::TestMixin::T*>();
+    FutureOr<self::TestMixin::T*>* :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) →* dynamic :async_op_then;
+    (core::Object*, core::StackTrace*) →* dynamic :async_op_error;
+    core::int* :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L1:
+        {
+          [yield] let dynamic #t1 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::TestMixin::R* response = _in::unsafeCast<self::TestMixin::R*>(:result);
+          self::TestMixin::T* result;
+          if(response is self::Response<dynamic>*) {
+            result = response{self::TestMixin::R* & self::Response<dynamic>* /* '*' & '*' = '*' */}.{self::Response::data} as{TypeError,ForDynamic} self::TestMixin::T*;
+          }
+          else
+            if(response is self::PagingResponse<dynamic>*) {
+              result = response{self::TestMixin::R* & self::PagingResponse<dynamic>* /* '*' & '*' = '*' */}.{self::PagingResponse::data}.{self::PagingResponseData::data} as self::TestMixin::T*;
+            }
+            else
+              if(response is self::TestMixin::T*) {
+                result = response{self::TestMixin::R* & self::TestMixin::T* /* '*' & '*' = '*' */};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L1;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace* stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class PagingResponse<T extends core::Object* = dynamic> extends core::Object {
+  final field self::PagingResponseData<self::PagingResponse::T*>* data;
+  constructor •(self::PagingResponseData<self::PagingResponse::T*>* data) → self::PagingResponse<self::PagingResponse::T*>*
+    : self::PagingResponse::data = data, super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class PagingResponseData<T extends core::Object* = dynamic> extends core::Object {
+  final field core::List<self::PagingResponseData::T*>* data;
+  constructor •(core::List<self::PagingResponseData::T*>* data) → self::PagingResponseData<self::PagingResponseData::T*>*
+    : self::PagingResponseData::data = data, super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+class Response<T extends core::Object* = dynamic> extends core::Object {
+  final field self::Response::T* data;
+  constructor •(self::Response::T* data) → self::Response<self::Response::T*>*
+    : self::Response::data = data, super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+}
+abstract class _Class1&Object&TestMixin extends core::Object implements self::TestMixin<self::Response<core::String*>*, core::String*> /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class1&Object&TestMixin*
+    : super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+  method test(generic-covariant-impl asy::Future<self::Response<core::String*>*>* fetch) → asy::Future<core::String*>* /* originally async */ {
+    final asy::_AsyncAwaitCompleter<core::String*>* :async_completer = new asy::_AsyncAwaitCompleter::•<core::String*>();
+    FutureOr<core::String*>* :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) →* dynamic :async_op_then;
+    (core::Object*, core::StackTrace*) →* dynamic :async_op_error;
+    core::int* :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L2:
+        {
+          [yield] let dynamic #t2 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::Response<core::String*>* response = _in::unsafeCast<self::Response<core::String*>*>(:result);
+          core::String* result;
+          if(response is self::Response<dynamic>*) {
+            result = response{self::Response<core::String*>*}.{self::Response::data};
+          }
+          else
+            if(response is self::PagingResponse<dynamic>*) {
+              result = response{self::Response<core::String*>*}.{self::PagingResponse::data}.{self::PagingResponseData::data} as core::String*;
+            }
+            else
+              if(response is core::String*) {
+                result = response{self::Response<core::String*>*};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L2;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace* stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+}
+class Class1 extends self::_Class1&Object&TestMixin {
+  synthetic constructor •() → self::Class1*
+    : super self::_Class1&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::Response<core::String*>* response = new self::Response::•<core::String*>("test");
+    this.{self::TestMixin::test}(asy::Future::value<self::Response<core::String*>*>(response));
+  }
+}
+abstract class _Class2&Object&TestMixin extends core::Object implements self::TestMixin<self::PagingResponse<core::String*>*, core::String*> /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class2&Object&TestMixin*
+    : super core::Object::•()
+    ;
+  abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode
+  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf
+  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf
+  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue
+  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse
+  abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
+  abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
+  abstract member-signature method toString() → core::String*; -> core::Object::toString
+  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
+  abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
+  method test(generic-covariant-impl asy::Future<self::PagingResponse<core::String*>*>* fetch) → asy::Future<core::String*>* /* originally async */ {
+    final asy::_AsyncAwaitCompleter<core::String*>* :async_completer = new asy::_AsyncAwaitCompleter::•<core::String*>();
+    FutureOr<core::String*>* :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) →* dynamic :async_op_then;
+    (core::Object*, core::StackTrace*) →* dynamic :async_op_error;
+    core::int* :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L3:
+        {
+          [yield] let dynamic #t3 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::PagingResponse<core::String*>* response = _in::unsafeCast<self::PagingResponse<core::String*>*>(:result);
+          core::String* result;
+          if(response is self::Response<dynamic>*) {
+            result = response{self::PagingResponse<core::String*>*}.{self::Response::data} as{TypeError,ForDynamic} core::String*;
+          }
+          else
+            if(response is self::PagingResponse<dynamic>*) {
+              result = response{self::PagingResponse<core::String*>*}.{self::PagingResponse::data}.{self::PagingResponseData::data} as core::String*;
+            }
+            else
+              if(response is core::String*) {
+                result = response{self::PagingResponse<core::String*>*};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L3;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace* stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+}
+class Class2 extends self::_Class2&Object&TestMixin {
+  synthetic constructor •() → self::Class2*
+    : super self::_Class2&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::PagingResponse<core::String*>* response = new self::PagingResponse::•<core::String*>(new self::PagingResponseData::•<core::String*>(<core::String*>["test"]));
+    this.{self::TestMixin::test}(asy::Future::value<self::PagingResponse<core::String*>*>(response));
+  }
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/flutter_issue64155.dart.textual_outline.expect b/pkg/front_end/testcases/general/flutter_issue64155.dart.textual_outline.expect
new file mode 100644
index 0000000..0688f3b
--- /dev/null
+++ b/pkg/front_end/testcases/general/flutter_issue64155.dart.textual_outline.expect
@@ -0,0 +1,28 @@
+mixin TestMixin<R, T> {
+  Future<T> test(Future<R> fetch) async {}
+}
+
+class PagingResponse<T> {
+  final PagingResponseData<T> data;
+  PagingResponse(this.data);
+}
+
+class PagingResponseData<T> {
+  final List<T> data;
+  PagingResponseData(this.data);
+}
+
+class Response<T> {
+  final T data;
+  Response(this.data);
+}
+
+class Class1 with TestMixin<Response<String>, String> {
+  _test() {}
+}
+
+class Class2 with TestMixin<PagingResponse<String>, String> {
+  _test() {}
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/flutter_issue64155.dart.textual_outline_modelled.expect b/pkg/front_end/testcases/general/flutter_issue64155.dart.textual_outline_modelled.expect
new file mode 100644
index 0000000..1440e80
--- /dev/null
+++ b/pkg/front_end/testcases/general/flutter_issue64155.dart.textual_outline_modelled.expect
@@ -0,0 +1,27 @@
+class Class1 with TestMixin<Response<String>, String> {
+  _test() {}
+}
+
+class Class2 with TestMixin<PagingResponse<String>, String> {
+  _test() {}
+}
+
+class PagingResponse<T> {
+  PagingResponse(this.data);
+  final PagingResponseData<T> data;
+}
+
+class PagingResponseData<T> {
+  PagingResponseData(this.data);
+  final List<T> data;
+}
+
+class Response<T> {
+  Response(this.data);
+  final T data;
+}
+
+main() {}
+mixin TestMixin<R, T> {
+  Future<T> test(Future<R> fetch) async {}
+}
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart
index 6a2269e..f102ccb 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart
@@ -2,6 +2,20 @@
 // 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.
 
+class B {
+  final int x;
+
+  B(this.x);
+}
+
+class C extends B {
+  late final y = x + 1;
+
+  C(int x) : super(x);
+
+  method() => x;
+}
+
 int? lateTopLevelField1Init;
 int initLateTopLevelField1(int value) {
   return lateTopLevelField1Init = value;
@@ -97,6 +111,7 @@
   expect(87, Extension.lateExtensionField1Init);
 
   Extension.staticMethod();
+  expect(2, C(1).y);
 }
 
 expect(expected, actual) {
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.outline.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.outline.expect
index 1bf3e67..f9ebcad 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.outline.expect
@@ -2,6 +2,20 @@
 import self as self;
 import "dart:core" as core;
 
+class B extends core::Object {
+  final field core::int x;
+  constructor •(core::int x) → self::B
+    ;
+}
+class C extends self::B {
+  field core::int? _#C#y;
+  field core::bool _#C#y#isSet;
+  constructor •(core::int x) → self::C
+    ;
+  get y() → core::int;
+  method method() → dynamic
+    ;
+}
 class Class<T extends core::Object? = dynamic> extends core::Object {
   static field core::int? lateStaticField1Init;
   static field core::int? _#lateStaticField1;
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.expect
index 850426a..e1e5f51 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.expect
@@ -3,6 +3,23 @@
 import "dart:core" as core;
 import "dart:_internal" as _in;
 
+class B extends core::Object {
+  final field core::int x;
+  constructor •(core::int x) → self::B
+    : self::B::x = x, super core::Object::•()
+    ;
+}
+class C extends self::B {
+  field core::int? _#C#y = null;
+  field core::bool _#C#y#isSet = false;
+  constructor •(core::int x) → self::C
+    : super self::B::•(x)
+    ;
+  get y() → core::int
+    return let final core::int? #t1 = this.{self::C::_#C#y} in #t1.==(null) ?{core::int} let final core::int #t2 = this.{self::B::x}.{core::num::+}(1) in this.{self::C::_#C#y}.==(null) ?{core::int} this.{self::C::_#C#y} = #t2 : throw new _in::LateInitializationErrorImpl::•("Field 'y' has been assigned during initialization.") : #t1{core::int};
+  method method() → dynamic
+    return this.{self::B::x};
+}
 class Class<T extends core::Object? = dynamic> extends core::Object {
   static field core::int? lateStaticField1Init = null;
   static field core::int? _#lateStaticField1 = null;
@@ -21,12 +38,12 @@
     return self::Class::lateStaticField1Init = value;
   }
   static get lateStaticField1() → core::int
-    return let final core::int? #t1 = self::Class::_#lateStaticField1 in #t1.==(null) ?{core::int} let final core::int #t2 = self::Class::initLateStaticField1(87) in self::Class::_#lateStaticField1.==(null) ?{core::int} self::Class::_#lateStaticField1 = #t2 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField1' has been assigned during initialization.") : #t1{core::int};
+    return let final core::int? #t3 = self::Class::_#lateStaticField1 in #t3.==(null) ?{core::int} let final core::int #t4 = self::Class::initLateStaticField1(87) in self::Class::_#lateStaticField1.==(null) ?{core::int} self::Class::_#lateStaticField1 = #t4 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField1' has been assigned during initialization.") : #t3{core::int};
   static method initLateStaticField2(core::int value) → core::int {
     return self::Class::lateStaticField2Init = value;
   }
   static get lateStaticField2() → core::int
-    return let final core::int? #t3 = self::Class::_#lateStaticField2 in #t3.==(null) ?{core::int} let final core::int #t4 = self::Class::initLateStaticField2(42) in self::Class::_#lateStaticField2.==(null) ?{core::int} self::Class::_#lateStaticField2 = #t4 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField2' has been assigned during initialization.") : #t3{core::int};
+    return let final core::int? #t5 = self::Class::_#lateStaticField2 in #t5.==(null) ?{core::int} let final core::int #t6 = self::Class::initLateStaticField2(42) in self::Class::_#lateStaticField2.==(null) ?{core::int} self::Class::_#lateStaticField2 = #t6 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField2' has been assigned during initialization.") : #t5{core::int};
   static method staticMethod() → dynamic {
     self::expect(null, self::Class::lateStaticField2Init);
     self::expect(42, self::Class::lateStaticField2);
@@ -36,19 +53,19 @@
     return this.{self::Class::lateInstanceFieldInit} = value;
   }
   get lateInstanceField() → core::int
-    return let final core::int? #t5 = this.{self::Class::_#Class#lateInstanceField} in #t5.==(null) ?{core::int} let final core::int #t6 = this.{self::Class::initLateInstanceField}(16) in this.{self::Class::_#Class#lateInstanceField}.==(null) ?{core::int} this.{self::Class::_#Class#lateInstanceField} = #t6 : throw new _in::LateInitializationErrorImpl::•("Field 'lateInstanceField' has been assigned during initialization.") : #t5{core::int};
+    return let final core::int? #t7 = this.{self::Class::_#Class#lateInstanceField} in #t7.==(null) ?{core::int} let final core::int #t8 = this.{self::Class::initLateInstanceField}(16) in this.{self::Class::_#Class#lateInstanceField}.==(null) ?{core::int} this.{self::Class::_#Class#lateInstanceField} = #t8 : throw new _in::LateInitializationErrorImpl::•("Field 'lateInstanceField' has been assigned during initialization.") : #t7{core::int};
   method initLateGenericField(generic-covariant-impl self::Class::T% value) → self::Class::T% {
     return this.{self::Class::lateGenericFieldInit} = value;
   }
   get lateGenericField() → self::Class::T% {
     if(!this.{self::Class::_#Class#lateGenericField#isSet}) {
-      final self::Class::T% #t7 = this.{self::Class::initLateGenericField}(this.{self::Class::field});
+      final self::Class::T% #t9 = this.{self::Class::initLateGenericField}(this.{self::Class::field});
       if(this.{self::Class::_#Class#lateGenericField#isSet})
         throw new _in::LateInitializationErrorImpl::•("Field 'lateGenericField' has been assigned during initialization.");
-      this.{self::Class::_#Class#lateGenericField} = #t7;
+      this.{self::Class::_#Class#lateGenericField} = #t9;
       this.{self::Class::_#Class#lateGenericField#isSet} = true;
     }
-    return let final self::Class::T? #t8 = this.{self::Class::_#Class#lateGenericField} in #t8{self::Class::T%};
+    return let final self::Class::T? #t10 = this.{self::Class::_#Class#lateGenericField} in #t10{self::Class::T%};
   }
   method instanceMethod() → dynamic {
     self::expect(null, this.{self::Class::lateInstanceFieldInit});
@@ -80,17 +97,17 @@
   return self::lateTopLevelField1Init = value;
 }
 static get lateTopLevelField1() → core::int
-  return let final core::int? #t9 = self::_#lateTopLevelField1 in #t9.==(null) ?{core::int} let final core::int #t10 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1.==(null) ?{core::int} self::_#lateTopLevelField1 = #t10 : throw new _in::LateInitializationErrorImpl::•("Field 'lateTopLevelField1' has been assigned during initialization.") : #t9{core::int};
+  return let final core::int? #t11 = self::_#lateTopLevelField1 in #t11.==(null) ?{core::int} let final core::int #t12 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1.==(null) ?{core::int} self::_#lateTopLevelField1 = #t12 : throw new _in::LateInitializationErrorImpl::•("Field 'lateTopLevelField1' has been assigned during initialization.") : #t11{core::int};
 static method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
 static get Extension|lateExtensionField1() → core::int
-  return let final core::int? #t11 = self::_#Extension|lateExtensionField1 in #t11.==(null) ?{core::int} let final core::int #t12 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1.==(null) ?{core::int} self::_#Extension|lateExtensionField1 = #t12 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField1' has been assigned during initialization.") : #t11{core::int};
+  return let final core::int? #t13 = self::_#Extension|lateExtensionField1 in #t13.==(null) ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1.==(null) ?{core::int} self::_#Extension|lateExtensionField1 = #t14 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField1' has been assigned during initialization.") : #t13{core::int};
 static method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
 static get Extension|lateExtensionField2() → core::int
-  return let final core::int? #t13 = self::_#Extension|lateExtensionField2 in #t13.==(null) ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2.==(null) ?{core::int} self::_#Extension|lateExtensionField2 = #t14 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField2' has been assigned during initialization.") : #t13{core::int};
+  return let final core::int? #t15 = self::_#Extension|lateExtensionField2 in #t15.==(null) ?{core::int} let final core::int #t16 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2.==(null) ?{core::int} self::_#Extension|lateExtensionField2 = #t16 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField2' has been assigned during initialization.") : #t15{core::int};
 static method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
@@ -109,6 +126,7 @@
   self::expect(87, self::Extension|lateExtensionField1);
   self::expect(87, self::Extension|lateExtensionField1Init);
   self::Extension|staticMethod();
+  self::expect(2, new self::C::•(1).{self::C::y});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!expected.{core::Object::==}(actual))
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.transformed.expect
index 850426a..e1e5f51 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.transformed.expect
@@ -3,6 +3,23 @@
 import "dart:core" as core;
 import "dart:_internal" as _in;
 
+class B extends core::Object {
+  final field core::int x;
+  constructor •(core::int x) → self::B
+    : self::B::x = x, super core::Object::•()
+    ;
+}
+class C extends self::B {
+  field core::int? _#C#y = null;
+  field core::bool _#C#y#isSet = false;
+  constructor •(core::int x) → self::C
+    : super self::B::•(x)
+    ;
+  get y() → core::int
+    return let final core::int? #t1 = this.{self::C::_#C#y} in #t1.==(null) ?{core::int} let final core::int #t2 = this.{self::B::x}.{core::num::+}(1) in this.{self::C::_#C#y}.==(null) ?{core::int} this.{self::C::_#C#y} = #t2 : throw new _in::LateInitializationErrorImpl::•("Field 'y' has been assigned during initialization.") : #t1{core::int};
+  method method() → dynamic
+    return this.{self::B::x};
+}
 class Class<T extends core::Object? = dynamic> extends core::Object {
   static field core::int? lateStaticField1Init = null;
   static field core::int? _#lateStaticField1 = null;
@@ -21,12 +38,12 @@
     return self::Class::lateStaticField1Init = value;
   }
   static get lateStaticField1() → core::int
-    return let final core::int? #t1 = self::Class::_#lateStaticField1 in #t1.==(null) ?{core::int} let final core::int #t2 = self::Class::initLateStaticField1(87) in self::Class::_#lateStaticField1.==(null) ?{core::int} self::Class::_#lateStaticField1 = #t2 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField1' has been assigned during initialization.") : #t1{core::int};
+    return let final core::int? #t3 = self::Class::_#lateStaticField1 in #t3.==(null) ?{core::int} let final core::int #t4 = self::Class::initLateStaticField1(87) in self::Class::_#lateStaticField1.==(null) ?{core::int} self::Class::_#lateStaticField1 = #t4 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField1' has been assigned during initialization.") : #t3{core::int};
   static method initLateStaticField2(core::int value) → core::int {
     return self::Class::lateStaticField2Init = value;
   }
   static get lateStaticField2() → core::int
-    return let final core::int? #t3 = self::Class::_#lateStaticField2 in #t3.==(null) ?{core::int} let final core::int #t4 = self::Class::initLateStaticField2(42) in self::Class::_#lateStaticField2.==(null) ?{core::int} self::Class::_#lateStaticField2 = #t4 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField2' has been assigned during initialization.") : #t3{core::int};
+    return let final core::int? #t5 = self::Class::_#lateStaticField2 in #t5.==(null) ?{core::int} let final core::int #t6 = self::Class::initLateStaticField2(42) in self::Class::_#lateStaticField2.==(null) ?{core::int} self::Class::_#lateStaticField2 = #t6 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField2' has been assigned during initialization.") : #t5{core::int};
   static method staticMethod() → dynamic {
     self::expect(null, self::Class::lateStaticField2Init);
     self::expect(42, self::Class::lateStaticField2);
@@ -36,19 +53,19 @@
     return this.{self::Class::lateInstanceFieldInit} = value;
   }
   get lateInstanceField() → core::int
-    return let final core::int? #t5 = this.{self::Class::_#Class#lateInstanceField} in #t5.==(null) ?{core::int} let final core::int #t6 = this.{self::Class::initLateInstanceField}(16) in this.{self::Class::_#Class#lateInstanceField}.==(null) ?{core::int} this.{self::Class::_#Class#lateInstanceField} = #t6 : throw new _in::LateInitializationErrorImpl::•("Field 'lateInstanceField' has been assigned during initialization.") : #t5{core::int};
+    return let final core::int? #t7 = this.{self::Class::_#Class#lateInstanceField} in #t7.==(null) ?{core::int} let final core::int #t8 = this.{self::Class::initLateInstanceField}(16) in this.{self::Class::_#Class#lateInstanceField}.==(null) ?{core::int} this.{self::Class::_#Class#lateInstanceField} = #t8 : throw new _in::LateInitializationErrorImpl::•("Field 'lateInstanceField' has been assigned during initialization.") : #t7{core::int};
   method initLateGenericField(generic-covariant-impl self::Class::T% value) → self::Class::T% {
     return this.{self::Class::lateGenericFieldInit} = value;
   }
   get lateGenericField() → self::Class::T% {
     if(!this.{self::Class::_#Class#lateGenericField#isSet}) {
-      final self::Class::T% #t7 = this.{self::Class::initLateGenericField}(this.{self::Class::field});
+      final self::Class::T% #t9 = this.{self::Class::initLateGenericField}(this.{self::Class::field});
       if(this.{self::Class::_#Class#lateGenericField#isSet})
         throw new _in::LateInitializationErrorImpl::•("Field 'lateGenericField' has been assigned during initialization.");
-      this.{self::Class::_#Class#lateGenericField} = #t7;
+      this.{self::Class::_#Class#lateGenericField} = #t9;
       this.{self::Class::_#Class#lateGenericField#isSet} = true;
     }
-    return let final self::Class::T? #t8 = this.{self::Class::_#Class#lateGenericField} in #t8{self::Class::T%};
+    return let final self::Class::T? #t10 = this.{self::Class::_#Class#lateGenericField} in #t10{self::Class::T%};
   }
   method instanceMethod() → dynamic {
     self::expect(null, this.{self::Class::lateInstanceFieldInit});
@@ -80,17 +97,17 @@
   return self::lateTopLevelField1Init = value;
 }
 static get lateTopLevelField1() → core::int
-  return let final core::int? #t9 = self::_#lateTopLevelField1 in #t9.==(null) ?{core::int} let final core::int #t10 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1.==(null) ?{core::int} self::_#lateTopLevelField1 = #t10 : throw new _in::LateInitializationErrorImpl::•("Field 'lateTopLevelField1' has been assigned during initialization.") : #t9{core::int};
+  return let final core::int? #t11 = self::_#lateTopLevelField1 in #t11.==(null) ?{core::int} let final core::int #t12 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1.==(null) ?{core::int} self::_#lateTopLevelField1 = #t12 : throw new _in::LateInitializationErrorImpl::•("Field 'lateTopLevelField1' has been assigned during initialization.") : #t11{core::int};
 static method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
 static get Extension|lateExtensionField1() → core::int
-  return let final core::int? #t11 = self::_#Extension|lateExtensionField1 in #t11.==(null) ?{core::int} let final core::int #t12 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1.==(null) ?{core::int} self::_#Extension|lateExtensionField1 = #t12 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField1' has been assigned during initialization.") : #t11{core::int};
+  return let final core::int? #t13 = self::_#Extension|lateExtensionField1 in #t13.==(null) ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1.==(null) ?{core::int} self::_#Extension|lateExtensionField1 = #t14 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField1' has been assigned during initialization.") : #t13{core::int};
 static method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
 static get Extension|lateExtensionField2() → core::int
-  return let final core::int? #t13 = self::_#Extension|lateExtensionField2 in #t13.==(null) ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2.==(null) ?{core::int} self::_#Extension|lateExtensionField2 = #t14 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField2' has been assigned during initialization.") : #t13{core::int};
+  return let final core::int? #t15 = self::_#Extension|lateExtensionField2 in #t15.==(null) ?{core::int} let final core::int #t16 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2.==(null) ?{core::int} self::_#Extension|lateExtensionField2 = #t16 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField2' has been assigned during initialization.") : #t15{core::int};
 static method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
@@ -109,6 +126,7 @@
   self::expect(87, self::Extension|lateExtensionField1);
   self::expect(87, self::Extension|lateExtensionField1Init);
   self::Extension|staticMethod();
+  self::expect(2, new self::C::•(1).{self::C::y});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!expected.{core::Object::==}(actual))
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.textual_outline.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.textual_outline.expect
index 820ddd2..09efd13 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.textual_outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.textual_outline.expect
@@ -1,3 +1,13 @@
+class B {
+  final int x;
+  B(this.x);
+}
+class C extends B {
+  late ;
+  final y = x + 1;
+  C(int x) : super(x);
+  method() => x;
+}
 int? lateTopLevelField1Init;
 int initLateTopLevelField1(int value) {}
 late ;
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.expect
index 850426a..e1e5f51 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.expect
@@ -3,6 +3,23 @@
 import "dart:core" as core;
 import "dart:_internal" as _in;
 
+class B extends core::Object {
+  final field core::int x;
+  constructor •(core::int x) → self::B
+    : self::B::x = x, super core::Object::•()
+    ;
+}
+class C extends self::B {
+  field core::int? _#C#y = null;
+  field core::bool _#C#y#isSet = false;
+  constructor •(core::int x) → self::C
+    : super self::B::•(x)
+    ;
+  get y() → core::int
+    return let final core::int? #t1 = this.{self::C::_#C#y} in #t1.==(null) ?{core::int} let final core::int #t2 = this.{self::B::x}.{core::num::+}(1) in this.{self::C::_#C#y}.==(null) ?{core::int} this.{self::C::_#C#y} = #t2 : throw new _in::LateInitializationErrorImpl::•("Field 'y' has been assigned during initialization.") : #t1{core::int};
+  method method() → dynamic
+    return this.{self::B::x};
+}
 class Class<T extends core::Object? = dynamic> extends core::Object {
   static field core::int? lateStaticField1Init = null;
   static field core::int? _#lateStaticField1 = null;
@@ -21,12 +38,12 @@
     return self::Class::lateStaticField1Init = value;
   }
   static get lateStaticField1() → core::int
-    return let final core::int? #t1 = self::Class::_#lateStaticField1 in #t1.==(null) ?{core::int} let final core::int #t2 = self::Class::initLateStaticField1(87) in self::Class::_#lateStaticField1.==(null) ?{core::int} self::Class::_#lateStaticField1 = #t2 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField1' has been assigned during initialization.") : #t1{core::int};
+    return let final core::int? #t3 = self::Class::_#lateStaticField1 in #t3.==(null) ?{core::int} let final core::int #t4 = self::Class::initLateStaticField1(87) in self::Class::_#lateStaticField1.==(null) ?{core::int} self::Class::_#lateStaticField1 = #t4 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField1' has been assigned during initialization.") : #t3{core::int};
   static method initLateStaticField2(core::int value) → core::int {
     return self::Class::lateStaticField2Init = value;
   }
   static get lateStaticField2() → core::int
-    return let final core::int? #t3 = self::Class::_#lateStaticField2 in #t3.==(null) ?{core::int} let final core::int #t4 = self::Class::initLateStaticField2(42) in self::Class::_#lateStaticField2.==(null) ?{core::int} self::Class::_#lateStaticField2 = #t4 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField2' has been assigned during initialization.") : #t3{core::int};
+    return let final core::int? #t5 = self::Class::_#lateStaticField2 in #t5.==(null) ?{core::int} let final core::int #t6 = self::Class::initLateStaticField2(42) in self::Class::_#lateStaticField2.==(null) ?{core::int} self::Class::_#lateStaticField2 = #t6 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField2' has been assigned during initialization.") : #t5{core::int};
   static method staticMethod() → dynamic {
     self::expect(null, self::Class::lateStaticField2Init);
     self::expect(42, self::Class::lateStaticField2);
@@ -36,19 +53,19 @@
     return this.{self::Class::lateInstanceFieldInit} = value;
   }
   get lateInstanceField() → core::int
-    return let final core::int? #t5 = this.{self::Class::_#Class#lateInstanceField} in #t5.==(null) ?{core::int} let final core::int #t6 = this.{self::Class::initLateInstanceField}(16) in this.{self::Class::_#Class#lateInstanceField}.==(null) ?{core::int} this.{self::Class::_#Class#lateInstanceField} = #t6 : throw new _in::LateInitializationErrorImpl::•("Field 'lateInstanceField' has been assigned during initialization.") : #t5{core::int};
+    return let final core::int? #t7 = this.{self::Class::_#Class#lateInstanceField} in #t7.==(null) ?{core::int} let final core::int #t8 = this.{self::Class::initLateInstanceField}(16) in this.{self::Class::_#Class#lateInstanceField}.==(null) ?{core::int} this.{self::Class::_#Class#lateInstanceField} = #t8 : throw new _in::LateInitializationErrorImpl::•("Field 'lateInstanceField' has been assigned during initialization.") : #t7{core::int};
   method initLateGenericField(generic-covariant-impl self::Class::T% value) → self::Class::T% {
     return this.{self::Class::lateGenericFieldInit} = value;
   }
   get lateGenericField() → self::Class::T% {
     if(!this.{self::Class::_#Class#lateGenericField#isSet}) {
-      final self::Class::T% #t7 = this.{self::Class::initLateGenericField}(this.{self::Class::field});
+      final self::Class::T% #t9 = this.{self::Class::initLateGenericField}(this.{self::Class::field});
       if(this.{self::Class::_#Class#lateGenericField#isSet})
         throw new _in::LateInitializationErrorImpl::•("Field 'lateGenericField' has been assigned during initialization.");
-      this.{self::Class::_#Class#lateGenericField} = #t7;
+      this.{self::Class::_#Class#lateGenericField} = #t9;
       this.{self::Class::_#Class#lateGenericField#isSet} = true;
     }
-    return let final self::Class::T? #t8 = this.{self::Class::_#Class#lateGenericField} in #t8{self::Class::T%};
+    return let final self::Class::T? #t10 = this.{self::Class::_#Class#lateGenericField} in #t10{self::Class::T%};
   }
   method instanceMethod() → dynamic {
     self::expect(null, this.{self::Class::lateInstanceFieldInit});
@@ -80,17 +97,17 @@
   return self::lateTopLevelField1Init = value;
 }
 static get lateTopLevelField1() → core::int
-  return let final core::int? #t9 = self::_#lateTopLevelField1 in #t9.==(null) ?{core::int} let final core::int #t10 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1.==(null) ?{core::int} self::_#lateTopLevelField1 = #t10 : throw new _in::LateInitializationErrorImpl::•("Field 'lateTopLevelField1' has been assigned during initialization.") : #t9{core::int};
+  return let final core::int? #t11 = self::_#lateTopLevelField1 in #t11.==(null) ?{core::int} let final core::int #t12 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1.==(null) ?{core::int} self::_#lateTopLevelField1 = #t12 : throw new _in::LateInitializationErrorImpl::•("Field 'lateTopLevelField1' has been assigned during initialization.") : #t11{core::int};
 static method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
 static get Extension|lateExtensionField1() → core::int
-  return let final core::int? #t11 = self::_#Extension|lateExtensionField1 in #t11.==(null) ?{core::int} let final core::int #t12 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1.==(null) ?{core::int} self::_#Extension|lateExtensionField1 = #t12 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField1' has been assigned during initialization.") : #t11{core::int};
+  return let final core::int? #t13 = self::_#Extension|lateExtensionField1 in #t13.==(null) ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1.==(null) ?{core::int} self::_#Extension|lateExtensionField1 = #t14 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField1' has been assigned during initialization.") : #t13{core::int};
 static method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
 static get Extension|lateExtensionField2() → core::int
-  return let final core::int? #t13 = self::_#Extension|lateExtensionField2 in #t13.==(null) ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2.==(null) ?{core::int} self::_#Extension|lateExtensionField2 = #t14 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField2' has been assigned during initialization.") : #t13{core::int};
+  return let final core::int? #t15 = self::_#Extension|lateExtensionField2 in #t15.==(null) ?{core::int} let final core::int #t16 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2.==(null) ?{core::int} self::_#Extension|lateExtensionField2 = #t16 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField2' has been assigned during initialization.") : #t15{core::int};
 static method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
@@ -109,6 +126,7 @@
   self::expect(87, self::Extension|lateExtensionField1);
   self::expect(87, self::Extension|lateExtensionField1Init);
   self::Extension|staticMethod();
+  self::expect(2, new self::C::•(1).{self::C::y});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!expected.{core::Object::==}(actual))
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.transformed.expect
index 850426a..e1e5f51 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.transformed.expect
@@ -3,6 +3,23 @@
 import "dart:core" as core;
 import "dart:_internal" as _in;
 
+class B extends core::Object {
+  final field core::int x;
+  constructor •(core::int x) → self::B
+    : self::B::x = x, super core::Object::•()
+    ;
+}
+class C extends self::B {
+  field core::int? _#C#y = null;
+  field core::bool _#C#y#isSet = false;
+  constructor •(core::int x) → self::C
+    : super self::B::•(x)
+    ;
+  get y() → core::int
+    return let final core::int? #t1 = this.{self::C::_#C#y} in #t1.==(null) ?{core::int} let final core::int #t2 = this.{self::B::x}.{core::num::+}(1) in this.{self::C::_#C#y}.==(null) ?{core::int} this.{self::C::_#C#y} = #t2 : throw new _in::LateInitializationErrorImpl::•("Field 'y' has been assigned during initialization.") : #t1{core::int};
+  method method() → dynamic
+    return this.{self::B::x};
+}
 class Class<T extends core::Object? = dynamic> extends core::Object {
   static field core::int? lateStaticField1Init = null;
   static field core::int? _#lateStaticField1 = null;
@@ -21,12 +38,12 @@
     return self::Class::lateStaticField1Init = value;
   }
   static get lateStaticField1() → core::int
-    return let final core::int? #t1 = self::Class::_#lateStaticField1 in #t1.==(null) ?{core::int} let final core::int #t2 = self::Class::initLateStaticField1(87) in self::Class::_#lateStaticField1.==(null) ?{core::int} self::Class::_#lateStaticField1 = #t2 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField1' has been assigned during initialization.") : #t1{core::int};
+    return let final core::int? #t3 = self::Class::_#lateStaticField1 in #t3.==(null) ?{core::int} let final core::int #t4 = self::Class::initLateStaticField1(87) in self::Class::_#lateStaticField1.==(null) ?{core::int} self::Class::_#lateStaticField1 = #t4 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField1' has been assigned during initialization.") : #t3{core::int};
   static method initLateStaticField2(core::int value) → core::int {
     return self::Class::lateStaticField2Init = value;
   }
   static get lateStaticField2() → core::int
-    return let final core::int? #t3 = self::Class::_#lateStaticField2 in #t3.==(null) ?{core::int} let final core::int #t4 = self::Class::initLateStaticField2(42) in self::Class::_#lateStaticField2.==(null) ?{core::int} self::Class::_#lateStaticField2 = #t4 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField2' has been assigned during initialization.") : #t3{core::int};
+    return let final core::int? #t5 = self::Class::_#lateStaticField2 in #t5.==(null) ?{core::int} let final core::int #t6 = self::Class::initLateStaticField2(42) in self::Class::_#lateStaticField2.==(null) ?{core::int} self::Class::_#lateStaticField2 = #t6 : throw new _in::LateInitializationErrorImpl::•("Field 'lateStaticField2' has been assigned during initialization.") : #t5{core::int};
   static method staticMethod() → dynamic {
     self::expect(null, self::Class::lateStaticField2Init);
     self::expect(42, self::Class::lateStaticField2);
@@ -36,19 +53,19 @@
     return this.{self::Class::lateInstanceFieldInit} = value;
   }
   get lateInstanceField() → core::int
-    return let final core::int? #t5 = this.{self::Class::_#Class#lateInstanceField} in #t5.==(null) ?{core::int} let final core::int #t6 = this.{self::Class::initLateInstanceField}(16) in this.{self::Class::_#Class#lateInstanceField}.==(null) ?{core::int} this.{self::Class::_#Class#lateInstanceField} = #t6 : throw new _in::LateInitializationErrorImpl::•("Field 'lateInstanceField' has been assigned during initialization.") : #t5{core::int};
+    return let final core::int? #t7 = this.{self::Class::_#Class#lateInstanceField} in #t7.==(null) ?{core::int} let final core::int #t8 = this.{self::Class::initLateInstanceField}(16) in this.{self::Class::_#Class#lateInstanceField}.==(null) ?{core::int} this.{self::Class::_#Class#lateInstanceField} = #t8 : throw new _in::LateInitializationErrorImpl::•("Field 'lateInstanceField' has been assigned during initialization.") : #t7{core::int};
   method initLateGenericField(generic-covariant-impl self::Class::T% value) → self::Class::T% {
     return this.{self::Class::lateGenericFieldInit} = value;
   }
   get lateGenericField() → self::Class::T% {
     if(!this.{self::Class::_#Class#lateGenericField#isSet}) {
-      final self::Class::T% #t7 = this.{self::Class::initLateGenericField}(this.{self::Class::field});
+      final self::Class::T% #t9 = this.{self::Class::initLateGenericField}(this.{self::Class::field});
       if(this.{self::Class::_#Class#lateGenericField#isSet})
         throw new _in::LateInitializationErrorImpl::•("Field 'lateGenericField' has been assigned during initialization.");
-      this.{self::Class::_#Class#lateGenericField} = #t7;
+      this.{self::Class::_#Class#lateGenericField} = #t9;
       this.{self::Class::_#Class#lateGenericField#isSet} = true;
     }
-    return let final self::Class::T? #t8 = this.{self::Class::_#Class#lateGenericField} in #t8{self::Class::T%};
+    return let final self::Class::T? #t10 = this.{self::Class::_#Class#lateGenericField} in #t10{self::Class::T%};
   }
   method instanceMethod() → dynamic {
     self::expect(null, this.{self::Class::lateInstanceFieldInit});
@@ -80,17 +97,17 @@
   return self::lateTopLevelField1Init = value;
 }
 static get lateTopLevelField1() → core::int
-  return let final core::int? #t9 = self::_#lateTopLevelField1 in #t9.==(null) ?{core::int} let final core::int #t10 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1.==(null) ?{core::int} self::_#lateTopLevelField1 = #t10 : throw new _in::LateInitializationErrorImpl::•("Field 'lateTopLevelField1' has been assigned during initialization.") : #t9{core::int};
+  return let final core::int? #t11 = self::_#lateTopLevelField1 in #t11.==(null) ?{core::int} let final core::int #t12 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1.==(null) ?{core::int} self::_#lateTopLevelField1 = #t12 : throw new _in::LateInitializationErrorImpl::•("Field 'lateTopLevelField1' has been assigned during initialization.") : #t11{core::int};
 static method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
 static get Extension|lateExtensionField1() → core::int
-  return let final core::int? #t11 = self::_#Extension|lateExtensionField1 in #t11.==(null) ?{core::int} let final core::int #t12 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1.==(null) ?{core::int} self::_#Extension|lateExtensionField1 = #t12 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField1' has been assigned during initialization.") : #t11{core::int};
+  return let final core::int? #t13 = self::_#Extension|lateExtensionField1 in #t13.==(null) ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1.==(null) ?{core::int} self::_#Extension|lateExtensionField1 = #t14 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField1' has been assigned during initialization.") : #t13{core::int};
 static method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
 static get Extension|lateExtensionField2() → core::int
-  return let final core::int? #t13 = self::_#Extension|lateExtensionField2 in #t13.==(null) ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2.==(null) ?{core::int} self::_#Extension|lateExtensionField2 = #t14 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField2' has been assigned during initialization.") : #t13{core::int};
+  return let final core::int? #t15 = self::_#Extension|lateExtensionField2 in #t15.==(null) ?{core::int} let final core::int #t16 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2.==(null) ?{core::int} self::_#Extension|lateExtensionField2 = #t16 : throw new _in::LateInitializationErrorImpl::•("Field 'lateExtensionField2' has been assigned during initialization.") : #t15{core::int};
 static method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
@@ -109,6 +126,7 @@
   self::expect(87, self::Extension|lateExtensionField1);
   self::expect(87, self::Extension|lateExtensionField1Init);
   self::Extension|staticMethod();
+  self::expect(2, new self::C::•(1).{self::C::y});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!expected.{core::Object::==}(actual))
diff --git a/pkg/front_end/testcases/nnbd/flutter_issue64155.dart b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart
new file mode 100644
index 0000000..6274977
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart
@@ -0,0 +1,53 @@
+// Copyright (c) 2020, 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.
+
+mixin TestMixin<R, T> {
+  Future<T> test(Future<R> fetch) async {
+    final response = await fetch;
+    T result;
+    if (response is Response) {
+      result = response.data;
+    } else if (response is PagingResponse) {
+      result = response.data.data as T;
+    } else if (response is T) {
+      result = response;
+    } else {
+      throw Exception('Invalid response type');
+    }
+    return result;
+  }
+}
+
+class PagingResponse<T> {
+  final PagingResponseData<T> data;
+
+  PagingResponse(this.data);
+}
+
+class PagingResponseData<T> {
+  final List<T> data;
+
+  PagingResponseData(this.data);
+}
+
+class Response<T> {
+  final T data;
+  Response(this.data);
+}
+
+class Class1 with TestMixin<Response<String>, String> {
+  _test() {
+    final response = Response<String>('test');
+    test(Future.value(response));
+  }
+}
+
+class Class2 with TestMixin<PagingResponse<String>, String> {
+  _test() {
+    final response = PagingResponse<String>(PagingResponseData(['test']));
+    test(Future.value(response));
+  }
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.outline.expect b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.outline.expect
new file mode 100644
index 0000000..6bd460cb
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.outline.expect
@@ -0,0 +1,48 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+import "dart:async" as asy;
+
+abstract class TestMixin<R extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
+  method test(generic-covariant-impl asy::Future<self::TestMixin::R%> fetch) → asy::Future<self::TestMixin::T%> async 
+    ;
+}
+class PagingResponse<T extends core::Object? = dynamic> extends core::Object {
+  final field self::PagingResponseData<self::PagingResponse::T%> data;
+  constructor •(self::PagingResponseData<self::PagingResponse::T%> data) → self::PagingResponse<self::PagingResponse::T%>
+    ;
+}
+class PagingResponseData<T extends core::Object? = dynamic> extends core::Object {
+  final field core::List<self::PagingResponseData::T%> data;
+  constructor •(core::List<self::PagingResponseData::T%> data) → self::PagingResponseData<self::PagingResponseData::T%>
+    ;
+}
+class Response<T extends core::Object? = dynamic> extends core::Object {
+  final field self::Response::T% data;
+  constructor •(self::Response::T% data) → self::Response<self::Response::T%>
+    ;
+}
+abstract class _Class1&Object&TestMixin = core::Object with self::TestMixin<self::Response<core::String>, core::String> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class1&Object&TestMixin
+    : super core::Object::•()
+    ;
+}
+class Class1 extends self::_Class1&Object&TestMixin {
+  synthetic constructor •() → self::Class1
+    ;
+  method _test() → dynamic
+    ;
+}
+abstract class _Class2&Object&TestMixin = core::Object with self::TestMixin<self::PagingResponse<core::String>, core::String> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class2&Object&TestMixin
+    : super core::Object::•()
+    ;
+}
+class Class2 extends self::_Class2&Object&TestMixin {
+  synthetic constructor •() → self::Class2
+    ;
+  method _test() → dynamic
+    ;
+}
+static method main() → dynamic
+  ;
diff --git a/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.strong.expect b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.strong.expect
new file mode 100644
index 0000000..9854241
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.strong.expect
@@ -0,0 +1,73 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+import "dart:async" as asy;
+
+abstract class TestMixin<R extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
+  method test(generic-covariant-impl asy::Future<self::TestMixin::R%> fetch) → asy::Future<self::TestMixin::T%> async {
+    final self::TestMixin::R% response = await fetch;
+    self::TestMixin::T% result;
+    if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
+      result = response{self::TestMixin::R% & self::Response<dynamic> /* '%' & '!' = '!' */}.{self::Response::data} as{TypeError,ForDynamic,ForNonNullableByDefault} self::TestMixin::T%;
+    }
+    else
+      if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
+        result = response{self::TestMixin::R% & self::PagingResponse<dynamic> /* '%' & '!' = '!' */}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} self::TestMixin::T%;
+      }
+      else
+        if(response is{ForNonNullableByDefault} self::TestMixin::T%) {
+          result = response{self::TestMixin::R% & self::TestMixin::T% /* '%' & '%' = '%' */};
+        }
+        else {
+          throw core::Exception::•("Invalid response type");
+        }
+    return result;
+  }
+}
+class PagingResponse<T extends core::Object? = dynamic> extends core::Object {
+  final field self::PagingResponseData<self::PagingResponse::T%> data;
+  constructor •(self::PagingResponseData<self::PagingResponse::T%> data) → self::PagingResponse<self::PagingResponse::T%>
+    : self::PagingResponse::data = data, super core::Object::•()
+    ;
+}
+class PagingResponseData<T extends core::Object? = dynamic> extends core::Object {
+  final field core::List<self::PagingResponseData::T%> data;
+  constructor •(core::List<self::PagingResponseData::T%> data) → self::PagingResponseData<self::PagingResponseData::T%>
+    : self::PagingResponseData::data = data, super core::Object::•()
+    ;
+}
+class Response<T extends core::Object? = dynamic> extends core::Object {
+  final field self::Response::T% data;
+  constructor •(self::Response::T% data) → self::Response<self::Response::T%>
+    : self::Response::data = data, super core::Object::•()
+    ;
+}
+abstract class _Class1&Object&TestMixin = core::Object with self::TestMixin<self::Response<core::String>, core::String> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class1&Object&TestMixin
+    : super core::Object::•()
+    ;
+}
+class Class1 extends self::_Class1&Object&TestMixin {
+  synthetic constructor •() → self::Class1
+    : super self::_Class1&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::Response<core::String> response = new self::Response::•<core::String>("test");
+    this.{self::TestMixin::test}(asy::Future::value<self::Response<core::String>>(response));
+  }
+}
+abstract class _Class2&Object&TestMixin = core::Object with self::TestMixin<self::PagingResponse<core::String>, core::String> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class2&Object&TestMixin
+    : super core::Object::•()
+    ;
+}
+class Class2 extends self::_Class2&Object&TestMixin {
+  synthetic constructor •() → self::Class2
+    : super self::_Class2&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::PagingResponse<core::String> response = new self::PagingResponse::•<core::String>(new self::PagingResponseData::•<core::String>(<core::String>["test"]));
+    this.{self::TestMixin::test}(asy::Future::value<self::PagingResponse<core::String>>(response));
+  }
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.strong.transformed.expect
new file mode 100644
index 0000000..a06a87e
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.strong.transformed.expect
@@ -0,0 +1,190 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+import "dart:async" as asy;
+import "dart:_internal" as _in;
+
+abstract class TestMixin<R extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
+  method test(generic-covariant-impl asy::Future<self::TestMixin::R%> fetch) → asy::Future<self::TestMixin::T%> /* originally async */ {
+    final asy::_AsyncAwaitCompleter<self::TestMixin::T%> :async_completer = new asy::_AsyncAwaitCompleter::•<self::TestMixin::T%>();
+    FutureOr<self::TestMixin::T%>? :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) → dynamic :async_op_then;
+    (core::Object, core::StackTrace) → dynamic :async_op_error;
+    core::int :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L1:
+        {
+          [yield] let dynamic #t1 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::TestMixin::R% response = _in::unsafeCast<self::TestMixin::R%>(:result);
+          self::TestMixin::T% result;
+          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
+            result = response{self::TestMixin::R% & self::Response<dynamic> /* '%' & '!' = '!' */}.{self::Response::data} as{TypeError,ForDynamic,ForNonNullableByDefault} self::TestMixin::T%;
+          }
+          else
+            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
+              result = response{self::TestMixin::R% & self::PagingResponse<dynamic> /* '%' & '!' = '!' */}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} self::TestMixin::T%;
+            }
+            else
+              if(response is{ForNonNullableByDefault} self::TestMixin::T%) {
+                result = response{self::TestMixin::R% & self::TestMixin::T% /* '%' & '%' = '%' */};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L1;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+}
+class PagingResponse<T extends core::Object? = dynamic> extends core::Object {
+  final field self::PagingResponseData<self::PagingResponse::T%> data;
+  constructor •(self::PagingResponseData<self::PagingResponse::T%> data) → self::PagingResponse<self::PagingResponse::T%>
+    : self::PagingResponse::data = data, super core::Object::•()
+    ;
+}
+class PagingResponseData<T extends core::Object? = dynamic> extends core::Object {
+  final field core::List<self::PagingResponseData::T%> data;
+  constructor •(core::List<self::PagingResponseData::T%> data) → self::PagingResponseData<self::PagingResponseData::T%>
+    : self::PagingResponseData::data = data, super core::Object::•()
+    ;
+}
+class Response<T extends core::Object? = dynamic> extends core::Object {
+  final field self::Response::T% data;
+  constructor •(self::Response::T% data) → self::Response<self::Response::T%>
+    : self::Response::data = data, super core::Object::•()
+    ;
+}
+abstract class _Class1&Object&TestMixin extends core::Object implements self::TestMixin<self::Response<core::String>, core::String> /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class1&Object&TestMixin
+    : super core::Object::•()
+    ;
+  method test(generic-covariant-impl asy::Future<self::Response<core::String>> fetch) → asy::Future<core::String> /* originally async */ {
+    final asy::_AsyncAwaitCompleter<core::String> :async_completer = new asy::_AsyncAwaitCompleter::•<core::String>();
+    FutureOr<core::String>? :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) → dynamic :async_op_then;
+    (core::Object, core::StackTrace) → dynamic :async_op_error;
+    core::int :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L2:
+        {
+          [yield] let dynamic #t2 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::Response<core::String> response = _in::unsafeCast<self::Response<core::String>>(:result);
+          core::String result;
+          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
+            result = response{self::Response<core::String>}.{self::Response::data};
+          }
+          else
+            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
+              result = response{self::Response<core::String>}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} core::String;
+            }
+            else
+              if(response is{ForNonNullableByDefault} core::String) {
+                result = response{self::Response<core::String>};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L2;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+}
+class Class1 extends self::_Class1&Object&TestMixin {
+  synthetic constructor •() → self::Class1
+    : super self::_Class1&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::Response<core::String> response = new self::Response::•<core::String>("test");
+    this.{self::TestMixin::test}(asy::Future::value<self::Response<core::String>>(response));
+  }
+}
+abstract class _Class2&Object&TestMixin extends core::Object implements self::TestMixin<self::PagingResponse<core::String>, core::String> /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class2&Object&TestMixin
+    : super core::Object::•()
+    ;
+  method test(generic-covariant-impl asy::Future<self::PagingResponse<core::String>> fetch) → asy::Future<core::String> /* originally async */ {
+    final asy::_AsyncAwaitCompleter<core::String> :async_completer = new asy::_AsyncAwaitCompleter::•<core::String>();
+    FutureOr<core::String>? :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) → dynamic :async_op_then;
+    (core::Object, core::StackTrace) → dynamic :async_op_error;
+    core::int :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L3:
+        {
+          [yield] let dynamic #t3 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::PagingResponse<core::String> response = _in::unsafeCast<self::PagingResponse<core::String>>(:result);
+          core::String result;
+          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
+            result = response{self::PagingResponse<core::String>}.{self::Response::data} as{TypeError,ForDynamic,ForNonNullableByDefault} core::String;
+          }
+          else
+            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
+              result = response{self::PagingResponse<core::String>}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} core::String;
+            }
+            else
+              if(response is{ForNonNullableByDefault} core::String) {
+                result = response{self::PagingResponse<core::String>};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L3;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+}
+class Class2 extends self::_Class2&Object&TestMixin {
+  synthetic constructor •() → self::Class2
+    : super self::_Class2&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::PagingResponse<core::String> response = new self::PagingResponse::•<core::String>(new self::PagingResponseData::•<core::String>(<core::String>["test"]));
+    this.{self::TestMixin::test}(asy::Future::value<self::PagingResponse<core::String>>(response));
+  }
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.textual_outline.expect b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.textual_outline.expect
new file mode 100644
index 0000000..0688f3b
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.textual_outline.expect
@@ -0,0 +1,28 @@
+mixin TestMixin<R, T> {
+  Future<T> test(Future<R> fetch) async {}
+}
+
+class PagingResponse<T> {
+  final PagingResponseData<T> data;
+  PagingResponse(this.data);
+}
+
+class PagingResponseData<T> {
+  final List<T> data;
+  PagingResponseData(this.data);
+}
+
+class Response<T> {
+  final T data;
+  Response(this.data);
+}
+
+class Class1 with TestMixin<Response<String>, String> {
+  _test() {}
+}
+
+class Class2 with TestMixin<PagingResponse<String>, String> {
+  _test() {}
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.textual_outline_modelled.expect b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.textual_outline_modelled.expect
new file mode 100644
index 0000000..1440e80
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.textual_outline_modelled.expect
@@ -0,0 +1,27 @@
+class Class1 with TestMixin<Response<String>, String> {
+  _test() {}
+}
+
+class Class2 with TestMixin<PagingResponse<String>, String> {
+  _test() {}
+}
+
+class PagingResponse<T> {
+  PagingResponse(this.data);
+  final PagingResponseData<T> data;
+}
+
+class PagingResponseData<T> {
+  PagingResponseData(this.data);
+  final List<T> data;
+}
+
+class Response<T> {
+  Response(this.data);
+  final T data;
+}
+
+main() {}
+mixin TestMixin<R, T> {
+  Future<T> test(Future<R> fetch) async {}
+}
diff --git a/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.weak.expect b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.weak.expect
new file mode 100644
index 0000000..9854241
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.weak.expect
@@ -0,0 +1,73 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+import "dart:async" as asy;
+
+abstract class TestMixin<R extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
+  method test(generic-covariant-impl asy::Future<self::TestMixin::R%> fetch) → asy::Future<self::TestMixin::T%> async {
+    final self::TestMixin::R% response = await fetch;
+    self::TestMixin::T% result;
+    if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
+      result = response{self::TestMixin::R% & self::Response<dynamic> /* '%' & '!' = '!' */}.{self::Response::data} as{TypeError,ForDynamic,ForNonNullableByDefault} self::TestMixin::T%;
+    }
+    else
+      if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
+        result = response{self::TestMixin::R% & self::PagingResponse<dynamic> /* '%' & '!' = '!' */}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} self::TestMixin::T%;
+      }
+      else
+        if(response is{ForNonNullableByDefault} self::TestMixin::T%) {
+          result = response{self::TestMixin::R% & self::TestMixin::T% /* '%' & '%' = '%' */};
+        }
+        else {
+          throw core::Exception::•("Invalid response type");
+        }
+    return result;
+  }
+}
+class PagingResponse<T extends core::Object? = dynamic> extends core::Object {
+  final field self::PagingResponseData<self::PagingResponse::T%> data;
+  constructor •(self::PagingResponseData<self::PagingResponse::T%> data) → self::PagingResponse<self::PagingResponse::T%>
+    : self::PagingResponse::data = data, super core::Object::•()
+    ;
+}
+class PagingResponseData<T extends core::Object? = dynamic> extends core::Object {
+  final field core::List<self::PagingResponseData::T%> data;
+  constructor •(core::List<self::PagingResponseData::T%> data) → self::PagingResponseData<self::PagingResponseData::T%>
+    : self::PagingResponseData::data = data, super core::Object::•()
+    ;
+}
+class Response<T extends core::Object? = dynamic> extends core::Object {
+  final field self::Response::T% data;
+  constructor •(self::Response::T% data) → self::Response<self::Response::T%>
+    : self::Response::data = data, super core::Object::•()
+    ;
+}
+abstract class _Class1&Object&TestMixin = core::Object with self::TestMixin<self::Response<core::String>, core::String> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class1&Object&TestMixin
+    : super core::Object::•()
+    ;
+}
+class Class1 extends self::_Class1&Object&TestMixin {
+  synthetic constructor •() → self::Class1
+    : super self::_Class1&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::Response<core::String> response = new self::Response::•<core::String>("test");
+    this.{self::TestMixin::test}(asy::Future::value<self::Response<core::String>>(response));
+  }
+}
+abstract class _Class2&Object&TestMixin = core::Object with self::TestMixin<self::PagingResponse<core::String>, core::String> /*isAnonymousMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class2&Object&TestMixin
+    : super core::Object::•()
+    ;
+}
+class Class2 extends self::_Class2&Object&TestMixin {
+  synthetic constructor •() → self::Class2
+    : super self::_Class2&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::PagingResponse<core::String> response = new self::PagingResponse::•<core::String>(new self::PagingResponseData::•<core::String>(<core::String>["test"]));
+    this.{self::TestMixin::test}(asy::Future::value<self::PagingResponse<core::String>>(response));
+  }
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.weak.transformed.expect
new file mode 100644
index 0000000..a06a87e
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd/flutter_issue64155.dart.weak.transformed.expect
@@ -0,0 +1,190 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+import "dart:async" as asy;
+import "dart:_internal" as _in;
+
+abstract class TestMixin<R extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
+  method test(generic-covariant-impl asy::Future<self::TestMixin::R%> fetch) → asy::Future<self::TestMixin::T%> /* originally async */ {
+    final asy::_AsyncAwaitCompleter<self::TestMixin::T%> :async_completer = new asy::_AsyncAwaitCompleter::•<self::TestMixin::T%>();
+    FutureOr<self::TestMixin::T%>? :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) → dynamic :async_op_then;
+    (core::Object, core::StackTrace) → dynamic :async_op_error;
+    core::int :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L1:
+        {
+          [yield] let dynamic #t1 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::TestMixin::R% response = _in::unsafeCast<self::TestMixin::R%>(:result);
+          self::TestMixin::T% result;
+          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
+            result = response{self::TestMixin::R% & self::Response<dynamic> /* '%' & '!' = '!' */}.{self::Response::data} as{TypeError,ForDynamic,ForNonNullableByDefault} self::TestMixin::T%;
+          }
+          else
+            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
+              result = response{self::TestMixin::R% & self::PagingResponse<dynamic> /* '%' & '!' = '!' */}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} self::TestMixin::T%;
+            }
+            else
+              if(response is{ForNonNullableByDefault} self::TestMixin::T%) {
+                result = response{self::TestMixin::R% & self::TestMixin::T% /* '%' & '%' = '%' */};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L1;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+}
+class PagingResponse<T extends core::Object? = dynamic> extends core::Object {
+  final field self::PagingResponseData<self::PagingResponse::T%> data;
+  constructor •(self::PagingResponseData<self::PagingResponse::T%> data) → self::PagingResponse<self::PagingResponse::T%>
+    : self::PagingResponse::data = data, super core::Object::•()
+    ;
+}
+class PagingResponseData<T extends core::Object? = dynamic> extends core::Object {
+  final field core::List<self::PagingResponseData::T%> data;
+  constructor •(core::List<self::PagingResponseData::T%> data) → self::PagingResponseData<self::PagingResponseData::T%>
+    : self::PagingResponseData::data = data, super core::Object::•()
+    ;
+}
+class Response<T extends core::Object? = dynamic> extends core::Object {
+  final field self::Response::T% data;
+  constructor •(self::Response::T% data) → self::Response<self::Response::T%>
+    : self::Response::data = data, super core::Object::•()
+    ;
+}
+abstract class _Class1&Object&TestMixin extends core::Object implements self::TestMixin<self::Response<core::String>, core::String> /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class1&Object&TestMixin
+    : super core::Object::•()
+    ;
+  method test(generic-covariant-impl asy::Future<self::Response<core::String>> fetch) → asy::Future<core::String> /* originally async */ {
+    final asy::_AsyncAwaitCompleter<core::String> :async_completer = new asy::_AsyncAwaitCompleter::•<core::String>();
+    FutureOr<core::String>? :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) → dynamic :async_op_then;
+    (core::Object, core::StackTrace) → dynamic :async_op_error;
+    core::int :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L2:
+        {
+          [yield] let dynamic #t2 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::Response<core::String> response = _in::unsafeCast<self::Response<core::String>>(:result);
+          core::String result;
+          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
+            result = response{self::Response<core::String>}.{self::Response::data};
+          }
+          else
+            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
+              result = response{self::Response<core::String>}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} core::String;
+            }
+            else
+              if(response is{ForNonNullableByDefault} core::String) {
+                result = response{self::Response<core::String>};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L2;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+}
+class Class1 extends self::_Class1&Object&TestMixin {
+  synthetic constructor •() → self::Class1
+    : super self::_Class1&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::Response<core::String> response = new self::Response::•<core::String>("test");
+    this.{self::TestMixin::test}(asy::Future::value<self::Response<core::String>>(response));
+  }
+}
+abstract class _Class2&Object&TestMixin extends core::Object implements self::TestMixin<self::PagingResponse<core::String>, core::String> /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  {
+  const synthetic constructor •() → self::_Class2&Object&TestMixin
+    : super core::Object::•()
+    ;
+  method test(generic-covariant-impl asy::Future<self::PagingResponse<core::String>> fetch) → asy::Future<core::String> /* originally async */ {
+    final asy::_AsyncAwaitCompleter<core::String> :async_completer = new asy::_AsyncAwaitCompleter::•<core::String>();
+    FutureOr<core::String>? :return_value;
+    dynamic :async_stack_trace;
+    (dynamic) → dynamic :async_op_then;
+    (core::Object, core::StackTrace) → dynamic :async_op_error;
+    core::int :await_jump_var = 0;
+    dynamic :await_ctx_var;
+    dynamic :saved_try_context_var0;
+    function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
+      try {
+        #L3:
+        {
+          [yield] let dynamic #t3 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
+          final self::PagingResponse<core::String> response = _in::unsafeCast<self::PagingResponse<core::String>>(:result);
+          core::String result;
+          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
+            result = response{self::PagingResponse<core::String>}.{self::Response::data} as{TypeError,ForDynamic,ForNonNullableByDefault} core::String;
+          }
+          else
+            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
+              result = response{self::PagingResponse<core::String>}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} core::String;
+            }
+            else
+              if(response is{ForNonNullableByDefault} core::String) {
+                result = response{self::PagingResponse<core::String>};
+              }
+              else {
+                throw core::Exception::•("Invalid response type");
+              }
+          :return_value = result;
+          break #L3;
+        }
+        asy::_completeOnAsyncReturn(:async_completer, :return_value);
+        return;
+      }
+      on dynamic catch(dynamic exception, core::StackTrace stack_trace) {
+        :async_completer.{asy::Completer::completeError}(exception, stack_trace);
+      }
+    :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
+    :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
+    :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
+    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
+    return :async_completer.{asy::Completer::future};
+  }
+}
+class Class2 extends self::_Class2&Object&TestMixin {
+  synthetic constructor •() → self::Class2
+    : super self::_Class2&Object&TestMixin::•()
+    ;
+  method _test() → dynamic {
+    final self::PagingResponse<core::String> response = new self::PagingResponse::•<core::String>(new self::PagingResponseData::•<core::String>(<core::String>["test"]));
+    this.{self::TestMixin::test}(asy::Future::value<self::PagingResponse<core::String>>(response));
+  }
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/.dart_tool/package_config.json b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/.dart_tool/package_config.json
new file mode 100644
index 0000000..bc435fb
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/.dart_tool/package_config.json
@@ -0,0 +1,18 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "allowed_package",
+      "rootUri": "../allowed_package/",
+      "packageUri": "lib/",
+      "languageVersion": "2.9"
+    },
+    {
+      "name": "not_allowed_package",
+      "rootUri": "../not_allowed_package/",
+      "packageUri": "lib/",
+      "languageVersion": "2.9"
+    }
+
+  ]
+}
\ No newline at end of file
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/unversioned_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/unversioned_lib.dart
new file mode 100644
index 0000000..d57287d
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/unversioned_lib.dart
@@ -0,0 +1,5 @@
+// Copyright (c) 2020, 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.
+
+int? versionedAllowedPackage; // ok
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_10_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_10_lib.dart
new file mode 100644
index 0000000..d432653
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_10_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.10
+
+int? versioned_2_10_AllowedPackage; // ok
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart
new file mode 100644
index 0000000..b3c0c6d
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.8
+
+int? versioned_2_8_AllowedPackage; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_9_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_9_lib.dart
new file mode 100644
index 0000000..2bf988c
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_9_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.9
+
+int? versionedAllowedPackage; // ok
\ No newline at end of file
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/link.options b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/link.options
new file mode 100644
index 0000000..dd5d6af
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/link.options
@@ -0,0 +1 @@
+--fix-nnbd-release-version
\ No newline at end of file
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart
new file mode 100644
index 0000000..40552ae
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2020, 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.
+
+import 'package:allowed_package/unversioned_lib.dart';
+import 'package:allowed_package/versioned_2_8_lib.dart';
+import 'package:allowed_package/versioned_2_9_lib.dart';
+import 'package:allowed_package/versioned_2_10_lib.dart';
+import 'package:not_allowed_package/unversioned_lib.dart';
+import 'package:not_allowed_package/versioned_2_8_lib.dart';
+import 'package:not_allowed_package/versioned_2_9_lib.dart';
+import 'package:not_allowed_package/versioned_2_10_lib.dart';
+import 'unversioned_lib.dart';
+import 'versioned_2_8_lib.dart';
+import 'versioned_2_9_lib.dart';
+import 'versioned_2_10_lib.dart';
+
+main() {}
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.textual_outline.expect b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.textual_outline.expect
new file mode 100644
index 0000000..d918938
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.textual_outline.expect
@@ -0,0 +1,14 @@
+import 'package:allowed_package/unversioned_lib.dart';
+import 'package:allowed_package/versioned_2_8_lib.dart';
+import 'package:allowed_package/versioned_2_9_lib.dart';
+import 'package:allowed_package/versioned_2_10_lib.dart';
+import 'package:not_allowed_package/unversioned_lib.dart';
+import 'package:not_allowed_package/versioned_2_8_lib.dart';
+import 'package:not_allowed_package/versioned_2_9_lib.dart';
+import 'package:not_allowed_package/versioned_2_10_lib.dart';
+import 'unversioned_lib.dart';
+import 'versioned_2_8_lib.dart';
+import 'versioned_2_9_lib.dart';
+import 'versioned_2_10_lib.dart';
+
+main() {}
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.textual_outline_modelled.expect b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.textual_outline_modelled.expect
new file mode 100644
index 0000000..9733a7a
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.textual_outline_modelled.expect
@@ -0,0 +1,14 @@
+import 'package:allowed_package/unversioned_lib.dart';
+import 'package:allowed_package/versioned_2_10_lib.dart';
+import 'package:allowed_package/versioned_2_8_lib.dart';
+import 'package:allowed_package/versioned_2_9_lib.dart';
+import 'package:not_allowed_package/unversioned_lib.dart';
+import 'package:not_allowed_package/versioned_2_10_lib.dart';
+import 'package:not_allowed_package/versioned_2_8_lib.dart';
+import 'package:not_allowed_package/versioned_2_9_lib.dart';
+import 'unversioned_lib.dart';
+import 'versioned_2_10_lib.dart';
+import 'versioned_2_8_lib.dart';
+import 'versioned_2_9_lib.dart';
+
+main() {}
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.weak.expect
new file mode 100644
index 0000000..d4de37b
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.weak.expect
@@ -0,0 +1,95 @@
+//
+// Problems outside component:
+//
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.9 or higher.
+// int? versioned_2_8_AllowedPackage; // error
+//    ^
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/allowed_package/lib/versioned_2_8_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.8
+// ^^^^^^^^^^^^
+//
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart:5:4: Error: Null safety features are disabled for this library.
+// Try removing the package language version or setting the language version to 2.10 or higher.
+// int? versionedUnallowedPackage; // error
+//    ^
+//
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
+// int? versioned_2_8_AllowedPackage; // error
+//    ^
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.8
+// ^^^^^^^^^^^^
+//
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
+// int? versioned_2_9_AllowedPackage; // error
+//    ^
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.9
+// ^^^^^^^^^^^^
+//
+library /*isNonNullableByDefault*/;
+import self as self;
+
+import "package:allowed_package/unversioned_lib.dart";
+import "package:allowed_package/versioned_2_8_lib.dart";
+import "package:allowed_package/versioned_2_9_lib.dart";
+import "package:allowed_package/versioned_2_10_lib.dart";
+import "package:not_allowed_package/unversioned_lib.dart";
+import "package:not_allowed_package/versioned_2_8_lib.dart";
+import "package:not_allowed_package/versioned_2_9_lib.dart";
+import "package:not_allowed_package/versioned_2_10_lib.dart";
+import "org-dartlang-testcase:///unversioned_lib.dart";
+import "org-dartlang-testcase:///versioned_2_8_lib.dart";
+import "org-dartlang-testcase:///versioned_2_9_lib.dart";
+import "org-dartlang-testcase:///versioned_2_10_lib.dart";
+
+static method main() → dynamic {}
+
+library /*isNonNullableByDefault*/;
+import self as self2;
+import "dart:core" as core;
+
+static field core::int? unversionedLibrary;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
+// int? versioned_2_8_Library; // error
+//    ^
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_8_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.8
+// ^^^^^^^^^^^^
+//
+import self as self3;
+import "dart:core" as core;
+
+static field core::int? versioned_2_8_Library;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
+// int? versioned_2_9_Library; // error
+//    ^
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_9_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.9
+// ^^^^^^^^^^^^
+//
+import self as self4;
+import "dart:core" as core;
+
+static field core::int? versioned_2_9_Library;
+
+library /*isNonNullableByDefault*/;
+import self as self5;
+import "dart:core" as core;
+
+static field core::int? versioned_2_10_Library;
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.weak.transformed.expect
new file mode 100644
index 0000000..65936ca
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/main.dart.weak.transformed.expect
@@ -0,0 +1,63 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+
+import "package:allowed_package/unversioned_lib.dart";
+import "package:allowed_package/versioned_2_8_lib.dart";
+import "package:allowed_package/versioned_2_9_lib.dart";
+import "package:allowed_package/versioned_2_10_lib.dart";
+import "package:not_allowed_package/unversioned_lib.dart";
+import "package:not_allowed_package/versioned_2_8_lib.dart";
+import "package:not_allowed_package/versioned_2_9_lib.dart";
+import "package:not_allowed_package/versioned_2_10_lib.dart";
+import "org-dartlang-testcase:///unversioned_lib.dart";
+import "org-dartlang-testcase:///versioned_2_8_lib.dart";
+import "org-dartlang-testcase:///versioned_2_9_lib.dart";
+import "org-dartlang-testcase:///versioned_2_10_lib.dart";
+
+static method main() → dynamic {}
+
+library /*isNonNullableByDefault*/;
+import self as self2;
+import "dart:core" as core;
+
+static field core::int? unversionedLibrary;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
+// int? versioned_2_8_Library; // error
+//    ^
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_8_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.8
+// ^^^^^^^^^^^^
+//
+import self as self3;
+import "dart:core" as core;
+
+static field core::int? versioned_2_8_Library;
+
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: Null safety features are disabled for this library.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
+// int? versioned_2_9_Library; // error
+//    ^
+// pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_9_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
+// // @dart=2.9
+// ^^^^^^^^^^^^
+//
+import self as self4;
+import "dart:core" as core;
+
+static field core::int? versioned_2_9_Library;
+
+library /*isNonNullableByDefault*/;
+import self as self5;
+import "dart:core" as core;
+
+static field core::int? versioned_2_10_Library;
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart
new file mode 100644
index 0000000..10bfda8
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart
@@ -0,0 +1,5 @@
+// Copyright (c) 2020, 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.
+
+int? versionedUnallowedPackage; // error
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart
new file mode 100644
index 0000000..0a33913
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.10
+
+int? versionedAllowedPackage; // ok
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart
new file mode 100644
index 0000000..b3c0c6d
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.8
+
+int? versioned_2_8_AllowedPackage; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart
new file mode 100644
index 0000000..ff693f6
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.9
+
+int? versioned_2_9_AllowedPackage; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/unversioned_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/unversioned_lib.dart
new file mode 100644
index 0000000..3824327
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/unversioned_lib.dart
@@ -0,0 +1,5 @@
+// Copyright (c) 2020, 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.
+
+int? unversionedLibrary;
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_10_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_10_lib.dart
new file mode 100644
index 0000000..3268ee9
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_10_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.10
+
+int? versioned_2_10_Library; // ok
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_8_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_8_lib.dart
new file mode 100644
index 0000000..83fa3c6
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_8_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.8
+
+int? versioned_2_8_Library; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_9_lib.dart b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_9_lib.dart
new file mode 100644
index 0000000..7a9a3ee
--- /dev/null
+++ b/pkg/front_end/testcases/nnbd_mixed/experiment_release_version/versioned_2_9_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.9
+
+int? versioned_2_9_Library; // error
\ No newline at end of file
diff --git a/pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart.weak.expect
index 086abe6..a706f8a 100644
--- a/pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart.weak.expect
@@ -12,7 +12,7 @@
 // Problems in library:
 //
 // pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart:21:52: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // class LegacyClass4c implements GenericInterface<num?> {}
 //                                                    ^
 // pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
diff --git a/pkg/front_end/testcases/nnbd_mixed/issue41597.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/issue41597.dart.weak.expect
index c1f54a1..d17df18 100644
--- a/pkg/front_end/testcases/nnbd_mixed/issue41597.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/issue41597.dart.weak.expect
@@ -97,7 +97,7 @@
 //      ^
 //
 // pkg/front_end/testcases/nnbd_mixed/issue41597_lib.dart:10:8: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   c?..f!;
 //        ^
 // pkg/front_end/testcases/nnbd_mixed/issue41597_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
diff --git a/pkg/front_end/testcases/nnbd_mixed/issue41597.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/issue41597.dart.weak.transformed.expect
index 7c7517a..d14676f 100644
--- a/pkg/front_end/testcases/nnbd_mixed/issue41597.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/issue41597.dart.weak.transformed.expect
@@ -97,7 +97,7 @@
 //      ^
 //
 // pkg/front_end/testcases/nnbd_mixed/issue41597_lib.dart:10:8: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   c?..f!;
 //        ^
 // pkg/front_end/testcases/nnbd_mixed/issue41597_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
diff --git a/pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart.weak.expect
index bdccfd5..b7359ad 100644
--- a/pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart.weak.expect
@@ -3,7 +3,7 @@
 // Problems in library:
 //
 // pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart:7:4: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // int? i;
 //    ^
 // pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
diff --git a/pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart.weak.transformed.expect
index bdccfd5..b7359ad 100644
--- a/pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart.weak.transformed.expect
@@ -3,7 +3,7 @@
 // Problems in library:
 //
 // pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart:7:4: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // int? i;
 //    ^
 // pkg/front_end/testcases/nnbd_mixed/null_safety_invalid_language_version.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
diff --git a/pkg/front_end/testcases/nnbd_mixed/opt_out.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/opt_out.dart.weak.expect
index 0568c0b..2c1fe98 100644
--- a/pkg/front_end/testcases/nnbd_mixed/opt_out.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/opt_out.dart.weak.expect
@@ -44,7 +44,7 @@
 // Problems in library:
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:18:25: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // class B extends A<String?> {}
 //                         ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -52,19 +52,15 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:20:28: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // typedef F = void Function()?;
 //                            ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
 // // @dart=2.5
 // ^^^^^^^^^^^^
 //
-// pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:20:11: Error: Can't create typedef from nullable type.
-// typedef F = void Function()?;
-//           ^
-//
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:22:12: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // List<String?> l = [];
 //            ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -72,7 +68,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:23:7: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // String? s = null;
 //       ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -80,7 +76,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:28:21: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // void method(void f()?, {int a}) {}
 //                     ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -88,7 +84,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:24:10: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // var t = s!;
 //          ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -96,7 +92,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:32:14: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   List<String?> l = null;
 //              ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -104,7 +100,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:33:9: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   String? s = null;
 //         ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -112,7 +108,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:34:12: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   var t = s!;
 //            ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -128,7 +124,7 @@
 //      ^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:37:5: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   c?[0];
 //     ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -138,7 +134,7 @@
 import self as self2;
 import "dart:core" as core;
 
-typedef F = invalid-type;
+typedef F = () →? void;
 class A<T extends core::Object* = dynamic> extends core::Object {
   field core::int* field = 42;
   synthetic constructor •() → self2::A<self2::A::T*>*
diff --git a/pkg/front_end/testcases/nnbd_mixed/opt_out.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/opt_out.dart.weak.transformed.expect
index 0568c0b..2c1fe98 100644
--- a/pkg/front_end/testcases/nnbd_mixed/opt_out.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/opt_out.dart.weak.transformed.expect
@@ -44,7 +44,7 @@
 // Problems in library:
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:18:25: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // class B extends A<String?> {}
 //                         ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -52,19 +52,15 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:20:28: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // typedef F = void Function()?;
 //                            ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
 // // @dart=2.5
 // ^^^^^^^^^^^^
 //
-// pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:20:11: Error: Can't create typedef from nullable type.
-// typedef F = void Function()?;
-//           ^
-//
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:22:12: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // List<String?> l = [];
 //            ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -72,7 +68,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:23:7: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // String? s = null;
 //       ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -80,7 +76,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:28:21: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // void method(void f()?, {int a}) {}
 //                     ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -88,7 +84,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:24:10: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 // var t = s!;
 //          ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -96,7 +92,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:32:14: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   List<String?> l = null;
 //              ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -104,7 +100,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:33:9: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   String? s = null;
 //         ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -112,7 +108,7 @@
 // ^^^^^^^^^^^^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:34:12: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   var t = s!;
 //            ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -128,7 +124,7 @@
 //      ^
 //
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:37:5: Error: Null safety features are disabled for this library.
-// Try removing the `@dart=` annotation or setting the language version higher.
+// Try removing the `@dart=` annotation or setting the language version to 2.10 or higher.
 //   c?[0];
 //     ^
 // pkg/front_end/testcases/nnbd_mixed/opt_out_lib.dart:5:1: Context: This is the annotation that opts out this library from null safety features.
@@ -138,7 +134,7 @@
 import self as self2;
 import "dart:core" as core;
 
-typedef F = invalid-type;
+typedef F = () →? void;
 class A<T extends core::Object* = dynamic> extends core::Object {
   field core::int* field = 42;
   synthetic constructor •() → self2::A<self2::A::T*>*
diff --git a/pkg/front_end/tool/_fasta/generate_experimental_flags.dart b/pkg/front_end/tool/_fasta/generate_experimental_flags.dart
index be81eb8..8f16842 100644
--- a/pkg/front_end/tool/_fasta/generate_experimental_flags.dart
+++ b/pkg/front_end/tool/_fasta/generate_experimental_flags.dart
@@ -184,6 +184,54 @@
   }
   sb.write('''
 };
+
+const Map<ExperimentalFlag, Version> experimentEnabledVersion = {
+''');
+  for (String key in keys) {
+    int major;
+    int minor;
+    String enabledIn =
+        getAsVersionNumberString((features[key] as YamlMap)['enabledIn']);
+    if (enabledIn != null) {
+      List<String> split = enabledIn.split(".");
+      major = int.parse(split[0]);
+      minor = int.parse(split[1]);
+    } else {
+      major = currentVersionMajor;
+      minor = currentVersionMinor;
+    }
+    sb.writeln('  ExperimentalFlag.${keyToIdentifier(key)}: '
+        'const Version($major, $minor),');
+  }
+  sb.write('''
+};
+
+const Map<ExperimentalFlag, Version> experimentReleasedVersion = {
+''');
+  for (String key in keys) {
+    int major;
+    int minor;
+    String enabledIn =
+        getAsVersionNumberString((features[key] as YamlMap)['enabledIn']);
+    String experimentalReleaseVersion = getAsVersionNumberString(
+        (features[key] as YamlMap)['experimentalReleaseVersion']);
+    if (experimentalReleaseVersion != null) {
+      List<String> split = experimentalReleaseVersion.split(".");
+      major = int.parse(split[0]);
+      minor = int.parse(split[1]);
+    } else if (enabledIn != null) {
+      List<String> split = enabledIn.split(".");
+      major = int.parse(split[0]);
+      minor = int.parse(split[1]);
+    } else {
+      major = currentVersionMajor;
+      minor = currentVersionMinor;
+    }
+    sb.writeln('  ExperimentalFlag.${keyToIdentifier(key)}: '
+        'const Version($major, $minor),');
+  }
+  sb.write('''
+};
   
 ''');
 
diff --git a/pkg/kernel/lib/ast.dart b/pkg/kernel/lib/ast.dart
index 6a70b35..bbde631 100644
--- a/pkg/kernel/lib/ast.dart
+++ b/pkg/kernel/lib/ast.dart
@@ -3059,8 +3059,32 @@
       return context.typeEnvironment.coreTypes
           .bottomInterfaceType(superclass, context.nonNullable);
     }
-    context.typeEnvironment
-        .typeError(this, '$type is not a subtype of $superclass');
+
+    // The static type of this expression is not a subtype of [superclass]. The
+    // means that the static type of this expression is not the same as when
+    // the parent [PropertyGet] or [MethodInvocation] was created.
+    //
+    // For instance when cloning generic mixin methods, the substitution can
+    // render some of the code paths as dead code:
+    //
+    //     mixin M<T> {
+    //       int method(T t) => t is String ? t.length : 0;
+    //     }
+    //     class C with M<int> {}
+    //
+    // The mixin transformation will clone the `M.method` method into the
+    // unnamed mixin application for `Object&M<int>` as this:
+    //
+    //     int method(int t) => t is String ? t.length : 0;
+    //
+    // Now `t.length`, which was originally an access to `String.length` on a
+    // receiver of type `T & String`, is an access to `String.length` on `int`.
+    // When computing the static type of `t.length` we will try to compute the
+    // type of `int` as an instance of `String`, and we do not find it to be
+    // an instance of `String`.
+    //
+    // To resolve this case we compute the type of `t.length` to be the type
+    // as if accessed on an unknown subtype `String`.
     return context.typeEnvironment.coreTypes
         .rawType(superclass, context.nonNullable);
   }
diff --git a/pkg/kernel/lib/type_environment.dart b/pkg/kernel/lib/type_environment.dart
index 04d02a6..a6f70ca 100644
--- a/pkg/kernel/lib/type_environment.dart
+++ b/pkg/kernel/lib/type_environment.dart
@@ -145,26 +145,6 @@
     }
   }
 
-  /// Called if the computation of a static type failed due to a type error.
-  ///
-  /// This should never happen in production.  The frontend should report type
-  /// errors, and either recover from the error during translation or abort
-  /// compilation if unable to recover.
-  ///
-  /// By default, this throws an exception, since programs in kernel are assumed
-  /// to be correctly typed.
-  ///
-  /// An [errorHandler] may be provided in order to override the default
-  /// behavior and tolerate the presence of type errors.  This can be useful for
-  /// debugging IR producers which are required to produce a strongly typed IR.
-  void typeError(TreeNode node, String message) {
-    if (errorHandler != null) {
-      errorHandler(node, message);
-    } else {
-      throw '$message in $node';
-    }
-  }
-
   /// True if [member] is a binary operator whose return type is defined by
   /// the both operand types.
   bool isSpecialCasedBinaryOperator(Procedure member,
diff --git a/pkg/nnbd_migration/lib/src/front_end/region_renderer.dart b/pkg/nnbd_migration/lib/src/front_end/region_renderer.dart
index 2d97c61..f719ceb 100644
--- a/pkg/nnbd_migration/lib/src/front_end/region_renderer.dart
+++ b/pkg/nnbd_migration/lib/src/front_end/region_renderer.dart
@@ -24,10 +24,13 @@
   /// of the HTML files used to view the content of those files.
   final PathMapper pathMapper;
 
+  /// The auth token for the current site, for use in generating URIs.
+  final String authToken;
+
   /// Initializes a newly created region page within the given [site]. The
   /// [unitInfo] provides the information needed to render the page.
-  RegionRenderer(
-      this.region, this.unitInfo, this.migrationInfo, this.pathMapper);
+  RegionRenderer(this.region, this.unitInfo, this.migrationInfo,
+      this.pathMapper, this.authToken);
 
   /// Returns the path context used to manipulate paths.
   path.Context get pathContext => migrationInfo.pathContext;
@@ -98,6 +101,7 @@
     var queryParams = {
       'offset': target.offset,
       if (target.line != null) 'line': target.line,
+      'authToken': authToken,
     }.entries.map((entry) => '${entry.key}=${entry.value}').join('&');
     return '${pathMapper.map(path)}?$queryParams';
   }
diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart b/pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart
index 0065755..5de078e 100644
--- a/pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart
+++ b/pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart
@@ -7687,7 +7687,7 @@
 ''';
 
 String _migration_js;
-// migration_dart md5 is 'c0fb0a28ec67147174ca2a23e0488e86'
+// migration_dart md5 is 'd04379013212a42347eb972f1bbcde3e'
 String _migration_js_base64 = '''
 KGZ1bmN0aW9uIGRhcnRQcm9ncmFtKCl7ZnVuY3Rpb24gY29weVByb3BlcnRpZXMoYSxiKXt2YXIgcz1P
 YmplY3Qua2V5cyhhKQpmb3IodmFyIHI9MDtyPHMubGVuZ3RoO3IrKyl7dmFyIHE9c1tyXQpiW3FdPWFb
@@ -9267,2317 +9267,2319 @@
 RWoobykrIiBhdCAiKSkKcT10LlgKcT1XLko2KEwuUTQoYS5lLFAuRUYoWyJsaW5lIixKLmoobCldLHEs
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-aWxkKHIpCnIuYXBwZW5kQ2hpbGQocy5jcmVhdGVUZXh0Tm9kZSgiTm8gcHJvcG9zZWQgZWRpdHMiKSl9
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-KCkpCnA9cC5ubSgwLHEpCnE9d2luZG93Lmhpc3RvcnkKcz10LnoKcj1wLmduRCgpCnEudG9TdHJpbmcK
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-bihhKXt2YXIgcz1KLmJiKGRvY3VtZW50LnF1ZXJ5U2VsZWN0b3IoIi5yb290IikudGV4dENvbnRlbnQs
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-dCxxPXIucXVlcnlTZWxlY3RvcihzKSxwPXIucXVlcnlTZWxlY3RvcigiLmNvZGUiKQpKLnRIKHEsYi5h
-LCQuS0coKSkKSi50SChwLGIuYiwkLktHKCkpCkwuTEgoYSxiLmQsYykKTC52VSgpCkwueVgoIi5jb2Rl
-IiwhMCkKTC55WChzLCEwKX0sCnRYOmZ1bmN0aW9uKGEsYil7dmFyIHMscixxLHAsbyxuLG0sbCxrLGos
-aSxoLGcsZj1kb2N1bWVudCxlPWYuY3JlYXRlRWxlbWVudCgidWwiKQphLmFwcGVuZENoaWxkKGUpCmZv
-cihzPWIubGVuZ3RoLHI9dC5aLHE9MDtxPGIubGVuZ3RoO2IubGVuZ3RoPT09c3x8KDAsSC5saykoYiks
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 ''';
diff --git a/pkg/nnbd_migration/lib/src/front_end/unit_renderer.dart b/pkg/nnbd_migration/lib/src/front_end/unit_renderer.dart
index c75973b..fbd5c8d 100644
--- a/pkg/nnbd_migration/lib/src/front_end/unit_renderer.dart
+++ b/pkg/nnbd_migration/lib/src/front_end/unit_renderer.dart
@@ -57,8 +57,12 @@
   /// of the HTML files used to view the content of those files.
   final PathMapper pathMapper;
 
+  /// The auth token for the current site, for use in generating URIs.
+  final String authToken;
+
   /// Creates an output object for the given library info.
-  UnitRenderer(this.unitInfo, this.migrationInfo, this.pathMapper);
+  UnitRenderer(
+      this.unitInfo, this.migrationInfo, this.pathMapper, this.authToken);
 
   /// Return the path context used to manipulate paths.
   path.Context get pathContext => migrationInfo.pathContext;
@@ -317,6 +321,7 @@
     var queryParams = {
       'offset': target.offset,
       if (target.line != null) 'line': target.line,
+      'authToken': authToken,
     }.entries.map((entry) => '${entry.key}=${entry.value}').join('&');
     return '$path?$queryParams';
   }
diff --git a/pkg/nnbd_migration/lib/src/front_end/web/migration.dart b/pkg/nnbd_migration/lib/src/front_end/web/migration.dart
index a60493b..c80f4db 100644
--- a/pkg/nnbd_migration/lib/src/front_end/web/migration.dart
+++ b/pkg/nnbd_migration/lib/src/front_end/web/migration.dart
@@ -574,7 +574,14 @@
         var line = edit.line;
         anchor.dataset['line'] = '$line';
         anchor.append(Text('line $line'));
+        anchor.setAttribute(
+            'href',
+            pathWithQueryParameters(window.location.pathname, {
+              'line': '$line',
+              'offset': '$offset',
+            }));
         anchor.onClick.listen((MouseEvent event) {
+          event.preventDefault();
           navigate(window.location.pathname, offset, line, true, callback: () {
             pushState(window.location.pathname, offset, line);
           });
@@ -687,7 +694,7 @@
       li.append(a);
       a.classes.add('nav-link');
       a.dataset['name'] = entity.path;
-      a.setAttribute('href', entity.href);
+      a.setAttribute('href', pathWithQueryParameters(entity.href, {}));
       a.append(Text(entity.name));
       a.onClick.listen((MouseEvent event) => handleNavLinkClick(event, true));
       var editCount = entity.editCount;
@@ -703,7 +710,7 @@
   }
 }
 
-AnchorElement _aElementForLink(TargetLink link, String parentDirectory) {
+AnchorElement _aElementForLink(TargetLink link) {
   var targetLine = link.line;
   AnchorElement a = AnchorElement();
   a.append(Text('${link.path}:$targetLine'));
@@ -754,7 +761,7 @@
       var link = entry.link;
       if (link != null) {
         li.append(Text(' ('));
-        li.append(_aElementForLink(link, parentDirectory));
+        li.append(_aElementForLink(link));
         li.append(Text(')'));
       }
       li.append(Text(': '));
diff --git a/pkg/nnbd_migration/lib/src/preview/dart_file_page.dart b/pkg/nnbd_migration/lib/src/preview/dart_file_page.dart
index 12aff05..b0d5e6c 100644
--- a/pkg/nnbd_migration/lib/src/preview/dart_file_page.dart
+++ b/pkg/nnbd_migration/lib/src/preview/dart_file_page.dart
@@ -31,7 +31,8 @@
 
   @override
   Future<void> generatePage(Map<String, String> params) async {
-    var renderer = UnitRenderer(unitInfo, site.migrationInfo, site.pathMapper);
+    var renderer = UnitRenderer(
+        unitInfo, site.migrationInfo, site.pathMapper, site.serviceAuthToken);
     buf.write(jsonEncode(renderer.render().toJson()));
   }
 }
diff --git a/pkg/nnbd_migration/lib/src/preview/region_page.dart b/pkg/nnbd_migration/lib/src/preview/region_page.dart
index cb8dd99..8b3cbab 100644
--- a/pkg/nnbd_migration/lib/src/preview/region_page.dart
+++ b/pkg/nnbd_migration/lib/src/preview/region_page.dart
@@ -30,8 +30,8 @@
   @override
   Future<void> generatePage(Map<String, String> params) async {
     var region = unitInfo.regionAt(int.parse(params['offset']));
-    var renderer =
-        RegionRenderer(region, unitInfo, site.migrationInfo, site.pathMapper);
+    var renderer = RegionRenderer(region, unitInfo, site.migrationInfo,
+        site.pathMapper, site.serviceAuthToken);
     buf.write(jsonEncode(renderer.render().toJson()));
   }
 }
diff --git a/pkg/nnbd_migration/test/fix_aggregator_test.dart b/pkg/nnbd_migration/test/fix_aggregator_test.dart
index b04ab18..7486bc1 100644
--- a/pkg/nnbd_migration/test/fix_aggregator_test.dart
+++ b/pkg/nnbd_migration/test/fix_aggregator_test.dart
@@ -2,14 +2,13 @@
 // 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.
 
-// ignore: deprecated_member_use
-import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/nullability_suffix.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/type_provider.dart';
+import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:nnbd_migration/nnbd_migration.dart';
 import 'package:nnbd_migration/src/decorated_type.dart';
 import 'package:nnbd_migration/src/edit_plan.dart';
diff --git a/pkg/nnbd_migration/test/front_end/region_renderer_test.dart b/pkg/nnbd_migration/test/front_end/region_renderer_test.dart
index 88307a0..bc329d1 100644
--- a/pkg/nnbd_migration/test/front_end/region_renderer_test.dart
+++ b/pkg/nnbd_migration/test/front_end/region_renderer_test.dart
@@ -31,7 +31,9 @@
     var unitInfo = infos.single;
     var region = unitInfo.regionAt(offset);
     pathMapper = PathMapper(resourceProvider);
-    return RegionRenderer(region, unitInfo, migrationInfo, pathMapper).render();
+    return RegionRenderer(
+            region, unitInfo, migrationInfo, pathMapper, 'AUTH_TOKEN')
+        .render();
   }
 
   Future<void> test_modifiedOutput_containsExplanation() async {
diff --git a/pkg/nnbd_migration/test/front_end/unit_renderer_test.dart b/pkg/nnbd_migration/test/front_end/unit_renderer_test.dart
index 3a932af..2604c89 100644
--- a/pkg/nnbd_migration/test/front_end/unit_renderer_test.dart
+++ b/pkg/nnbd_migration/test/front_end/unit_renderer_test.dart
@@ -29,9 +29,9 @@
 
     var contents = <FileDetails>[];
     for (var unitInfo in infos) {
-      contents.add(
-          UnitRenderer(unitInfo, migrationInfo, PathMapper(resourceProvider))
-              .render());
+      contents.add(UnitRenderer(unitInfo, migrationInfo,
+              PathMapper(resourceProvider), 'AUTH_TOKEN')
+          .render());
     }
     return contents;
   }
diff --git a/runtime/tests/vm/dart/regress_flutter_64526_test.dart b/runtime/tests/vm/dart/regress_flutter_64526_test.dart
new file mode 100644
index 0000000..efdc0ad
--- /dev/null
+++ b/runtime/tests/vm/dart/regress_flutter_64526_test.dart
@@ -0,0 +1,166 @@
+// Copyright (c) 2020, 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.
+//
+// Tests that functions with large number of optional positional parameters
+// are compiled correctly and don't overflow instruction encoding.
+
+import 'package:expect/expect.dart';
+
+class CCC {
+  var a00;
+  var a01;
+  var a02;
+  var a03;
+  var a04;
+  var a05;
+  var a06;
+  var a07;
+  var a08;
+  var a09;
+  var a10;
+  var a11;
+  var a12;
+  var a13;
+  var a14;
+  var a15;
+  var a16;
+  var a17;
+  var a18;
+  var a19;
+  var a20;
+  var a21;
+  var a22;
+  var a23;
+  var a24;
+  var a25;
+  var a26;
+  var a27;
+  var a28;
+  var a29;
+  var a30;
+  var a31;
+  var a32;
+  var a33;
+  var a34;
+  var a35;
+  var a36;
+  var a37;
+  var a38;
+  var a39;
+  var a40;
+  var a41;
+  var a42;
+  var a43;
+  var a44;
+  var a45;
+  var a46;
+  var a47;
+  var a48;
+  var a49;
+  CCC(
+      [this.a00 = 'a00',
+      this.a01 = 'a01',
+      this.a02 = 'a02',
+      this.a03 = 'a03',
+      this.a04 = 'a04',
+      this.a05 = 'a05',
+      this.a06 = 'a06',
+      this.a07 = 'a07',
+      this.a08 = 'a08',
+      this.a09 = 'a09',
+      this.a10 = 'a10',
+      this.a11 = 'a11',
+      this.a12 = 'a12',
+      this.a13 = 'a13',
+      this.a14 = 'a14',
+      this.a15 = 'a15',
+      this.a16 = 'a16',
+      this.a17 = 'a17',
+      this.a18 = 'a18',
+      this.a19 = 'a19',
+      this.a20 = 'a20',
+      this.a21 = 'a21',
+      this.a22 = 'a22',
+      this.a23 = 'a23',
+      this.a24 = 'a24',
+      this.a25 = 'a25',
+      this.a26 = 'a26',
+      this.a27 = 'a27',
+      this.a28 = 'a28',
+      this.a29 = 'a29',
+      this.a30 = 'a30',
+      this.a31 = 'a31',
+      this.a32 = 'a32',
+      this.a33 = 'a33',
+      this.a34 = 'a34',
+      this.a35 = 'a35',
+      this.a36 = 'a36',
+      this.a37 = 'a37',
+      this.a38 = 'a38',
+      this.a39 = 'a39',
+      this.a40 = 'a40',
+      this.a41 = 'a41',
+      this.a42 = 'a42',
+      this.a43 = 'a43',
+      this.a44 = 'a44',
+      this.a45 = 'a45',
+      this.a46 = 'a46',
+      this.a47 = 'a47',
+      this.a48 = 'a48',
+      this.a49 = 'a49']) {}
+}
+
+void main() {
+  final o = CCC();
+  Expect.equals('a00', o.a00);
+  Expect.equals('a01', o.a01);
+  Expect.equals('a02', o.a02);
+  Expect.equals('a03', o.a03);
+  Expect.equals('a04', o.a04);
+  Expect.equals('a05', o.a05);
+  Expect.equals('a06', o.a06);
+  Expect.equals('a07', o.a07);
+  Expect.equals('a08', o.a08);
+  Expect.equals('a09', o.a09);
+  Expect.equals('a10', o.a10);
+  Expect.equals('a11', o.a11);
+  Expect.equals('a12', o.a12);
+  Expect.equals('a13', o.a13);
+  Expect.equals('a14', o.a14);
+  Expect.equals('a15', o.a15);
+  Expect.equals('a16', o.a16);
+  Expect.equals('a17', o.a17);
+  Expect.equals('a18', o.a18);
+  Expect.equals('a19', o.a19);
+  Expect.equals('a20', o.a20);
+  Expect.equals('a21', o.a21);
+  Expect.equals('a22', o.a22);
+  Expect.equals('a23', o.a23);
+  Expect.equals('a24', o.a24);
+  Expect.equals('a25', o.a25);
+  Expect.equals('a26', o.a26);
+  Expect.equals('a27', o.a27);
+  Expect.equals('a28', o.a28);
+  Expect.equals('a29', o.a29);
+  Expect.equals('a30', o.a30);
+  Expect.equals('a31', o.a31);
+  Expect.equals('a32', o.a32);
+  Expect.equals('a33', o.a33);
+  Expect.equals('a34', o.a34);
+  Expect.equals('a35', o.a35);
+  Expect.equals('a36', o.a36);
+  Expect.equals('a37', o.a37);
+  Expect.equals('a38', o.a38);
+  Expect.equals('a39', o.a39);
+  Expect.equals('a40', o.a40);
+  Expect.equals('a41', o.a41);
+  Expect.equals('a42', o.a42);
+  Expect.equals('a43', o.a43);
+  Expect.equals('a44', o.a44);
+  Expect.equals('a45', o.a45);
+  Expect.equals('a46', o.a46);
+  Expect.equals('a47', o.a47);
+  Expect.equals('a48', o.a48);
+  Expect.equals('a49', o.a49);
+}
diff --git a/runtime/tests/vm/dart_2/regress_flutter_64526_test.dart b/runtime/tests/vm/dart_2/regress_flutter_64526_test.dart
new file mode 100644
index 0000000..efdc0ad
--- /dev/null
+++ b/runtime/tests/vm/dart_2/regress_flutter_64526_test.dart
@@ -0,0 +1,166 @@
+// Copyright (c) 2020, 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.
+//
+// Tests that functions with large number of optional positional parameters
+// are compiled correctly and don't overflow instruction encoding.
+
+import 'package:expect/expect.dart';
+
+class CCC {
+  var a00;
+  var a01;
+  var a02;
+  var a03;
+  var a04;
+  var a05;
+  var a06;
+  var a07;
+  var a08;
+  var a09;
+  var a10;
+  var a11;
+  var a12;
+  var a13;
+  var a14;
+  var a15;
+  var a16;
+  var a17;
+  var a18;
+  var a19;
+  var a20;
+  var a21;
+  var a22;
+  var a23;
+  var a24;
+  var a25;
+  var a26;
+  var a27;
+  var a28;
+  var a29;
+  var a30;
+  var a31;
+  var a32;
+  var a33;
+  var a34;
+  var a35;
+  var a36;
+  var a37;
+  var a38;
+  var a39;
+  var a40;
+  var a41;
+  var a42;
+  var a43;
+  var a44;
+  var a45;
+  var a46;
+  var a47;
+  var a48;
+  var a49;
+  CCC(
+      [this.a00 = 'a00',
+      this.a01 = 'a01',
+      this.a02 = 'a02',
+      this.a03 = 'a03',
+      this.a04 = 'a04',
+      this.a05 = 'a05',
+      this.a06 = 'a06',
+      this.a07 = 'a07',
+      this.a08 = 'a08',
+      this.a09 = 'a09',
+      this.a10 = 'a10',
+      this.a11 = 'a11',
+      this.a12 = 'a12',
+      this.a13 = 'a13',
+      this.a14 = 'a14',
+      this.a15 = 'a15',
+      this.a16 = 'a16',
+      this.a17 = 'a17',
+      this.a18 = 'a18',
+      this.a19 = 'a19',
+      this.a20 = 'a20',
+      this.a21 = 'a21',
+      this.a22 = 'a22',
+      this.a23 = 'a23',
+      this.a24 = 'a24',
+      this.a25 = 'a25',
+      this.a26 = 'a26',
+      this.a27 = 'a27',
+      this.a28 = 'a28',
+      this.a29 = 'a29',
+      this.a30 = 'a30',
+      this.a31 = 'a31',
+      this.a32 = 'a32',
+      this.a33 = 'a33',
+      this.a34 = 'a34',
+      this.a35 = 'a35',
+      this.a36 = 'a36',
+      this.a37 = 'a37',
+      this.a38 = 'a38',
+      this.a39 = 'a39',
+      this.a40 = 'a40',
+      this.a41 = 'a41',
+      this.a42 = 'a42',
+      this.a43 = 'a43',
+      this.a44 = 'a44',
+      this.a45 = 'a45',
+      this.a46 = 'a46',
+      this.a47 = 'a47',
+      this.a48 = 'a48',
+      this.a49 = 'a49']) {}
+}
+
+void main() {
+  final o = CCC();
+  Expect.equals('a00', o.a00);
+  Expect.equals('a01', o.a01);
+  Expect.equals('a02', o.a02);
+  Expect.equals('a03', o.a03);
+  Expect.equals('a04', o.a04);
+  Expect.equals('a05', o.a05);
+  Expect.equals('a06', o.a06);
+  Expect.equals('a07', o.a07);
+  Expect.equals('a08', o.a08);
+  Expect.equals('a09', o.a09);
+  Expect.equals('a10', o.a10);
+  Expect.equals('a11', o.a11);
+  Expect.equals('a12', o.a12);
+  Expect.equals('a13', o.a13);
+  Expect.equals('a14', o.a14);
+  Expect.equals('a15', o.a15);
+  Expect.equals('a16', o.a16);
+  Expect.equals('a17', o.a17);
+  Expect.equals('a18', o.a18);
+  Expect.equals('a19', o.a19);
+  Expect.equals('a20', o.a20);
+  Expect.equals('a21', o.a21);
+  Expect.equals('a22', o.a22);
+  Expect.equals('a23', o.a23);
+  Expect.equals('a24', o.a24);
+  Expect.equals('a25', o.a25);
+  Expect.equals('a26', o.a26);
+  Expect.equals('a27', o.a27);
+  Expect.equals('a28', o.a28);
+  Expect.equals('a29', o.a29);
+  Expect.equals('a30', o.a30);
+  Expect.equals('a31', o.a31);
+  Expect.equals('a32', o.a32);
+  Expect.equals('a33', o.a33);
+  Expect.equals('a34', o.a34);
+  Expect.equals('a35', o.a35);
+  Expect.equals('a36', o.a36);
+  Expect.equals('a37', o.a37);
+  Expect.equals('a38', o.a38);
+  Expect.equals('a39', o.a39);
+  Expect.equals('a40', o.a40);
+  Expect.equals('a41', o.a41);
+  Expect.equals('a42', o.a42);
+  Expect.equals('a43', o.a43);
+  Expect.equals('a44', o.a44);
+  Expect.equals('a45', o.a45);
+  Expect.equals('a46', o.a46);
+  Expect.equals('a47', o.a47);
+  Expect.equals('a48', o.a48);
+  Expect.equals('a49', o.a49);
+}
diff --git a/runtime/vm/compiler/backend/il_arm.cc b/runtime/vm/compiler/backend/il_arm.cc
index 1c3daa9..df51c7d 100644
--- a/runtime/vm/compiler/backend/il_arm.cc
+++ b/runtime/vm/compiler/backend/il_arm.cc
@@ -104,7 +104,7 @@
     case kTagged: {
       const auto out = locs()->out(0).reg();
       __ add(out, base_reg(), compiler::Operand(index, LSL, 1));
-      __ ldr(out, compiler::Address(out, offset()));
+      __ LoadFromOffset(kWord, out, out, offset());
       break;
     }
     case kUnboxedInt64: {
@@ -112,9 +112,9 @@
       const auto out_hi = locs()->out(0).AsPairLocation()->At(1).reg();
 
       __ add(out_hi, base_reg(), compiler::Operand(index, LSL, 1));
-      __ ldr(out_lo, compiler::Address(out_hi, offset()));
-      __ ldr(out_hi,
-             compiler::Address(out_hi, offset() + compiler::target::kWordSize));
+      __ LoadFromOffset(kWord, out_lo, out_hi, offset());
+      __ LoadFromOffset(kWord, out_hi, out_hi,
+                        offset() + compiler::target::kWordSize);
       break;
     }
     case kUnboxedDouble: {
@@ -3257,18 +3257,15 @@
                                       : Location::RequiresRegister());
 
   if (slot().representation() != kTagged) {
-    switch (slot().representation()) {
-      case kUnboxedInt64:
-        ASSERT(FLAG_precompiled_mode);
-        locs->set_out(0, Location::Pair(Location::RequiresRegister(),
-                                        Location::RequiresRegister()));
-        break;
-      case kUnboxedUint32:
-        locs->set_out(0, Location::RequiresRegister());
-        break;
-      default:
-        UNIMPLEMENTED();
-        break;
+    ASSERT(RepresentationUtils::IsUnboxedInteger(slot().representation()));
+    const size_t value_size =
+        RepresentationUtils::ValueSize(slot().representation());
+    if (value_size <= compiler::target::kWordSize) {
+      locs->set_out(0, Location::RequiresRegister());
+    } else {
+      ASSERT(value_size <= 2 * compiler::target::kWordSize);
+      locs->set_out(0, Location::Pair(Location::RequiresRegister(),
+                                      Location::RequiresRegister()));
     }
   } else if (IsUnboxedDartFieldLoad() && opt) {
     ASSERT(!calls_initializer());
@@ -3302,19 +3299,18 @@
     ASSERT(!calls_initializer());
     switch (slot().representation()) {
       case kUnboxedInt64: {
-        const PairLocation* out_pair = locs()->out(0).AsPairLocation();
+        auto const out_pair = locs()->out(0).AsPairLocation();
         const Register out_lo = out_pair->At(0).reg();
         const Register out_hi = out_pair->At(1).reg();
+        const intptr_t offset_lo = OffsetInBytes() - kHeapObjectTag;
+        const intptr_t offset_hi = offset_lo + compiler::target::kWordSize;
         __ Comment("UnboxedInt64LoadFieldInstr");
-        __ LoadFromOffset(kWord, out_lo, instance_reg,
-                          OffsetInBytes() - kHeapObjectTag);
-        __ LoadFromOffset(
-            kWord, out_hi, instance_reg,
-            OffsetInBytes() - kHeapObjectTag + compiler::target::kWordSize);
+        __ LoadFromOffset(kWord, out_lo, instance_reg, offset_lo);
+        __ LoadFromOffset(kWord, out_hi, instance_reg, offset_hi);
         break;
       }
       case kUnboxedUint32: {
-        Register result = locs()->out(0).reg();
+        const Register result = locs()->out(0).reg();
         __ Comment("UnboxedUint32LoadFieldInstr");
         __ LoadFieldFromOffset(kWord, result, instance_reg, OffsetInBytes());
         break;
diff --git a/runtime/vm/compiler/backend/il_arm64.cc b/runtime/vm/compiler/backend/il_arm64.cc
index 8b5e746..c0ec0b2 100644
--- a/runtime/vm/compiler/backend/il_arm64.cc
+++ b/runtime/vm/compiler/backend/il_arm64.cc
@@ -94,7 +94,7 @@
     case kUnboxedInt64: {
       const auto out = locs()->out(0).reg();
       __ add(out, base_reg(), compiler::Operand(index, LSL, 2));
-      __ ldr(out, compiler::Address(out, offset()));
+      __ LoadFromOffset(out, out, offset());
       break;
     }
     case kUnboxedDouble: {
@@ -2756,16 +2756,21 @@
 LocationSummary* LoadFieldInstr::MakeLocationSummary(Zone* zone,
                                                      bool opt) const {
   const intptr_t kNumInputs = 1;
-  const intptr_t kNumTemps = (IsUnboxedDartFieldLoad() && opt)
-                                 ? (FLAG_precompiled_mode ? 0 : 1)
-                                 : (IsPotentialUnboxedDartFieldLoad() ? 1 : 0);
+  const intptr_t kNumTemps =
+      (slot().representation() != kTagged)
+          ? 0
+          : ((IsUnboxedDartFieldLoad() && opt)
+                 ? (FLAG_precompiled_mode ? 0 : 1)
+                 : (IsPotentialUnboxedDartFieldLoad() ? 1 : 0));
   const auto contains_call =
-      (IsUnboxedDartFieldLoad() && opt)
+      (slot().representation() != kTagged)
           ? LocationSummary::kNoCall
-          : (IsPotentialUnboxedDartFieldLoad()
-                 ? LocationSummary::kCallOnSlowPath
-                 : (calls_initializer() ? LocationSummary::kCall
-                                        : LocationSummary::kNoCall));
+          : ((IsUnboxedDartFieldLoad() && opt)
+                 ? LocationSummary::kNoCall
+                 : (IsPotentialUnboxedDartFieldLoad()
+                        ? LocationSummary::kCallOnSlowPath
+                        : (calls_initializer() ? LocationSummary::kCall
+                                               : LocationSummary::kNoCall)));
 
   LocationSummary* locs =
       new (zone) LocationSummary(zone, kNumInputs, kNumTemps, contains_call);
@@ -2774,8 +2779,15 @@
                                             InitInstanceFieldABI::kInstanceReg)
                                       : Location::RequiresRegister());
 
-  if (IsUnboxedDartFieldLoad() && opt) {
+  if (slot().representation() != kTagged) {
     ASSERT(!calls_initializer());
+    ASSERT(RepresentationUtils::IsUnboxedInteger(slot().representation()));
+    ASSERT(RepresentationUtils::ValueSize(slot().representation()) <=
+           compiler::target::kWordSize);
+    locs->set_out(0, Location::RequiresRegister());
+  } else if (IsUnboxedDartFieldLoad() && opt) {
+    ASSERT(!calls_initializer());
+    ASSERT(!slot().field().is_non_nullable_integer());
     if (!FLAG_precompiled_mode) {
       locs->set_temp(0, Location::RequiresRegister());
     }
@@ -2799,10 +2811,26 @@
   ASSERT(sizeof(FieldLayout::is_nullable_) == 2);
 
   const Register instance_reg = locs()->in(0).reg();
+  if (slot().representation() != kTagged) {
+    const Register result_reg = locs()->out(0).reg();
+    switch (slot().representation()) {
+      case kUnboxedInt64:
+        __ Comment("UnboxedInt64LoadFieldInstr");
+        __ LoadFieldFromOffset(result_reg, instance_reg, OffsetInBytes());
+        break;
+      case kUnboxedUint32:
+        __ Comment("UnboxedUint32LoadFieldInstr");
+        __ LoadFieldFromOffset(result_reg, instance_reg, OffsetInBytes(),
+                               kUnsignedWord);
+        break;
+      default:
+        UNIMPLEMENTED();
+        break;
+    }
+    return;
+  }
+
   if (IsUnboxedDartFieldLoad() && compiler->is_optimizing()) {
-    ASSERT_EQUAL(slot().representation(), kTagged);
-    ASSERT(!calls_initializer());
-    ASSERT(!slot().field().is_non_nullable_integer());
     const VRegister result = locs()->out(0).fpu_reg();
     const intptr_t cid = slot().field().UnboxedFieldCid();
 
@@ -2848,8 +2876,6 @@
   compiler::Label done;
   const Register result_reg = locs()->out(0).reg();
   if (IsPotentialUnboxedDartFieldLoad()) {
-    ASSERT_EQUAL(slot().representation(), kTagged);
-    ASSERT(!calls_initializer());
     const Register temp = locs()->temp(0).reg();
 
     compiler::Label load_pointer;
@@ -2920,26 +2946,6 @@
     __ Bind(&load_pointer);
   }
 
-  if (slot().representation() != kTagged) {
-    ASSERT(!calls_initializer());
-    const Register result = locs()->out(0).reg();
-    switch (slot().representation()) {
-      case kUnboxedInt64:
-        __ Comment("UnboxedInt64LoadFieldInstr");
-        __ LoadFieldFromOffset(result, instance_reg, OffsetInBytes());
-        break;
-      case kUnboxedUint32:
-        __ Comment("UnboxedUint32LoadFieldInstr");
-        __ LoadFieldFromOffset(result, instance_reg, OffsetInBytes(),
-                               kUnsignedWord);
-        break;
-      default:
-        UNIMPLEMENTED();
-        break;
-    }
-    return;
-  }
-
   __ LoadFieldFromOffset(result_reg, instance_reg, OffsetInBytes());
 
   if (calls_initializer()) {
diff --git a/runtime/vm/compiler/backend/il_ia32.cc b/runtime/vm/compiler/backend/il_ia32.cc
index 45958f9..767fb3f 100644
--- a/runtime/vm/compiler/backend/il_ia32.cc
+++ b/runtime/vm/compiler/backend/il_ia32.cc
@@ -2536,17 +2536,21 @@
                                                      bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps =
-      (IsUnboxedDartFieldLoad() && opt)
-          ? 1
-          : ((IsPotentialUnboxedDartFieldLoad()) ? 2 : 0);
+      (slot().representation() != kTagged)
+          ? 0
+          : ((IsUnboxedDartFieldLoad() && opt)
+                 ? 1
+                 : ((IsPotentialUnboxedDartFieldLoad()) ? 2 : 0));
 
   const auto contains_call =
-      (IsUnboxedDartFieldLoad() && opt)
+      (slot().representation() != kTagged)
           ? LocationSummary::kNoCall
-          : (IsPotentialUnboxedDartFieldLoad()
-                 ? LocationSummary::kCallOnSlowPath
-                 : (calls_initializer() ? LocationSummary::kCall
-                                        : LocationSummary::kNoCall));
+          : ((IsUnboxedDartFieldLoad() && opt)
+                 ? LocationSummary::kNoCall
+                 : (IsPotentialUnboxedDartFieldLoad()
+                        ? LocationSummary::kCallOnSlowPath
+                        : (calls_initializer() ? LocationSummary::kCall
+                                               : LocationSummary::kNoCall)));
 
   LocationSummary* locs =
       new (zone) LocationSummary(zone, kNumInputs, kNumTemps, contains_call);
@@ -2555,18 +2559,35 @@
                                             InitInstanceFieldABI::kInstanceReg)
                                       : Location::RequiresRegister());
 
-  if (IsUnboxedDartFieldLoad() && opt) {
+  if (slot().representation() != kTagged) {
+    ASSERT(!calls_initializer());
+    ASSERT(RepresentationUtils::IsUnboxedInteger(slot().representation()));
+    const size_t value_size =
+        RepresentationUtils::ValueSize(slot().representation());
+    if (value_size <= compiler::target::kWordSize) {
+      locs->set_out(0, Location::RequiresRegister());
+    } else {
+      ASSERT(value_size <= 2 * compiler::target::kWordSize);
+      locs->set_out(0, Location::Pair(Location::RequiresRegister(),
+                                      Location::RequiresRegister()));
+    }
+  } else if (IsUnboxedDartFieldLoad() && opt) {
     ASSERT(!calls_initializer());
     locs->set_temp(0, Location::RequiresRegister());
+    locs->set_out(0, Location::RequiresFpuRegister());
   } else if (IsPotentialUnboxedDartFieldLoad()) {
     ASSERT(!calls_initializer());
     locs->set_temp(0, opt ? Location::RequiresFpuRegister()
                           : Location::FpuRegisterLocation(XMM1));
     locs->set_temp(1, Location::RequiresRegister());
+    locs->set_out(0, Location::RequiresRegister());
+  } else if (calls_initializer()) {
+    locs->set_out(0,
+                  Location::RegisterLocation(InitInstanceFieldABI::kResultReg));
+  } else {
+    locs->set_out(0, Location::RequiresRegister());
   }
-  locs->set_out(0, calls_initializer() ? Location::RegisterLocation(
-                                             InitInstanceFieldABI::kResultReg)
-                                       : Location::RequiresRegister());
+
   return locs;
 }
 
@@ -2576,9 +2597,33 @@
   ASSERT(sizeof(FieldLayout::is_nullable_) == 2);
 
   const Register instance_reg = locs()->in(0).reg();
+  if (slot().representation() != kTagged) {
+    switch (slot().representation()) {
+      case kUnboxedInt64: {
+        auto const out_pair = locs()->out(0).AsPairLocation();
+        const Register out_lo = out_pair->At(0).reg();
+        const Register out_hi = out_pair->At(1).reg();
+        const intptr_t offset_lo = OffsetInBytes();
+        const intptr_t offset_hi = offset_lo + compiler::target::kWordSize;
+        __ Comment("UnboxedInt64LoadFieldInstr");
+        __ movl(out_lo, compiler::FieldAddress(instance_reg, offset_lo));
+        __ movl(out_hi, compiler::FieldAddress(instance_reg, offset_hi));
+        break;
+      }
+      case kUnboxedUint32: {
+        const Register result = locs()->out(0).reg();
+        __ Comment("UnboxedUint32LoadFieldInstr");
+        __ movl(result, compiler::FieldAddress(instance_reg, OffsetInBytes()));
+        break;
+      }
+      default:
+        UNIMPLEMENTED();
+        break;
+    }
+    return;
+  }
+
   if (IsUnboxedDartFieldLoad() && compiler->is_optimizing()) {
-    ASSERT_EQUAL(slot().representation(), kTagged);
-    ASSERT(!calls_initializer());
     XmmRegister result = locs()->out(0).fpu_reg();
     Register temp = locs()->temp(0).reg();
     __ movl(temp, compiler::FieldAddress(instance_reg, OffsetInBytes()));
@@ -2605,10 +2650,8 @@
   }
 
   compiler::Label done;
-  Register result = locs()->out(0).reg();
+  const Register result = locs()->out(0).reg();
   if (IsPotentialUnboxedDartFieldLoad()) {
-    ASSERT_EQUAL(slot().representation(), kTagged);
-    ASSERT(!calls_initializer());
     Register temp = locs()->temp(1).reg();
     XmmRegister value = locs()->temp(0).fpu_reg();
 
@@ -2678,22 +2721,6 @@
     __ Bind(&load_pointer);
   }
 
-  if (slot().representation() != kTagged) {
-    ASSERT(!calls_initializer());
-    Register result = locs()->out(0).reg();
-    compiler::FieldAddress address(instance_reg, OffsetInBytes());
-    switch (slot().representation()) {
-      case kUnboxedUint32:
-        __ Comment("UnboxedUint32LoadFieldInstr");
-        __ movl(result, address);
-        break;
-      default:
-        UNIMPLEMENTED();
-        break;
-    }
-    return;
-  }
-
   __ movl(result, compiler::FieldAddress(instance_reg, OffsetInBytes()));
 
   if (calls_initializer()) {
diff --git a/runtime/vm/compiler/backend/il_x64.cc b/runtime/vm/compiler/backend/il_x64.cc
index 94c6bee..e21744e 100644
--- a/runtime/vm/compiler/backend/il_x64.cc
+++ b/runtime/vm/compiler/backend/il_x64.cc
@@ -2780,17 +2780,21 @@
 LocationSummary* LoadFieldInstr::MakeLocationSummary(Zone* zone,
                                                      bool opt) const {
   const intptr_t kNumInputs = 1;
-  const intptr_t kNumTemps = (IsUnboxedDartFieldLoad() && opt)
-                                 ? (FLAG_precompiled_mode ? 0 : 1)
-                                 : (IsPotentialUnboxedDartFieldLoad() ? 2 : 0);
-
+  const intptr_t kNumTemps =
+      (slot().representation() != kTagged)
+          ? 0
+          : ((IsUnboxedDartFieldLoad() && opt)
+                 ? (FLAG_precompiled_mode ? 0 : 1)
+                 : (IsPotentialUnboxedDartFieldLoad() ? 2 : 0));
   const auto contains_call =
-      (IsUnboxedDartFieldLoad() && opt)
+      (slot().representation() != kTagged)
           ? LocationSummary::kNoCall
-          : (IsPotentialUnboxedDartFieldLoad()
-                 ? LocationSummary::kCallOnSlowPath
-                 : (calls_initializer() ? LocationSummary::kCall
-                                        : LocationSummary::kNoCall));
+          : ((IsUnboxedDartFieldLoad() && opt)
+                 ? LocationSummary::kNoCall
+                 : (IsPotentialUnboxedDartFieldLoad()
+                        ? LocationSummary::kCallOnSlowPath
+                        : (calls_initializer() ? LocationSummary::kCall
+                                               : LocationSummary::kNoCall)));
 
   LocationSummary* locs =
       new (zone) LocationSummary(zone, kNumInputs, kNumTemps, contains_call);
@@ -2799,8 +2803,16 @@
                                             InitInstanceFieldABI::kInstanceReg)
                                       : Location::RequiresRegister());
 
+  if (slot().representation() != kTagged) {
+    ASSERT(!calls_initializer());
+    ASSERT(RepresentationUtils::IsUnboxedInteger(slot().representation()));
+    ASSERT(RepresentationUtils::ValueSize(slot().representation()) <=
+           compiler::target::kWordSize);
+    locs->set_out(0, Location::RequiresRegister());
+  }
   if (IsUnboxedDartFieldLoad() && opt) {
     ASSERT(!calls_initializer());
+    ASSERT(!slot().field().is_non_nullable_integer());
     if (!FLAG_precompiled_mode) {
       locs->set_temp(0, Location::RequiresRegister());
     }
@@ -2826,10 +2838,25 @@
   ASSERT(sizeof(FieldLayout::is_nullable_) == 2);
 
   const Register instance_reg = locs()->in(0).reg();
+  if (slot().representation() != kTagged) {
+    const Register result = locs()->out(0).reg();
+    switch (slot().representation()) {
+      case kUnboxedInt64:
+        __ Comment("UnboxedInt64LoadFieldInstr");
+        __ movq(result, compiler::FieldAddress(instance_reg, OffsetInBytes()));
+        break;
+      case kUnboxedUint32:
+        __ Comment("UnboxedUint32LoadFieldInstr");
+        __ movl(result, compiler::FieldAddress(instance_reg, OffsetInBytes()));
+        break;
+      default:
+        UNIMPLEMENTED();
+        break;
+    }
+    return;
+  }
+
   if (IsUnboxedDartFieldLoad() && compiler->is_optimizing()) {
-    ASSERT_EQUAL(slot().representation(), kTagged);
-    ASSERT(!calls_initializer());
-    ASSERT(!slot().field().is_non_nullable_integer());
     XmmRegister result = locs()->out(0).fpu_reg();
     const intptr_t cid = slot().field().UnboxedFieldCid();
 
@@ -2881,10 +2908,8 @@
   }
 
   compiler::Label done;
-  Register result = locs()->out(0).reg();
+  const Register result = locs()->out(0).reg();
   if (IsPotentialUnboxedDartFieldLoad()) {
-    ASSERT_EQUAL(slot().representation(), kTagged);
-    ASSERT(!calls_initializer());
     Register temp = locs()->temp(1).reg();
     XmmRegister value = locs()->temp(0).fpu_reg();
 
@@ -2954,26 +2979,6 @@
     __ Bind(&load_pointer);
   }
 
-  if (slot().representation() != kTagged) {
-    ASSERT(!calls_initializer());
-    const Register result = locs()->out(0).reg();
-    const compiler::FieldAddress address(instance_reg, OffsetInBytes());
-    switch (slot().representation()) {
-      case kUnboxedInt64:
-        __ Comment("UnboxedInt64LoadFieldInstr");
-        __ movq(result, address);
-        break;
-      case kUnboxedUint32:
-        __ Comment("UnboxedUint32LoadFieldInstr");
-        __ movl(result, address);
-        break;
-      default:
-        UNIMPLEMENTED();
-        break;
-    }
-    return;
-  }
-
   __ movq(result, compiler::FieldAddress(instance_reg, OffsetInBytes()));
 
   if (calls_initializer()) {
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index 281a6b8..50cba71 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -414,6 +414,7 @@
 }
 
 void IsolateGroup::RegisterIsolateLocked(Isolate* isolate) {
+  ASSERT(isolates_lock_->IsCurrentThreadWriter());
   isolates_.Append(isolate);
   isolate_count_++;
 }
diff --git a/runtime/vm/lockers.h b/runtime/vm/lockers.h
index df163dc..04fad54 100644
--- a/runtime/vm/lockers.h
+++ b/runtime/vm/lockers.h
@@ -6,6 +6,7 @@
 #define RUNTIME_VM_LOCKERS_H_
 
 #include "platform/assert.h"
+#include "platform/growable_array.h"
 #include "vm/allocation.h"
 #include "vm/globals.h"
 #include "vm/os_thread.h"
@@ -319,6 +320,31 @@
   SafepointRwLock() {}
   ~SafepointRwLock() {}
 
+  bool IsCurrentThreadReader() {
+#if defined(DEBUG)
+    ThreadId id = OSThread::GetCurrentThreadId();
+    if (IsCurrentThreadWriter()) {
+      return true;
+    }
+    for (intptr_t i = readers_ids_.length() - 1; i >= 0; i--) {
+      if (readers_ids_.At(i) == id) {
+        return true;
+      }
+    }
+    return false;
+#else
+    UNREACHABLE();
+#endif
+  }
+
+  bool IsCurrentThreadWriter() {
+#if defined(DEBUG)
+    return writer_id_ == OSThread::GetCurrentThreadId();
+#else
+    UNREACHABLE();
+#endif
+  }
+
  private:
   friend class SafepointReadRwLocker;
   friend class SafepointWriteRwLocker;
@@ -328,11 +354,26 @@
     while (state_ == -1) {
       ml.Wait();
     }
+#if defined(DEBUG)
+    readers_ids_.Add(OSThread::GetCurrentThreadId());
+#endif
     ++state_;
   }
   void LeaveRead() {
     SafepointMonitorLocker ml(&monitor_);
     ASSERT(state_ > 0);
+#if defined(DEBUG)
+    intptr_t i = readers_ids_.length() - 1;
+    ThreadId id = OSThread::GetCurrentThreadId();
+    while (i >= 0) {
+      if (readers_ids_.At(i) == id) {
+        readers_ids_.RemoveAt(i);
+        break;
+      }
+      i--;
+    }
+    ASSERT(i >= 0);
+#endif
     if (--state_ == 0) {
       ml.NotifyAll();
     }
@@ -343,12 +384,18 @@
     while (state_ != 0) {
       ml.Wait();
     }
+#if defined(DEBUG)
+    writer_id_ = OSThread::GetCurrentThreadId();
+#endif
     state_ = -1;
   }
   void LeaveWrite() {
     SafepointMonitorLocker ml(&monitor_);
     ASSERT(state_ == -1);
     state_ = 0;
+#if defined(DEBUG)
+    writer_id_ = OSThread::kInvalidThreadId;
+#endif
     ml.NotifyAll();
   }
 
@@ -357,6 +404,11 @@
   // [state_] == 0 : The lock is free (no readers/writers).
   // [state_] == -1: The lock is held by a single writer.
   intptr_t state_ = 0;
+
+#if defined(DEBUG)
+  MallocGrowableArray<ThreadId> readers_ids_;
+  ThreadId writer_id_ = OSThread::kInvalidThreadId;
+#endif
 };
 
 /*
diff --git a/runtime/vm/thread_test.cc b/runtime/vm/thread_test.cc
index 3465d48..eb5b676 100644
--- a/runtime/vm/thread_test.cc
+++ b/runtime/vm/thread_test.cc
@@ -963,4 +963,26 @@
   }
 }
 
+#if defined(DEBUG)
+ISOLATE_UNIT_TEST_CASE(SafepointRwLockWithReadLock) {
+  SafepointRwLock lock;
+  SafepointReadRwLocker locker(Thread::Current(), &lock);
+  EXPECT(lock.IsCurrentThreadReader());
+  EXPECT(!lock.IsCurrentThreadWriter());
+}
+
+ISOLATE_UNIT_TEST_CASE(SafepointRwLockWithWriteLock) {
+  SafepointRwLock lock;
+  SafepointWriteRwLocker locker(Thread::Current(), &lock);
+  EXPECT(lock.IsCurrentThreadReader());
+  EXPECT(lock.IsCurrentThreadWriter());
+}
+
+ISOLATE_UNIT_TEST_CASE(SafepointRwLockWithoutAnyLocks) {
+  SafepointRwLock lock;
+  EXPECT(!lock.IsCurrentThreadReader());
+  EXPECT(!lock.IsCurrentThreadWriter());
+}
+#endif
+
 }  // namespace dart
diff --git a/tests/co19/co19-co19.status b/tests/co19/co19-co19.status
index 3934f21..00efb26 100644
--- a/tests/co19/co19-co19.status
+++ b/tests/co19/co19-co19.status
@@ -59,20 +59,6 @@
 LibTest/html/IFrameElement/*: Skip # Not migrated to NNBD
 LibTest/html/Node/*: Skip # Not migrated to NNBD
 LibTest/html/Window/*: Skip # Not migrated to NNBD
-LibTest/io/BytesBuilder/*: Skip # Not migrated to NNBD
-LibTest/io/CompressionOptions/*: Skip # Not migrated to NNBD
-LibTest/io/ContentType/*: Skip # Not migrated to NNBD
-LibTest/io/Cookie/*: Skip # Not migrated to NNBD
-LibTest/io/Datagram/*: Skip # Not migrated to NNBD
-LibTest/io/Directory/*: Skip # Not migrated to NNBD
-LibTest/io/File/*: Skip # Not migrated to NNBD
-LibTest/io/FileStat/*: Skip # Not migrated to NNBD
-LibTest/io/FileSystemCreateEvent/*: Skip # Not migrated to NNBD
-LibTest/io/FileSystemDeleteEvent/*: Skip # Not migrated to NNBD
-LibTest/io/FileSystemEntity/*: Skip # Not migrated to NNBD
-LibTest/io/FileSystemModifyEvent/*: Skip # Not migrated to NNBD
-LibTest/io/FileSystemMoveEvent/*: Skip # Not migrated to NNBD
-LibTest/io/GZipCodec/*: Skip # Not migrated to NNBD
 LibTest/io/HeaderValue/*: Skip # Not migrated to NNBD
 LibTest/io/HttpClient/*: Skip # Not migrated to NNBD
 LibTest/io/HttpClientBasicCredentials/*: Skip # Not migrated to NNBD
diff --git a/tests/language/nnbd/flow_analysis/never_runtime_check_nnbd.dart b/tests/language/nnbd/flow_analysis/never_runtime_check_nnbd.dart
new file mode 100644
index 0000000..78681be
--- /dev/null
+++ b/tests/language/nnbd/flow_analysis/never_runtime_check_nnbd.dart
@@ -0,0 +1,170 @@
+// Copyright (c) 2020, 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.
+
+abstract class A {
+  Never get getter;
+  Never method();
+  Never operator +(int other);
+  Never operator [](int other);
+}
+
+class C {
+  static int staticField = 0;
+
+  int instanceField;
+
+  C(this.instanceField);
+}
+
+class D extends C {
+  D(int field) : super(field);
+
+  void ifNullAssignSuper(int f()) {
+    super.instanceField ??= f(); // ignore: dead_null_aware_expression
+    // Should throw if `instanceField` returns null (rather than calling `f`).
+  }
+}
+
+class NeverField {
+  late Never n;
+
+  NeverField();
+  NeverField.initializingFormal(this.n);
+}
+
+enum Hand { left, right }
+
+late Never topLevelNever;
+
+void neverParameter(Never n) {
+  // Should throw before getting here.
+}
+
+void neverInitializingFormal(Never n) {
+  // Should throw before getting here.
+}
+
+void isPromoteToNever(int i) {
+  if (i is int) return;
+  // Should throw if `i` is null.
+}
+
+void isNotPromoteToNever(int i) {
+  if (i is! int) {
+    // Should throw if `i` is null.
+  }
+}
+
+void equalNullPromoteToNever(int f()) {
+  if (f() == null) { // ignore: unnecessary_null_comparison
+    // Should throw if `f` returns null.
+  }
+}
+
+void notEqualNullPromoteToNever(int f()) {
+  if (f() != null) return; // ignore: unnecessary_null_comparison
+  // Should throw if `f` returns null.
+}
+
+void nullEqualPromoteToNever(int f()) {
+  if (null == f()) { // ignore: unnecessary_null_comparison
+    // Should throw if `f` returns null.
+  }
+}
+
+void nullNotEqualPromoteToNever(int f()) {
+  if (null != f()) return; // ignore: unnecessary_null_comparison
+  // Should throw if `f` returns null.
+}
+
+int unnecessaryIfNull(int f(), int g()) {
+  return f() ?? g(); // ignore: dead_null_aware_expression
+  // Should throw if `f` returns null (rather than calling `g`).
+}
+
+void ifNullAssignLocal(int local, int f()) {
+  local ??= f(); // ignore: dead_null_aware_expression
+  // Should throw if `local` returns null (rather than calling `f`).
+}
+
+void ifNullAssignStatic(int f()) {
+  C.staticField ??= f(); // ignore: dead_null_aware_expression
+  // Should throw if `staticField` returns null (rather than calling `f`).
+}
+
+void ifNullAssignField(C c, int f()) {
+  c.instanceField ??= f(); // ignore: dead_null_aware_expression
+  // Should throw if `instanceField` returns null (rather than calling `f`).
+}
+
+void ifNullAssignIndex(List<int> x, int f()) {
+  x[0] ??= f(); // ignore: dead_null_aware_expression
+  // Should throw if `x[0]` returns null (rather than calling `f`).
+}
+
+void ifNullAssignSuper(D d, int f()) {
+  d.ifNullAssignSuper(f);
+}
+
+int? ifNullAssignNullAwareField(C? c, int f()) {
+  return c?.instanceField ??= f(); // ignore: dead_null_aware_expression
+  // Should throw if `instanceField` returns null (rather than calling `f`).
+}
+
+void ifNullAssignNullAwareStatic(int f()) {
+  C?.staticField ??= f(); // ignore: dead_null_aware_expression
+  // Should throw if `staticField` returns null (rather than calling `f`).
+}
+
+void unnecessaryNullAwareAccess(int f(), String error) {
+  f()?.gcd(throw error); // ignore: invalid_null_aware_operator
+  // Should throw if `f` returns null.
+}
+
+void getterReturnsNever(A a) {
+  a.getter;
+  // Should throw if `getter` completes normally.
+}
+
+void methodReturnsNever(A a) {
+  a.method();
+  // Should throw if `method` completes normally.
+}
+
+void operatorReturnsNever(A a) {
+  a + 1;
+  // Should throw if `+` completes normally.
+}
+
+void indexReturnsNever(A a) {
+  a[0];
+  // Should throw if `[]` completes normally.
+}
+
+void returnsNeverInExpression(A a) {
+  List<Never> x = [a.method()];
+  // Should throw if `method` completes normally.
+}
+
+void returnsNeverInVariable(A a) {
+  Never x = a.method();
+  // Should throw if `method` completes normally.
+}
+
+
+void switchOnBool(bool b) {
+  switch (b) {
+    case true: return;
+    case false: return;
+  }
+  // Should throw if the implicit `default` branch is taken.
+}
+
+void switchOnEnum(Hand hand) {
+  switch (hand) {
+    case Hand.left: return;
+    case Hand.right: return;
+  }
+  // Should throw if the implicit `default` branch is taken.
+}
\ No newline at end of file
diff --git a/tests/language/nnbd/flow_analysis/never_runtime_check_test.dart b/tests/language/nnbd/flow_analysis/never_runtime_check_test.dart
new file mode 100644
index 0000000..c50d3a4
--- /dev/null
+++ b/tests/language/nnbd/flow_analysis/never_runtime_check_test.dart
@@ -0,0 +1,143 @@
+// Copyright (c) 2020, 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.
+
+// @dart=2.7
+
+// Requirements=nnbd-weak
+
+// Validates that mixed-mode programs have runtime checks to ensure that code
+// that should be unreachable is not executed even when a legacy types causes
+// the unreachable code to be reached.
+
+import 'package:expect/expect.dart';
+
+import 'never_runtime_check_nnbd.dart';
+
+class AImpl implements A {
+  Never get getter => null;
+  Never method() => null;
+  Never operator +(int other) => null;
+  Never operator [](int other) => null;
+}
+
+main() {
+  Expect.throws(() {
+    neverParameter(null);
+  });
+
+  Expect.throws(() {
+    NeverField().n = null;
+  });
+
+  Expect.throws(() {
+    // Write.
+    topLevelNever = null;
+  });
+
+  Expect.throws(() {
+    // Read.
+    topLevelNever;
+  });
+
+  Expect.throws(() {
+    NeverField.initializingFormal(null);
+  });
+
+  Expect.throws(() {
+    isPromoteToNever(null);
+  });
+
+  Expect.throws(() {
+    isNotPromoteToNever(null);
+  });
+
+  Expect.throws(() {
+    equalNullPromoteToNever(() => null);
+  });
+
+  Expect.throws(() {
+    notEqualNullPromoteToNever(() => null);
+  });
+
+  Expect.throws(() {
+    nullEqualPromoteToNever(() => null);
+  });
+
+  Expect.throws(() {
+    nullNotEqualPromoteToNever(() => null);
+  });
+
+  Expect.throws(() {
+    unnecessaryIfNull(() => null, () => throw "should not reach");
+  }, (error) => error != "should not reach");
+
+  Expect.throws(() {
+    ifNullAssignLocal(null, () => throw "should not reach");
+  }, (error) => error != "should not reach");
+
+  C.staticField = null;
+  Expect.throws(() {
+    ifNullAssignStatic(() => throw "should not reach");
+  }, (error) => error != "should not reach");
+
+  Expect.throws(() {
+    ifNullAssignField(C(null), () => throw "should not reach");
+  }, (error) => error != "should not reach");
+
+  Expect.throws(() {
+    ifNullAssignIndex(<int>[null], () => throw "should not reach");
+  }, (error) => error != "should not reach");
+
+  Expect.throws(() {
+    ifNullAssignSuper(D(null), () => throw "should not reach");
+  }, (error) => error != "should not reach");
+
+  Expect.throws(() {
+    ifNullAssignNullAwareField(C(null), () => throw "should not reach");
+  }, (error) => error != "should not reach");
+
+  Expect.equals(
+      ifNullAssignNullAwareField(null, () => throw "should not reach"), null);
+
+  C.staticField = null;
+  Expect.throws(() {
+    ifNullAssignNullAwareStatic(() => throw "should not reach");
+  }, (error) => error != "should not reach");
+
+  Expect.throws(() {
+    unnecessaryNullAwareAccess(() => null, "should not reach");
+  }, (error) => error != "should not reach");
+
+  Expect.throws(() {
+    getterReturnsNever(AImpl());
+  });
+
+  Expect.throws(() {
+    methodReturnsNever(AImpl());
+  });
+
+  Expect.throws(() {
+    operatorReturnsNever(AImpl());
+  });
+
+  Expect.throws(() {
+    indexReturnsNever(AImpl());
+  });
+
+  Expect.throws(() {
+    returnsNeverInExpression(AImpl());
+  });
+
+  Expect.throws(() {
+    returnsNeverInVariable(AImpl());
+  });
+
+  Expect.throws(() {
+    switchOnBool(null);
+  });
+
+  Expect.throws(() {
+    switchOnEnum(null);
+  });
+}
diff --git a/tests/language/super/conditional_operator_test.dart b/tests/language/super/conditional_operator_test.dart
index 1c47348..f60af6b 100644
--- a/tests/language/super/conditional_operator_test.dart
+++ b/tests/language/super/conditional_operator_test.dart
@@ -24,118 +24,84 @@
   test() {
     super?.field = 1;
     //   ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //   ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     super?.field += 1;
     //   ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //   ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     super?.field ??= 1;
     //   ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //   ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     //               ^
     // [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION
     super?.field;
     //   ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //   ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     1 * super?.field;
     //  ^^^^^^^^^^^^
     // [analyzer] COMPILE_TIME_ERROR.ARGUMENT_TYPE_NOT_ASSIGNABLE
     //       ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //       ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     -super?.field;
     //    ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //    ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     ~super?.field;
     //    ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //    ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     !super?.field;
 //   ^^^^^^^^^^^^
 // [analyzer] COMPILE_TIME_ERROR.NON_BOOL_NEGATION_EXPRESSION
 //        ^^
-// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-// [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-//        ^^
 // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+// [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
 //          ^
 // [cfe] A value of type 'int' can't be assigned to a variable of type 'bool'.
     --super?.field;
     //     ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //     ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     ++super?.field;
     //     ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //     ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     super?.method();
     //   ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //   ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     1 * super?.method();
     //       ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //       ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     -super?.method();
     //    ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //    ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     ~super?.method();
     //    ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //    ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     !super?.method();
     //    ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //    ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     --super?.method();
     //     ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //     ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     //       ^
     // [cfe] Can't assign to this.
     //              ^
     // [analyzer] SYNTACTIC_ERROR.MISSING_ASSIGNABLE_SELECTOR
     ++super?.method();
     //     ^^
-    // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
-    //     ^^
     // [analyzer] SYNTACTIC_ERROR.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
+    // [cfe] The operator '?.' cannot be used with 'super' because 'super' cannot be null.
     //       ^
     // [cfe] Can't assign to this.
     //              ^
diff --git a/tools/VERSION b/tools/VERSION
index befae4f..beac601 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
 MAJOR 2
 MINOR 10
 PATCH 0
-PRERELEASE 57
+PRERELEASE 58
 PRERELEASE_PATCH 0
\ No newline at end of file
diff --git a/tools/bots/flutter/analyze_flutter_engine.sh b/tools/bots/flutter/analyze_flutter_engine.sh
new file mode 100755
index 0000000..bdf8244
--- /dev/null
+++ b/tools/bots/flutter/analyze_flutter_engine.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# Copyright (c) 2020, 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.
+
+# Analyze Dart code in the flutter/engine repo.
+
+set -e
+
+checkout=$(pwd)
+dart=$checkout/out/ReleaseX64/dart-sdk/bin/dart
+sdk=$checkout/out/ReleaseX64/dart-sdk
+tmpdir=$(mktemp -d)
+cleanup() {
+  rm -rf "$tmpdir"
+}
+trap cleanup EXIT HUP INT QUIT TERM PIPE
+cd "$tmpdir"
+
+git clone --single-branch -vv \
+  https://dart.googlesource.com/external/github.com/flutter/engine
+
+cd engine
+
+# analyze lib/web_ui
+echo Analyzing lib/web_ui...
+pushd lib/web_ui
+$dart pub get
+$dart analyze
+popd
diff --git a/tools/bots/flutter/analyze_flutter.sh b/tools/bots/flutter/analyze_flutter_flutter.sh
similarity index 92%
rename from tools/bots/flutter/analyze_flutter.sh
rename to tools/bots/flutter/analyze_flutter_flutter.sh
index 8ed110c..e639f93 100755
--- a/tools/bots/flutter/analyze_flutter.sh
+++ b/tools/bots/flutter/analyze_flutter_flutter.sh
@@ -3,7 +3,8 @@
 # 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.
 
-# Runs flutter's analyzer related tests with a locally built SDK.
+# Analyze Dart code in the flutter/flutter repo.
+
 set -e
 
 checkout=$(pwd)
diff --git a/tools/bots/test_matrix.json b/tools/bots/test_matrix.json
index 41dbd25..393c28b 100644
--- a/tools/bots/test_matrix.json
+++ b/tools/bots/test_matrix.json
@@ -3414,8 +3414,12 @@
           ]
         },
         {
-          "name": "analyze flutter",
-          "script": "tools/bots/flutter/analyze_flutter.sh"
+          "name": "analyze flutter/engine",
+          "script": "tools/bots/flutter/analyze_flutter_engine.sh"
+        },
+        {
+          "name": "analyze flutter/flutter",
+          "script": "tools/bots/flutter/analyze_flutter_flutter.sh"
         }
       ]
     },
diff --git a/tools/bots/update_flakiness.dart b/tools/bots/update_flakiness.dart
index 71bf402..2f4f680 100755
--- a/tools/bots/update_flakiness.dart
+++ b/tools/bots/update_flakiness.dart
@@ -12,105 +12,90 @@
 
 import 'package:test_runner/bot_results.dart';
 
-main(List<String> args) async {
-  final parser = new ArgParser();
+void main(List<String> args) async {
+  final parser = ArgParser();
   parser.addFlag('help', help: 'Show the program usage.', negatable: false);
-  parser.addOption('input', abbr: 'i', help: "Input flakiness file.");
-  parser.addOption('output', abbr: 'o', help: "Output flakiness file.");
-  parser.addOption('build-id', help: "Logdog ID of this buildbot run");
-  parser.addOption('commit', help: "Commit hash of this buildbot run");
+  parser.addOption('input', abbr: 'i', help: 'Input flakiness file.');
+  parser.addOption('output', abbr: 'o', help: 'Output flakiness file.');
+  parser.addOption('build-id', help: 'Logdog ID of this buildbot run');
+  parser.addOption('commit', help: 'Commit hash of this buildbot run');
+  parser.addFlag('no-forgive', help: 'Don\'t remove any flaky records');
 
   final options = parser.parse(args);
-  if (options["help"]) {
-    print("""
+  if (options['help']) {
+    print('''
 Usage: update_flakiness.dart [OPTION]... [RESULT-FILE]...
 Update the flakiness data with a set of fresh results.
 
 The options are as follows:
 
-${parser.usage}""");
+${parser.usage}''');
     return;
   }
   final parameters = options.rest;
 
   // Load the existing flakiness data, if any.
-  final data = options["input"] != null
-      ? await loadResultsMap(options["input"])
+  final data = options['input'] != null
+      ? await loadResultsMap(options['input'])
       : <String, Map<String, dynamic>>{};
 
   // Incrementally update the flakiness data with each observed result.
   for (final path in parameters) {
     final results = await loadResults(path);
     for (final resultObject in results) {
-      final String configuration = resultObject["configuration"];
-      final String name = resultObject["name"];
-      final String result = resultObject["result"];
-      final key = "$configuration:$name";
-      newMap() => <String, dynamic>{};
-      final Map<String, dynamic> testData = data.putIfAbsent(key, newMap);
-      testData["configuration"] = configuration;
-      testData["name"] = name;
-      testData["expected"] = resultObject["expected"];
-      final outcomes = testData.putIfAbsent("outcomes", () => []);
+      final String configuration = resultObject['configuration'];
+      final String name = resultObject['name'];
+      final String result = resultObject['result'];
+      final key = '$configuration:$name';
+      Map<String, dynamic> newMap() => {};
+      final testData = data.putIfAbsent(key, newMap);
+      testData['configuration'] = configuration;
+      testData['name'] = name;
+      testData['expected'] = resultObject['expected'];
+      final outcomes = testData.putIfAbsent('outcomes', () => []);
       final time = DateTime.now().toIso8601String();
       if (!outcomes.contains(result)) {
         outcomes
           ..add(result)
           ..sort();
-        testData["last_new_result_seen"] = time;
+        testData['last_new_result_seen'] = time;
       }
-      if (testData["current"] == result) {
-        testData["current_counter"]++;
+      if (testData['current'] == result) {
+        testData['current_counter']++;
       } else {
-        testData["current"] = result;
-        testData["current_counter"] = 1;
+        testData['current'] = result;
+        testData['current_counter'] = 1;
       }
-      final occurrences = testData.putIfAbsent("occurrences", newMap);
+      final occurrences = testData.putIfAbsent('occurrences', newMap);
       occurrences.putIfAbsent(result, () => 0);
       occurrences[result]++;
-      final firstSeen = testData.putIfAbsent("first_seen", newMap);
+      final firstSeen = testData.putIfAbsent('first_seen', newMap);
       firstSeen.putIfAbsent(result, () => time);
-      final lastSeen = testData.putIfAbsent("last_seen", newMap);
+      final lastSeen = testData.putIfAbsent('last_seen', newMap);
       lastSeen[result] = time;
-      final matches = testData.putIfAbsent("matches", newMap);
-      // TODO: Temporarily fill in the matches field for all other outcomes.
-      // Remove this when all the builders have run at least once.
-      for (final outcome in occurrences.keys) {
-        matches[outcome] = resultObject["expected"] == "Fail"
-            ? ["Fail", "CompileTimeError", "RuntimeError"].contains(outcome)
-            : resultObject["expected"] == outcome;
-      }
-      matches[result] = resultObject["matches"];
+      final matches = testData.putIfAbsent('matches', newMap);
+      matches[result] = resultObject['matches'];
 
-      if (options["build-id"] != null) {
-        final buildIds = testData.putIfAbsent("build_ids", newMap);
-        buildIds[result] = options["build-id"];
+      if (options['build-id'] != null) {
+        final buildIds = testData.putIfAbsent('build_ids', newMap);
+        buildIds[result] = options['build-id'];
       }
-      if (options["commit"] != null) {
-        final commits = testData.putIfAbsent("commits", newMap);
-        commits[result] = options["commit"];
+      if (options['commit'] != null) {
+        final commits = testData.putIfAbsent('commits', newMap);
+        commits[result] = options['commit'];
       }
     }
   }
 
-  // Write out the new flakiness data, containing all the tests known to have
-  // multiple outcomes.
-  final sink = options["output"] != null
-      ? new File(options["output"]).openWrite()
-      : stdout;
-  final keys = new List<String>.from(data.keys)..sort();
+  // Write out the new flakiness data.
+  final sink =
+      options['output'] != null ? File(options['output']).openWrite() : stdout;
+  final keys = data.keys.toList()..sort();
   for (final key in keys) {
     final testData = data[key];
-    if (testData["outcomes"].length < 2) continue;
-    // TODO: Temporarily discard entries for old tests that don't run. Remove
-    // this when all the builders have run at least once.
-    if (!testData.containsKey("matches")) {
-      continue;
-    }
-    // Forgive tests that have become deterministic again. If they flake less
-    // than once in a 100 (p<1%), then if they flake again, the probability of
-    // them getting past 5 runs of deflaking is 1%^5 = 0.00000001%.
-    if (100 <= testData["current_counter"]) {
+    if (testData['outcomes'].length < 2) continue;
+    // Forgive tests that have been stable for 100 builds.
+    if (!options['no-forgive'] && testData['current_counter'] >= 100) {
       continue;
     }
     sink.writeln(jsonEncode(testData));
diff --git a/tools/experimental_features.yaml b/tools/experimental_features.yaml
index bc31403..012ec64 100644
--- a/tools/experimental_features.yaml
+++ b/tools/experimental_features.yaml
@@ -56,6 +56,14 @@
 # guarded by the flag.  Users can enable the flag and begin to try out
 # the feature as it is being developed.
 #
+# Experimental release:
+#    When an experiment is released, then the 'experimentalReleaseVersion' field
+# is added indicating which version of the SDK contains this new language
+# feature for libraries and packages in mentioned in
+# `sdk/lib/_internal/allowed_experiments.json`. For other libraries and
+# packages, passing the experiment flag is still required to turn on the
+# experiment.
+#
 # Shipped:
 #    When an experiment is shipped, then the 'enabledIn' field is added
 # indicating which version of the SDK contains this new language feature.