[kernel,front_end] Migrate first wave of pkg/kernel and pkg/front_end

Migrates libraries dependent only on already migrated libraries. Change-Id: I0e85ee8dbc2afce031b92e0009e71c206a55af28 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/179502 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Jens Johansen <jensj@google.com>
2021-01-18 15:40:21 +00:00
parent 04e8aa58ee
commit 34fb48bb8a
484 changed files with 1084 additions and 42 deletions
@@ -1,6 +1,6 @@
 {
  "copyright": [
-    "Copyright (c) 2020, the Dart project authors. Please see the AUTHORS ",
+    "Copyright (c) 2021, 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."
  ],
@@ -11,7 +11,7 @@
    "constraint, update this by running tools/generate_package_config.dart."
  ],
  "configVersion": 2,
-  "generated": "2020-12-16T11:30:30.799202",
+  "generated": "2021-01-16T20:34:15.774260",
  "generator": "tools/generate_package_config.dart",
  "packages": [
    {
@@ -273,7 +273,7 @@
      "name": "front_end",
      "rootUri": "../pkg/front_end",
      "packageUri": "lib/",
-      "languageVersion": "2.6"
+      "languageVersion": "2.12"
    },
    {
      "name": "front_end_testcases",
@@ -367,7 +367,7 @@
      "name": "kernel",
      "rootUri": "../pkg/kernel",
      "packageUri": "lib/",
-      "languageVersion": "2.6"
+      "languageVersion": "2.12"
    },
    {
      "name": "language_versioning_2.7_test",
@@ -1,4 +1,4 @@
-// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2021, 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.

@@ -2,6 +2,8 @@
 // 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.

+// @dart=2.9
+
 import 'package:compiler/src/dart2js.dart' as dart2js;

 main(args) => dart2js.main(args);
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library front_end.compiler_options;

 import 'package:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library front_end.constant_evaluator;

 export '../fasta/kernel/constant_evaluator.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:kernel/kernel.dart' show Version;

 part 'experimental_flags_generated.dart';
@@ -1,7 +1,9 @@
-// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2021, 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
+
 // NOTE: THIS FILE IS GENERATED. DO NOT EDIT.
 //
 // Instead modify 'tools/experimental_features.yaml' and run
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// The Dart Front End contains logic to build summaries and kernel programs
 /// from Dart sources. The APIs exposed here are designed for tools in the Dart
 /// ecosystem that need to load sources and convert them to these formats.
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:_fe_analyzer_shared/src/scanner/string_scanner.dart'
    show StringScanner;

@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// Defines the front-end API for converting source code to Dart Kernel objects.
 library front_end.kernel_generator;

@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:typed_data' show Uint8List;

 import 'package:_fe_analyzer_shared/src/scanner/scanner.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:kernel/ast.dart';
 import '../fasta/kernel/late_lowering.dart';
 import '../fasta/source/source_extension_builder.dart' show extensionThisName;
@@ -87,7 +87,7 @@ class MemoryFileSystemEntity implements FileSystemEntity {

  @override
  Future<List<int>> readAsBytes() async {
-    Uint8List contents = _fileSystem._files[uri];
+    Uint8List? contents = _fileSystem._files[uri];
    if (contents == null) {
      throw new FileSystemException(uri, 'File $uri does not exist.');
    }
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library front_end.standard_file_system;

 import 'dart:io' as io;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// Defines the front-end API for converting source code to summaries.
 library front_end.summary_generator;

@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// API needed by `utils/front_end/summary_worker.dart`, a tool used to compute
 /// summaries in build systems like bazel, pub-build, and package-build.

@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import '../api_prototype/compiler_options.dart' show CompilerOptions;

 import '../base/processed_options.dart' show ProcessedOptions;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:_fe_analyzer_shared/src/messages/codes.dart'
    show messageMissingMain;

@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
    show DiagnosticMessageHandler;

@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:kernel/kernel.dart' show Component, CanonicalName, Library;

 import 'package:kernel/target/targets.dart' show Target;
@@ -2,7 +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.

-bool equalLists<T>(List<T> a, List<T> b) {
+bool equalLists<T>(List<T>? a, List<T>? b) {
  if (identical(a, b)) return true;
  if (a == null || b == null) return false;
  if (a.length != b.length) return false;
@@ -12,7 +12,7 @@ bool equalLists<T>(List<T> a, List<T> b) {
  return true;
 }

-bool equalSets<K>(Set<K> a, Set<K> b) {
+bool equalSets<K>(Set<K>? a, Set<K>? b) {
  if (identical(a, b)) return true;
  if (a == null || b == null) return false;
  if (a.length != b.length) return false;
@@ -22,7 +22,7 @@ bool equalSets<K>(Set<K> a, Set<K> b) {
  return true;
 }

-bool equalMaps<K, V>(Map<K, V> a, Map<K, V> b) {
+bool equalMaps<K, V>(Map<K, V>? a, Map<K, V>? b) {
  if (identical(a, b)) return true;
  if (a == null || b == null) return false;
  if (a.length != b.length) return false;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 export 'package:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
    show DiagnosticMessage, DiagnosticMessageHandler, getMessageUri;

@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:kernel/ast.dart' show DartType, Member;
 import 'package:kernel/src/text_util.dart';

@@ -106,7 +106,7 @@ class LibrariesSpecification {
  /// The library specification for a given [target], or throws if none is
  /// available.
  TargetLibrariesSpecification specificationFor(String target) {
-    TargetLibrariesSpecification targetSpec = _targets[target];
+    TargetLibrariesSpecification? targetSpec = _targets[target];
    if (targetSpec == null) {
      throw new LibrariesSpecificationException(
          'No library specification for target "$target"');
@@ -119,15 +119,15 @@ class LibrariesSpecification {
  ///
  /// May throw an exception if [json] is not properly formatted or contains
  /// invalid values.
-  static LibrariesSpecification parse(Uri baseUri, String json) {
+  static LibrariesSpecification parse(Uri baseUri, String? json) {
    if (json == null) return const LibrariesSpecification();
    Map<String, dynamic> jsonData;
    try {
      dynamic data = jsonDecode(json);
-      if (data is! Map) {
+      if (data is! Map<String, dynamic>) {
        return _reportError('top-level specification is not a map');
      }
-      jsonData = data as Map;
+      jsonData = data;
    } on FormatException catch (e) {
      throw new LibrariesSpecificationException(e);
    }
@@ -145,11 +145,11 @@ class LibrariesSpecification {
            "for '$targetName' doesn't have a libraries entry");
      }
      dynamic librariesData = targetData["libraries"];
-      if (librariesData is! Map) {
+      if (librariesData is! Map<String, dynamic>) {
        return _reportError("libraries entry for '$targetName' is not a map");
      }
      librariesData.forEach((String name, data) {
-        if (data is! Map) {
+        if (data is! Map<String, dynamic>) {
          return _reportError(
              "library data for '$name' in target '$targetName' is not a map");
        }
@@ -233,7 +233,7 @@ class TargetLibrariesSpecification {
      [this._libraries = const <String, LibraryInfo>{}]);

  /// Details about a library whose import is `dart:$name`.
-  LibraryInfo libraryInfoFor(String name) => _libraries[name];
+  LibraryInfo? libraryInfoFor(String name) => _libraries[name];

  Iterable<LibraryInfo> get allLibraries => _libraries.values;
 }
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// A bit flag used by [LibraryInfo] indicating that a library is used by
 /// dart2js.
 ///
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:io' show exitCode;

 import 'dart:typed_data' show Uint8List;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import "dart:io" show File, Platform;

 import 'package:kernel/ast.dart' show Source;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.declaration;

 import '../problems.dart' show unsupported;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.builtin_type_builder;

 import 'package:kernel/ast.dart' show DartType, Nullability;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.class_builder;

 import 'package:kernel/ast.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:_fe_analyzer_shared/src/scanner/token.dart' show Token;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.constructor_reference_builder;

 import '../messages.dart' show noLength, templateConstructorNotFound;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:kernel/ast.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.dynamic_type_builder;

 import 'package:kernel/ast.dart' show DartType;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.enum_builder;

 import 'package:kernel/ast.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:kernel/ast.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.field_builder;

 import 'package:_fe_analyzer_shared/src/scanner/scanner.dart' show Token;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:kernel/ast.dart' hide MapEntry;

 import '../problems.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.formal_parameter_builder;

 import 'package:_fe_analyzer_shared/src/parser/formal_parameter_kind.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.procedure_builder;

 import 'dart:core' hide MapEntry;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.function_type_builder;

 import 'package:kernel/ast.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.future_or_type_builder;

 import 'package:kernel/ast.dart' show DartType, FutureOrType, Nullability;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.invalid_type_builder;

 import 'package:kernel/ast.dart' show DartType, InvalidType, Nullability;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.library_builder;

 import 'package:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.member_builder;

 import 'dart:core' hide MapEntry;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.metadata_builder;

 import 'package:_fe_analyzer_shared/src/scanner/scanner.dart' show Token;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.mixin_application_builder;

 import 'package:kernel/ast.dart' show InterfaceType, Supertype, TypedefType;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.modifier_builder;

 import '../modifier.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.name_iterator;

 import 'builder.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.named_type_builder;

 import 'package:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.never_type_builder;

 import 'package:kernel/ast.dart' show DartType, NullType, Nullability;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.null_type_declaration_builder;

 import 'package:kernel/ast.dart' show DartType, Nullability;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:kernel/ast.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.prefix_builder;

 import 'package:kernel/ast.dart' show LibraryDependency;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:front_end/src/fasta/dill/dill_member_builder.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.function_type_alias_builder;

 import 'package:kernel/ast.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.type_builder;

 import 'package:kernel/ast.dart' show DartType, Supertype, TypedefType;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.type_declaration_builder;

 import 'package:kernel/ast.dart' show DartType, Nullability;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.type_variable_builder;

 import 'package:kernel/ast.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.unresolved_type;

 import '../scope.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.kernel_variable_builder;

 import 'package:kernel/ast.dart' show VariableDeclaration;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.void_type_builder;

 import 'package:kernel/ast.dart' show DartType;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.builder_graph;

 import 'package:kernel/kernel.dart' show LibraryDependency, LibraryPart;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// Provides a default implementation of the report and format methods of
 /// [CompilerContext] that are suitable for command-line tools. The methods in
 /// this library aren't intended to be called directly, instead, one should use
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.compiler_context;

 import 'dart:async' show Zone, runZoned;
@@ -9,6 +9,7 @@ class Configuration {
  final String dottedName;
  final String condition;
  final String importUri;
+
  Configuration(
      this.charOffset, this.dottedName, this.condition, this.importUri);
 }
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.crash;

 import 'dart:convert' show jsonEncode;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.dill_class_builder;

 import 'package:kernel/ast.dart' hide MapEntry;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:kernel/ast.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:kernel/ast.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.dill_library_builder;

 import 'dart:convert' show jsonDecode;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.dill_loader;

 import 'package:kernel/ast.dart' show Class, Component, DartType, Library;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.dill_member_builder;

 import 'package:kernel/ast.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.dill_target;

 import 'package:front_end/src/fasta/builder/library_builder.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.dill_typedef_builder;

 import 'package:kernel/ast.dart' show DartType, InvalidType, NullType, Typedef;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.export;

 import 'builder/builder.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.codes;

 import 'package:_fe_analyzer_shared/src/messages/codes.dart'
@@ -1,7 +1,9 @@
-// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2021, 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
+
 // NOTE: THIS FILE IS GENERATED. DO NOT EDIT.
 //
 // Instead modify 'pkg/front_end/messages.yaml' and run
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.get_dependencies;

 import 'package:kernel/kernel.dart' show Component, loadComponentFromBytes;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// A memory + physical file system used to mock input for tests but provide
 /// sdk sources from disk.
 library front_end.src.hybrid_file_system;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.qualified_name;

 import 'package:_fe_analyzer_shared/src/scanner/scanner.dart' show Token;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.ignored_parser_errors;

 import 'package:_fe_analyzer_shared/src/parser/parser.dart' show optional;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.import;

 import 'package:kernel/ast.dart' show LibraryDependency;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.incremental_compiler;

 import 'package:front_end/src/api_prototype/experimental_flags.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.incremental_serializer;

 import 'dart:typed_data' show Uint8List;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.body_builder;

 import 'dart:core' hide MapEntry;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.class_hierarchy_builder;

 import 'package:kernel/ast.dart' hide MapEntry;
@@ -1,6 +1,9 @@
 // Copyright (c) 2019, 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
+
 library fasta.collections;

 import 'dart:core' hide MapEntry;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'package:kernel/ast.dart' hide MapEntry;

 import 'package:kernel/class_hierarchy.dart' show ClassHierarchyBase;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 part of 'constant_evaluator.dart';

 abstract class _ListOrSetConstantBuilder<L extends Expression> {
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// This library implements a kernel2kernel constant evaluation transformation.
 ///
 /// Even though it is expected that the frontend does not emit kernel AST which
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:kernel/ast.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// A library to help generate expression.
 library fasta.expression_generator;

@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.expression_generator_helper;

 import 'package:_fe_analyzer_shared/src/scanner/token.dart' show Token;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.fangorn;

 import 'dart:core' hide MapEntry;
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import "package:kernel/ast.dart"
    show
        Arguments,
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 library fasta.implicit_type;

 import 'package:_fe_analyzer_shared/src/scanner/token.dart' show Token;
@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.

+// @dart = 2.9
+
 library fasta.implicit_type_argument;

 import 'package:kernel/ast.dart'
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 import 'dart:core' hide MapEntry;

 import 'package:_fe_analyzer_shared/src/util/link.dart';
@@ -2,6 +2,8 @@
 // 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.

+// @dart = 2.9
+
 /// This file declares a "shadow hierarchy" of concrete classes which extend
 /// the kernel class hierarchy, adding methods and fields needed by the
 /// BodyBuilder.
--- a/Show More
+++ b/Show More