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 e624930..c39a398 100644
--- a/pkg/front_end/lib/src/api_prototype/compiler_options.dart
+++ b/pkg/front_end/lib/src/api_prototype/compiler_options.dart
@@ -94,8 +94,8 @@
   /// program.
   ///
   /// The components provided here should be closed and acyclic: any libraries
-  /// that they reference should be defined in a component in [linkedDependencies]
-  /// or any of the [inputSummaries] or [sdkSummary].
+  /// that they reference should be defined in a component in
+  /// [linkedDependencies] or any of the [inputSummaries] or [sdkSummary].
   List<Uri> linkedDependencies = [];
 
   /// URI of the SDK summary file (typically a "file:" URI).
@@ -175,8 +175,8 @@
   // verbose data (Issue #30056)
   bool verbose = false;
 
-  /// Whether to run extra verification steps to validate that compiled components
-  /// are well formed.
+  /// Whether to run extra verification steps to validate that compiled
+  /// components are well formed.
   ///
   /// Errors are reported via the [onError] callback.
   // TODO(sigmund): ensure we don't print errors to stdout (Issue #30056)
diff --git a/pkg/front_end/lib/src/base/errors.dart b/pkg/front_end/lib/src/base/errors.dart
index 7699dd1..1f01f89 100644
--- a/pkg/front_end/lib/src/base/errors.dart
+++ b/pkg/front_end/lib/src/base/errors.dart
@@ -83,8 +83,8 @@
   static const ErrorSeverity INFO = const ErrorSeverity('INFO', 1, "I", "info");
 
   /**
-   * The severity representing a warning. Warnings can become errors if the `-Werror` command
-   * line flag is specified.
+   * The severity representing a warning. Warnings can become errors if the
+   * `-Werror` command line flag is specified.
    */
   static const ErrorSeverity WARNING =
       const ErrorSeverity('WARNING', 2, "W", "warning");
diff --git a/pkg/front_end/lib/src/base/processed_options.dart b/pkg/front_end/lib/src/base/processed_options.dart
index c3072d9..08b6057 100644
--- a/pkg/front_end/lib/src/base/processed_options.dart
+++ b/pkg/front_end/lib/src/base/processed_options.dart
@@ -104,18 +104,18 @@
 
   /// The SDK summary, or `null` if it has not been read yet.
   ///
-  /// A summary, also referred to as "outline" internally, is a [Component] where
-  /// all method bodies are left out. In essence, it contains just API
-  /// signatures and constants. When strong-mode is enabled, the summary already
-  /// includes inferred types.
+  /// A summary, also referred to as "outline" internally, is a [Component]
+  /// where all method bodies are left out. In essence, it contains just API
+  /// signatures and constants. When strong-mode is enabled, the summary
+  /// already includes inferred types.
   Component _sdkSummaryComponent;
 
   /// The summary for each uri in `options.inputSummaries`.
   ///
-  /// A summary, also referred to as "outline" internally, is a [Component] where
-  /// all method bodies are left out. In essence, it contains just API
-  /// signatures and constants. When strong-mode is enabled, the summary already
-  /// includes inferred types.
+  /// A summary, also referred to as "outline" internally, is a [Component]
+  /// where all method bodies are left out. In essence, it contains just API
+  /// signatures and constants. When strong-mode is enabled, the summary
+  /// already includes inferred types.
   List<Component> _inputSummariesComponents;
 
   /// Other components that are meant to be linked and compiled with the input
diff --git a/pkg/front_end/lib/src/base/source.dart b/pkg/front_end/lib/src/base/source.dart
index a87f933..d3d0884 100644
--- a/pkg/front_end/lib/src/base/source.dart
+++ b/pkg/front_end/lib/src/base/source.dart
@@ -34,24 +34,28 @@
 }
 
 /**
- * The interface `Source` defines the behavior of objects representing source code that can be
- * analyzed by the analysis engine.
+ * The interface `Source` defines the behavior of objects representing source
+ * code that can be analyzed by the analysis engine.
  *
- * Implementations of this interface need to be aware of some assumptions made by the analysis
- * engine concerning sources:
- * * Sources are not required to be unique. That is, there can be multiple instances representing
- * the same source.
- * * Sources are long lived. That is, the engine is allowed to hold on to a source for an extended
- * period of time and that source must continue to report accurate and up-to-date information.
- * Because of these assumptions, most implementations will not maintain any state but will delegate
- * to an authoritative system of record in order to implement this API. For example, a source that
- * represents files on disk would typically query the file system to determine the state of the
- * file.
+ * Implementations of this interface need to be aware of some assumptions made
+ * by the analysis engine concerning sources:
  *
- * If the instances that implement this API are the system of record, then they will typically be
- * unique. In that case, sources that are created that represent non-existent files must also be
- * retained so that if those files are created at a later date the long-lived sources representing
- * those files will know that they now exist.
+ * * Sources are not required to be unique. That is, there can be multiple
+ * instances representing the same source.
+ * * Sources are long lived. That is, the engine is allowed to hold on to a
+ * source for an extended period of time and that source must continue to
+ * report accurate and up-to-date information.
+ *
+ * Because of these assumptions, most implementations will not maintain any
+ * state but will delegate to an authoritative system of record in order to
+ * implement this API. For example, a source that represents files on disk
+ * would typically query the file system to determine the state of the file.
+ *
+ * If the instances that implement this API are the system of record, then they
+ * will typically be unique. In that case, sources that are created that
+ * represent non-existent files must also be retained so that if those files
+ * are created at a later date the long-lived sources representing those files
+ * will know that they now exist.
  */
 abstract class Source implements AnalysisTarget {
   /**
@@ -63,8 +67,8 @@
    * Get the contents and timestamp of this source.
    *
    * Clients should consider using the method [AnalysisContext.getContents]
-   * because contexts can have local overrides of the content of a source that the source is not
-   * aware of.
+   * because contexts can have local overrides of the content of a source that
+   * the source is not aware of.
    *
    * @return the contents and timestamp of the source
    * @throws Exception if the contents of this source could not be accessed
@@ -72,8 +76,8 @@
   TimestampedData<String> get contents;
 
   /**
-   * Return an encoded representation of this source that can be used to create a source that is
-   * equal to this source.
+   * Return an encoded representation of this source that can be used to create
+   * a source that is equal to this source.
    *
    * @return an encoded representation of this source
    * See [SourceFactory.fromEncoding].
@@ -81,9 +85,9 @@
   String get encoding;
 
   /**
-   * Return the full (long) version of the name that can be displayed to the user to denote this
-   * source. For example, for a source representing a file this would typically be the absolute path
-   * of the file.
+   * Return the full (long) version of the name that can be displayed to the
+   * user to denote this source. For example, for a source representing a file
+   * this would typically be the absolute path of the file.
    *
    * @return a name that can be displayed to the user to denote this source
    */
@@ -112,9 +116,10 @@
    * Return the modification stamp for this source, or a negative value if the
    * source does not exist. A modification stamp is a non-negative integer with
    * the property that if the contents of the source have not been modified
-   * since the last time the modification stamp was accessed then the same value
-   * will be returned, but if the contents of the source have been modified one
-   * or more times (even if the net change is zero) the stamps will be different.
+   * since the last time the modification stamp was accessed then the same
+   * value will be returned, but if the contents of the source have been
+   * modified one or more times (even if the net change is zero) the stamps
+   * will be different.
    *
    * Clients should consider using the method
    * [AnalysisContext.getModificationStamp] because contexts can have local
@@ -123,8 +128,9 @@
   int get modificationStamp;
 
   /**
-   * Return a short version of the name that can be displayed to the user to denote this source. For
-   * example, for a source representing a file this would typically be the name of the file.
+   * Return a short version of the name that can be displayed to the user to
+   * denote this source. For example, for a source representing a file this
+   * would typically be the name of the file.
    *
    * @return a name that can be displayed to the user to denote this source
    */
@@ -141,22 +147,23 @@
   Uri get uri;
 
   /**
-   * Return the kind of URI from which this source was originally derived. If this source was
-   * created from an absolute URI, then the returned kind will reflect the scheme of the absolute
-   * URI. If it was created from a relative URI, then the returned kind will be the same as the kind
-   * of the source against which the relative URI was resolved.
+   * Return the kind of URI from which this source was originally derived. If
+   * this source was created from an absolute URI, then the returned kind will
+   * reflect the scheme of the absolute URI. If it was created from a relative
+   * URI, then the returned kind will be the same as the kind of the source
+   * against which the relative URI was resolved.
    *
    * @return the kind of URI from which this source was originally derived
    */
   UriKind get uriKind;
 
   /**
-   * Return `true` if the given object is a source that represents the same source code as
-   * this source.
+   * Return `true` if the given object is a source that represents the same
+   * source code as this source.
    *
    * @param object the object to be compared with this object
-   * @return `true` if the given object is a source that represents the same source code as
-   *         this source
+   * @return `true` if the given object is a source that represents the same
+   *         source code as this source
    * See [Object.==].
    */
   @override
@@ -166,8 +173,9 @@
    * Return `true` if this source exists.
    *
    * Clients should consider using the method [AnalysisContext.exists] because
-   * contexts can have local overrides of the content of a source that the source is not aware of
-   * and a source with local content is considered to exist even if there is no file on disk.
+   * contexts can have local overrides of the content of a source that the
+   * source is not aware of and a source with local content is considered to
+   * exist even if there is no file on disk.
    *
    * @return `true` if this source exists
    */
diff --git a/pkg/front_end/lib/src/base/uri_kind.dart b/pkg/front_end/lib/src/base/uri_kind.dart
index 0e6d007..e098992 100644
--- a/pkg/front_end/lib/src/base/uri_kind.dart
+++ b/pkg/front_end/lib/src/base/uri_kind.dart
@@ -3,8 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /**
- * The enumeration `UriKind` defines the different kinds of URI's that are known to the
- * analysis engine. These are used to keep track of the kind of URI associated with a given source.
+ * The enumeration `UriKind` defines the different kinds of URI's that are
+ * known to the analysis engine. These are used to keep track of the kind of
+ * URI associated with a given source.
  */
 class UriKind implements Comparable<UriKind> {
   /**
diff --git a/pkg/front_end/lib/src/codegen/tools.dart b/pkg/front_end/lib/src/codegen/tools.dart
index cda0e11..02a4050 100644
--- a/pkg/front_end/lib/src/codegen/tools.dart
+++ b/pkg/front_end/lib/src/codegen/tools.dart
@@ -60,8 +60,8 @@
     for (GeneratedContent target in targets) {
       bool ok = await target.check(pkgPath);
       if (!ok) {
-        print(
-            '${target.output(pkgPath).absolute} does not have expected contents.');
+        print("${target.output(pkgPath).absolute}"
+            " doesn't have expected contents.");
         generateNeeded = true;
       }
     }
diff --git a/pkg/front_end/lib/src/fasta/target.dart b/pkg/front_end/lib/src/fasta/target.dart
index 30b3754..ecf29f9 100644
--- a/pkg/front_end/lib/src/fasta/target.dart
+++ b/pkg/front_end/lib/src/fasta/target.dart
@@ -12,8 +12,8 @@
 /// A compilation target.
 ///
 /// A target reads source files with [read], builds outlines when
-/// [buildOutlines] is called and builds the full component when [buildComponent]
-/// is called.
+/// [buildOutlines] is called and builds the full component when
+/// [buildComponent] is called.
 abstract class Target {
   final Ticker ticker;
 
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_constraint_gatherer.dart b/pkg/front_end/lib/src/fasta/type_inference/type_constraint_gatherer.dart
index a6f0aee..0b8d427 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_constraint_gatherer.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_constraint_gatherer.dart
@@ -227,10 +227,10 @@
       var subtypeArg = subtype.typeArguments[0];
       if (supertype is InterfaceType &&
           identical(supertype.classNode, environment.futureOrClass)) {
-        // `FutureOr<P>` is a subtype match for `FutureOr<Q>` with respect to `L`
-        // under constraints `C`:
-        // - If `P` is a subtype match for `Q` with respect to `L` under constraints
-        //   `C`.
+        // `FutureOr<P>` is a subtype match for `FutureOr<Q>` with respect to
+        // `L` under constraints `C`:
+        // - If `P` is a subtype match for `Q` with respect to `L` under
+        //   constraints `C`.
         var supertypeArg = supertype.typeArguments[0];
         return _isSubtypeMatch(subtypeArg, supertypeArg);
       }
@@ -252,8 +252,8 @@
       // constraints `C`:
       // - If `P` is a subtype match for `Future<Q>` with respect to `L` under
       //   constraints `C`.
-      // - Or `P` is not a subtype match for `Future<Q>` with respect to `L` under
-      //   constraints `C`
+      // - Or `P` is not a subtype match for `Future<Q>` with respect to `L`
+      //   under constraints `C`
       //   - And `P` is a subtype match for `Q` with respect to `L` under
       //     constraints `C`
       var supertypeArg = supertype.typeArguments[0];
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart b/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
index e1cb6ea..49c6214 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
@@ -235,8 +235,8 @@
   /// corresponding fields.
   void finishTopLevelInitializingFormals();
 
-  /// Gets ready to do top level type inference for the component having the given
-  /// [hierarchy], using the given [coreTypes].
+  /// Gets ready to do top level type inference for the component having the
+  /// given [hierarchy], using the given [coreTypes].
   void prepareTopLevel(CoreTypes coreTypes, ClassHierarchy hierarchy);
 
   /// Records that the given initializing [formal] will need top level type
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_promotion.dart b/pkg/front_end/lib/src/fasta/type_inference/type_promotion.dart
index fa4b1ea..0665ed5 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_promotion.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_promotion.dart
@@ -483,16 +483,16 @@
 /// represents all facts that are known to hold at a certain point in the
 /// component.
 ///
-/// The fact is said to "apply" to a given point in the execution of the component
-/// if the fact is part of the current fact state at the point the parser
-/// reaches that point in the component.
+/// The fact is said to "apply" to a given point in the execution of the
+/// component if the fact is part of the current fact state at the point the
+/// parser reaches that point in the component.
 ///
-/// Note: just because a fact "applies" to a given point in the execution of the
-/// component doesn't mean a type will be promoted--it simply means that the fact
-/// was deduced at a previous point in the straight line execution of the code.
-/// It's possible that the fact will be overshadowed by a later fact, or its
-/// effect will be cancelled by a later assignment.  The final detemination of
-/// whether promotion occurs is left to [_computePromotedType].
+/// Note: just because a fact "applies" to a given point in the execution of
+/// the component doesn't mean a type will be promoted--it simply means that
+/// the fact was deduced at a previous point in the straight line execution of
+/// the code.  It's possible that the fact will be overshadowed by a later
+/// fact, or its effect will be cancelled by a later assignment.  The final
+/// detemination of whether promotion occurs is left to [_computePromotedType].
 abstract class TypePromotionFact {
   /// The variable this fact records information about, or `null` if this fact
   /// records information about general flow control.
diff --git a/pkg/front_end/lib/src/scanner/errors.dart b/pkg/front_end/lib/src/scanner/errors.dart
index 454163c..6d3fb51 100644
--- a/pkg/front_end/lib/src/scanner/errors.dart
+++ b/pkg/front_end/lib/src/scanner/errors.dart
@@ -49,7 +49,8 @@
       const ScannerErrorCode(
           'UNTERMINATED_MULTI_LINE_COMMENT', "Unterminated multi-line comment.",
           correction: "Try terminating the comment with '*/', or "
-              "removing any unbalanced occurances of '/*' (because comments nest in Dart).");
+              "removing any unbalanced occurances of '/*'"
+              " (because comments nest in Dart).");
 
   static const ScannerErrorCode UNTERMINATED_STRING_LITERAL =
       const ScannerErrorCode(
diff --git a/pkg/front_end/test/fasta/parser/type_info_test.dart b/pkg/front_end/test/fasta/parser/type_info_test.dart
index d2d53a5..f208149 100644
--- a/pkg/front_end/test/fasta/parser/type_info_test.dart
+++ b/pkg/front_end/test/fasta/parser/type_info_test.dart
@@ -333,7 +333,8 @@
       'handleType int )',
       'handleNoName )',
       'handleFormalParameterWithoutValue )',
-      'beginTypeVariables null null ) FormalParameterKind.mandatory MemberKind.GeneralizedFunctionType',
+      'beginTypeVariables null null ) FormalParameterKind.mandatory'
+          ' MemberKind.GeneralizedFunctionType',
       'endFormalParameters 1 ( ) MemberKind.GeneralizedFunctionType',
       'endFunctionType Function m',
     ]);
diff --git a/pkg/front_end/tool/_fasta/compile_platform.dart b/pkg/front_end/tool/_fasta/compile_platform.dart
index 52afecd..1b47a33 100644
--- a/pkg/front_end/tool/_fasta/compile_platform.dart
+++ b/pkg/front_end/tool/_fasta/compile_platform.dart
@@ -114,7 +114,8 @@
     //
     // It's broken if it says something like this:
     //
-    //     ninja explain: expected depfile 'vm_platform.dill.d' to mention 'vm_platform.dill', got '/.../xcodebuild/ReleaseX64/vm_platform.dill'
+    //     ninja explain: expected depfile 'vm_platform.dill.d' to mention \
+    //     'vm_platform.dill', got '/.../xcodebuild/ReleaseX64/vm_platform.dill'
     return Uri.parse(relativizeUri(uri, base: Uri.base)).toFilePath();
   }
 
diff --git a/pkg/front_end/tool/_fasta/dump_partial.dart b/pkg/front_end/tool/_fasta/dump_partial.dart
index 610fdb7..9f8bef0 100644
--- a/pkg/front_end/tool/_fasta/dump_partial.dart
+++ b/pkg/front_end/tool/_fasta/dump_partial.dart
@@ -20,8 +20,9 @@
   writeComponentToText(component);
 }
 
-/// Creates a component that contains all of the context code marked as external,
-/// and all libraries defined in partial.dill as they are written in that file.
+/// Creates a component that contains all of the context code marked as
+/// external, and all libraries defined in partial.dill as they are written in
+/// that file.
 Component _loadComponent(List<String> args) {
   List<int> partialInput = new File(args[0]).readAsBytesSync();