Version 2.12.0-242.0.dev
Merge commit '903e92a1963c38f6825b738c222af849c834e3a4' into 'dev'
diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
index 9257edd..dfab19e 100644
--- a/.dart_tool/package_config.json
+++ b/.dart_tool/package_config.json
@@ -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",
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 f5498a2..612de52 100644
--- a/pkg/_fe_analyzer_shared/lib/src/messages/codes_generated.dart
+++ b/pkg/_fe_analyzer_shared/lib/src/messages/codes_generated.dart
@@ -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.
diff --git a/pkg/dartdev/test/commands/compile_test.dart b/pkg/dartdev/test/commands/compile_test.dart
index 3ec08f6..0921ddd 100644
--- a/pkg/dartdev/test/commands/compile_test.dart
+++ b/pkg/dartdev/test/commands/compile_test.dart
@@ -356,145 +356,4 @@
expect(File(outFile).existsSync(), true,
reason: 'File not found: $outFile');
});
-
- test('Compile AOT snapshot with sound null safety', () {
- final p = project(mainSrc: '''void main() {}''');
- final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
- final outFile = path.canonicalize(path.join(p.dirPath, 'myaot'));
-
- var result = p.runSync(
- [
- 'compile',
- 'aot-snapshot',
- '-o',
- outFile,
- inFile,
- ],
- );
-
- expect(result.stdout, contains(soundNullSafetyMessage));
- expect(result.stderr, isEmpty);
- expect(result.exitCode, 0);
- expect(File(outFile).existsSync(), true,
- reason: 'File not found: $outFile');
- });
-
- test('Compile AOT snapshot with unsound null safety', () {
- final p = project(mainSrc: '''
-// @dart=2.9
-void main() {}
-''');
- final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
- final outFile = path.canonicalize(path.join(p.dirPath, 'myaot'));
-
- var result = p.runSync(
- [
- 'compile',
- 'aot-snapshot',
- '-o',
- outFile,
- inFile,
- ],
- );
-
- expect(result.stdout, contains(unsoundNullSafetyMessage));
- expect(result.stderr, isEmpty);
- expect(result.exitCode, 0);
- expect(File(outFile).existsSync(), true,
- reason: 'File not found: $outFile');
- });
-
- test('Compile kernel with sound null safety', () {
- final p = project(mainSrc: '''void main() {}''');
- final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
- final outFile = path.canonicalize(path.join(p.dirPath, 'mydill'));
-
- var result = p.runSync(
- [
- 'compile',
- 'kernel',
- '-o',
- outFile,
- inFile,
- ],
- );
-
- expect(result.stdout, contains(soundNullSafetyMessage));
- expect(result.stderr, isEmpty);
- expect(result.exitCode, 0);
- expect(File(outFile).existsSync(), true,
- reason: 'File not found: $outFile');
- });
-
- test('Compile kernel with unsound null safety', () {
- final p = project(mainSrc: '''
-// @dart=2.9
-void main() {}
-''');
- final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
- final outFile = path.canonicalize(path.join(p.dirPath, 'mydill'));
-
- var result = p.runSync(
- [
- 'compile',
- 'kernel',
- '-o',
- outFile,
- inFile,
- ],
- );
-
- expect(result.stdout, contains(unsoundNullSafetyMessage));
- expect(result.stderr, isEmpty);
- expect(result.exitCode, 0);
- expect(File(outFile).existsSync(), true,
- reason: 'File not found: $outFile');
- });
-
- test('Compile JIT snapshot with sound null safety', () {
- final p = project(mainSrc: '''void main() {}''');
- final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
- final outFile = path.canonicalize(path.join(p.dirPath, 'myjit'));
-
- var result = p.runSync(
- [
- 'compile',
- 'jit-snapshot',
- '-o',
- outFile,
- inFile,
- ],
- );
-
- expect(result.stdout, contains(soundNullSafetyMessage));
- expect(result.stderr, isEmpty);
- expect(result.exitCode, 0);
- expect(File(outFile).existsSync(), true,
- reason: 'File not found: $outFile');
- });
-
- test('Compile JIT snapshot with unsound null safety', () {
- final p = project(mainSrc: '''
-// @dart=2.9
-void main() {}
-''');
- final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
- final outFile = path.canonicalize(path.join(p.dirPath, 'myjit'));
-
- var result = p.runSync(
- [
- 'compile',
- 'jit-snapshot',
- '-o',
- outFile,
- inFile,
- ],
- );
-
- expect(result.stdout, contains(unsoundNullSafetyMessage));
- expect(result.stderr, isEmpty);
- expect(result.exitCode, 0);
- expect(File(outFile).existsSync(), true,
- reason: 'File not found: $outFile');
- });
}
diff --git a/pkg/front_end/benchmarks/ikg/dart2js.dart b/pkg/front_end/benchmarks/ikg/dart2js.dart
index ebc4b21..3877ff2 100644
--- a/pkg/front_end/benchmarks/ikg/dart2js.dart
+++ b/pkg/front_end/benchmarks/ikg/dart2js.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:compiler/src/dart2js.dart' as dart2js;
main(args) => dart2js.main(args);
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 7639c95..5e0b86b 100644
--- a/pkg/front_end/lib/src/api_prototype/compiler_options.dart
+++ b/pkg/front_end/lib/src/api_prototype/compiler_options.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.compiler_options;
import 'package:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
diff --git a/pkg/front_end/lib/src/api_prototype/constant_evaluator.dart b/pkg/front_end/lib/src/api_prototype/constant_evaluator.dart
index 98dd0ab..5427e63 100644
--- a/pkg/front_end/lib/src/api_prototype/constant_evaluator.dart
+++ b/pkg/front_end/lib/src/api_prototype/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
+
library front_end.constant_evaluator;
export '../fasta/kernel/constant_evaluator.dart'
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 d0057f7..088b517 100644
--- a/pkg/front_end/lib/src/api_prototype/experimental_flags.dart
+++ b/pkg/front_end/lib/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
+
import 'package:kernel/kernel.dart' show Version;
part 'experimental_flags_generated.dart';
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 9be22af..dfdef38 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
@@ -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
diff --git a/pkg/front_end/lib/src/api_prototype/front_end.dart b/pkg/front_end/lib/src/api_prototype/front_end.dart
index 3830dbe..1ef9263 100644
--- a/pkg/front_end/lib/src/api_prototype/front_end.dart
+++ b/pkg/front_end/lib/src/api_prototype/front_end.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
+
/// 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.
diff --git a/pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart b/pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart
index e5b1bc2..1e2a446 100644
--- a/pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart
+++ b/pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart
@@ -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;
diff --git a/pkg/front_end/lib/src/api_prototype/kernel_generator.dart b/pkg/front_end/lib/src/api_prototype/kernel_generator.dart
index 27857a9..6e80dc5 100644
--- a/pkg/front_end/lib/src/api_prototype/kernel_generator.dart
+++ b/pkg/front_end/lib/src/api_prototype/kernel_generator.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
+
/// Defines the front-end API for converting source code to Dart Kernel objects.
library front_end.kernel_generator;
diff --git a/pkg/front_end/lib/src/api_prototype/language_version.dart b/pkg/front_end/lib/src/api_prototype/language_version.dart
index 02db78f..84b27fd 100644
--- a/pkg/front_end/lib/src/api_prototype/language_version.dart
+++ b/pkg/front_end/lib/src/api_prototype/language_version.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:typed_data' show Uint8List;
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart'
diff --git a/pkg/front_end/lib/src/api_prototype/lowering_predicates.dart b/pkg/front_end/lib/src/api_prototype/lowering_predicates.dart
index 391be7e..50da5f6 100644
--- a/pkg/front_end/lib/src/api_prototype/lowering_predicates.dart
+++ b/pkg/front_end/lib/src/api_prototype/lowering_predicates.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;
diff --git a/pkg/front_end/lib/src/api_prototype/memory_file_system.dart b/pkg/front_end/lib/src/api_prototype/memory_file_system.dart
index e077d8d..194393b 100644
--- a/pkg/front_end/lib/src/api_prototype/memory_file_system.dart
+++ b/pkg/front_end/lib/src/api_prototype/memory_file_system.dart
@@ -87,7 +87,7 @@
@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.');
}
diff --git a/pkg/front_end/lib/src/api_prototype/standard_file_system.dart b/pkg/front_end/lib/src/api_prototype/standard_file_system.dart
index a8bbc0b..bc1a4bc 100644
--- a/pkg/front_end/lib/src/api_prototype/standard_file_system.dart
+++ b/pkg/front_end/lib/src/api_prototype/standard_file_system.dart
@@ -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;
diff --git a/pkg/front_end/lib/src/api_prototype/summary_generator.dart b/pkg/front_end/lib/src/api_prototype/summary_generator.dart
index d579536..0492289 100644
--- a/pkg/front_end/lib/src/api_prototype/summary_generator.dart
+++ b/pkg/front_end/lib/src/api_prototype/summary_generator.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
+
/// Defines the front-end API for converting source code to summaries.
library front_end.summary_generator;
diff --git a/pkg/front_end/lib/src/api_unstable/bazel_worker.dart b/pkg/front_end/lib/src/api_unstable/bazel_worker.dart
index 48df5c9..9cfd890 100644
--- a/pkg/front_end/lib/src/api_unstable/bazel_worker.dart
+++ b/pkg/front_end/lib/src/api_unstable/bazel_worker.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
+
/// 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.
diff --git a/pkg/front_end/lib/src/api_unstable/compiler_state.dart b/pkg/front_end/lib/src/api_unstable/compiler_state.dart
index 9baa0b7..97779f8 100644
--- a/pkg/front_end/lib/src/api_unstable/compiler_state.dart
+++ b/pkg/front_end/lib/src/api_unstable/compiler_state.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 '../api_prototype/compiler_options.dart' show CompilerOptions;
import '../base/processed_options.dart' show ProcessedOptions;
diff --git a/pkg/front_end/lib/src/api_unstable/dart2js.dart b/pkg/front_end/lib/src/api_unstable/dart2js.dart
index 9a102ac..358c006 100644
--- a/pkg/front_end/lib/src/api_unstable/dart2js.dart
+++ b/pkg/front_end/lib/src/api_unstable/dart2js.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:_fe_analyzer_shared/src/messages/codes.dart'
show messageMissingMain;
diff --git a/pkg/front_end/lib/src/api_unstable/ddc.dart b/pkg/front_end/lib/src/api_unstable/ddc.dart
index b28384f..c3de146 100644
--- a/pkg/front_end/lib/src/api_unstable/ddc.dart
+++ b/pkg/front_end/lib/src/api_unstable/ddc.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:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
show DiagnosticMessageHandler;
diff --git a/pkg/front_end/lib/src/api_unstable/modular_incremental_compilation.dart b/pkg/front_end/lib/src/api_unstable/modular_incremental_compilation.dart
index eb80f97..7086aad 100644
--- a/pkg/front_end/lib/src/api_unstable/modular_incremental_compilation.dart
+++ b/pkg/front_end/lib/src/api_unstable/modular_incremental_compilation.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 Component, CanonicalName, Library;
import 'package:kernel/target/targets.dart' show Target;
diff --git a/pkg/front_end/lib/src/api_unstable/util.dart b/pkg/front_end/lib/src/api_unstable/util.dart
index cc5f7fc..2200eff 100644
--- a/pkg/front_end/lib/src/api_unstable/util.dart
+++ b/pkg/front_end/lib/src/api_unstable/util.dart
@@ -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 @@
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 @@
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;
diff --git a/pkg/front_end/lib/src/api_unstable/vm.dart b/pkg/front_end/lib/src/api_unstable/vm.dart
index 65963f9..c816637 100644
--- a/pkg/front_end/lib/src/api_unstable/vm.dart
+++ b/pkg/front_end/lib/src/api_unstable/vm.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
+
export 'package:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
show DiagnosticMessage, DiagnosticMessageHandler, getMessageUri;
diff --git a/pkg/front_end/lib/src/base/instrumentation.dart b/pkg/front_end/lib/src/base/instrumentation.dart
index 8cf7170..24876a6 100644
--- a/pkg/front_end/lib/src/base/instrumentation.dart
+++ b/pkg/front_end/lib/src/base/instrumentation.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' show DartType, Member;
import 'package:kernel/src/text_util.dart';
diff --git a/pkg/front_end/lib/src/base/libraries_specification.dart b/pkg/front_end/lib/src/base/libraries_specification.dart
index 52a18dc..61f0028 100644
--- a/pkg/front_end/lib/src/base/libraries_specification.dart
+++ b/pkg/front_end/lib/src/base/libraries_specification.dart
@@ -106,7 +106,7 @@
/// 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 @@
///
/// 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 @@
"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 @@
[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;
}
diff --git a/pkg/front_end/lib/src/base/library_info.dart b/pkg/front_end/lib/src/base/library_info.dart
index f7541da..a8186f3 100644
--- a/pkg/front_end/lib/src/base/library_info.dart
+++ b/pkg/front_end/lib/src/base/library_info.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 bit flag used by [LibraryInfo] indicating that a library is used by
/// dart2js.
///
diff --git a/pkg/front_end/lib/src/base/processed_options.dart b/pkg/front_end/lib/src/base/processed_options.dart
index ec366d0..84f9e63 100644
--- a/pkg/front_end/lib/src/base/processed_options.dart
+++ b/pkg/front_end/lib/src/base/processed_options.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:io' show exitCode;
import 'dart:typed_data' show Uint8List;
diff --git a/pkg/front_end/lib/src/compute_platform_binaries_location.dart b/pkg/front_end/lib/src/compute_platform_binaries_location.dart
index 2c36d10..3060afb 100644
--- a/pkg/front_end/lib/src/compute_platform_binaries_location.dart
+++ b/pkg/front_end/lib/src/compute_platform_binaries_location.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:io" show File, Platform;
import 'package:kernel/ast.dart' show Source;
diff --git a/pkg/front_end/lib/src/fasta/builder/builder.dart b/pkg/front_end/lib/src/fasta/builder/builder.dart
index 709c4cfcc..4f2897d 100644
--- a/pkg/front_end/lib/src/fasta/builder/builder.dart
+++ b/pkg/front_end/lib/src/fasta/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.declaration;
import '../problems.dart' show unsupported;
diff --git a/pkg/front_end/lib/src/fasta/builder/builtin_type_declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/builtin_type_declaration_builder.dart
index 24d258e..7f39862 100644
--- a/pkg/front_end/lib/src/fasta/builder/builtin_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/builtin_type_declaration_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.builtin_type_builder;
import 'package:kernel/ast.dart' show DartType, Nullability;
diff --git a/pkg/front_end/lib/src/fasta/builder/class_builder.dart b/pkg/front_end/lib/src/fasta/builder/class_builder.dart
index 6b97dd9..d778446 100644
--- a/pkg/front_end/lib/src/fasta/builder/class_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/class_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.class_builder;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/builder/constructor_builder.dart b/pkg/front_end/lib/src/fasta/builder/constructor_builder.dart
index 03f46c7..e962880 100644
--- a/pkg/front_end/lib/src/fasta/builder/constructor_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/constructor_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
+
import 'dart:core' hide MapEntry;
import 'package:_fe_analyzer_shared/src/scanner/token.dart' show Token;
diff --git a/pkg/front_end/lib/src/fasta/builder/constructor_reference_builder.dart b/pkg/front_end/lib/src/fasta/builder/constructor_reference_builder.dart
index eb66bc8..824d08f 100644
--- a/pkg/front_end/lib/src/fasta/builder/constructor_reference_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/constructor_reference_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.constructor_reference_builder;
import '../messages.dart' show noLength, templateConstructorNotFound;
diff --git a/pkg/front_end/lib/src/fasta/builder/declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/declaration_builder.dart
index 01d9fb0..0ba64f4 100644
--- a/pkg/front_end/lib/src/fasta/builder/declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/declaration_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
+
import 'dart:core' hide MapEntry;
import 'package:kernel/ast.dart';
diff --git a/pkg/front_end/lib/src/fasta/builder/dynamic_type_declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/dynamic_type_declaration_builder.dart
index b5e9b80..cdc6f30 100644
--- a/pkg/front_end/lib/src/fasta/builder/dynamic_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/dynamic_type_declaration_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.dynamic_type_builder;
import 'package:kernel/ast.dart' show DartType;
diff --git a/pkg/front_end/lib/src/fasta/builder/enum_builder.dart b/pkg/front_end/lib/src/fasta/builder/enum_builder.dart
index 6920c7b..7101cf2 100644
--- a/pkg/front_end/lib/src/fasta/builder/enum_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/enum_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.enum_builder;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/builder/extension_builder.dart b/pkg/front_end/lib/src/fasta/builder/extension_builder.dart
index b361811..b0bc5db 100644
--- a/pkg/front_end/lib/src/fasta/builder/extension_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/extension_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
+
import 'dart:core' hide MapEntry;
import 'package:kernel/ast.dart';
diff --git a/pkg/front_end/lib/src/fasta/builder/field_builder.dart b/pkg/front_end/lib/src/fasta/builder/field_builder.dart
index 2d5ad31..1e3fce0 100644
--- a/pkg/front_end/lib/src/fasta/builder/field_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/field_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.field_builder;
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart' show Token;
diff --git a/pkg/front_end/lib/src/fasta/builder/fixed_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/fixed_type_builder.dart
index d6eb954..3f91098 100644
--- a/pkg/front_end/lib/src/fasta/builder/fixed_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/fixed_type_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
+
import 'package:kernel/ast.dart' hide MapEntry;
import '../problems.dart';
diff --git a/pkg/front_end/lib/src/fasta/builder/formal_parameter_builder.dart b/pkg/front_end/lib/src/fasta/builder/formal_parameter_builder.dart
index 626190e..8a9751d 100644
--- a/pkg/front_end/lib/src/fasta/builder/formal_parameter_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/formal_parameter_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.formal_parameter_builder;
import 'package:_fe_analyzer_shared/src/parser/formal_parameter_kind.dart'
diff --git a/pkg/front_end/lib/src/fasta/builder/function_builder.dart b/pkg/front_end/lib/src/fasta/builder/function_builder.dart
index 129c01a..4bdfca5 100644
--- a/pkg/front_end/lib/src/fasta/builder/function_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/function_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.procedure_builder;
import 'dart:core' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/builder/function_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/function_type_builder.dart
index 3143c2d..1f5bbe7 100644
--- a/pkg/front_end/lib/src/fasta/builder/function_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/function_type_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_builder;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/builder/future_or_type_declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/future_or_type_declaration_builder.dart
index bc3c296..3e3e050 100644
--- a/pkg/front_end/lib/src/fasta/builder/future_or_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/future_or_type_declaration_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.future_or_type_builder;
import 'package:kernel/ast.dart' show DartType, FutureOrType, Nullability;
diff --git a/pkg/front_end/lib/src/fasta/builder/invalid_type_declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/invalid_type_declaration_builder.dart
index d101dfa..bce176c5 100644
--- a/pkg/front_end/lib/src/fasta/builder/invalid_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/invalid_type_declaration_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.invalid_type_builder;
import 'package:kernel/ast.dart' show DartType, InvalidType, Nullability;
diff --git a/pkg/front_end/lib/src/fasta/builder/library_builder.dart b/pkg/front_end/lib/src/fasta/builder/library_builder.dart
index 7f80ef3e..f318572 100644
--- a/pkg/front_end/lib/src/fasta/builder/library_builder.dart
+++ b/pkg/front_end/lib/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.library_builder;
import 'package:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
diff --git a/pkg/front_end/lib/src/fasta/builder/member_builder.dart b/pkg/front_end/lib/src/fasta/builder/member_builder.dart
index 2d3168d..d28c5ac 100644
--- a/pkg/front_end/lib/src/fasta/builder/member_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/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.member_builder;
import 'dart:core' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/builder/metadata_builder.dart b/pkg/front_end/lib/src/fasta/builder/metadata_builder.dart
index 80978bb..910119c 100644
--- a/pkg/front_end/lib/src/fasta/builder/metadata_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/metadata_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.metadata_builder;
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart' show Token;
diff --git a/pkg/front_end/lib/src/fasta/builder/mixin_application_builder.dart b/pkg/front_end/lib/src/fasta/builder/mixin_application_builder.dart
index e78679d..e1439c5 100644
--- a/pkg/front_end/lib/src/fasta/builder/mixin_application_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/mixin_application_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.mixin_application_builder;
import 'package:kernel/ast.dart' show InterfaceType, Supertype, TypedefType;
diff --git a/pkg/front_end/lib/src/fasta/builder/modifier_builder.dart b/pkg/front_end/lib/src/fasta/builder/modifier_builder.dart
index 7820923..8836414 100644
--- a/pkg/front_end/lib/src/fasta/builder/modifier_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/modifier_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.modifier_builder;
import '../modifier.dart';
diff --git a/pkg/front_end/lib/src/fasta/builder/name_iterator.dart b/pkg/front_end/lib/src/fasta/builder/name_iterator.dart
index 165dfb3..653a49b 100644
--- a/pkg/front_end/lib/src/fasta/builder/name_iterator.dart
+++ b/pkg/front_end/lib/src/fasta/builder/name_iterator.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';
diff --git a/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart
index 54cd164..1618af1 100644
--- a/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/named_type_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;
diff --git a/pkg/front_end/lib/src/fasta/builder/never_type_declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/never_type_declaration_builder.dart
index 509dd32..c4d2e42 100644
--- a/pkg/front_end/lib/src/fasta/builder/never_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/never_type_declaration_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.never_type_builder;
import 'package:kernel/ast.dart' show DartType, NullType, Nullability;
diff --git a/pkg/front_end/lib/src/fasta/builder/null_type_declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/null_type_declaration_builder.dart
index cbfd853..4e81719 100644
--- a/pkg/front_end/lib/src/fasta/builder/null_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/null_type_declaration_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.null_type_declaration_builder;
import 'package:kernel/ast.dart' show DartType, Nullability;
diff --git a/pkg/front_end/lib/src/fasta/builder/nullability_builder.dart b/pkg/front_end/lib/src/fasta/builder/nullability_builder.dart
index 4d7b983..d14f2dc 100644
--- a/pkg/front_end/lib/src/fasta/builder/nullability_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/nullability_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
+
import 'dart:core' hide MapEntry;
import 'package:kernel/ast.dart';
diff --git a/pkg/front_end/lib/src/fasta/builder/prefix_builder.dart b/pkg/front_end/lib/src/fasta/builder/prefix_builder.dart
index 4fe2571..0635ea9 100644
--- a/pkg/front_end/lib/src/fasta/builder/prefix_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/prefix_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.prefix_builder;
import 'package:kernel/ast.dart' show LibraryDependency;
diff --git a/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart b/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
index 20ed8f7..a56d974 100644
--- a/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/procedure_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
+
import 'dart:core' hide MapEntry;
import 'package:front_end/src/fasta/dill/dill_member_builder.dart';
diff --git a/pkg/front_end/lib/src/fasta/builder/type_alias_builder.dart b/pkg/front_end/lib/src/fasta/builder/type_alias_builder.dart
index 9de74f1..c4c5502 100644
--- a/pkg/front_end/lib/src/fasta/builder/type_alias_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/type_alias_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'
diff --git a/pkg/front_end/lib/src/fasta/builder/type_builder.dart b/pkg/front_end/lib/src/fasta/builder/type_builder.dart
index d1ff518..2aed213 100644
--- a/pkg/front_end/lib/src/fasta/builder/type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/type_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.type_builder;
import 'package:kernel/ast.dart' show DartType, Supertype, TypedefType;
diff --git a/pkg/front_end/lib/src/fasta/builder/type_declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/type_declaration_builder.dart
index a8c16a1..cdfac5c 100644
--- a/pkg/front_end/lib/src/fasta/builder/type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/type_declaration_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.type_declaration_builder;
import 'package:kernel/ast.dart' show DartType, Nullability;
diff --git a/pkg/front_end/lib/src/fasta/builder/type_variable_builder.dart b/pkg/front_end/lib/src/fasta/builder/type_variable_builder.dart
index b73ea20..d8d4a27 100644
--- a/pkg/front_end/lib/src/fasta/builder/type_variable_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/type_variable_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.type_variable_builder;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/builder/unresolved_type.dart b/pkg/front_end/lib/src/fasta/builder/unresolved_type.dart
index f90ac59..8925e6b 100644
--- a/pkg/front_end/lib/src/fasta/builder/unresolved_type.dart
+++ b/pkg/front_end/lib/src/fasta/builder/unresolved_type.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';
diff --git a/pkg/front_end/lib/src/fasta/builder/variable_builder.dart b/pkg/front_end/lib/src/fasta/builder/variable_builder.dart
index cc006cb..17eb7f2 100644
--- a/pkg/front_end/lib/src/fasta/builder/variable_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/variable_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.kernel_variable_builder;
import 'package:kernel/ast.dart' show VariableDeclaration;
diff --git a/pkg/front_end/lib/src/fasta/builder/void_type_declaration_builder.dart b/pkg/front_end/lib/src/fasta/builder/void_type_declaration_builder.dart
index 25c6760..b50507a 100644
--- a/pkg/front_end/lib/src/fasta/builder/void_type_declaration_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/void_type_declaration_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.void_type_builder;
import 'package:kernel/ast.dart' show DartType;
diff --git a/pkg/front_end/lib/src/fasta/builder_graph.dart b/pkg/front_end/lib/src/fasta/builder_graph.dart
index 79539fd..f6f447a 100644
--- a/pkg/front_end/lib/src/fasta/builder_graph.dart
+++ b/pkg/front_end/lib/src/fasta/builder_graph.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.builder_graph;
import 'package:kernel/kernel.dart' show LibraryDependency, LibraryPart;
diff --git a/pkg/front_end/lib/src/fasta/command_line_reporting.dart b/pkg/front_end/lib/src/fasta/command_line_reporting.dart
index d8f6c95..2b05cc6 100644
--- a/pkg/front_end/lib/src/fasta/command_line_reporting.dart
+++ b/pkg/front_end/lib/src/fasta/command_line_reporting.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
+
/// 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
diff --git a/pkg/front_end/lib/src/fasta/compiler_context.dart b/pkg/front_end/lib/src/fasta/compiler_context.dart
index e64cd29..a1d2005 100644
--- a/pkg/front_end/lib/src/fasta/compiler_context.dart
+++ b/pkg/front_end/lib/src/fasta/compiler_context.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.compiler_context;
import 'dart:async' show Zone, runZoned;
diff --git a/pkg/front_end/lib/src/fasta/configuration.dart b/pkg/front_end/lib/src/fasta/configuration.dart
index d12a43a..f24e5bf 100644
--- a/pkg/front_end/lib/src/fasta/configuration.dart
+++ b/pkg/front_end/lib/src/fasta/configuration.dart
@@ -9,6 +9,7 @@
final String dottedName;
final String condition;
final String importUri;
+
Configuration(
this.charOffset, this.dottedName, this.condition, this.importUri);
}
diff --git a/pkg/front_end/lib/src/fasta/crash.dart b/pkg/front_end/lib/src/fasta/crash.dart
index 1ad20fc..82e44be 100644
--- a/pkg/front_end/lib/src/fasta/crash.dart
+++ b/pkg/front_end/lib/src/fasta/crash.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.crash;
import 'dart:convert' show jsonEncode;
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_class_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_class_builder.dart
index a548f80..93ee939 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_class_builder.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_class_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_class_builder;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_extension_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_extension_builder.dart
index a114dc6..b460387 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_extension_builder.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_extension_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
+
import 'dart:core' hide MapEntry;
import 'package:kernel/ast.dart';
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_extension_member_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_extension_member_builder.dart
index 02aa055..d946f72 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_extension_member_builder.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_extension_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
+
import 'dart:core' hide MapEntry;
import 'package:kernel/ast.dart';
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_library_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_library_builder.dart
index 08d1655..f4ddeff 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_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_library_builder;
import 'dart:convert' show jsonDecode;
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_loader.dart b/pkg/front_end/lib/src/fasta/dill/dill_loader.dart
index 2ce2498..8cbf077 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_loader.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_loader.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_loader;
import 'package:kernel/ast.dart' show Class, Component, DartType, Library;
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_member_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_member_builder.dart
index 272a08b..861e245 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_member_builder.dart
+++ b/pkg/front_end/lib/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.dill_member_builder;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_target.dart b/pkg/front_end/lib/src/fasta/dill/dill_target.dart
index 52fa515..9901f81 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_target.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_target.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'
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_type_alias_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_type_alias_builder.dart
index 9cf8bad..9020e68 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_type_alias_builder.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_type_alias_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;
diff --git a/pkg/front_end/lib/src/fasta/export.dart b/pkg/front_end/lib/src/fasta/export.dart
index e57cf8d..8ed7105 100644
--- a/pkg/front_end/lib/src/fasta/export.dart
+++ b/pkg/front_end/lib/src/fasta/export.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.export;
import 'builder/builder.dart';
diff --git a/pkg/front_end/lib/src/fasta/fasta_codes.dart b/pkg/front_end/lib/src/fasta/fasta_codes.dart
index 50f79c1..446cd72 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes.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'
diff --git a/pkg/front_end/lib/src/fasta/fasta_codes_cfe_generated.dart b/pkg/front_end/lib/src/fasta/fasta_codes_cfe_generated.dart
index 40b6228..a145ee7 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes_cfe_generated.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes_cfe_generated.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
diff --git a/pkg/front_end/lib/src/fasta/get_dependencies.dart b/pkg/front_end/lib/src/fasta/get_dependencies.dart
index 3a23778..903c1b0 100644
--- a/pkg/front_end/lib/src/fasta/get_dependencies.dart
+++ b/pkg/front_end/lib/src/fasta/get_dependencies.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.get_dependencies;
import 'package:kernel/kernel.dart' show Component, loadComponentFromBytes;
diff --git a/pkg/front_end/lib/src/fasta/hybrid_file_system.dart b/pkg/front_end/lib/src/fasta/hybrid_file_system.dart
index 3a78a1c..9f1a08b 100644
--- a/pkg/front_end/lib/src/fasta/hybrid_file_system.dart
+++ b/pkg/front_end/lib/src/fasta/hybrid_file_system.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 memory + physical file system used to mock input for tests but provide
/// sdk sources from disk.
library front_end.src.hybrid_file_system;
diff --git a/pkg/front_end/lib/src/fasta/identifiers.dart b/pkg/front_end/lib/src/fasta/identifiers.dart
index 64d6f92..f7dcd4f 100644
--- a/pkg/front_end/lib/src/fasta/identifiers.dart
+++ b/pkg/front_end/lib/src/fasta/identifiers.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.qualified_name;
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart' show Token;
diff --git a/pkg/front_end/lib/src/fasta/ignored_parser_errors.dart b/pkg/front_end/lib/src/fasta/ignored_parser_errors.dart
index fbd01f9..04b0e4a 100644
--- a/pkg/front_end/lib/src/fasta/ignored_parser_errors.dart
+++ b/pkg/front_end/lib/src/fasta/ignored_parser_errors.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.ignored_parser_errors;
import 'package:_fe_analyzer_shared/src/parser/parser.dart' show optional;
diff --git a/pkg/front_end/lib/src/fasta/import.dart b/pkg/front_end/lib/src/fasta/import.dart
index fe41e88..6a51033 100644
--- a/pkg/front_end/lib/src/fasta/import.dart
+++ b/pkg/front_end/lib/src/fasta/import.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.import;
import 'package:kernel/ast.dart' show LibraryDependency;
diff --git a/pkg/front_end/lib/src/fasta/incremental_compiler.dart b/pkg/front_end/lib/src/fasta/incremental_compiler.dart
index e629ce0..22a3f8b 100644
--- a/pkg/front_end/lib/src/fasta/incremental_compiler.dart
+++ b/pkg/front_end/lib/src/fasta/incremental_compiler.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_compiler;
import 'package:front_end/src/api_prototype/experimental_flags.dart';
diff --git a/pkg/front_end/lib/src/fasta/incremental_serializer.dart b/pkg/front_end/lib/src/fasta/incremental_serializer.dart
index 4581f16..208022e 100644
--- a/pkg/front_end/lib/src/fasta/incremental_serializer.dart
+++ b/pkg/front_end/lib/src/fasta/incremental_serializer.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;
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 a478938..7cd5823 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_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.body_builder;
import 'dart:core' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/kernel/class_hierarchy_builder.dart b/pkg/front_end/lib/src/fasta/kernel/class_hierarchy_builder.dart
index 9bd74a8..a0fc2ac 100644
--- a/pkg/front_end/lib/src/fasta/kernel/class_hierarchy_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/class_hierarchy_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.class_hierarchy_builder;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/kernel/collections.dart b/pkg/front_end/lib/src/fasta/kernel/collections.dart
index 79b99c0..1e2f994 100644
--- a/pkg/front_end/lib/src/fasta/kernel/collections.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/collections.dart
@@ -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;
diff --git a/pkg/front_end/lib/src/fasta/kernel/combined_member_signature.dart b/pkg/front_end/lib/src/fasta/kernel/combined_member_signature.dart
index 6dfd603..00467ed 100644
--- a/pkg/front_end/lib/src/fasta/kernel/combined_member_signature.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/combined_member_signature.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' hide MapEntry;
import 'package:kernel/class_hierarchy.dart' show ClassHierarchyBase;
diff --git a/pkg/front_end/lib/src/fasta/kernel/constant_collection_builders.dart b/pkg/front_end/lib/src/fasta/kernel/constant_collection_builders.dart
index f10419d..6d95ecf 100644
--- a/pkg/front_end/lib/src/fasta/kernel/constant_collection_builders.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/constant_collection_builders.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
+
part of 'constant_evaluator.dart';
abstract class _ListOrSetConstantBuilder<L extends Expression> {
diff --git a/pkg/front_end/lib/src/fasta/kernel/constant_evaluator.dart b/pkg/front_end/lib/src/fasta/kernel/constant_evaluator.dart
index 9ca9572..e332dbd 100644
--- a/pkg/front_end/lib/src/fasta/kernel/constant_evaluator.dart
+++ b/pkg/front_end/lib/src/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
+
/// This library implements a kernel2kernel constant evaluation transformation.
///
/// Even though it is expected that the frontend does not emit kernel AST which
diff --git a/pkg/front_end/lib/src/fasta/kernel/constant_int_folder.dart b/pkg/front_end/lib/src/fasta/kernel/constant_int_folder.dart
index 84dfd13..8d0c5b0 100644
--- a/pkg/front_end/lib/src/fasta/kernel/constant_int_folder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/constant_int_folder.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';
diff --git a/pkg/front_end/lib/src/fasta/kernel/expression_generator.dart b/pkg/front_end/lib/src/fasta/kernel/expression_generator.dart
index d42d1d5..24a3909 100644
--- a/pkg/front_end/lib/src/fasta/kernel/expression_generator.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/expression_generator.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;
diff --git a/pkg/front_end/lib/src/fasta/kernel/expression_generator_helper.dart b/pkg/front_end/lib/src/fasta/kernel/expression_generator_helper.dart
index 1666a65..eaa2468 100644
--- a/pkg/front_end/lib/src/fasta/kernel/expression_generator_helper.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/expression_generator_helper.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.expression_generator_helper;
import 'package:_fe_analyzer_shared/src/scanner/token.dart' show Token;
diff --git a/pkg/front_end/lib/src/fasta/kernel/forest.dart b/pkg/front_end/lib/src/fasta/kernel/forest.dart
index 75946bb..4c6d8d9 100644
--- a/pkg/front_end/lib/src/fasta/kernel/forest.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/forest.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.fangorn;
import 'dart:core' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/kernel/forwarding_node.dart b/pkg/front_end/lib/src/fasta/kernel/forwarding_node.dart
index 3bb758d..a647cbf 100644
--- a/pkg/front_end/lib/src/fasta/kernel/forwarding_node.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/forwarding_node.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"
show
Arguments,
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 ba124c9..f37b35c 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
@@ -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;
diff --git a/pkg/front_end/lib/src/fasta/kernel/implicit_type_argument.dart b/pkg/front_end/lib/src/fasta/kernel/implicit_type_argument.dart
index 2ab9dfb..c6daddf 100644
--- a/pkg/front_end/lib/src/fasta/kernel/implicit_type_argument.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/implicit_type_argument.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.md file.
+// @dart = 2.9
+
library fasta.implicit_type_argument;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/kernel/inference_visitor.dart b/pkg/front_end/lib/src/fasta/kernel/inference_visitor.dart
index 7762bfb..e7f9b2a 100644
--- a/pkg/front_end/lib/src/fasta/kernel/inference_visitor.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/inference_visitor.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';
diff --git a/pkg/front_end/lib/src/fasta/kernel/internal_ast.dart b/pkg/front_end/lib/src/fasta/kernel/internal_ast.dart
index 1f6acdd..b5160f0 100644
--- a/pkg/front_end/lib/src/fasta/kernel/internal_ast.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/internal_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
+
/// This file declares a "shadow hierarchy" of concrete classes which extend
/// the kernel class hierarchy, adding methods and fields needed by the
/// BodyBuilder.
diff --git a/pkg/front_end/lib/src/fasta/kernel/invalid_type.dart b/pkg/front_end/lib/src/fasta/kernel/invalid_type.dart
index fd05fdb..c361101 100644
--- a/pkg/front_end/lib/src/fasta/kernel/invalid_type.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/invalid_type.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.md file.
+// @dart = 2.9
+
import 'package:kernel/ast.dart' hide MapEntry;
import 'package:kernel/visitor.dart';
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_api.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_api.dart
index c8165a2..8724cfa 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_api.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_api.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 library exports all API from Kernel that can be used throughout fasta.
library fasta.kernel_api;
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_ast_api.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_ast_api.dart
index 19f4d2e..4733e7b 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_ast_api.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_ast_api.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 library exports all API from Kernel's ast.dart that can be used
/// throughout fasta.
library fasta.kernel_ast_api;
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_builder.dart
index c0b1459..93eed48 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_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.kernel_builder;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_constants.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_constants.dart
index cf9d6cb..55c93c5 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_constants.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_constants.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_constants;
import 'package:front_end/src/fasta/builder/library_builder.dart';
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
index 6ca84c6..8e75d57 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_target.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_target;
import 'package:front_end/src/api_prototype/experimental_flags.dart';
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_variable_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_variable_builder.dart
index c3400b1..31afc39 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_variable_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_variable_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.kernel_variable_builder;
import 'package:kernel/ast.dart' show VariableDeclaration;
diff --git a/pkg/front_end/lib/src/fasta/kernel/late_lowering.dart b/pkg/front_end/lib/src/fasta/kernel/late_lowering.dart
index 93eea7f..577359b 100644
--- a/pkg/front_end/lib/src/fasta/kernel/late_lowering.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/late_lowering.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' hide MapEntry;
import 'package:kernel/core_types.dart';
diff --git a/pkg/front_end/lib/src/fasta/kernel/load_library_builder.dart b/pkg/front_end/lib/src/fasta/kernel/load_library_builder.dart
index 81ea7a7..3639f4a 100644
--- a/pkg/front_end/lib/src/fasta/kernel/load_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/load_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
+
import 'package:kernel/ast.dart'
show
Arguments,
diff --git a/pkg/front_end/lib/src/fasta/kernel/member_covariance.dart b/pkg/front_end/lib/src/fasta/kernel/member_covariance.dart
index 6a5eaaf..6d4a9f1 100644
--- a/pkg/front_end/lib/src/fasta/kernel/member_covariance.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/member_covariance.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:math';
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/kernel/metadata_collector.dart b/pkg/front_end/lib/src/fasta/kernel/metadata_collector.dart
index 82f84f5..f77e230 100644
--- a/pkg/front_end/lib/src/fasta/kernel/metadata_collector.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/metadata_collector.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 Member, MetadataRepository, NamedNode;
/// The collector to add target specific metadata to.
diff --git a/pkg/front_end/lib/src/fasta/kernel/redirecting_factory_body.dart b/pkg/front_end/lib/src/fasta/kernel/redirecting_factory_body.dart
index 3a12ab4..0d82df2 100644
--- a/pkg/front_end/lib/src/fasta/kernel/redirecting_factory_body.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/redirecting_factory_body.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.redirecting_factory_body;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/kernel/transform_collections.dart b/pkg/front_end/lib/src/fasta/kernel/transform_collections.dart
index 6d2a8e6..b90df05 100644
--- a/pkg/front_end/lib/src/fasta/kernel/transform_collections.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/transform_collections.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.transform_collections;
import 'dart:core' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/kernel/transform_set_literals.dart b/pkg/front_end/lib/src/fasta/kernel/transform_set_literals.dart
index e9d5969..250493f 100644
--- a/pkg/front_end/lib/src/fasta/kernel/transform_set_literals.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/transform_set_literals.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.transform_set_literals;
import 'dart:core' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/kernel/type_algorithms.dart b/pkg/front_end/lib/src/fasta/kernel/type_algorithms.dart
index 48a5c3f..8b6464e 100644
--- a/pkg/front_end/lib/src/fasta/kernel/type_algorithms.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/type_algorithms.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.md file.
+// @dart = 2.9
+
import 'package:kernel/ast.dart'
show
BottomType,
diff --git a/pkg/front_end/lib/src/fasta/kernel/type_builder_computer.dart b/pkg/front_end/lib/src/fasta/kernel/type_builder_computer.dart
index ee11a13..82a9dc9 100644
--- a/pkg/front_end/lib/src/fasta/kernel/type_builder_computer.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/type_builder_computer.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_computer;
import 'package:_fe_analyzer_shared/src/parser/parser.dart'
diff --git a/pkg/front_end/lib/src/fasta/kernel/type_labeler.dart b/pkg/front_end/lib/src/fasta/kernel/type_labeler.dart
index aca8810..4784bf2 100644
--- a/pkg/front_end/lib/src/fasta/kernel/type_labeler.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/type_labeler.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:convert' show json;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/kernel/utils.dart b/pkg/front_end/lib/src/fasta/kernel/utils.dart
index 1eaf2b3..e55e325 100644
--- a/pkg/front_end/lib/src/fasta/kernel/utils.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/utils.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:io' show BytesBuilder, File, IOSink;
import 'dart:typed_data' show Uint8List;
diff --git a/pkg/front_end/lib/src/fasta/kernel/verifier.dart b/pkg/front_end/lib/src/fasta/kernel/verifier.dart
index a15a5c9..a5b190f 100644
--- a/pkg/front_end/lib/src/fasta/kernel/verifier.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/verifier.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.verifier;
import 'dart:core' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/library_graph.dart b/pkg/front_end/lib/src/fasta/library_graph.dart
index 5a75f85..5b93e51 100644
--- a/pkg/front_end/lib/src/fasta/library_graph.dart
+++ b/pkg/front_end/lib/src/fasta/library_graph.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.library_graph;
import 'package:kernel/kernel.dart'
diff --git a/pkg/front_end/lib/src/fasta/loader.dart b/pkg/front_end/lib/src/fasta/loader.dart
index 0c917db..41da009 100644
--- a/pkg/front_end/lib/src/fasta/loader.dart
+++ b/pkg/front_end/lib/src/fasta/loader.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.loader;
import 'dart:collection' show Queue;
diff --git a/pkg/front_end/lib/src/fasta/messages.dart b/pkg/front_end/lib/src/fasta/messages.dart
index 396f054..3f1330a 100644
--- a/pkg/front_end/lib/src/fasta/messages.dart
+++ b/pkg/front_end/lib/src/fasta/messages.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.messages;
import 'package:kernel/ast.dart'
diff --git a/pkg/front_end/lib/src/fasta/modifier.dart b/pkg/front_end/lib/src/fasta/modifier.dart
index c93ef12..32a6aa2 100644
--- a/pkg/front_end/lib/src/fasta/modifier.dart
+++ b/pkg/front_end/lib/src/fasta/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.modifier;
import 'problems.dart' show unhandled;
diff --git a/pkg/front_end/lib/src/fasta/names.dart b/pkg/front_end/lib/src/fasta/names.dart
index 229b64b..ba20ec8 100644
--- a/pkg/front_end/lib/src/fasta/names.dart
+++ b/pkg/front_end/lib/src/fasta/names.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.src.fasta.names;
import 'package:kernel/ast.dart' show Name;
diff --git a/pkg/front_end/lib/src/fasta/operator.dart b/pkg/front_end/lib/src/fasta/operator.dart
index 1617a5a..917c385 100644
--- a/pkg/front_end/lib/src/fasta/operator.dart
+++ b/pkg/front_end/lib/src/fasta/operator.dart
@@ -31,7 +31,7 @@
unaryMinus,
}
-Operator operatorFromString(String string) {
+Operator? operatorFromString(String string) {
if (identical("+", string)) return Operator.add;
if (identical("&", string)) return Operator.bitwiseAnd;
if (identical("~", string)) return Operator.bitwiseNot;
@@ -101,7 +101,6 @@
case Operator.unaryMinus:
return "unary-";
}
- return null;
}
int operatorRequiredArgumentCount(Operator operator) {
@@ -133,5 +132,4 @@
case Operator.indexSet:
return 2;
}
- return -1;
}
diff --git a/pkg/front_end/lib/src/fasta/problems.dart b/pkg/front_end/lib/src/fasta/problems.dart
index f1d61a2..db9552f 100644
--- a/pkg/front_end/lib/src/fasta/problems.dart
+++ b/pkg/front_end/lib/src/fasta/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.problems;
import 'package:_fe_analyzer_shared/src/messages/severity.dart'
diff --git a/pkg/front_end/lib/src/fasta/scope.dart b/pkg/front_end/lib/src/fasta/scope.dart
index 709e438..5fa0edf 100644
--- a/pkg/front_end/lib/src/fasta/scope.dart
+++ b/pkg/front_end/lib/src/fasta/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.scope;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/front_end/lib/src/fasta/source/diet_listener.dart b/pkg/front_end/lib/src/fasta/source/diet_listener.dart
index bc81fc6..2787514 100644
--- a/pkg/front_end/lib/src/fasta/source/diet_listener.dart
+++ b/pkg/front_end/lib/src/fasta/source/diet_listener.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.diet_listener;
import 'package:_fe_analyzer_shared/src/parser/parser.dart'
diff --git a/pkg/front_end/lib/src/fasta/source/directive_listener.dart b/pkg/front_end/lib/src/fasta/source/directive_listener.dart
index f912c9e..3c29fe1 100644
--- a/pkg/front_end/lib/src/fasta/source/directive_listener.dart
+++ b/pkg/front_end/lib/src/fasta/source/directive_listener.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
+
/// Listener used in combination with `TopLevelParser` to extract the URIs of
/// import, part, and export directives.
library front_end.src.fasta.source.directive_listener;
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 98a5907..c8aa4b5 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_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.outline_builder;
import 'package:_fe_analyzer_shared/src/parser/parser.dart'
diff --git a/pkg/front_end/lib/src/fasta/source/scope_listener.dart b/pkg/front_end/lib/src/fasta/source/scope_listener.dart
index 29bbad1..c445403 100644
--- a/pkg/front_end/lib/src/fasta/source/scope_listener.dart
+++ b/pkg/front_end/lib/src/fasta/source/scope_listener.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.scope_listener;
import 'package:_fe_analyzer_shared/src/parser/block_kind.dart' show BlockKind;
diff --git a/pkg/front_end/lib/src/fasta/source/source_class_builder.dart b/pkg/front_end/lib/src/fasta/source/source_class_builder.dart
index 7debb1a..5d920b5 100644
--- a/pkg/front_end/lib/src/fasta/source/source_class_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_class_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.source_class_builder;
import 'package:front_end/src/fasta/kernel/combined_member_signature.dart';
diff --git a/pkg/front_end/lib/src/fasta/source/source_extension_builder.dart b/pkg/front_end/lib/src/fasta/source/source_extension_builder.dart
index 28b3fb8..744ce07 100644
--- a/pkg/front_end/lib/src/fasta/source/source_extension_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_extension_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
+
import 'dart:core' hide MapEntry;
import 'package:kernel/ast.dart';
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 945cd98..7a2103d 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
@@ -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.source_library_builder;
import 'dart:convert' show jsonEncode;
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 1dbe91f..bfcc018 100644
--- a/pkg/front_end/lib/src/fasta/source/source_loader.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_loader.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.source_loader;
import 'dart:convert' show utf8;
diff --git a/pkg/front_end/lib/src/fasta/source/source_type_alias_builder.dart b/pkg/front_end/lib/src/fasta/source/source_type_alias_builder.dart
index 4061bce..dc61bf9 100644
--- a/pkg/front_end/lib/src/fasta/source/source_type_alias_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_type_alias_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.source_type_alias_builder;
import 'package:kernel/ast.dart'
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 543eaa4..83721d7 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
@@ -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.stack_listener_impl;
import 'package:_fe_analyzer_shared/src/messages/codes.dart' show Message;
diff --git a/pkg/front_end/lib/src/fasta/source/value_kinds.dart b/pkg/front_end/lib/src/fasta/source/value_kinds.dart
index e533e56..3fc36cc 100644
--- a/pkg/front_end/lib/src/fasta/source/value_kinds.dart
+++ b/pkg/front_end/lib/src/fasta/source/value_kinds.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:_fe_analyzer_shared/src/parser/stack_listener.dart'
show NullValue;
diff --git a/pkg/front_end/lib/src/fasta/target.dart b/pkg/front_end/lib/src/fasta/target.dart
index 8d2efd9..82ecb31 100644
--- a/pkg/front_end/lib/src/fasta/target.dart
+++ b/pkg/front_end/lib/src/fasta/target.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.target;
import 'package:kernel/ast.dart' show Component;
diff --git a/pkg/front_end/lib/src/fasta/target_implementation.dart b/pkg/front_end/lib/src/fasta/target_implementation.dart
index 2b8a091..8acd6b8 100644
--- a/pkg/front_end/lib/src/fasta/target_implementation.dart
+++ b/pkg/front_end/lib/src/fasta/target_implementation.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.target_implementation;
import 'package:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
diff --git a/pkg/front_end/lib/src/fasta/ticker.dart b/pkg/front_end/lib/src/fasta/ticker.dart
index b785cba..3c9d9c5 100644
--- a/pkg/front_end/lib/src/fasta/ticker.dart
+++ b/pkg/front_end/lib/src/fasta/ticker.dart
@@ -9,7 +9,7 @@
bool isVerbose;
- Duration previousTick;
+ late Duration previousTick;
Ticker({this.isVerbose: true}) {
previousTick = sw.elapsed;
diff --git a/pkg/front_end/lib/src/fasta/type_inference/closure_context.dart b/pkg/front_end/lib/src/fasta/type_inference/closure_context.dart
index 4de8315..78dc0c5 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/closure_context.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/closure_context.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.md file.
+// @dart = 2.9
+
part of 'type_inferrer.dart';
/// Keeps track of information about the innermost function or closure being
diff --git a/pkg/front_end/lib/src/fasta/type_inference/factor_type.dart b/pkg/front_end/lib/src/fasta/type_inference/factor_type.dart
index 8710222..1083882 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/factor_type.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/factor_type.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' hide MapEntry;
import 'package:kernel/type_environment.dart';
diff --git a/pkg/front_end/lib/src/fasta/type_inference/inference_helper.dart b/pkg/front_end/lib/src/fasta/type_inference/inference_helper.dart
index 9219313..4039519 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/inference_helper.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/inference_helper.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';
diff --git a/pkg/front_end/lib/src/fasta/type_inference/standard_bounds.dart b/pkg/front_end/lib/src/fasta/type_inference/standard_bounds.dart
index 4d04ad4..43b4e0e 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/standard_bounds.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/standard_bounds.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.md file.
+// @dart = 2.9
+
import 'package:kernel/ast.dart' show DartType, Library, NeverType, Nullability;
import 'package:kernel/src/standard_bounds.dart';
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 4b5d0f8..5e3122c 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
@@ -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
+
import 'package:kernel/ast.dart' hide MapEntry;
import 'package:kernel/core_types.dart';
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_demotion.dart b/pkg/front_end/lib/src/fasta/type_inference/type_demotion.dart
index 85bbacd..25d68b1 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_demotion.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_demotion.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.md file.
+// @dart = 2.9
+
import 'package:kernel/ast.dart' hide MapEntry;
import 'package:kernel/src/replacement_visitor.dart';
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 1a58eb6..9d674c0 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
@@ -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
+
import 'package:_fe_analyzer_shared/src/flow_analysis/flow_analysis.dart';
import 'package:front_end/src/fasta/kernel/internal_ast.dart';
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_inferrer.dart b/pkg/front_end/lib/src/fasta/type_inference/type_inferrer.dart
index 37f51ab..b183c32 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_inferrer.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_inferrer.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.md file.
+// @dart = 2.9
+
import 'dart:core' hide MapEntry;
import 'package:_fe_analyzer_shared/src/flow_analysis/flow_analysis.dart'
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 2ae32bf..f94934e 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
@@ -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
+
import 'package:kernel/ast.dart'
show DartType, Expression, TypeParameterType, VariableDeclaration;
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_schema.dart b/pkg/front_end/lib/src/fasta/type_inference/type_schema.dart
index 0e93526..883df40 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_schema.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_schema.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.md file.
+// @dart = 2.9
+
import 'package:kernel/ast.dart'
show
DartType,
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_schema_elimination.dart b/pkg/front_end/lib/src/fasta/type_inference/type_schema_elimination.dart
index e6338be..f07e42a 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_schema_elimination.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_schema_elimination.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.md file.
+// @dart = 2.9
+
import 'package:kernel/ast.dart' hide MapEntry;
import 'package:kernel/src/replacement_visitor.dart';
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_schema_environment.dart b/pkg/front_end/lib/src/fasta/type_inference/type_schema_environment.dart
index 3d12c45..0e12020 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_schema_environment.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_schema_environment.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.md file.
+// @dart = 2.9
+
import 'package:kernel/ast.dart' hide MapEntry;
import 'package:kernel/class_hierarchy.dart' show ClassHierarchy;
diff --git a/pkg/front_end/lib/src/fasta/uri_translator.dart b/pkg/front_end/lib/src/fasta/uri_translator.dart
index be2af3c..55222b2 100644
--- a/pkg/front_end/lib/src/fasta/uri_translator.dart
+++ b/pkg/front_end/lib/src/fasta/uri_translator.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.uri_translator;
import 'package:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
diff --git a/pkg/front_end/lib/src/fasta/util/bytes_sink.dart b/pkg/front_end/lib/src/fasta/util/bytes_sink.dart
index d945e92..4e3b61f 100644
--- a/pkg/front_end/lib/src/fasta/util/bytes_sink.dart
+++ b/pkg/front_end/lib/src/fasta/util/bytes_sink.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:io' show BytesBuilder;
// TODO(ahe): https://github.com/dart-lang/sdk/issues/28316
diff --git a/pkg/front_end/lib/src/fasta/util/direct_parser_ast.dart b/pkg/front_end/lib/src/fasta/util/direct_parser_ast.dart
index 3331e01..9a2fcea 100644
--- a/pkg/front_end/lib/src/fasta/util/direct_parser_ast.dart
+++ b/pkg/front_end/lib/src/fasta/util/direct_parser_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:typed_data' show Uint8List;
import 'dart:io' show File;
diff --git a/pkg/front_end/lib/src/fasta/util/direct_parser_ast_helper.dart b/pkg/front_end/lib/src/fasta/util/direct_parser_ast_helper.dart
index 70be181..cc76576 100644
--- a/pkg/front_end/lib/src/fasta/util/direct_parser_ast_helper.dart
+++ b/pkg/front_end/lib/src/fasta/util/direct_parser_ast_helper.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:_fe_analyzer_shared/src/parser/assert.dart';
import 'package:_fe_analyzer_shared/src/parser/block_kind.dart';
import 'package:_fe_analyzer_shared/src/parser/declaration_kind.dart';
diff --git a/pkg/front_end/lib/src/fasta/util/textual_outline.dart b/pkg/front_end/lib/src/fasta/util/textual_outline.dart
index 6b5d823..3f1cb92 100644
--- a/pkg/front_end/lib/src/fasta/util/textual_outline.dart
+++ b/pkg/front_end/lib/src/fasta/util/textual_outline.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:typed_data' show Uint8List;
import 'dart:io' show File;
diff --git a/pkg/front_end/lib/src/kernel_generator_impl.dart b/pkg/front_end/lib/src/kernel_generator_impl.dart
index d4ec55d..ac52474 100644
--- a/pkg/front_end/lib/src/kernel_generator_impl.dart
+++ b/pkg/front_end/lib/src/kernel_generator_impl.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
+
/// Defines the front-end API for converting source code to Dart Kernel objects.
library front_end.kernel_generator_impl;
diff --git a/pkg/front_end/lib/src/scheme_based_file_system.dart b/pkg/front_end/lib/src/scheme_based_file_system.dart
index c2b3981..f52f214 100644
--- a/pkg/front_end/lib/src/scheme_based_file_system.dart
+++ b/pkg/front_end/lib/src/scheme_based_file_system.dart
@@ -12,7 +12,7 @@
@override
FileSystemEntity entityForUri(Uri uri) {
- FileSystem delegate = fileSystemByScheme[uri.scheme];
+ FileSystem? delegate = fileSystemByScheme[uri.scheme];
if (delegate == null) {
throw new FileSystemException(
uri,
diff --git a/pkg/front_end/lib/src/testing/compiler_common.dart b/pkg/front_end/lib/src/testing/compiler_common.dart
index 3164c83..5f0e775 100644
--- a/pkg/front_end/lib/src/testing/compiler_common.dart
+++ b/pkg/front_end/lib/src/testing/compiler_common.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
+
/// Common compiler options and helper functions used for testing.
library front_end.testing.compiler_options_common;
diff --git a/pkg/front_end/lib/src/testing/id_extractor.dart b/pkg/front_end/lib/src/testing/id_extractor.dart
index 5216459..11247a0 100644
--- a/pkg/front_end/lib/src/testing/id_extractor.dart
+++ b/pkg/front_end/lib/src/testing/id_extractor.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:_fe_analyzer_shared/src/testing/id.dart';
import 'package:kernel/ast.dart';
import '../api_prototype/lowering_predicates.dart';
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 8d98cff..82e3414 100644
--- a/pkg/front_end/lib/src/testing/id_testing_helper.dart
+++ b/pkg/front_end/lib/src/testing/id_testing_helper.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:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
import 'package:_fe_analyzer_shared/src/testing/id.dart'
show ActualData, ClassId, Id, IdKind, IdValue, MemberId, NodeId;
diff --git a/pkg/front_end/lib/src/testing/id_testing_utils.dart b/pkg/front_end/lib/src/testing/id_testing_utils.dart
index 74b4740..a277ce2 100644
--- a/pkg/front_end/lib/src/testing/id_testing_utils.dart
+++ b/pkg/front_end/lib/src/testing/id_testing_utils.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/builder/class_builder.dart';
diff --git a/pkg/front_end/lib/widget_cache.dart b/pkg/front_end/lib/widget_cache.dart
index 5c9f6d3..695ed83 100644
--- a/pkg/front_end/lib/widget_cache.dart
+++ b/pkg/front_end/lib/widget_cache.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/class_hierarchy.dart';
import 'package:kernel/kernel.dart';
diff --git a/pkg/front_end/pubspec.yaml b/pkg/front_end/pubspec.yaml
index 20a36d8..6893010 100644
--- a/pkg/front_end/pubspec.yaml
+++ b/pkg/front_end/pubspec.yaml
@@ -6,7 +6,7 @@
publish_to: none
environment:
- sdk: '>=2.6.0 <3.0.0'
+ sdk: '>=2.12.0 <3.0.0'
dependencies:
_fe_analyzer_shared:
diff --git a/pkg/front_end/test/analyser_ignored/load_dill_twice_lib_1.dart b/pkg/front_end/test/analyser_ignored/load_dill_twice_lib_1.dart
index ca76918..443c3b5 100644
--- a/pkg/front_end/test/analyser_ignored/load_dill_twice_lib_1.dart
+++ b/pkg/front_end/test/analyser_ignored/load_dill_twice_lib_1.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
+
export 'load_dill_twice_lib_2.dart';
// Use annotation to force proper printing.
diff --git a/pkg/front_end/test/analyser_ignored/load_dill_twice_lib_2.dart b/pkg/front_end/test/analyser_ignored/load_dill_twice_lib_2.dart
index 5e9d38a..0ba97dd 100644
--- a/pkg/front_end/test/analyser_ignored/load_dill_twice_lib_2.dart
+++ b/pkg/front_end/test/analyser_ignored/load_dill_twice_lib_2.dart
@@ -2,4 +2,6 @@
// 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 foo() => 42;
diff --git a/pkg/front_end/test/analyser_ignored/load_dill_twice_test.dart b/pkg/front_end/test/analyser_ignored/load_dill_twice_test.dart
index ba07019..922ff5d 100644
--- a/pkg/front_end/test/analyser_ignored/load_dill_twice_test.dart
+++ b/pkg/front_end/test/analyser_ignored/load_dill_twice_test.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:io' show Platform, exit;
import 'package:kernel/binary/ast_from_binary.dart' show BinaryBuilder;
diff --git a/pkg/front_end/test/ast_nodes_has_to_string_test.dart b/pkg/front_end/test/ast_nodes_has_to_string_test.dart
index 9b0dc9f..028bedf 100644
--- a/pkg/front_end/test/ast_nodes_has_to_string_test.dart
+++ b/pkg/front_end/test/ast_nodes_has_to_string_test.dart
@@ -1,3 +1,9 @@
+// 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.md file.
+
+// @dart = 2.9
+
import 'dart:io' show File, Platform, stdin, exitCode;
import 'package:front_end/src/api_prototype/compiler_options.dart';
diff --git a/pkg/front_end/test/binary_md_dill_reader.dart b/pkg/front_end/test/binary_md_dill_reader.dart
index 271ffd8..d25607e 100644
--- a/pkg/front_end/test/binary_md_dill_reader.dart
+++ b/pkg/front_end/test/binary_md_dill_reader.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:math" as math;
class BinaryMdDillReader {
diff --git a/pkg/front_end/test/binary_md_vm_tags_and_version_test.dart b/pkg/front_end/test/binary_md_vm_tags_and_version_test.dart
index d9f412e..fdf5330 100644
--- a/pkg/front_end/test/binary_md_vm_tags_and_version_test.dart
+++ b/pkg/front_end/test/binary_md_vm_tags_and_version_test.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:io' show File, Platform;
import 'package:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
diff --git a/pkg/front_end/test/comments_on_certain_arguments_tool.dart b/pkg/front_end/test/comments_on_certain_arguments_tool.dart
index 41045b5..d83bf84 100644
--- a/pkg/front_end/test/comments_on_certain_arguments_tool.dart
+++ b/pkg/front_end/test/comments_on_certain_arguments_tool.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:convert' show utf8;
import 'dart:io'
show Directory, File, FileSystemEntity, exitCode, stdin, stdout;
diff --git a/pkg/front_end/test/compile_dart2js_with_no_sdk_test.dart b/pkg/front_end/test/compile_dart2js_with_no_sdk_test.dart
index 4939c11..513b868 100644
--- a/pkg/front_end/test/compile_dart2js_with_no_sdk_test.dart
+++ b/pkg/front_end/test/compile_dart2js_with_no_sdk_test.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:front_end/src/api_prototype/compiler_options.dart';
import 'incremental_load_from_dill_suite.dart'
diff --git a/pkg/front_end/test/compile_with_no_sdk_test.dart b/pkg/front_end/test/compile_with_no_sdk_test.dart
index b096688..5c7f5ca 100644
--- a/pkg/front_end/test/compile_with_no_sdk_test.dart
+++ b/pkg/front_end/test/compile_with_no_sdk_test.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:front_end/src/api_prototype/compiler_options.dart';
import 'package:front_end/src/api_prototype/memory_file_system.dart';
diff --git a/pkg/front_end/test/constant_evaluator_benchmark.dart b/pkg/front_end/test/constant_evaluator_benchmark.dart
index f0e722c..5de0a0a 100644
--- a/pkg/front_end/test/constant_evaluator_benchmark.dart
+++ b/pkg/front_end/test/constant_evaluator_benchmark.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:io' show File;
import 'dart:typed_data' show Uint8List;
diff --git a/pkg/front_end/test/covariance_check/covariance_check_test.dart b/pkg/front_end/test/covariance_check/covariance_check_test.dart
index 99dcbbc..ed0e223 100644
--- a/pkg/front_end/test/covariance_check/covariance_check_test.dart
+++ b/pkg/front_end/test/covariance_check/covariance_check_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart';
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/crashing_test_case_minimizer.dart b/pkg/front_end/test/crashing_test_case_minimizer.dart
index ea8ac64..46ce8f7 100644
--- a/pkg/front_end/test/crashing_test_case_minimizer.dart
+++ b/pkg/front_end/test/crashing_test_case_minimizer.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:convert' show jsonDecode;
import 'dart:io' show File;
diff --git a/pkg/front_end/test/crashing_test_case_minimizer_impl.dart b/pkg/front_end/test/crashing_test_case_minimizer_impl.dart
index 22ffcf8..6e8344c 100644
--- a/pkg/front_end/test/crashing_test_case_minimizer_impl.dart
+++ b/pkg/front_end/test/crashing_test_case_minimizer_impl.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:async' show Future, StreamSubscription;
import 'dart:convert' show JsonEncoder, jsonDecode, utf8;
diff --git a/pkg/front_end/test/deps_test.dart b/pkg/front_end/test/deps_test.dart
index 3bb12a7..c542bc5 100644
--- a/pkg/front_end/test/deps_test.dart
+++ b/pkg/front_end/test/deps_test.dart
@@ -1,3 +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.md file.
+
+// @dart = 2.9
+
import 'dart:io';
import 'package:_fe_analyzer_shared/src/messages/severity.dart';
diff --git a/pkg/front_end/test/desugar_test.dart b/pkg/front_end/test/desugar_test.dart
index b61a6a7..3ebad1e 100644
--- a/pkg/front_end/test/desugar_test.dart
+++ b/pkg/front_end/test/desugar_test.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
+
/// Test to ensure that desugaring APIs used by clients like dart2js are
/// always up to date.
///
diff --git a/pkg/front_end/test/dijkstras_sssp_algorithm.dart b/pkg/front_end/test/dijkstras_sssp_algorithm.dart
index b8f9789..0c93386 100644
--- a/pkg/front_end/test/dijkstras_sssp_algorithm.dart
+++ b/pkg/front_end/test/dijkstras_sssp_algorithm.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:collection';
/// Dijkstra's algorithm for single source shortest path.
diff --git a/pkg/front_end/test/dill_round_trip_test.dart b/pkg/front_end/test/dill_round_trip_test.dart
index a04c5e1..2842c9e 100644
--- a/pkg/front_end/test/dill_round_trip_test.dart
+++ b/pkg/front_end/test/dill_round_trip_test.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:front_end/src/fasta/kernel/utils.dart' show serializeComponent;
import 'package:kernel/ast.dart' show Component;
diff --git a/pkg/front_end/test/enable_non_nullable/enable_non_nullable_test.dart b/pkg/front_end/test/enable_non_nullable/enable_non_nullable_test.dart
index 8887306..85cce5b 100644
--- a/pkg/front_end/test/enable_non_nullable/enable_non_nullable_test.dart
+++ b/pkg/front_end/test/enable_non_nullable/enable_non_nullable_test.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.md file.
+// @dart = 2.9
+
import 'dart:io';
import 'package:expect/expect.dart';
diff --git a/pkg/front_end/test/explicit_creation_test.dart b/pkg/front_end/test/explicit_creation_test.dart
index 7e8246a..a0378d2 100644
--- a/pkg/front_end/test/explicit_creation_test.dart
+++ b/pkg/front_end/test/explicit_creation_test.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:io';
import 'package:_fe_analyzer_shared/src/messages/severity.dart';
diff --git a/pkg/front_end/test/extensions/extensions_test.dart b/pkg/front_end/test/extensions/extensions_test.dart
index 9cf6d7e..5ccb1e8 100644
--- a/pkg/front_end/test/extensions/extensions_test.dart
+++ b/pkg/front_end/test/extensions/extensions_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart';
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
diff --git a/pkg/front_end/test/fasta/ambiguous_export_test.dart b/pkg/front_end/test/fasta/ambiguous_export_test.dart
index 1bb1c23..b1e492b 100644
--- a/pkg/front_end/test/fasta/ambiguous_export_test.dart
+++ b/pkg/front_end/test/fasta/ambiguous_export_test.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.md file.
+// @dart = 2.9
+
import 'package:async_helper/async_helper.dart' show asyncTest;
import 'package:expect/expect.dart' show Expect;
diff --git a/pkg/front_end/test/fasta/analyze_src_with_lints_test.dart b/pkg/front_end/test/fasta/analyze_src_with_lints_test.dart
index 8ede953..652d6b7 100644
--- a/pkg/front_end/test/fasta/analyze_src_with_lints_test.dart
+++ b/pkg/front_end/test/fasta/analyze_src_with_lints_test.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:testing/src/run_tests.dart" as testing show main;
main() async {
diff --git a/pkg/front_end/test/fasta/analyze_test.dart b/pkg/front_end/test/fasta/analyze_test.dart
index cf52a50..044385e 100644
--- a/pkg/front_end/test/fasta/analyze_test.dart
+++ b/pkg/front_end/test/fasta/analyze_test.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:testing/src/run_tests.dart" as testing show main;
main() {
diff --git a/pkg/front_end/test/fasta/assert_locations_test.dart b/pkg/front_end/test/fasta/assert_locations_test.dart
index 532b311..c94a1e4 100644
--- a/pkg/front_end/test/fasta/assert_locations_test.dart
+++ b/pkg/front_end/test/fasta/assert_locations_test.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.md file.
+// @dart = 2.9
+
library fasta.test.assert_locations_test;
import 'package:async_helper/async_helper.dart' show asyncTest;
diff --git a/pkg/front_end/test/fasta/bootstrap_test.dart b/pkg/front_end/test/fasta/bootstrap_test.dart
index f48318a..bc75787 100644
--- a/pkg/front_end/test/fasta/bootstrap_test.dart
+++ b/pkg/front_end/test/fasta/bootstrap_test.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:io' show Directory, File, Platform;
import 'package:async_helper/async_helper.dart' show asyncEnd, asyncStart;
diff --git a/pkg/front_end/test/fasta/expression_suite.dart b/pkg/front_end/test/fasta/expression_suite.dart
index 2b29aa0..ddf7d48 100644
--- a/pkg/front_end/test/fasta/expression_suite.dart
+++ b/pkg/front_end/test/fasta/expression_suite.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.md file.
+// @dart = 2.9
+
library fasta.test.expression_test;
import "dart:convert" show JsonEncoder;
diff --git a/pkg/front_end/test/fasta/fast_strong_suite.dart b/pkg/front_end/test/fasta/fast_strong_suite.dart
index 8a0d844..e4395cb 100644
--- a/pkg/front_end/test/fasta/fast_strong_suite.dart
+++ b/pkg/front_end/test/fasta/fast_strong_suite.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.md file.
+// @dart = 2.9
+
library fasta.test.fast_strong_test;
import 'dart:io' show Platform;
diff --git a/pkg/front_end/test/fasta/generator_to_string_test.dart b/pkg/front_end/test/fasta/generator_to_string_test.dart
index 3ebb511..6adfa4c 100644
--- a/pkg/front_end/test/fasta/generator_to_string_test.dart
+++ b/pkg/front_end/test/fasta/generator_to_string_test.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
+
/// Test of toString on generators.
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart'
diff --git a/pkg/front_end/test/fasta/incremental_expectations.dart b/pkg/front_end/test/fasta/incremental_expectations.dart
index 6ac7b34..9839f4d 100644
--- a/pkg/front_end/test/fasta/incremental_expectations.dart
+++ b/pkg/front_end/test/fasta/incremental_expectations.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.test.incremental_expectations;
import "dart:convert" show JsonDecoder, JsonEncoder;
diff --git a/pkg/front_end/test/fasta/incremental_hello_test.dart b/pkg/front_end/test/fasta/incremental_hello_test.dart
index f7435f6..4e10f32 100644
--- a/pkg/front_end/test/fasta/incremental_hello_test.dart
+++ b/pkg/front_end/test/fasta/incremental_hello_test.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.md file.
+// @dart = 2.9
+
library fasta.test.incremental_dynamic_test;
import 'package:async_helper/async_helper.dart' show asyncTest;
diff --git a/pkg/front_end/test/fasta/incremental_source_files.dart b/pkg/front_end/test/fasta/incremental_source_files.dart
index c6d6931..4108b62 100644
--- a/pkg/front_end/test/fasta/incremental_source_files.dart
+++ b/pkg/front_end/test/fasta/incremental_source_files.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.md file.
+// @dart = 2.9
+
library fasta.test.incremental_source_files;
/// Expand a file with diffs in common merge conflict format into a [List] that
diff --git a/pkg/front_end/test/fasta/incremental_suite.dart b/pkg/front_end/test/fasta/incremental_suite.dart
index 46c13e9..0fc4330 100644
--- a/pkg/front_end/test/fasta/incremental_suite.dart
+++ b/pkg/front_end/test/fasta/incremental_suite.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.md file.
+// @dart = 2.9
+
library fasta.test.incremental_test;
import "dart:convert" show JsonEncoder;
diff --git a/pkg/front_end/test/fasta/link_test.dart b/pkg/front_end/test/fasta/link_test.dart
index 1eec73e..a0b7b06 100644
--- a/pkg/front_end/test/fasta/link_test.dart
+++ b/pkg/front_end/test/fasta/link_test.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:_fe_analyzer_shared/src/util/link.dart' show Link, LinkBuilder;
import 'package:expect/expect.dart' show Expect;
diff --git a/pkg/front_end/test/fasta/messages_suite.dart b/pkg/front_end/test/fasta/messages_suite.dart
index 8e04b81..9795ed4 100644
--- a/pkg/front_end/test/fasta/messages_suite.dart
+++ b/pkg/front_end/test/fasta/messages_suite.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:convert" show utf8;
import 'dart:io' show File, Platform;
diff --git a/pkg/front_end/test/fasta/object_supertype_test.dart b/pkg/front_end/test/fasta/object_supertype_test.dart
index 1f37142..d6e0ae6 100644
--- a/pkg/front_end/test/fasta/object_supertype_test.dart
+++ b/pkg/front_end/test/fasta/object_supertype_test.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:convert" show json;
import "package:_fe_analyzer_shared/src/messages/diagnostic_message.dart"
diff --git a/pkg/front_end/test/fasta/outline_suite.dart b/pkg/front_end/test/fasta/outline_suite.dart
index 4bb4b58..0c9fbfd 100644
--- a/pkg/front_end/test/fasta/outline_suite.dart
+++ b/pkg/front_end/test/fasta/outline_suite.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.md file.
+// @dart = 2.9
+
library fasta.test.outline_test;
import 'testing/suite.dart';
diff --git a/pkg/front_end/test/fasta/parser/literal_entry_info_test.dart b/pkg/front_end/test/fasta/parser/literal_entry_info_test.dart
index 8e0033f..791ecbe 100644
--- a/pkg/front_end/test/fasta/parser/literal_entry_info_test.dart
+++ b/pkg/front_end/test/fasta/parser/literal_entry_info_test.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:_fe_analyzer_shared/src/parser/parser.dart';
import 'package:_fe_analyzer_shared/src/parser/async_modifier.dart';
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart';
diff --git a/pkg/front_end/test/fasta/parser/parser_suite.dart b/pkg/front_end/test/fasta/parser/parser_suite.dart
index 8ea1ada..9c9f13a 100644
--- a/pkg/front_end/test/fasta/parser/parser_suite.dart
+++ b/pkg/front_end/test/fasta/parser/parser_suite.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.md file.
+// @dart = 2.9
+
import 'package:_fe_analyzer_shared/src/parser/parser.dart'
show ParserError, parse;
diff --git a/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart b/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
index 5445a78..3d26339 100644
--- a/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
+++ b/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.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:_fe_analyzer_shared/src/parser/token_stream_rewriter.dart';
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart'
show ScannerResult, scanString;
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 3536cb4..a14f5e0 100644
--- a/pkg/front_end/test/fasta/parser/type_info_test.dart
+++ b/pkg/front_end/test/fasta/parser/type_info_test.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:_fe_analyzer_shared/src/parser/parser.dart';
import 'package:_fe_analyzer_shared/src/parser/type_info.dart';
import 'package:_fe_analyzer_shared/src/parser/type_info_impl.dart';
diff --git a/pkg/front_end/test/fasta/reexport_test.dart b/pkg/front_end/test/fasta/reexport_test.dart
index 62112e0..c754291 100644
--- a/pkg/front_end/test/fasta/reexport_test.dart
+++ b/pkg/front_end/test/fasta/reexport_test.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:async_helper/async_helper.dart" show asyncTest;
import "package:front_end/src/testing/compiler_common.dart" show compileUnit;
diff --git a/pkg/front_end/test/fasta/scanner/scanner_suite.dart b/pkg/front_end/test/fasta/scanner/scanner_suite.dart
index e71149e..7039a40 100644
--- a/pkg/front_end/test/fasta/scanner/scanner_suite.dart
+++ b/pkg/front_end/test/fasta/scanner/scanner_suite.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.md file.
+// @dart = 2.9
+
import 'package:testing/testing.dart' show Chain, ChainContext, Step, runMe;
import '../../utils/scanner_chain.dart' show Read, Scan;
diff --git a/pkg/front_end/test/fasta/sdk_test.dart b/pkg/front_end/test/fasta/sdk_test.dart
index 27073c4..00d03a6 100644
--- a/pkg/front_end/test/fasta/sdk_test.dart
+++ b/pkg/front_end/test/fasta/sdk_test.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.md file.
+// @dart = 2.9
+
library fasta.test.sdk_test;
import 'testing/suite.dart';
diff --git a/pkg/front_end/test/fasta/strong1_suite.dart b/pkg/front_end/test/fasta/strong1_suite.dart
index cb30b7e..7fbcb8d 100644
--- a/pkg/front_end/test/fasta/strong1_suite.dart
+++ b/pkg/front_end/test/fasta/strong1_suite.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.md file.
+// @dart = 2.9
+
import 'strong_tester.dart';
main(List<String> arguments) {
diff --git a/pkg/front_end/test/fasta/strong2_suite.dart b/pkg/front_end/test/fasta/strong2_suite.dart
index 10fafaf..311509b 100644
--- a/pkg/front_end/test/fasta/strong2_suite.dart
+++ b/pkg/front_end/test/fasta/strong2_suite.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.md file.
+// @dart = 2.9
+
import 'strong_tester.dart';
main(List<String> arguments) {
diff --git a/pkg/front_end/test/fasta/strong3_suite.dart b/pkg/front_end/test/fasta/strong3_suite.dart
index 044c7e8..5bb5913 100644
--- a/pkg/front_end/test/fasta/strong3_suite.dart
+++ b/pkg/front_end/test/fasta/strong3_suite.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.md file.
+// @dart = 2.9
+
import 'strong_tester.dart';
main(List<String> arguments) {
diff --git a/pkg/front_end/test/fasta/strong4_suite.dart b/pkg/front_end/test/fasta/strong4_suite.dart
index 9e459e3..9db4367 100644
--- a/pkg/front_end/test/fasta/strong4_suite.dart
+++ b/pkg/front_end/test/fasta/strong4_suite.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.md file.
+// @dart = 2.9
+
import 'strong_tester.dart';
main(List<String> arguments) {
diff --git a/pkg/front_end/test/fasta/strong_tester.dart b/pkg/front_end/test/fasta/strong_tester.dart
index 83d9ab3..c514438 100644
--- a/pkg/front_end/test/fasta/strong_tester.dart
+++ b/pkg/front_end/test/fasta/strong_tester.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.md file.
+// @dart = 2.9
+
library fasta.test.strong_test;
import 'dart:io' show Platform;
diff --git a/pkg/front_end/test/fasta/super_mixins_test.dart b/pkg/front_end/test/fasta/super_mixins_test.dart
index c776f0a..ecfe1c9 100644
--- a/pkg/front_end/test/fasta/super_mixins_test.dart
+++ b/pkg/front_end/test/fasta/super_mixins_test.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.md file.
+// @dart = 2.9
+
library fasta.test.incremental_dynamic_test;
import "package:_fe_analyzer_shared/src/messages/diagnostic_message.dart"
diff --git a/pkg/front_end/test/fasta/testing/suite.dart b/pkg/front_end/test/fasta/testing/suite.dart
index 0dd5247..e52916f 100644
--- a/pkg/front_end/test/fasta/testing/suite.dart
+++ b/pkg/front_end/test/fasta/testing/suite.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.md file.
+// @dart = 2.9
+
library fasta.testing.suite;
import 'dart:convert' show jsonDecode;
diff --git a/pkg/front_end/test/fasta/text_serialization1_suite.dart b/pkg/front_end/test/fasta/text_serialization1_suite.dart
index 1a9ba5e..bccfbcd 100644
--- a/pkg/front_end/test/fasta/text_serialization1_suite.dart
+++ b/pkg/front_end/test/fasta/text_serialization1_suite.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.md file.
+// @dart = 2.9
+
import 'text_serialization_tester.dart';
main(List<String> arguments) {
diff --git a/pkg/front_end/test/fasta/text_serialization2_suite.dart b/pkg/front_end/test/fasta/text_serialization2_suite.dart
index b922a21..8b5b2ca 100644
--- a/pkg/front_end/test/fasta/text_serialization2_suite.dart
+++ b/pkg/front_end/test/fasta/text_serialization2_suite.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.md file.
+// @dart = 2.9
+
import 'text_serialization_tester.dart';
main(List<String> arguments) {
diff --git a/pkg/front_end/test/fasta/text_serialization3_suite.dart b/pkg/front_end/test/fasta/text_serialization3_suite.dart
index f14949c5..682d486 100644
--- a/pkg/front_end/test/fasta/text_serialization3_suite.dart
+++ b/pkg/front_end/test/fasta/text_serialization3_suite.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.md file.
+// @dart = 2.9
+
import 'text_serialization_tester.dart';
main(List<String> arguments) {
diff --git a/pkg/front_end/test/fasta/text_serialization4_suite.dart b/pkg/front_end/test/fasta/text_serialization4_suite.dart
index 9807292..c6043fc 100644
--- a/pkg/front_end/test/fasta/text_serialization4_suite.dart
+++ b/pkg/front_end/test/fasta/text_serialization4_suite.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.md file.
+// @dart = 2.9
+
import 'text_serialization_tester.dart';
main(List<String> arguments) {
diff --git a/pkg/front_end/test/fasta/text_serialization_tester.dart b/pkg/front_end/test/fasta/text_serialization_tester.dart
index 13ee181..25c4081 100644
--- a/pkg/front_end/test/fasta/text_serialization_tester.dart
+++ b/pkg/front_end/test/fasta/text_serialization_tester.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.md file.
+// @dart = 2.9
+
library fasta.test.text_serialization_test;
import 'dart:io' show Platform;
diff --git a/pkg/front_end/test/fasta/textual_outline_suite.dart b/pkg/front_end/test/fasta/textual_outline_suite.dart
index 8e38277..7688f80 100644
--- a/pkg/front_end/test/fasta/textual_outline_suite.dart
+++ b/pkg/front_end/test/fasta/textual_outline_suite.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.md file.
+// @dart = 2.9
+
library fasta.test.textual_outline_test;
import 'dart:io';
diff --git a/pkg/front_end/test/fasta/tool_test.dart b/pkg/front_end/test/fasta/tool_test.dart
index fe44a8b..6f77ade 100644
--- a/pkg/front_end/test/fasta/tool_test.dart
+++ b/pkg/front_end/test/fasta/tool_test.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
+
/// Tests the tool `pkg/front_end/tool/fasta`.
import "dart:io";
diff --git a/pkg/front_end/test/fasta/type_inference/factor_type_test.dart b/pkg/front_end/test/fasta/type_inference/factor_type_test.dart
index f68d6d5..aec0ef1 100644
--- a/pkg/front_end/test/fasta/type_inference/factor_type_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/factor_type_test.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:_fe_analyzer_shared/src/flow_analysis/factory_type_test_helper.dart';
import 'package:expect/expect.dart';
import 'package:front_end/src/api_prototype/compiler_options.dart';
diff --git a/pkg/front_end/test/fasta/type_inference/type_constraint_gatherer_nnbd_test.dart b/pkg/front_end/test/fasta/type_inference/type_constraint_gatherer_nnbd_test.dart
index 9bc5b5d..889f6c6 100644
--- a/pkg/front_end/test/fasta/type_inference/type_constraint_gatherer_nnbd_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/type_constraint_gatherer_nnbd_test.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:front_end/src/fasta/type_inference/type_constraint_gatherer.dart';
import 'package:front_end/src/fasta/type_inference/type_schema.dart';
import 'package:front_end/src/fasta/type_inference/type_schema_environment.dart';
diff --git a/pkg/front_end/test/fasta/type_inference/type_constraint_gatherer_test.dart b/pkg/front_end/test/fasta/type_inference/type_constraint_gatherer_test.dart
index d690cba..ec32ecf 100644
--- a/pkg/front_end/test/fasta/type_inference/type_constraint_gatherer_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/type_constraint_gatherer_test.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:front_end/src/fasta/type_inference/type_constraint_gatherer.dart';
import 'package:front_end/src/fasta/type_inference/type_schema.dart';
import 'package:front_end/src/fasta/type_inference/type_schema_environment.dart';
diff --git a/pkg/front_end/test/fasta/type_inference/type_inference_engine_test.dart b/pkg/front_end/test/fasta/type_inference/type_inference_engine_test.dart
index a804319..1f063e3 100644
--- a/pkg/front_end/test/fasta/type_inference/type_inference_engine_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/type_inference_engine_test.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:front_end/src/fasta/type_inference/type_inference_engine.dart';
import 'package:kernel/ast.dart';
import 'package:test/test.dart';
diff --git a/pkg/front_end/test/fasta/type_inference/type_schema_elimination_nnbd_test.dart b/pkg/front_end/test/fasta/type_inference/type_schema_elimination_nnbd_test.dart
index aa491cc..1643d2f 100644
--- a/pkg/front_end/test/fasta/type_inference/type_schema_elimination_nnbd_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/type_schema_elimination_nnbd_test.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:front_end/src/fasta/type_inference/type_schema.dart';
import 'package:front_end/src/fasta/type_inference/type_schema_elimination.dart'
as typeSchemaElimination;
diff --git a/pkg/front_end/test/fasta/type_inference/type_schema_elimination_test.dart b/pkg/front_end/test/fasta/type_inference/type_schema_elimination_test.dart
index 3d30f92..55e7235 100644
--- a/pkg/front_end/test/fasta/type_inference/type_schema_elimination_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/type_schema_elimination_test.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:front_end/src/fasta/type_inference/type_schema.dart';
import 'package:front_end/src/fasta/type_inference/type_schema_elimination.dart'
as typeSchemaElimination;
diff --git a/pkg/front_end/test/fasta/type_inference/type_schema_environment_nnbd_test.dart b/pkg/front_end/test/fasta/type_inference/type_schema_environment_nnbd_test.dart
index 5818a50..68f81d6 100644
--- a/pkg/front_end/test/fasta/type_inference/type_schema_environment_nnbd_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/type_schema_environment_nnbd_test.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:front_end/src/fasta/type_inference/type_schema.dart';
import 'package:front_end/src/fasta/type_inference/type_schema_environment.dart';
import 'package:kernel/ast.dart';
diff --git a/pkg/front_end/test/fasta/type_inference/type_schema_environment_test.dart b/pkg/front_end/test/fasta/type_inference/type_schema_environment_test.dart
index e57d799..7f6b961 100644
--- a/pkg/front_end/test/fasta/type_inference/type_schema_environment_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/type_schema_environment_test.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:front_end/src/fasta/type_inference/type_schema.dart';
import 'package:front_end/src/fasta/type_inference/type_schema_environment.dart';
import 'package:kernel/ast.dart';
diff --git a/pkg/front_end/test/fasta/type_inference/type_schema_test.dart b/pkg/front_end/test/fasta/type_inference/type_schema_test.dart
index 8c6f5a2..2891915 100644
--- a/pkg/front_end/test/fasta/type_inference/type_schema_test.dart
+++ b/pkg/front_end/test/fasta/type_inference/type_schema_test.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:front_end/src/fasta/type_inference/type_schema.dart';
import 'package:kernel/ast.dart';
import 'package:kernel/visitor.dart';
diff --git a/pkg/front_end/test/fasta/types/dart2js_benchmark.dart b/pkg/front_end/test/fasta/types/dart2js_benchmark.dart
index 414a69a..7ef67e3 100644
--- a/pkg/front_end/test/fasta/types/dart2js_benchmark.dart
+++ b/pkg/front_end/test/fasta/types/dart2js_benchmark.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:io" show Platform;
import "subtypes_benchmark.dart" show run;
diff --git a/pkg/front_end/test/fasta/types/dart2js_benchmark_test.dart b/pkg/front_end/test/fasta/types/dart2js_benchmark_test.dart
index 551647d..b3084ea 100644
--- a/pkg/front_end/test/fasta/types/dart2js_benchmark_test.dart
+++ b/pkg/front_end/test/fasta/types/dart2js_benchmark_test.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 "dart2js_benchmark.dart" as bench show main;
main() => bench.main();
diff --git a/pkg/front_end/test/fasta/types/dill_hierachy_test.dart b/pkg/front_end/test/fasta/types/dill_hierachy_test.dart
index 3250327..a5bd0e4 100644
--- a/pkg/front_end/test/fasta/types/dill_hierachy_test.dart
+++ b/pkg/front_end/test/fasta/types/dill_hierachy_test.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:async_helper/async_helper.dart" show asyncTest;
import "package:expect/expect.dart" show Expect;
diff --git a/pkg/front_end/test/fasta/types/fasta_legacy_upper_bound_test.dart b/pkg/front_end/test/fasta/types/fasta_legacy_upper_bound_test.dart
index b1ac139..653a912 100644
--- a/pkg/front_end/test/fasta/types/fasta_legacy_upper_bound_test.dart
+++ b/pkg/front_end/test/fasta/types/fasta_legacy_upper_bound_test.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" show DartType, Library;
import "package:kernel/target/targets.dart" show NoneTarget, TargetFlags;
diff --git a/pkg/front_end/test/fasta/types/fasta_types_test.dart b/pkg/front_end/test/fasta/types/fasta_types_test.dart
index bfbde70..25778ab 100644
--- a/pkg/front_end/test/fasta/types/fasta_types_test.dart
+++ b/pkg/front_end/test/fasta/types/fasta_types_test.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:async_helper/async_helper.dart" show asyncTest;
import "package:kernel/ast.dart" show Component, DartType;
diff --git a/pkg/front_end/test/fasta/types/hashcode_test.dart b/pkg/front_end/test/fasta/types/hashcode_test.dart
index 404d446..e27c2fe 100644
--- a/pkg/front_end/test/fasta/types/hashcode_test.dart
+++ b/pkg/front_end/test/fasta/types/hashcode_test.dart
@@ -1,3 +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.md file.
+
+// @dart = 2.9
+
import 'package:expect/expect.dart';
import 'package:kernel/kernel.dart';
diff --git a/pkg/front_end/test/fasta/types/kernel_legacy_upper_bound_test.dart b/pkg/front_end/test/fasta/types/kernel_legacy_upper_bound_test.dart
index e353327..cddafb7 100644
--- a/pkg/front_end/test/fasta/types/kernel_legacy_upper_bound_test.dart
+++ b/pkg/front_end/test/fasta/types/kernel_legacy_upper_bound_test.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 "legacy_upper_bound_helper.dart" show LegacyUpperBoundTest;
import "package:kernel/ast.dart" show DartType, Library;
diff --git a/pkg/front_end/test/fasta/types/kernel_type_parser_test.dart b/pkg/front_end/test/fasta/types/kernel_type_parser_test.dart
index fef974e..8d54c8a 100644
--- a/pkg/front_end/test/fasta/types/kernel_type_parser_test.dart
+++ b/pkg/front_end/test/fasta/types/kernel_type_parser_test.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:expect/expect.dart" show Expect;
import "package:kernel/ast.dart" show Component, DartType, Library;
diff --git a/pkg/front_end/test/fasta/types/large_app_benchmark.dart b/pkg/front_end/test/fasta/types/large_app_benchmark.dart
index 94a5601..45e9417 100644
--- a/pkg/front_end/test/fasta/types/large_app_benchmark.dart
+++ b/pkg/front_end/test/fasta/types/large_app_benchmark.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:io" show Platform;
import "subtypes_benchmark.dart" show run;
diff --git a/pkg/front_end/test/fasta/types/large_app_benchmark_test.dart b/pkg/front_end/test/fasta/types/large_app_benchmark_test.dart
index 4dca6c8..4dc83be 100644
--- a/pkg/front_end/test/fasta/types/large_app_benchmark_test.dart
+++ b/pkg/front_end/test/fasta/types/large_app_benchmark_test.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 "large_app_benchmark.dart" as bench show main;
main() => bench.main();
diff --git a/pkg/front_end/test/fasta/types/legacy_upper_bound_helper.dart b/pkg/front_end/test/fasta/types/legacy_upper_bound_helper.dart
index 5a50c9e..3d4c7d6 100644
--- a/pkg/front_end/test/fasta/types/legacy_upper_bound_helper.dart
+++ b/pkg/front_end/test/fasta/types/legacy_upper_bound_helper.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:async_helper/async_helper.dart" show asyncTest;
import "package:expect/expect.dart" show Expect;
diff --git a/pkg/front_end/test/fasta/types/shared_type_tests.dart b/pkg/front_end/test/fasta/types/shared_type_tests.dart
index fa1d750..fc8f7e3 100644
--- a/pkg/front_end/test/fasta/types/shared_type_tests.dart
+++ b/pkg/front_end/test/fasta/types/shared_type_tests.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:expect/expect.dart" show Expect;
import "package:kernel/type_environment.dart";
diff --git a/pkg/front_end/test/fasta/types/subtypes_benchmark.dart b/pkg/front_end/test/fasta/types/subtypes_benchmark.dart
index 8a81b61..ef6dfb0 100644
--- a/pkg/front_end/test/fasta/types/subtypes_benchmark.dart
+++ b/pkg/front_end/test/fasta/types/subtypes_benchmark.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:convert" show json, utf8;
import "dart:io" show File, gzip;
diff --git a/pkg/front_end/test/fasta/uri_translator_test.dart b/pkg/front_end/test/fasta/uri_translator_test.dart
index 9d29352..15733f8 100644
--- a/pkg/front_end/test/fasta/uri_translator_test.dart
+++ b/pkg/front_end/test/fasta/uri_translator_test.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:front_end/src/base/libraries_specification.dart';
import 'package:front_end/src/fasta/uri_translator.dart';
import 'package:package_config/package_config.dart';
diff --git a/pkg/front_end/test/fasta/util/direct_parser_ast_test.dart b/pkg/front_end/test/fasta/util/direct_parser_ast_test.dart
index 4f2c82f..aab38dd 100644
--- a/pkg/front_end/test/fasta/util/direct_parser_ast_test.dart
+++ b/pkg/front_end/test/fasta/util/direct_parser_ast_test.dart
@@ -1,3 +1,9 @@
+// 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.md file.
+
+// @dart = 2.9
+
import 'dart:convert';
import 'dart:io';
diff --git a/pkg/front_end/test/fasta/weak_suite.dart b/pkg/front_end/test/fasta/weak_suite.dart
index 604a480..ec9df5e 100644
--- a/pkg/front_end/test/fasta/weak_suite.dart
+++ b/pkg/front_end/test/fasta/weak_suite.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.md file.
+// @dart = 2.9
+
library fasta.test.weak_test;
import 'testing/suite.dart';
diff --git a/pkg/front_end/test/ffi_test.dart b/pkg/front_end/test/ffi_test.dart
index f032f75..b617fa0 100644
--- a/pkg/front_end/test/ffi_test.dart
+++ b/pkg/front_end/test/ffi_test.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:expect/expect.dart';
main() {
diff --git a/pkg/front_end/test/flutter_gallery_leak_tester.dart b/pkg/front_end/test/flutter_gallery_leak_tester.dart
index fa3a949..37b66be 100644
--- a/pkg/front_end/test/flutter_gallery_leak_tester.dart
+++ b/pkg/front_end/test/flutter_gallery_leak_tester.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:async';
import 'dart:convert';
import 'dart:io';
diff --git a/pkg/front_end/test/hot_reload_e2e_test.dart b/pkg/front_end/test/hot_reload_e2e_test.dart
index eb41174..419354b 100644
--- a/pkg/front_end/test/hot_reload_e2e_test.dart
+++ b/pkg/front_end/test/hot_reload_e2e_test.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
+
/// Integration test that runs the incremental compiler, runs the compiled
/// program, incrementally rebuild portions of the app, and triggers a hot
/// reload on the running program.
diff --git a/pkg/front_end/test/id_testing/data/library_with_name.dart b/pkg/front_end/test/id_testing/data/library_with_name.dart
index cd9b07e..fabca66 100644
--- a/pkg/front_end/test/id_testing/data/library_with_name.dart
+++ b/pkg/front_end/test/id_testing/data/library_with_name.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: file=main.dart,name=lib*/
library lib;
diff --git a/pkg/front_end/test/id_testing/id_testing_test.dart b/pkg/front_end/test/id_testing/id_testing_test.dart
index 6de53f5..590515a 100644
--- a/pkg/front_end/test/id_testing/id_testing_test.dart
+++ b/pkg/front_end/test/id_testing/id_testing_test.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:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
show DataInterpreter, StringDataInterpreter, runTests;
diff --git a/pkg/front_end/test/id_tests/assigned_variables_test.dart b/pkg/front_end/test/id_tests/assigned_variables_test.dart
index 51832e2..b0a7d7a 100644
--- a/pkg/front_end/test/id_tests/assigned_variables_test.dart
+++ b/pkg/front_end/test/id_tests/assigned_variables_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/flow_analysis/flow_analysis.dart';
diff --git a/pkg/front_end/test/id_tests/constant_test.dart b/pkg/front_end/test/id_tests/constant_test.dart
index 8de3c2e..3091acf 100644
--- a/pkg/front_end/test/id_tests/constant_test.dart
+++ b/pkg/front_end/test/id_tests/constant_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/id_tests/definite_assignment_test.dart b/pkg/front_end/test/id_tests/definite_assignment_test.dart
index 68b66ed..5dd584d 100644
--- a/pkg/front_end/test/id_tests/definite_assignment_test.dart
+++ b/pkg/front_end/test/id_tests/definite_assignment_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/id_tests/definite_unassignment_test.dart b/pkg/front_end/test/id_tests/definite_unassignment_test.dart
index b22affb..fdc8ce2 100644
--- a/pkg/front_end/test/id_tests/definite_unassignment_test.dart
+++ b/pkg/front_end/test/id_tests/definite_unassignment_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/id_tests/inheritance_test.dart b/pkg/front_end/test/id_tests/inheritance_test.dart
index f39b8d2..261efa6 100644
--- a/pkg/front_end/test/id_tests/inheritance_test.dart
+++ b/pkg/front_end/test/id_tests/inheritance_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart';
diff --git a/pkg/front_end/test/id_tests/nullability_test.dart b/pkg/front_end/test/id_tests/nullability_test.dart
index 7b1e603..4980ffb 100644
--- a/pkg/front_end/test/id_tests/nullability_test.dart
+++ b/pkg/front_end/test/id_tests/nullability_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/id_tests/reachability_test.dart b/pkg/front_end/test/id_tests/reachability_test.dart
index 1cdf867..cf37a57 100644
--- a/pkg/front_end/test/id_tests/reachability_test.dart
+++ b/pkg/front_end/test/id_tests/reachability_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/id_tests/type_promotion_test.dart b/pkg/front_end/test/id_tests/type_promotion_test.dart
index 5e963c7..1ac5fb3 100644
--- a/pkg/front_end/test/id_tests/type_promotion_test.dart
+++ b/pkg/front_end/test/id_tests/type_promotion_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/incremental_bulk_compiler_full.dart b/pkg/front_end/test/incremental_bulk_compiler_full.dart
index 03ac980..ac018cb 100644
--- a/pkg/front_end/test/incremental_bulk_compiler_full.dart
+++ b/pkg/front_end/test/incremental_bulk_compiler_full.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:expect/expect.dart' show Expect;
import 'package:front_end/src/api_prototype/compiler_options.dart'
diff --git a/pkg/front_end/test/incremental_bulk_compiler_smoke_suite.dart b/pkg/front_end/test/incremental_bulk_compiler_smoke_suite.dart
index 28f3352..98f1f3b 100644
--- a/pkg/front_end/test/incremental_bulk_compiler_smoke_suite.dart
+++ b/pkg/front_end/test/incremental_bulk_compiler_smoke_suite.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:testing/testing.dart' show Chain, runMe;
import 'incremental_bulk_compiler_full.dart' show Context;
diff --git a/pkg/front_end/test/incremental_compiler_leak_test.dart b/pkg/front_end/test/incremental_compiler_leak_test.dart
index 9cefae5..d304ccb 100644
--- a/pkg/front_end/test/incremental_compiler_leak_test.dart
+++ b/pkg/front_end/test/incremental_compiler_leak_test.dart
@@ -1,3 +1,9 @@
+// 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.md file.
+
+// @dart = 2.9
+
import 'dart:async';
import 'dart:io';
diff --git a/pkg/front_end/test/incremental_dart2js_load_from_dill_test.dart b/pkg/front_end/test/incremental_dart2js_load_from_dill_test.dart
index 844ecd5..13eaccb 100644
--- a/pkg/front_end/test/incremental_dart2js_load_from_dill_test.dart
+++ b/pkg/front_end/test/incremental_dart2js_load_from_dill_test.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:io' show Directory, File;
import 'package:expect/expect.dart' show Expect;
diff --git a/pkg/front_end/test/incremental_dart2js_test.dart b/pkg/front_end/test/incremental_dart2js_test.dart
index 1ea9b17..5fef9dc 100644
--- a/pkg/front_end/test/incremental_dart2js_test.dart
+++ b/pkg/front_end/test/incremental_dart2js_test.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 "incremental_dart2js_tester.dart";
main(List<String> args) async {
diff --git a/pkg/front_end/test/incremental_dart2js_tester.dart b/pkg/front_end/test/incremental_dart2js_tester.dart
index 05b5538..8cadcc1 100644
--- a/pkg/front_end/test/incremental_dart2js_tester.dart
+++ b/pkg/front_end/test/incremental_dart2js_tester.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:developer";
import 'dart:io' show Platform;
diff --git a/pkg/front_end/test/incremental_flutter_tester.dart b/pkg/front_end/test/incremental_flutter_tester.dart
index 4d2aa12..10bb00e 100644
--- a/pkg/front_end/test/incremental_flutter_tester.dart
+++ b/pkg/front_end/test/incremental_flutter_tester.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:io' show Directory, File, exit;
import 'package:front_end/src/api_prototype/compiler_options.dart'
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 84c74bc..371df29 100644
--- a/pkg/front_end/test/incremental_load_from_dill_suite.dart
+++ b/pkg/front_end/test/incremental_load_from_dill_suite.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:developer' show debugger;
import 'dart:io' show Directory, File;
diff --git a/pkg/front_end/test/incremental_load_from_invalid_dill_test.dart b/pkg/front_end/test/incremental_load_from_invalid_dill_test.dart
index 1f8b19a..6f1bc12 100644
--- a/pkg/front_end/test/incremental_load_from_invalid_dill_test.dart
+++ b/pkg/front_end/test/incremental_load_from_invalid_dill_test.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:io' show File;
import 'package:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
diff --git a/pkg/front_end/test/incremental_utils.dart b/pkg/front_end/test/incremental_utils.dart
index f91e823..0d7251b 100644
--- a/pkg/front_end/test/incremental_utils.dart
+++ b/pkg/front_end/test/incremental_utils.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:convert' show utf8;
import "package:front_end/src/api_prototype/file_system.dart" show FileSystem;
diff --git a/pkg/front_end/test/issue_34856_test.dart b/pkg/front_end/test/issue_34856_test.dart
index 7e78eb1..8d41b6f 100644
--- a/pkg/front_end/test/issue_34856_test.dart
+++ b/pkg/front_end/test/issue_34856_test.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:io' show File;
import 'package:async_helper/async_helper.dart' show asyncTest;
diff --git a/pkg/front_end/test/kernel_generator_test.dart b/pkg/front_end/test/kernel_generator_test.dart
index 20e3b57..209e853 100644
--- a/pkg/front_end/test/kernel_generator_test.dart
+++ b/pkg/front_end/test/kernel_generator_test.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'
show EmptyStatement, Component, ReturnStatement, StaticInvocation;
diff --git a/pkg/front_end/test/language_versioning/language_versioning_test.dart b/pkg/front_end/test/language_versioning/language_versioning_test.dart
index b44c90d..912905c 100644
--- a/pkg/front_end/test/language_versioning/language_versioning_test.dart
+++ b/pkg/front_end/test/language_versioning/language_versioning_test.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:io' show Directory, File, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
import 'package:_fe_analyzer_shared/src/testing/features.dart';
diff --git a/pkg/front_end/test/language_versioning/language_versioning_up_to_date_test.dart b/pkg/front_end/test/language_versioning/language_versioning_up_to_date_test.dart
index 3e20772..16a442b 100644
--- a/pkg/front_end/test/language_versioning/language_versioning_up_to_date_test.dart
+++ b/pkg/front_end/test/language_versioning/language_versioning_up_to_date_test.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:io' show Platform, Process, ProcessResult;
import 'package:front_end/src/api_prototype/compiler_options.dart';
diff --git a/pkg/front_end/test/lint_suite.dart b/pkg/front_end/test/lint_suite.dart
index 8547196..d5b0da7 100644
--- a/pkg/front_end/test/lint_suite.dart
+++ b/pkg/front_end/test/lint_suite.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:io' show Directory, File, FileSystemEntity;
import 'dart:typed_data' show Uint8List;
diff --git a/pkg/front_end/test/member_covariance_test.dart b/pkg/front_end/test/member_covariance_test.dart
index 6f541df..62d44a3 100644
--- a/pkg/front_end/test/member_covariance_test.dart
+++ b/pkg/front_end/test/member_covariance_test.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:expect/expect.dart';
import 'package:front_end/src/fasta/kernel/kernel_ast_api.dart';
import 'package:front_end/src/fasta/kernel/member_covariance.dart';
diff --git a/pkg/front_end/test/memory_file_system_test.dart b/pkg/front_end/test/memory_file_system_test.dart
index 4364582..802eace7 100644
--- a/pkg/front_end/test/memory_file_system_test.dart
+++ b/pkg/front_end/test/memory_file_system_test.dart
@@ -3,6 +3,8 @@
// BSD-style license that can be found in the LICENSE file.
// SharedOptions=--supermixin
+// @dart = 2.9
+
library front_end.test.memory_file_system_test;
import 'dart:convert';
diff --git a/pkg/front_end/test/messages_json_test.dart b/pkg/front_end/test/messages_json_test.dart
index 55c6e76..e8fe28a 100644
--- a/pkg/front_end/test/messages_json_test.dart
+++ b/pkg/front_end/test/messages_json_test.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:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
show DiagnosticMessage, getMessageUri;
diff --git a/pkg/front_end/test/mixin_export_test.dart b/pkg/front_end/test/mixin_export_test.dart
index bf97cc2..6b75f19 100644
--- a/pkg/front_end/test/mixin_export_test.dart
+++ b/pkg/front_end/test/mixin_export_test.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:async_helper/async_helper.dart' show asyncTest;
import 'package:front_end/src/testing/compiler_common.dart';
diff --git a/pkg/front_end/test/packages_format_error_test.dart b/pkg/front_end/test/packages_format_error_test.dart
index 14f97c8..7514228 100644
--- a/pkg/front_end/test/packages_format_error_test.dart
+++ b/pkg/front_end/test/packages_format_error_test.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:_fe_analyzer_shared/src/messages/diagnostic_message.dart'
show DiagnosticMessage, getMessageCodeObject;
diff --git a/pkg/front_end/test/parser_all_suite.dart b/pkg/front_end/test/parser_all_suite.dart
index 9b60aae..837567f 100644
--- a/pkg/front_end/test/parser_all_suite.dart
+++ b/pkg/front_end/test/parser_all_suite.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:testing/testing.dart' show Chain, ChainContext, runMe;
import 'parser_suite.dart';
diff --git a/pkg/front_end/test/parser_suite.dart b/pkg/front_end/test/parser_suite.dart
index 3bc79a2..6221db7 100644
--- a/pkg/front_end/test/parser_suite.dart
+++ b/pkg/front_end/test/parser_suite.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:convert' show jsonDecode;
import 'dart:io' show File;
diff --git a/pkg/front_end/test/parser_test_listener_creator.dart b/pkg/front_end/test/parser_test_listener_creator.dart
index 18c2152..787e7f6 100644
--- a/pkg/front_end/test/parser_test_listener_creator.dart
+++ b/pkg/front_end/test/parser_test_listener_creator.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:io';
import 'dart:typed_data';
diff --git a/pkg/front_end/test/parser_test_parser.dart b/pkg/front_end/test/parser_test_parser.dart
index 8033a37..fd3ed9b 100644
--- a/pkg/front_end/test/parser_test_parser.dart
+++ b/pkg/front_end/test/parser_test_parser.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:_fe_analyzer_shared/src/parser/assert.dart';
import 'package:_fe_analyzer_shared/src/parser/block_kind.dart';
import 'package:_fe_analyzer_shared/src/parser/declaration_kind.dart';
diff --git a/pkg/front_end/test/parser_test_parser_creator.dart b/pkg/front_end/test/parser_test_parser_creator.dart
index aa1e573..d1ab0c5 100644
--- a/pkg/front_end/test/parser_test_parser_creator.dart
+++ b/pkg/front_end/test/parser_test_parser_creator.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:io';
import 'dart:typed_data';
diff --git a/pkg/front_end/test/patching/patching_test.dart b/pkg/front_end/test/patching/patching_test.dart
index 9e5e116..e22e19f 100644
--- a/pkg/front_end/test/patching/patching_test.dart
+++ b/pkg/front_end/test/patching/patching_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
diff --git a/pkg/front_end/test/precedence_info_test.dart b/pkg/front_end/test/precedence_info_test.dart
index 61244aa..fd88c3e 100644
--- a/pkg/front_end/test/precedence_info_test.dart
+++ b/pkg/front_end/test/precedence_info_test.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:_fe_analyzer_shared/src/scanner/scanner.dart';
import 'package:_fe_analyzer_shared/src/scanner/abstract_scanner.dart'
show AbstractScanner;
diff --git a/pkg/front_end/test/predicates/predicate_test.dart b/pkg/front_end/test/predicates/predicate_test.dart
index ffe5ec2..5d98cff 100644
--- a/pkg/front_end/test/predicates/predicate_test.dart
+++ b/pkg/front_end/test/predicates/predicate_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart';
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/read_dill_from_binary_md_test.dart b/pkg/front_end/test/read_dill_from_binary_md_test.dart
index 2331db5..fc73545 100644
--- a/pkg/front_end/test/read_dill_from_binary_md_test.dart
+++ b/pkg/front_end/test/read_dill_from_binary_md_test.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:io' show File, Platform;
import 'package:kernel/target/targets.dart' show NoneTarget, TargetFlags;
diff --git a/pkg/front_end/test/relativize_test.dart b/pkg/front_end/test/relativize_test.dart
index bc8a132..28c4acc 100644
--- a/pkg/front_end/test/relativize_test.dart
+++ b/pkg/front_end/test/relativize_test.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:_fe_analyzer_shared/src/util/relativize.dart';
import 'package:test/test.dart';
diff --git a/pkg/front_end/test/resolve_input_uri_test.dart b/pkg/front_end/test/resolve_input_uri_test.dart
index f8eda33..3705440 100644
--- a/pkg/front_end/test/resolve_input_uri_test.dart
+++ b/pkg/front_end/test/resolve_input_uri_test.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:_fe_analyzer_shared/src/util/relativize.dart';
import 'package:expect/expect.dart' show Expect;
import 'package:front_end/src/fasta/resolve_input_uri.dart';
diff --git a/pkg/front_end/test/scanner_fasta_test.dart b/pkg/front_end/test/scanner_fasta_test.dart
index 08f0bc6..7b59523 100644
--- a/pkg/front_end/test/scanner_fasta_test.dart
+++ b/pkg/front_end/test/scanner_fasta_test.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:convert';
import 'package:_fe_analyzer_shared/src/scanner/error_token.dart' as fasta;
diff --git a/pkg/front_end/test/scanner_replacement_test.dart b/pkg/front_end/test/scanner_replacement_test.dart
index a523793..867e68e 100644
--- a/pkg/front_end/test/scanner_replacement_test.dart
+++ b/pkg/front_end/test/scanner_replacement_test.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:_fe_analyzer_shared/src/scanner/scanner.dart' as fasta;
import 'package:_fe_analyzer_shared/src/scanner/token.dart' as fasta;
import 'package:_fe_analyzer_shared/src/scanner/error_token.dart' as fasta;
diff --git a/pkg/front_end/test/scanner_test.dart b/pkg/front_end/test/scanner_test.dart
index d6cdad2..4a62db4 100644
--- a/pkg/front_end/test/scanner_test.dart
+++ b/pkg/front_end/test/scanner_test.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:_fe_analyzer_shared/src/base/errors.dart';
import 'package:_fe_analyzer_shared/src/scanner/abstract_scanner.dart'
show AbstractScanner, ScannerConfiguration;
diff --git a/pkg/front_end/test/scheme_based_file_system_test.dart b/pkg/front_end/test/scheme_based_file_system_test.dart
index e6b374b..f5c018e 100644
--- a/pkg/front_end/test/scheme_based_file_system_test.dart
+++ b/pkg/front_end/test/scheme_based_file_system_test.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:front_end/src/api_prototype/file_system.dart';
import 'package:front_end/src/scheme_based_file_system.dart';
diff --git a/pkg/front_end/test/severity_index_test.dart b/pkg/front_end/test/severity_index_test.dart
index 2077e6d..8dc6f14 100644
--- a/pkg/front_end/test/severity_index_test.dart
+++ b/pkg/front_end/test/severity_index_test.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:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
/// Test that Severity has the expected indexes. Note that this is important
diff --git a/pkg/front_end/test/simple_stats.dart b/pkg/front_end/test/simple_stats.dart
index 062d59d..b163e67 100644
--- a/pkg/front_end/test/simple_stats.dart
+++ b/pkg/front_end/test/simple_stats.dart
@@ -1,3 +1,9 @@
+// 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.md file.
+
+// @dart = 2.9
+
import 'dart:math' as math;
class SimpleTTestStat {
diff --git a/pkg/front_end/test/spell_checking_cleanup_lists.dart b/pkg/front_end/test/spell_checking_cleanup_lists.dart
index af7d5bd..6f38991 100644
--- a/pkg/front_end/test/spell_checking_cleanup_lists.dart
+++ b/pkg/front_end/test/spell_checking_cleanup_lists.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:io';
import 'spell_checking_utils.dart' as spell;
diff --git a/pkg/front_end/test/spell_checking_utils.dart b/pkg/front_end/test/spell_checking_utils.dart
index b0f33a3..c08fb4c 100644
--- a/pkg/front_end/test/spell_checking_utils.dart
+++ b/pkg/front_end/test/spell_checking_utils.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:io' show File, stdin, stdout;
import "utils/io_utils.dart";
diff --git a/pkg/front_end/test/spell_checking_utils_test.dart b/pkg/front_end/test/spell_checking_utils_test.dart
index 658c88e..07c8904 100644
--- a/pkg/front_end/test/spell_checking_utils_test.dart
+++ b/pkg/front_end/test/spell_checking_utils_test.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 'spell_checking_utils.dart';
void main() {
diff --git a/pkg/front_end/test/spelling_test_base.dart b/pkg/front_end/test/spelling_test_base.dart
index bd0ea9f..f63a61c 100644
--- a/pkg/front_end/test/spelling_test_base.dart
+++ b/pkg/front_end/test/spelling_test_base.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:io' show File, Platform;
import 'dart:typed_data' show Uint8List;
diff --git a/pkg/front_end/test/spelling_test_external_targets.dart b/pkg/front_end/test/spelling_test_external_targets.dart
index 79ff96c..9bae907 100644
--- a/pkg/front_end/test/spelling_test_external_targets.dart
+++ b/pkg/front_end/test/spelling_test_external_targets.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:io' show Directory, File, FileSystemEntity;
import 'package:testing/testing.dart'
diff --git a/pkg/front_end/test/spelling_test_not_src_suite.dart b/pkg/front_end/test/spelling_test_not_src_suite.dart
index a6205de..6504052 100644
--- a/pkg/front_end/test/spelling_test_not_src_suite.dart
+++ b/pkg/front_end/test/spelling_test_not_src_suite.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:testing/testing.dart' show Chain, runMe;
import 'spelling_test_base.dart';
diff --git a/pkg/front_end/test/spelling_test_src_suite.dart b/pkg/front_end/test/spelling_test_src_suite.dart
index dfd1117..4ea5bb0 100644
--- a/pkg/front_end/test/spelling_test_src_suite.dart
+++ b/pkg/front_end/test/spelling_test_src_suite.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:testing/testing.dart' show Chain, runMe;
import 'spelling_test_base.dart';
diff --git a/pkg/front_end/test/split_dill_test.dart b/pkg/front_end/test/split_dill_test.dart
index 0ed6a0f..24e4782 100644
--- a/pkg/front_end/test/split_dill_test.dart
+++ b/pkg/front_end/test/split_dill_test.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:io' show Directory, File, Platform, Process, ProcessResult;
import 'dart:typed_data' show Uint8List;
diff --git a/pkg/front_end/test/src/base/libraries_specification_test.dart b/pkg/front_end/test/src/base/libraries_specification_test.dart
index 9d488aa..14cbae1 100644
--- a/pkg/front_end/test/src/base/libraries_specification_test.dart
+++ b/pkg/front_end/test/src/base/libraries_specification_test.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:front_end/src/base/libraries_specification.dart';
import 'package:test/test.dart';
diff --git a/pkg/front_end/test/src/base/processed_options_test.dart b/pkg/front_end/test/src/base/processed_options_test.dart
index b004fb1..f8a87cb 100644
--- a/pkg/front_end/test/src/base/processed_options_test.dart
+++ b/pkg/front_end/test/src/base/processed_options_test.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:front_end/src/api_prototype/compiler_options.dart';
import 'package:front_end/src/api_prototype/memory_file_system.dart';
import 'package:front_end/src/base/processed_options.dart';
diff --git a/pkg/front_end/test/standard_file_system_test.dart b/pkg/front_end/test/standard_file_system_test.dart
index 5f5fd02..a7becd7 100644
--- a/pkg/front_end/test/standard_file_system_test.dart
+++ b/pkg/front_end/test/standard_file_system_test.dart
@@ -3,6 +3,8 @@
// BSD-style license that can be found in the LICENSE file.
// SharedOptions=--supermixin
+// @dart = 2.9
+
library front_end.test.standard_file_system_test;
import 'dart:convert';
diff --git a/pkg/front_end/test/static_types/analysis_helper.dart b/pkg/front_end/test/static_types/analysis_helper.dart
index 805194f..539d58e 100644
--- a/pkg/front_end/test/static_types/analysis_helper.dart
+++ b/pkg/front_end/test/static_types/analysis_helper.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:convert' as json;
import 'dart:io';
diff --git a/pkg/front_end/test/static_types/cfe_allowed.json b/pkg/front_end/test/static_types/cfe_allowed.json
index 20c1a54..63088f0 100644
--- a/pkg/front_end/test/static_types/cfe_allowed.json
+++ b/pkg/front_end/test/static_types/cfe_allowed.json
@@ -3,9 +3,6 @@
"Dynamic invocation of 'split'.": 1
},
"pkg/front_end/lib/src/base/libraries_specification.dart": {
- "Dynamic invocation of 'containsKey'.": 1,
- "Dynamic invocation of '[]'.": 8,
- "Dynamic invocation of 'forEach'.": 1,
"Dynamic invocation of 'toList'.": 1,
"Dynamic invocation of 'map'.": 1,
"Dynamic invocation of '[]='.": 1
diff --git a/pkg/front_end/test/static_types/cfe_dynamic_test.dart b/pkg/front_end/test/static_types/cfe_dynamic_test.dart
index 306dc85..672ff9d 100644
--- a/pkg/front_end/test/static_types/cfe_dynamic_test.dart
+++ b/pkg/front_end/test/static_types/cfe_dynamic_test.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 'analysis_helper.dart';
/// Filter function used to only analysis cfe source code.
diff --git a/pkg/front_end/test/static_types/static_type_test.dart b/pkg/front_end/test/static_types/static_type_test.dart
index cad8d52..c90118c 100644
--- a/pkg/front_end/test/static_types/static_type_test.dart
+++ b/pkg/front_end/test/static_types/static_type_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart';
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/summary_generator_test.dart b/pkg/front_end/test/summary_generator_test.dart
index d641234..04deb3b 100644
--- a/pkg/front_end/test/summary_generator_test.dart
+++ b/pkg/front_end/test/summary_generator_test.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:front_end/src/api_prototype/front_end.dart';
import 'package:front_end/src/testing/compiler_common.dart';
import 'package:kernel/ast.dart';
diff --git a/pkg/front_end/test/test_generator_test.dart b/pkg/front_end/test/test_generator_test.dart
index 2ad6f36..8e35ddc 100644
--- a/pkg/front_end/test/test_generator_test.dart
+++ b/pkg/front_end/test/test_generator_test.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:io' show exitCode, File, stdout;
import 'package:front_end/src/api_prototype/compiler_options.dart';
diff --git a/pkg/front_end/test/testing_utils.dart b/pkg/front_end/test/testing_utils.dart
index b966e74..ba228a0 100644
--- a/pkg/front_end/test/testing_utils.dart
+++ b/pkg/front_end/test/testing_utils.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:io' show Directory, Process, ProcessResult;
import 'package:testing/testing.dart' show Chain, TestDescription;
diff --git a/pkg/front_end/test/text_representation/empty_reference_test.dart b/pkg/front_end/test/text_representation/empty_reference_test.dart
index 362672b..22643b3 100644
--- a/pkg/front_end/test/text_representation/empty_reference_test.dart
+++ b/pkg/front_end/test/text_representation/empty_reference_test.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:expect/expect.dart';
import 'package:kernel/ast.dart';
import 'text_representation_test.dart';
diff --git a/pkg/front_end/test/text_representation/internal_ast_text_representation_test.dart b/pkg/front_end/test/text_representation/internal_ast_text_representation_test.dart
index c0fd0e7a..a71ada8 100644
--- a/pkg/front_end/test/text_representation/internal_ast_text_representation_test.dart
+++ b/pkg/front_end/test/text_representation/internal_ast_text_representation_test.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:expect/expect.dart';
import 'package:front_end/src/fasta/kernel/collections.dart';
import 'package:front_end/src/fasta/kernel/forest.dart';
diff --git a/pkg/front_end/test/text_representation/text_representation_test.dart b/pkg/front_end/test/text_representation/text_representation_test.dart
index 8d57260..f804385 100644
--- a/pkg/front_end/test/text_representation/text_representation_test.dart
+++ b/pkg/front_end/test/text_representation/text_representation_test.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:io' show Directory, Platform;
import 'package:_fe_analyzer_shared/src/testing/id.dart';
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
diff --git a/pkg/front_end/test/textual_outline_test.dart b/pkg/front_end/test/textual_outline_test.dart
index 4a059e8..b6ea904 100644
--- a/pkg/front_end/test/textual_outline_test.dart
+++ b/pkg/front_end/test/textual_outline_test.dart
@@ -1,3 +1,9 @@
+// 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.md file.
+
+// @dart = 2.9
+
import "dart:convert";
import "package:front_end/src/fasta/util/textual_outline.dart";
diff --git a/pkg/front_end/test/token_test.dart b/pkg/front_end/test/token_test.dart
index d1d2a03..4a1249c 100644
--- a/pkg/front_end/test/token_test.dart
+++ b/pkg/front_end/test/token_test.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:_fe_analyzer_shared/src/scanner/scanner.dart'
show ScannerConfiguration, scanString;
import 'package:_fe_analyzer_shared/src/scanner/token.dart';
diff --git a/pkg/front_end/test/tool/reload.dart b/pkg/front_end/test/tool/reload.dart
index 78d669e..6d86a82 100644
--- a/pkg/front_end/test/tool/reload.dart
+++ b/pkg/front_end/test/tool/reload.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 helper library to connect to an existing VM and trigger a hot-reload via
/// its service protocol.
///
diff --git a/pkg/front_end/test/type_labeler_test.dart b/pkg/front_end/test/type_labeler_test.dart
index aea5433..8814e5e 100644
--- a/pkg/front_end/test/type_labeler_test.dart
+++ b/pkg/front_end/test/type_labeler_test.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 'package:front_end/src/fasta/kernel/type_labeler.dart';
diff --git a/pkg/front_end/test/unit_test_suites.dart b/pkg/front_end/test/unit_test_suites.dart
index 8e256f6..fde99ac 100644
--- a/pkg/front_end/test/unit_test_suites.dart
+++ b/pkg/front_end/test/unit_test_suites.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.md file.
+// @dart = 2.9
+
import 'dart:async' show Timer;
import 'dart:convert' show jsonEncode;
import 'dart:io' show File, Platform, exitCode;
diff --git a/pkg/front_end/test/utils/io_utils.dart b/pkg/front_end/test/utils/io_utils.dart
index 7fdd197..6cd9daa 100644
--- a/pkg/front_end/test/utils/io_utils.dart
+++ b/pkg/front_end/test/utils/io_utils.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.md file.
+// @dart = 2.9
+
import 'dart:io' show Directory, File, Platform, Process, ProcessResult;
String computeRepoDir() {
diff --git a/pkg/front_end/test/utils/kernel_chain.dart b/pkg/front_end/test/utils/kernel_chain.dart
index b76a823..5afe941 100644
--- a/pkg/front_end/test/utils/kernel_chain.dart
+++ b/pkg/front_end/test/utils/kernel_chain.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.md file.
+// @dart = 2.9
+
library fasta.testing.kernel_chain;
import 'dart:io' show Directory, File, IOSink, Platform;
diff --git a/pkg/front_end/test/utils/scanner_chain.dart b/pkg/front_end/test/utils/scanner_chain.dart
index 1bf5b45..635ef6d 100644
--- a/pkg/front_end/test/utils/scanner_chain.dart
+++ b/pkg/front_end/test/utils/scanner_chain.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.md file.
+// @dart = 2.9
+
library fasta.testing.scanner_chain;
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart'
diff --git a/pkg/front_end/test/utils/validating_instrumentation.dart b/pkg/front_end/test/utils/validating_instrumentation.dart
index 9680b32..184e7cb 100644
--- a/pkg/front_end/test/utils/validating_instrumentation.dart
+++ b/pkg/front_end/test/utils/validating_instrumentation.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.md file.
+// @dart = 2.9
+
import 'dart:convert' show utf8;
import 'dart:io' show File;
diff --git a/pkg/front_end/test/vm_service_coverage.dart b/pkg/front_end/test/vm_service_coverage.dart
index 7c69754..f5fd805 100644
--- a/pkg/front_end/test/vm_service_coverage.dart
+++ b/pkg/front_end/test/vm_service_coverage.dart
@@ -1,3 +1,9 @@
+// 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.md file.
+
+// @dart = 2.9
+
import 'dart:async';
import 'vm_service_helper.dart' as vmService;
diff --git a/pkg/front_end/test/vm_service_coverage_constant_evaluator.dart b/pkg/front_end/test/vm_service_coverage_constant_evaluator.dart
index d042077..5ea2bd0 100644
--- a/pkg/front_end/test/vm_service_coverage_constant_evaluator.dart
+++ b/pkg/front_end/test/vm_service_coverage_constant_evaluator.dart
@@ -1,3 +1,9 @@
+// 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.md file.
+
+// @dart = 2.9
+
import 'vm_service_coverage.dart' as helper;
main(List<String> args) async {
diff --git a/pkg/front_end/test/vm_service_for_leak_detection.dart b/pkg/front_end/test/vm_service_for_leak_detection.dart
index 748756e..6df63cc 100644
--- a/pkg/front_end/test/vm_service_for_leak_detection.dart
+++ b/pkg/front_end/test/vm_service_for_leak_detection.dart
@@ -1,3 +1,9 @@
+// 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
+
import 'dart:io';
import "vm_service_heap_helper.dart" as helper;
diff --git a/pkg/front_end/test/vm_service_heap_finder.dart b/pkg/front_end/test/vm_service_heap_finder.dart
index 2e85184..6fb49d91 100644
--- a/pkg/front_end/test/vm_service_heap_finder.dart
+++ b/pkg/front_end/test/vm_service_heap_finder.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:io";
import "vm_service_helper.dart" as vmService;
diff --git a/pkg/front_end/test/vm_service_heap_helper.dart b/pkg/front_end/test/vm_service_heap_helper.dart
index f4841d0..c011aea 100644
--- a/pkg/front_end/test/vm_service_heap_helper.dart
+++ b/pkg/front_end/test/vm_service_heap_helper.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 "dijkstras_sssp_algorithm.dart";
import "vm_service_helper.dart" as vmService;
diff --git a/pkg/front_end/test/vm_service_helper.dart b/pkg/front_end/test/vm_service_helper.dart
index a80eb5a..8906a43 100644
--- a/pkg/front_end/test/vm_service_helper.dart
+++ b/pkg/front_end/test/vm_service_helper.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:convert";
import "dart:io";
diff --git a/pkg/front_end/tool/_fasta/abcompile.dart b/pkg/front_end/tool/_fasta/abcompile.dart
index 63ea80b..26f815a 100644
--- a/pkg/front_end/tool/_fasta/abcompile.dart
+++ b/pkg/front_end/tool/_fasta/abcompile.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:async';
import 'dart:convert';
import 'dart:math';
diff --git a/pkg/front_end/tool/_fasta/additional_targets.dart b/pkg/front_end/tool/_fasta/additional_targets.dart
index 6e9399a..098cd0d 100644
--- a/pkg/front_end/tool/_fasta/additional_targets.dart
+++ b/pkg/front_end/tool/_fasta/additional_targets.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.tool.additional_targets;
import 'package:kernel/target/targets.dart' show TargetFlags, targets;
diff --git a/pkg/front_end/tool/_fasta/additional_targets_test.dart b/pkg/front_end/tool/_fasta/additional_targets_test.dart
index daffd49..d9fea70 100644
--- a/pkg/front_end/tool/_fasta/additional_targets_test.dart
+++ b/pkg/front_end/tool/_fasta/additional_targets_test.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.tool.additional_targets_test;
import 'package:kernel/target/targets.dart' show targets;
diff --git a/pkg/front_end/tool/_fasta/batch.dart b/pkg/front_end/tool/_fasta/batch.dart
index 968014e..ac34ce6 100644
--- a/pkg/front_end/tool/_fasta/batch.dart
+++ b/pkg/front_end/tool/_fasta/batch.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 'entry_points.dart' show batchEntryPoint;
main(List<String> arguments) => batchEntryPoint(arguments);
diff --git a/pkg/front_end/tool/_fasta/bench_maker.dart b/pkg/front_end/tool/_fasta/bench_maker.dart
index 6623d7a..dbfbb79 100644
--- a/pkg/front_end/tool/_fasta/bench_maker.dart
+++ b/pkg/front_end/tool/_fasta/bench_maker.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.tool.entry_points;
import "dart:convert" show JsonEncoder;
diff --git a/pkg/front_end/tool/_fasta/command_line.dart b/pkg/front_end/tool/_fasta/command_line.dart
index 9c275d4..4eb7083 100644
--- a/pkg/front_end/tool/_fasta/command_line.dart
+++ b/pkg/front_end/tool/_fasta/command_line.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.tool.command_line;
import 'dart:io' show exit;
diff --git a/pkg/front_end/tool/_fasta/compile.dart b/pkg/front_end/tool/_fasta/compile.dart
index 2165cf1..0fa58c9 100644
--- a/pkg/front_end/tool/_fasta/compile.dart
+++ b/pkg/front_end/tool/_fasta/compile.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 'entry_points.dart' show compileEntryPoint;
main(List<String> arguments) => compileEntryPoint(arguments);
diff --git a/pkg/front_end/tool/_fasta/compile_platform.dart b/pkg/front_end/tool/_fasta/compile_platform.dart
index c9791fb..352e1f0 100644
--- a/pkg/front_end/tool/_fasta/compile_platform.dart
+++ b/pkg/front_end/tool/_fasta/compile_platform.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 'entry_points.dart' show compilePlatformEntryPoint;
main(List<String> arguments) => compilePlatformEntryPoint(arguments);
diff --git a/pkg/front_end/tool/_fasta/compile_platform_legacy_test.dart b/pkg/front_end/tool/_fasta/compile_platform_legacy_test.dart
index 985026c..1f624d3 100644
--- a/pkg/front_end/tool/_fasta/compile_platform_legacy_test.dart
+++ b/pkg/front_end/tool/_fasta/compile_platform_legacy_test.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.md file.
+// @dart=2.9
+
library fasta.test.compile_platform_test;
import 'dart:io';
diff --git a/pkg/front_end/tool/_fasta/compile_platform_test.dart b/pkg/front_end/tool/_fasta/compile_platform_test.dart
index 985026c..1f624d3 100644
--- a/pkg/front_end/tool/_fasta/compile_platform_test.dart
+++ b/pkg/front_end/tool/_fasta/compile_platform_test.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.md file.
+// @dart=2.9
+
library fasta.test.compile_platform_test;
import 'dart:io';
diff --git a/pkg/front_end/tool/_fasta/deps.dart b/pkg/front_end/tool/_fasta/deps.dart
index 3b83d0f..3e8c7be 100644
--- a/pkg/front_end/tool/_fasta/deps.dart
+++ b/pkg/front_end/tool/_fasta/deps.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 'entry_points.dart' show depsEntryPoint;
main(List<String> arguments) => depsEntryPoint(arguments);
diff --git a/pkg/front_end/tool/_fasta/direct_parser_ast_helper_creator.dart b/pkg/front_end/tool/_fasta/direct_parser_ast_helper_creator.dart
index 8b7cf18..3fde7d0 100644
--- a/pkg/front_end/tool/_fasta/direct_parser_ast_helper_creator.dart
+++ b/pkg/front_end/tool/_fasta/direct_parser_ast_helper_creator.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:io';
import 'dart:typed_data';
diff --git a/pkg/front_end/tool/_fasta/entry_points.dart b/pkg/front_end/tool/_fasta/entry_points.dart
index b05374d..9733184 100644
--- a/pkg/front_end/tool/_fasta/entry_points.dart
+++ b/pkg/front_end/tool/_fasta/entry_points.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.tool.entry_points;
import 'dart:convert' show LineSplitter, jsonDecode, jsonEncode, utf8;
diff --git a/pkg/front_end/tool/_fasta/generate_experimental_flags.dart b/pkg/front_end/tool/_fasta/generate_experimental_flags.dart
index 8f16842..5911b3a 100644
--- a/pkg/front_end/tool/_fasta/generate_experimental_flags.dart
+++ b/pkg/front_end/tool/_fasta/generate_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
+
import 'dart:io' show File, Platform;
import 'package:_fe_analyzer_shared/src/scanner/characters.dart'
@@ -57,10 +59,12 @@
StringBuffer sb = new StringBuffer();
sb.write('''
-// 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
@@ -91,10 +95,12 @@
StringBuffer sb = new StringBuffer();
sb.write('''
-// 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
diff --git a/pkg/front_end/tool/_fasta/generate_experimental_flags_test.dart b/pkg/front_end/tool/_fasta/generate_experimental_flags_test.dart
index d826ea5..8320f37 100644
--- a/pkg/front_end/tool/_fasta/generate_experimental_flags_test.dart
+++ b/pkg/front_end/tool/_fasta/generate_experimental_flags_test.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:io" show File, exitCode;
import "generate_experimental_flags.dart"
diff --git a/pkg/front_end/tool/_fasta/generate_messages.dart b/pkg/front_end/tool/_fasta/generate_messages.dart
index 4cde3ec..23a3487 100644
--- a/pkg/front_end/tool/_fasta/generate_messages.dart
+++ b/pkg/front_end/tool/_fasta/generate_messages.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:io';
import 'dart:isolate';
@@ -53,11 +55,15 @@
StringBuffer sharedMessages = new StringBuffer();
StringBuffer cfeMessages = new StringBuffer();
- const String preamble = """
-// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
+ const String preamble1 = """
+// 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.
+""";
+
+ const String preamble2 = """
+
// NOTE: THIS FILE IS GENERATED. DO NOT EDIT.
//
// Instead modify 'pkg/front_end/messages.yaml' and run
@@ -66,12 +72,19 @@
// ignore_for_file: lines_longer_than_80_chars
""";
- sharedMessages.writeln(preamble);
+ sharedMessages.writeln(preamble1);
+ sharedMessages.writeln(preamble2);
sharedMessages.writeln("""
part of _fe_analyzer_shared.messages.codes;
""");
- cfeMessages.writeln(preamble);
+ cfeMessages.writeln(preamble1);
+ cfeMessages.writeln("""
+
+// @dart = 2.9
+
+""");
+ cfeMessages.writeln(preamble2);
cfeMessages.writeln("""
part of fasta.codes;
""");
diff --git a/pkg/front_end/tool/_fasta/generate_messages_test.dart b/pkg/front_end/tool/_fasta/generate_messages_test.dart
index 303be61..ccbff6a 100644
--- a/pkg/front_end/tool/_fasta/generate_messages_test.dart
+++ b/pkg/front_end/tool/_fasta/generate_messages_test.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:io" show File;
import "package:async_helper/async_helper.dart" show asyncTest;
diff --git a/pkg/front_end/tool/_fasta/log_analyzer.dart b/pkg/front_end/tool/_fasta/log_analyzer.dart
index c93e916..1a794a0 100644
--- a/pkg/front_end/tool/_fasta/log_analyzer.dart
+++ b/pkg/front_end/tool/_fasta/log_analyzer.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:convert' show jsonDecode, jsonEncode;
import 'dart:io';
diff --git a/pkg/front_end/tool/_fasta/log_collector.dart b/pkg/front_end/tool/_fasta/log_collector.dart
index b35250d..95dc56f 100644
--- a/pkg/front_end/tool/_fasta/log_collector.dart
+++ b/pkg/front_end/tool/_fasta/log_collector.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:convert' show jsonDecode, utf8;
import 'dart:isolate' show RawReceivePort;
diff --git a/pkg/front_end/tool/_fasta/outline.dart b/pkg/front_end/tool/_fasta/outline.dart
index dfba5cb..2a4d7f9 100644
--- a/pkg/front_end/tool/_fasta/outline.dart
+++ b/pkg/front_end/tool/_fasta/outline.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 'entry_points.dart' show outlineEntryPoint;
main(List<String> arguments) => outlineEntryPoint(arguments);
diff --git a/pkg/front_end/tool/compare_dill.dart b/pkg/front_end/tool/compare_dill.dart
index f537a0f..f7e24b3 100644
--- a/pkg/front_end/tool/compare_dill.dart
+++ b/pkg/front_end/tool/compare_dill.dart
@@ -1,3 +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
+
import 'dart:io' show File;
import '../test/binary_md_dill_reader.dart' show DillComparer;
diff --git a/pkg/front_end/tool/fasta.dart b/pkg/front_end/tool/fasta.dart
index f2ecaaf..b2b8d26 100644
--- a/pkg/front_end/tool/fasta.dart
+++ b/pkg/front_end/tool/fasta.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:io';
import '../test/utils/io_utils.dart' show computeRepoDir;
diff --git a/pkg/front_end/tool/fasta_perf.dart b/pkg/front_end/tool/fasta_perf.dart
index 385ec39..cd92061 100644
--- a/pkg/front_end/tool/fasta_perf.dart
+++ b/pkg/front_end/tool/fasta_perf.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
+
/// An entrypoint used to run portions of fasta and measure its performance.
library front_end.tool.fasta_perf;
diff --git a/pkg/front_end/tool/fasta_perf_test.dart b/pkg/front_end/tool/fasta_perf_test.dart
index f366e73..fb850f0 100644
--- a/pkg/front_end/tool/fasta_perf_test.dart
+++ b/pkg/front_end/tool/fasta_perf_test.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
+
/// The only purpose of this file is to enable analyzer tests on `perf.dart`,
/// the code here just has a dummy import to the rest of the code.
library front_end.tool.perf_test;
diff --git a/pkg/front_end/tool/incremental_perf.dart b/pkg/front_end/tool/incremental_perf.dart
index 617e448..50c922c 100644
--- a/pkg/front_end/tool/incremental_perf.dart
+++ b/pkg/front_end/tool/incremental_perf.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
+
/// An entrypoint used to measure performance of the incremental compiler.
///
/// Given an input a program and a .json file describing edits, this script will
diff --git a/pkg/front_end/tool/incremental_perf_test.dart b/pkg/front_end/tool/incremental_perf_test.dart
index 73e0893..72deb00 100644
--- a/pkg/front_end/tool/incremental_perf_test.dart
+++ b/pkg/front_end/tool/incremental_perf_test.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
+
/// Test to ensure that incremental_perf.dart is running without errors.
import 'dart:io';
diff --git a/pkg/front_end/tool/kernel_ast_file_rewriter.dart b/pkg/front_end/tool/kernel_ast_file_rewriter.dart
index bdefeae..64bd396 100644
--- a/pkg/front_end/tool/kernel_ast_file_rewriter.dart
+++ b/pkg/front_end/tool/kernel_ast_file_rewriter.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:io" show File, Platform, stdout;
import "dart:typed_data" show Uint8List;
diff --git a/pkg/front_end/tool/parser_direct_ast/console_helper.dart b/pkg/front_end/tool/parser_direct_ast/console_helper.dart
index d6a1d34..d758c92 100644
--- a/pkg/front_end/tool/parser_direct_ast/console_helper.dart
+++ b/pkg/front_end/tool/parser_direct_ast/console_helper.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:async" show StreamSubscription, Timer;
import "dart:io" show Platform, ProcessSignal, exit, stdin, stdout;
import "dart:isolate" show RawReceivePort;
diff --git a/pkg/front_end/tool/parser_direct_ast/viewer.dart b/pkg/front_end/tool/parser_direct_ast/viewer.dart
index c516101..276ea23 100644
--- a/pkg/front_end/tool/parser_direct_ast/viewer.dart
+++ b/pkg/front_end/tool/parser_direct_ast/viewer.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:io" show File, Platform;
import "dart:typed_data" show Uint8List;
diff --git a/pkg/front_end/tool/perf.dart b/pkg/front_end/tool/perf.dart
index 95b3ba5..61ee9d3 100644
--- a/pkg/front_end/tool/perf.dart
+++ b/pkg/front_end/tool/perf.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
+
/// An entrypoint used to run portions of analyzer and measure its performance.
///
/// TODO(sigmund): rename to 'analyzer_perf.dart' in sync with changes to the
diff --git a/pkg/front_end/tool/perf_common.dart b/pkg/front_end/tool/perf_common.dart
index 7da7dcb..0ba1365 100644
--- a/pkg/front_end/tool/perf_common.dart
+++ b/pkg/front_end/tool/perf_common.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
+
/// Shared code used by fasta_perf and incremental_perf.
library front_end.tool.perf_common;
diff --git a/pkg/front_end/tool/perf_test.dart b/pkg/front_end/tool/perf_test.dart
index 7b54fb8..b246c05 100644
--- a/pkg/front_end/tool/perf_test.dart
+++ b/pkg/front_end/tool/perf_test.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.tool.perf_test;
import 'dart:io' show Platform;
diff --git a/pkg/front_end/tool/smoke_test_quick.dart b/pkg/front_end/tool/smoke_test_quick.dart
index 03d3840..7427ee3 100644
--- a/pkg/front_end/tool/smoke_test_quick.dart
+++ b/pkg/front_end/tool/smoke_test_quick.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:io' show Platform, Process, ProcessResult, exitCode;
import '../test/utils/io_utils.dart' show computeRepoDir;
diff --git a/pkg/front_end/tool/stat_on_dash_v.dart b/pkg/front_end/tool/stat_on_dash_v.dart
index ead3e7b..c0ac7b4 100644
--- a/pkg/front_end/tool/stat_on_dash_v.dart
+++ b/pkg/front_end/tool/stat_on_dash_v.dart
@@ -1,3 +1,9 @@
+// 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
+
import "dart:io";
import "../test/simple_stats.dart";
diff --git a/pkg/front_end/tool/update_all.dart b/pkg/front_end/tool/update_all.dart
index a4ff797..41ba6a1 100644
--- a/pkg/front_end/tool/update_all.dart
+++ b/pkg/front_end/tool/update_all.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:_fe_analyzer_shared/src/testing/id_testing.dart' as id;
import 'update_expectations.dart' as expectations;
diff --git a/pkg/front_end/tool/update_expectations.dart b/pkg/front_end/tool/update_expectations.dart
index 52bcd00..a1cc85c 100644
--- a/pkg/front_end/tool/update_expectations.dart
+++ b/pkg/front_end/tool/update_expectations.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 'fasta.dart' as fasta;
const List<String> standardSuites = <String>[
diff --git a/pkg/kernel/bin/count_breakdown.dart b/pkg/kernel/bin/count_breakdown.dart
index 43450ff..13dd0737 100755
--- a/pkg/kernel/bin/count_breakdown.dart
+++ b/pkg/kernel/bin/count_breakdown.dart
@@ -3,6 +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.
+// @dart = 2.9
+
import 'dart:io';
import 'package:kernel/kernel.dart';
import 'package:kernel/src/tool/command_line_util.dart';
diff --git a/pkg/kernel/bin/dump.dart b/pkg/kernel/bin/dump.dart
index 0c3ab47..c95a4e5 100755
--- a/pkg/kernel/bin/dump.dart
+++ b/pkg/kernel/bin/dump.dart
@@ -3,6 +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.
+// @dart = 2.9
+
import 'dart:io';
import 'package:kernel/kernel.dart';
diff --git a/pkg/kernel/bin/size_breakdown.dart b/pkg/kernel/bin/size_breakdown.dart
index 298e1ec..979b828 100755
--- a/pkg/kernel/bin/size_breakdown.dart
+++ b/pkg/kernel/bin/size_breakdown.dart
@@ -3,6 +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.
+// @dart = 2.9
+
import 'dart:io';
import 'package:kernel/kernel.dart';
diff --git a/pkg/kernel/bin/split.dart b/pkg/kernel/bin/split.dart
index e3c99e8..61d5f0c 100755
--- a/pkg/kernel/bin/split.dart
+++ b/pkg/kernel/bin/split.dart
@@ -3,6 +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.
+// @dart = 2.9
+
import 'dart:async';
import 'dart:io';
diff --git a/pkg/kernel/bin/type_check.dart b/pkg/kernel/bin/type_check.dart
index 5c3ef65..5c41244 100755
--- a/pkg/kernel/bin/type_check.dart
+++ b/pkg/kernel/bin/type_check.dart
@@ -3,6 +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.
+// @dart = 2.9
+
import 'dart:io';
import 'package:kernel/error_formatter.dart';
diff --git a/pkg/kernel/lib/ast.dart b/pkg/kernel/lib/ast.dart
index 81fcfb6..4f81bdd 100644
--- a/pkg/kernel/lib/ast.dart
+++ b/pkg/kernel/lib/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
+
/// -----------------------------------------------------------------------
/// WHEN CHANGING THIS FILE:
/// -----------------------------------------------------------------------
diff --git a/pkg/kernel/lib/binary/ast_from_binary.dart b/pkg/kernel/lib/binary/ast_from_binary.dart
index 0d81ce0..e6a4456 100644
--- a/pkg/kernel/lib/binary/ast_from_binary.dart
+++ b/pkg/kernel/lib/binary/ast_from_binary.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.ast_from_binary;
import 'dart:core' hide MapEntry;
diff --git a/pkg/kernel/lib/binary/ast_to_binary.dart b/pkg/kernel/lib/binary/ast_to_binary.dart
index 9a698fb..d706a36 100644
--- a/pkg/kernel/lib/binary/ast_to_binary.dart
+++ b/pkg/kernel/lib/binary/ast_to_binary.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.ast_to_binary;
import 'dart:core' hide MapEntry;
diff --git a/pkg/kernel/lib/binary/tag.dart b/pkg/kernel/lib/binary/tag.dart
index 8e32adb..410617c 100644
--- a/pkg/kernel/lib/binary/tag.dart
+++ b/pkg/kernel/lib/binary/tag.dart
@@ -1,6 +1,7 @@
// Copyright (c) 2016, 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.
+
library kernel.binary.tag;
class Tag {
diff --git a/pkg/kernel/lib/canonical_name.dart b/pkg/kernel/lib/canonical_name.dart
index a5d6446..70f3004 100644
--- a/pkg/kernel/lib/canonical_name.dart
+++ b/pkg/kernel/lib/canonical_name.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.canonical_name;
import 'ast.dart';
diff --git a/pkg/kernel/lib/class_hierarchy.dart b/pkg/kernel/lib/class_hierarchy.dart
index 1a75d7e..26ef345 100644
--- a/pkg/kernel/lib/class_hierarchy.dart
+++ b/pkg/kernel/lib/class_hierarchy.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.class_hierarchy;
import 'dart:collection';
diff --git a/pkg/kernel/lib/clone.dart b/pkg/kernel/lib/clone.dart
index 4158c39..83a94a1 100644
--- a/pkg/kernel/lib/clone.dart
+++ b/pkg/kernel/lib/clone.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.clone;
import 'dart:core' hide MapEntry;
diff --git a/pkg/kernel/lib/core_types.dart b/pkg/kernel/lib/core_types.dart
index e7c5646..7c9a566 100644
--- a/pkg/kernel/lib/core_types.dart
+++ b/pkg/kernel/lib/core_types.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.core_types;
import 'package:kernel/type_algebra.dart';
diff --git a/pkg/kernel/lib/default_language_version.dart b/pkg/kernel/lib/default_language_version.dart
index 465988e..8dbbe5b 100644
--- a/pkg/kernel/lib/default_language_version.dart
+++ b/pkg/kernel/lib/default_language_version.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
diff --git a/pkg/kernel/lib/error_formatter.dart b/pkg/kernel/lib/error_formatter.dart
index 42265e7..aab719e 100644
--- a/pkg/kernel/lib/error_formatter.dart
+++ b/pkg/kernel/lib/error_formatter.dart
@@ -3,6 +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.
+// @dart = 2.9
+
import 'package:kernel/kernel.dart';
import 'package:kernel/naive_type_checker.dart';
import 'package:kernel/text/ast_to_text.dart';
diff --git a/pkg/kernel/lib/external_name.dart b/pkg/kernel/lib/external_name.dart
index 157981d..2531780 100644
--- a/pkg/kernel/lib/external_name.dart
+++ b/pkg/kernel/lib/external_name.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 kernel.external_name;
import 'ast.dart';
diff --git a/pkg/kernel/lib/import_table.dart b/pkg/kernel/lib/import_table.dart
index c85e9f3..c7662b4 100644
--- a/pkg/kernel/lib/import_table.dart
+++ b/pkg/kernel/lib/import_table.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.import_table;
import 'ast.dart';
diff --git a/pkg/kernel/lib/kernel.dart b/pkg/kernel/lib/kernel.dart
index 45ccce9..cae6df9 100644
--- a/pkg/kernel/lib/kernel.dart
+++ b/pkg/kernel/lib/kernel.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
+
/// Conventions for paths:
///
/// - Use the [Uri] class for paths that may have the `file`, `dart` or
diff --git a/pkg/kernel/lib/library_index.dart b/pkg/kernel/lib/library_index.dart
index d8e36e7..f45aaa5 100644
--- a/pkg/kernel/lib/library_index.dart
+++ b/pkg/kernel/lib/library_index.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.library_index;
import 'ast.dart';
diff --git a/pkg/kernel/lib/naive_type_checker.dart b/pkg/kernel/lib/naive_type_checker.dart
index 76479c2..250dde9 100644
--- a/pkg/kernel/lib/naive_type_checker.dart
+++ b/pkg/kernel/lib/naive_type_checker.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 'class_hierarchy.dart';
import 'core_types.dart';
import 'kernel.dart';
diff --git a/pkg/kernel/lib/reference_from_index.dart b/pkg/kernel/lib/reference_from_index.dart
index fd99974..0a2ca57 100644
--- a/pkg/kernel/lib/reference_from_index.dart
+++ b/pkg/kernel/lib/reference_from_index.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 "ast.dart"
show
Class,
diff --git a/pkg/kernel/lib/src/assumptions.dart b/pkg/kernel/lib/src/assumptions.dart
index 2e131a7..e8c759b 100644
--- a/pkg/kernel/lib/src/assumptions.dart
+++ b/pkg/kernel/lib/src/assumptions.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 '../ast.dart';
/// Pairs of [TypeParameter]s that are currently assumed to be
diff --git a/pkg/kernel/lib/src/bounds_checks.dart b/pkg/kernel/lib/src/bounds_checks.dart
index a9c7859..d6e635b 100644
--- a/pkg/kernel/lib/src/bounds_checks.dart
+++ b/pkg/kernel/lib/src/bounds_checks.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 '../ast.dart'
show
BottomType,
diff --git a/pkg/kernel/lib/src/dart_type_equivalence.dart b/pkg/kernel/lib/src/dart_type_equivalence.dart
index 35eeff4..ee4f758 100644
--- a/pkg/kernel/lib/src/dart_type_equivalence.dart
+++ b/pkg/kernel/lib/src/dart_type_equivalence.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.md file.
+// @dart = 2.9
+
import '../ast.dart';
import '../core_types.dart';
import '../visitor.dart';
diff --git a/pkg/kernel/lib/src/future_value_type.dart b/pkg/kernel/lib/src/future_value_type.dart
index e3fd270..a77cef5 100644
--- a/pkg/kernel/lib/src/future_value_type.dart
+++ b/pkg/kernel/lib/src/future_value_type.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 '../ast.dart';
import '../core_types.dart';
diff --git a/pkg/kernel/lib/src/hierarchy_based_type_environment.dart b/pkg/kernel/lib/src/hierarchy_based_type_environment.dart
index 9474496..e259b73 100644
--- a/pkg/kernel/lib/src/hierarchy_based_type_environment.dart
+++ b/pkg/kernel/lib/src/hierarchy_based_type_environment.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 kernel.hierarchy_based_type_environment;
import '../ast.dart' show Class, DartType, InterfaceType, Library, Member, Name;
diff --git a/pkg/kernel/lib/src/legacy_erasure.dart b/pkg/kernel/lib/src/legacy_erasure.dart
index 3628368..c31e80b 100644
--- a/pkg/kernel/lib/src/legacy_erasure.dart
+++ b/pkg/kernel/lib/src/legacy_erasure.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.md file.
+// @dart = 2.9
+
import '../ast.dart' hide MapEntry;
import 'replacement_visitor.dart';
diff --git a/pkg/kernel/lib/src/merge_visitor.dart b/pkg/kernel/lib/src/merge_visitor.dart
index 62eb99a..dc1b77b 100644
--- a/pkg/kernel/lib/src/merge_visitor.dart
+++ b/pkg/kernel/lib/src/merge_visitor.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.md file.
+// @dart = 2.9
+
import '../ast.dart' hide MapEntry;
import '../type_algebra.dart';
diff --git a/pkg/kernel/lib/src/nnbd_top_merge.dart b/pkg/kernel/lib/src/nnbd_top_merge.dart
index 9a56df4..fd5f9eb 100644
--- a/pkg/kernel/lib/src/nnbd_top_merge.dart
+++ b/pkg/kernel/lib/src/nnbd_top_merge.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.md file.
+// @dart = 2.9
+
import '../ast.dart' hide MapEntry;
import '../core_types.dart';
diff --git a/pkg/kernel/lib/src/non_null.dart b/pkg/kernel/lib/src/non_null.dart
index 14e0c01..2a90dad 100644
--- a/pkg/kernel/lib/src/non_null.dart
+++ b/pkg/kernel/lib/src/non_null.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.md file.
+// @dart = 2.9
+
import '../ast.dart';
/// Returns the type defines as `NonNull(type)` in the nnbd specification.
diff --git a/pkg/kernel/lib/src/norm.dart b/pkg/kernel/lib/src/norm.dart
index c8d0f71..1b92f42 100644
--- a/pkg/kernel/lib/src/norm.dart
+++ b/pkg/kernel/lib/src/norm.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.md file.
+// @dart = 2.9
+
import '../ast.dart' hide MapEntry;
import '../core_types.dart';
import '../type_algebra.dart';
diff --git a/pkg/kernel/lib/src/printer.dart b/pkg/kernel/lib/src/printer.dart
index 0e9223d..c6a8f57 100644
--- a/pkg/kernel/lib/src/printer.dart
+++ b/pkg/kernel/lib/src/printer.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 '../ast.dart';
import 'text_util.dart';
diff --git a/pkg/kernel/lib/src/replacement_visitor.dart b/pkg/kernel/lib/src/replacement_visitor.dart
index ce7dbd1..e260919 100644
--- a/pkg/kernel/lib/src/replacement_visitor.dart
+++ b/pkg/kernel/lib/src/replacement_visitor.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.md file.
+// @dart = 2.9
+
import '../ast.dart' hide MapEntry;
import '../type_algebra.dart';
diff --git a/pkg/kernel/lib/src/standard_bounds.dart b/pkg/kernel/lib/src/standard_bounds.dart
index d622437..de99a5e 100644
--- a/pkg/kernel/lib/src/standard_bounds.dart
+++ b/pkg/kernel/lib/src/standard_bounds.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.md file.
+// @dart = 2.9
+
import 'dart:math' as math;
import '../ast.dart'
diff --git a/pkg/kernel/lib/src/text_util.dart b/pkg/kernel/lib/src/text_util.dart
index 9fe573f..c7634ad 100644
--- a/pkg/kernel/lib/src/text_util.dart
+++ b/pkg/kernel/lib/src/text_util.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 '../ast.dart';
String nullabilityToString(Nullability nullability) {
diff --git a/pkg/kernel/lib/src/tool/batch_util.dart b/pkg/kernel/lib/src/tool/batch_util.dart
index 9412c80..6909087 100644
--- a/pkg/kernel/lib/src/tool/batch_util.dart
+++ b/pkg/kernel/lib/src/tool/batch_util.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.batch_util;
import 'dart:convert';
diff --git a/pkg/kernel/lib/src/tool/command_line_util.dart b/pkg/kernel/lib/src/tool/command_line_util.dart
index 1abadb2..858e1b1 100644
--- a/pkg/kernel/lib/src/tool/command_line_util.dart
+++ b/pkg/kernel/lib/src/tool/command_line_util.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:io';
import 'package:kernel/kernel.dart';
diff --git a/pkg/kernel/lib/src/tool/find_referenced_libraries.dart b/pkg/kernel/lib/src/tool/find_referenced_libraries.dart
index e95c7df..73733ca 100644
--- a/pkg/kernel/lib/src/tool/find_referenced_libraries.dart
+++ b/pkg/kernel/lib/src/tool/find_referenced_libraries.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 'package:kernel/visitor.dart';
diff --git a/pkg/kernel/lib/src/types.dart b/pkg/kernel/lib/src/types.dart
index 02a4933..4dcec69 100644
--- a/pkg/kernel/lib/src/types.dart
+++ b/pkg/kernel/lib/src/types.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 '../ast.dart'
show
BottomType,
diff --git a/pkg/kernel/lib/target/changed_structure_notifier.dart b/pkg/kernel/lib/target/changed_structure_notifier.dart
index e1b2c7f..228a5d2 100644
--- a/pkg/kernel/lib/target/changed_structure_notifier.dart
+++ b/pkg/kernel/lib/target/changed_structure_notifier.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' show Class;
/// Meant for notifying the backend (the compiler) that the structure has
diff --git a/pkg/kernel/lib/target/targets.dart b/pkg/kernel/lib/target/targets.dart
index 8018658..27f5eba 100644
--- a/pkg/kernel/lib/target/targets.dart
+++ b/pkg/kernel/lib/target/targets.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.target.targets;
import '../ast.dart';
diff --git a/pkg/kernel/lib/testing/mock_sdk.dart b/pkg/kernel/lib/testing/mock_sdk.dart
index d4a937b..45a7d0c 100644
--- a/pkg/kernel/lib/testing/mock_sdk.dart
+++ b/pkg/kernel/lib/testing/mock_sdk.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
+
const String mockSdk = """
class Object;
class Comparable<T>;
diff --git a/pkg/kernel/lib/testing/mock_sdk_component.dart b/pkg/kernel/lib/testing/mock_sdk_component.dart
index 180ad92..b317b60 100644
--- a/pkg/kernel/lib/testing/mock_sdk_component.dart
+++ b/pkg/kernel/lib/testing/mock_sdk_component.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';
/// Returns a [Component] object containing empty definitions of core SDK
diff --git a/pkg/kernel/lib/testing/type_parser.dart b/pkg/kernel/lib/testing/type_parser.dart
index ef288ed..5842eee 100644
--- a/pkg/kernel/lib/testing/type_parser.dart
+++ b/pkg/kernel/lib/testing/type_parser.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' show Nullability;
abstract class ParsedType {
diff --git a/pkg/kernel/lib/testing/type_parser_environment.dart b/pkg/kernel/lib/testing/type_parser_environment.dart
index 40484e6..48a843a 100644
--- a/pkg/kernel/lib/testing/type_parser_environment.dart
+++ b/pkg/kernel/lib/testing/type_parser_environment.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"
show
BottomType,
diff --git a/pkg/kernel/lib/text/ast_to_text.dart b/pkg/kernel/lib/text/ast_to_text.dart
index 2250af1..0ca1b4a 100644
--- a/pkg/kernel/lib/text/ast_to_text.dart
+++ b/pkg/kernel/lib/text/ast_to_text.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.ast_to_text;
import 'dart:core' hide MapEntry;
diff --git a/pkg/kernel/lib/text/serializer_combinators.dart b/pkg/kernel/lib/text/serializer_combinators.dart
index dc8fe50..3bd9e1d 100644
--- a/pkg/kernel/lib/text/serializer_combinators.dart
+++ b/pkg/kernel/lib/text/serializer_combinators.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 kernel.serializer_combinators;
import 'dart:convert' show json;
diff --git a/pkg/kernel/lib/text/text_reader.dart b/pkg/kernel/lib/text/text_reader.dart
index a6867e7..21fd497 100644
--- a/pkg/kernel/lib/text/text_reader.dart
+++ b/pkg/kernel/lib/text/text_reader.dart
@@ -17,7 +17,7 @@
//
// We use an iterator to read S-expressions. The iterator produces a stream
// of atoms (strings) and nested iterators (S-lists).
-class TextIterator implements Iterator<Object /* String | TextIterator */ > {
+class TextIterator implements Iterator<Object? /* String? | TextIterator? */ > {
static int space = ' '.codeUnitAt(0);
static int lparen = '('.codeUnitAt(0);
static int rparen = ')'.codeUnitAt(0);
@@ -39,7 +39,7 @@
// Consume the rest of a nested S-expression and the closing delimiter.
void skipToEndOfNested() {
if (current is TextIterator) {
- TextIterator it = current;
+ TextIterator it = current as TextIterator;
while (it.moveNext()) {}
index = it.index + 1;
}
@@ -77,7 +77,7 @@
}
@override
- Object current = null;
+ Object? current = null;
@override
bool moveNext() {
diff --git a/pkg/kernel/lib/text/text_serialization_verifier.dart b/pkg/kernel/lib/text/text_serialization_verifier.dart
index 0b983c2..0298ad7 100644
--- a/pkg/kernel/lib/text/text_serialization_verifier.dart
+++ b/pkg/kernel/lib/text/text_serialization_verifier.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:convert' show json;
import '../ast.dart';
diff --git a/pkg/kernel/lib/text/text_serializer.dart b/pkg/kernel/lib/text/text_serializer.dart
index be1e4cf..f81886b 100644
--- a/pkg/kernel/lib/text/text_serializer.dart
+++ b/pkg/kernel/lib/text/text_serializer.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 kernel.text_serializer;
import '../ast.dart';
diff --git a/pkg/kernel/lib/transformations/async.dart b/pkg/kernel/lib/transformations/async.dart
index 37c9ea9..e8ac7ba 100644
--- a/pkg/kernel/lib/transformations/async.dart
+++ b/pkg/kernel/lib/transformations/async.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 kernel.transformations.async;
import '../kernel.dart';
diff --git a/pkg/kernel/lib/transformations/continuation.dart b/pkg/kernel/lib/transformations/continuation.dart
index cf5e16f..0df3e84 100644
--- a/pkg/kernel/lib/transformations/continuation.dart
+++ b/pkg/kernel/lib/transformations/continuation.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 kernel.transformations.continuation;
import 'dart:math' as math;
diff --git a/pkg/kernel/lib/transformations/empty.dart b/pkg/kernel/lib/transformations/empty.dart
index 5a264dd7..c07883b 100644
--- a/pkg/kernel/lib/transformations/empty.dart
+++ b/pkg/kernel/lib/transformations/empty.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 kernel.transformations.empty;
import '../ast.dart';
diff --git a/pkg/kernel/lib/transformations/flags.dart b/pkg/kernel/lib/transformations/flags.dart
index 32cd627..cb6bafd 100644
--- a/pkg/kernel/lib/transformations/flags.dart
+++ b/pkg/kernel/lib/transformations/flags.dart
@@ -1,3 +1,9 @@
+// Copyright (c) 2016, 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 kernel.transformations.flags;
import '../ast.dart';
diff --git a/pkg/kernel/lib/transformations/mixin_full_resolution.dart b/pkg/kernel/lib/transformations/mixin_full_resolution.dart
index 6a9a8b8..8e17efa 100644
--- a/pkg/kernel/lib/transformations/mixin_full_resolution.dart
+++ b/pkg/kernel/lib/transformations/mixin_full_resolution.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.transformations.mixin_full_resolution;
import '../ast.dart';
diff --git a/pkg/kernel/lib/transformations/scanner.dart b/pkg/kernel/lib/transformations/scanner.dart
index ce4b9fc..5aac0a8 100644
--- a/pkg/kernel/lib/transformations/scanner.dart
+++ b/pkg/kernel/lib/transformations/scanner.dart
@@ -1,3 +1,9 @@
+// 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
+
library kernel.transformations.scanner;
import '../ast.dart';
diff --git a/pkg/kernel/lib/transformations/track_widget_constructor_locations.dart b/pkg/kernel/lib/transformations/track_widget_constructor_locations.dart
index 0cdafba..2eeb952 100644
--- a/pkg/kernel/lib/transformations/track_widget_constructor_locations.dart
+++ b/pkg/kernel/lib/transformations/track_widget_constructor_locations.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 kernel.transformations.track_widget_constructor_locations;
import 'package:meta/meta.dart';
diff --git a/pkg/kernel/lib/transformations/type_casts_optimizer.dart b/pkg/kernel/lib/transformations/type_casts_optimizer.dart
index 4df790f..5f901e6 100644
--- a/pkg/kernel/lib/transformations/type_casts_optimizer.dart
+++ b/pkg/kernel/lib/transformations/type_casts_optimizer.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 'package:kernel/type_environment.dart'
show StaticTypeContext, SubtypeCheckMode, TypeEnvironment;
diff --git a/pkg/kernel/lib/transformations/value_class.dart b/pkg/kernel/lib/transformations/value_class.dart
index 5e21e5c..0264e0a 100644
--- a/pkg/kernel/lib/transformations/value_class.dart
+++ b/pkg/kernel/lib/transformations/value_class.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 kernel.transformations.value_class;
import 'package:kernel/type_environment.dart';
diff --git a/pkg/kernel/lib/type_algebra.dart b/pkg/kernel/lib/type_algebra.dart
index e40c0fc..b8c60a0 100644
--- a/pkg/kernel/lib/type_algebra.dart
+++ b/pkg/kernel/lib/type_algebra.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.type_algebra;
import 'ast.dart';
diff --git a/pkg/kernel/lib/type_checker.dart b/pkg/kernel/lib/type_checker.dart
index e68e340..4748f26 100644
--- a/pkg/kernel/lib/type_checker.dart
+++ b/pkg/kernel/lib/type_checker.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.type_checker;
import 'ast.dart';
diff --git a/pkg/kernel/lib/type_environment.dart b/pkg/kernel/lib/type_environment.dart
index 7e0dedc..4b993f5 100644
--- a/pkg/kernel/lib/type_environment.dart
+++ b/pkg/kernel/lib/type_environment.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.type_environment;
import 'package:kernel/type_algebra.dart';
diff --git a/pkg/kernel/lib/util/graph.dart b/pkg/kernel/lib/util/graph.dart
index f54f8a4..4119f1b 100644
--- a/pkg/kernel/lib/util/graph.dart
+++ b/pkg/kernel/lib/util/graph.dart
@@ -34,7 +34,7 @@
// Step 3: For each edge from [vertex] to a neighboring vertex [neighbor]:
for (T neighbor in graph.neighborsOf(vertex)) {
- int neighborPreorderNumber = preorderNumbers[neighbor];
+ int? neighborPreorderNumber = preorderNumbers[neighbor];
if (neighborPreorderNumber == null) {
// If the preorder number of [neighbor] has not yet been assigned,
// recursively search [neighbor];
@@ -46,7 +46,7 @@
// * Repeatedly pop vertices from [candidates] until the top element of
// [candidates] has a preorder number less than or equal to the
// preorder number of [neighbor].
- while (preorderNumbers[candidates.last] > neighborPreorderNumber) {
+ while (preorderNumbers[candidates.last]! > neighborPreorderNumber) {
candidates.removeLast();
}
}
diff --git a/pkg/kernel/lib/verifier.dart b/pkg/kernel/lib/verifier.dart
index ee38bc3..6bfbf06 100644
--- a/pkg/kernel/lib/verifier.dart
+++ b/pkg/kernel/lib/verifier.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.checks;
import 'ast.dart';
diff --git a/pkg/kernel/lib/visitor.dart b/pkg/kernel/lib/visitor.dart
index a8e984a..fefa970 100644
--- a/pkg/kernel/lib/visitor.dart
+++ b/pkg/kernel/lib/visitor.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.ast.visitor;
import 'dart:core' hide MapEntry;
diff --git a/pkg/kernel/lib/vm/constants_native_effects.dart b/pkg/kernel/lib/vm/constants_native_effects.dart
index 8bb1bac..401504a 100644
--- a/pkg/kernel/lib/vm/constants_native_effects.dart
+++ b/pkg/kernel/lib/vm/constants_native_effects.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 vm.constants_native_effects;
import '../ast.dart';
diff --git a/pkg/kernel/pubspec.yaml b/pkg/kernel/pubspec.yaml
index 3609233..09b5348 100644
--- a/pkg/kernel/pubspec.yaml
+++ b/pkg/kernel/pubspec.yaml
@@ -6,7 +6,7 @@
publish_to: none
environment:
- sdk: '>=2.6.0 <3.0.0'
+ sdk: '>=2.12.0 <3.0.0'
dependencies:
meta:
path: ../meta
diff --git a/pkg/kernel/test/ast_membench.dart b/pkg/kernel/test/ast_membench.dart
index dc50ccc..baf8245 100644
--- a/pkg/kernel/test/ast_membench.dart
+++ b/pkg/kernel/test/ast_membench.dart
@@ -2,6 +2,9 @@
// Copyright (c) 2016, 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
+
import 'package:kernel/kernel.dart';
import 'dart:io';
diff --git a/pkg/kernel/test/binary/can_read_platform_test.dart b/pkg/kernel/test/binary/can_read_platform_test.dart
index 2b447bc..2c8d827 100644
--- a/pkg/kernel/test/binary/can_read_platform_test.dart
+++ b/pkg/kernel/test/binary/can_read_platform_test.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:io';
import 'package:kernel/binary/ast_from_binary.dart';
diff --git a/pkg/kernel/test/binary/component_mode_test.dart b/pkg/kernel/test/binary/component_mode_test.dart
index 982270d..b03ea0a 100644
--- a/pkg/kernel/test/binary/component_mode_test.dart
+++ b/pkg/kernel/test/binary/component_mode_test.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/binary/ast_from_binary.dart';
import 'utils.dart';
diff --git a/pkg/kernel/test/binary/invalid_index_size.dart b/pkg/kernel/test/binary/invalid_index_size.dart
index 46f9bc4..454ede6 100644
--- a/pkg/kernel/test/binary/invalid_index_size.dart
+++ b/pkg/kernel/test/binary/invalid_index_size.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/binary/ast_from_binary.dart' show ParseError;
import 'utils.dart';
diff --git a/pkg/kernel/test/binary/lazy_reading_test.dart b/pkg/kernel/test/binary/lazy_reading_test.dart
index 601cb4e..7edfda9 100644
--- a/pkg/kernel/test/binary/lazy_reading_test.dart
+++ b/pkg/kernel/test/binary/lazy_reading_test.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/binary/ast_from_binary.dart';
import 'package:kernel/src/tool/find_referenced_libraries.dart';
import 'utils.dart';
diff --git a/pkg/kernel/test/binary/library_flags_test.dart b/pkg/kernel/test/binary/library_flags_test.dart
index 04630d7..0f80d24 100644
--- a/pkg/kernel/test/binary/library_flags_test.dart
+++ b/pkg/kernel/test/binary/library_flags_test.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 'utils.dart';
/// Test that library flags are serialized and read correctly.
diff --git a/pkg/kernel/test/binary/utils.dart b/pkg/kernel/test/binary/utils.dart
index 1005909..4253db8 100644
--- a/pkg/kernel/test/binary/utils.dart
+++ b/pkg/kernel/test/binary/utils.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:io' show BytesBuilder;
import 'package:kernel/binary/ast_to_binary.dart' show BinaryPrinter;
diff --git a/pkg/kernel/test/binary_bench.dart b/pkg/kernel/test/binary_bench.dart
index a30296a..be0a341 100644
--- a/pkg/kernel/test/binary_bench.dart
+++ b/pkg/kernel/test/binary_bench.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 files contains methods for benchmarking Kernel binary serialization
// and deserialization routines.
diff --git a/pkg/kernel/test/class_hierarchy_basic.dart b/pkg/kernel/test/class_hierarchy_basic.dart
index b2b9322..1a9b34e 100644
--- a/pkg/kernel/test/class_hierarchy_basic.dart
+++ b/pkg/kernel/test/class_hierarchy_basic.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 kernel.class_hierarchy_basic;
import 'package:kernel/class_hierarchy.dart';
diff --git a/pkg/kernel/test/class_hierarchy_bench.dart b/pkg/kernel/test/class_hierarchy_bench.dart
index 0026781..97d3dcd 100644
--- a/pkg/kernel/test/class_hierarchy_bench.dart
+++ b/pkg/kernel/test/class_hierarchy_bench.dart
@@ -2,6 +2,9 @@
// Copyright (c) 2016, 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
+
import 'package:kernel/kernel.dart';
import 'package:kernel/class_hierarchy.dart';
import 'package:kernel/core_types.dart';
diff --git a/pkg/kernel/test/class_hierarchy_membench.dart b/pkg/kernel/test/class_hierarchy_membench.dart
index a8763fb..2c65048 100644
--- a/pkg/kernel/test/class_hierarchy_membench.dart
+++ b/pkg/kernel/test/class_hierarchy_membench.dart
@@ -2,6 +2,9 @@
// Copyright (c) 2016, 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
+
import 'package:kernel/kernel.dart';
import 'package:kernel/class_hierarchy.dart';
import 'package:kernel/core_types.dart';
diff --git a/pkg/kernel/test/class_hierarchy_self_check.dart b/pkg/kernel/test/class_hierarchy_self_check.dart
index 7bb0462..182a2b7 100644
--- a/pkg/kernel/test/class_hierarchy_self_check.dart
+++ b/pkg/kernel/test/class_hierarchy_self_check.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';
import 'package:kernel/class_hierarchy.dart';
import 'package:kernel/core_types.dart';
diff --git a/pkg/kernel/test/class_hierarchy_test.dart b/pkg/kernel/test/class_hierarchy_test.dart
index 8cfe61d..841f5b9 100644
--- a/pkg/kernel/test/class_hierarchy_test.dart
+++ b/pkg/kernel/test/class_hierarchy_test.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:expect/minitest.dart";
import "package:kernel/ast.dart";
diff --git a/pkg/kernel/test/class_hierarchy_test_disabled.dart b/pkg/kernel/test/class_hierarchy_test_disabled.dart
index d1cd156..5cba5d7 100644
--- a/pkg/kernel/test/class_hierarchy_test_disabled.dart
+++ b/pkg/kernel/test/class_hierarchy_test_disabled.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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
+
import 'package:kernel/kernel.dart';
import 'package:test/test.dart';
import 'class_hierarchy_self_check.dart';
diff --git a/pkg/kernel/test/convert_field_to_setter_getter.dart b/pkg/kernel/test/convert_field_to_setter_getter.dart
index d449735..8cc17a4 100644
--- a/pkg/kernel/test/convert_field_to_setter_getter.dart
+++ b/pkg/kernel/test/convert_field_to_setter_getter.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/binary/ast_from_binary.dart';
import 'package:kernel/binary/ast_to_binary.dart';
import 'binary/utils.dart';
diff --git a/pkg/kernel/test/dart_type_equivalence_test.dart b/pkg/kernel/test/dart_type_equivalence_test.dart
index 462c637..aeb980e 100644
--- a/pkg/kernel/test/dart_type_equivalence_test.dart
+++ b/pkg/kernel/test/dart_type_equivalence_test.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:expect/expect.dart" show Expect;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/kernel/test/flatten_test.dart b/pkg/kernel/test/flatten_test.dart
index 6983445..00c707a 100644
--- a/pkg/kernel/test/flatten_test.dart
+++ b/pkg/kernel/test/flatten_test.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:expect/expect.dart" show Expect;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/kernel/test/future_value_type_test.dart b/pkg/kernel/test/future_value_type_test.dart
index 8a7bfac..5eed73f 100644
--- a/pkg/kernel/test/future_value_type_test.dart
+++ b/pkg/kernel/test/future_value_type_test.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:expect/expect.dart" show Expect;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/kernel/test/graph_test.dart b/pkg/kernel/test/graph_test.dart
index 8a84aaf..28668f6 100644
--- a/pkg/kernel/test/graph_test.dart
+++ b/pkg/kernel/test/graph_test.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.md file.
+// @dart = 2.9
+
library kernel.test.graph_test;
import 'package:expect/expect.dart' show Expect;
diff --git a/pkg/kernel/test/heap_test.dart b/pkg/kernel/test/heap_test.dart
index 32b294e..95071ef 100644
--- a/pkg/kernel/test/heap_test.dart
+++ b/pkg/kernel/test/heap_test.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/src/heap.dart';
import 'package:test/test.dart';
diff --git a/pkg/kernel/test/import_table_test.dart b/pkg/kernel/test/import_table_test.dart
index daef20e..62c10f0 100644
--- a/pkg/kernel/test/import_table_test.dart
+++ b/pkg/kernel/test/import_table_test.dart
@@ -1,3 +1,9 @@
+// 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
+
import 'package:kernel/import_table.dart';
main() {
diff --git a/pkg/kernel/test/legacy_erasure_test.dart b/pkg/kernel/test/legacy_erasure_test.dart
index 0a0902b..f62eba0 100644
--- a/pkg/kernel/test/legacy_erasure_test.dart
+++ b/pkg/kernel/test/legacy_erasure_test.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:expect/expect.dart" show Expect;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/kernel/test/load_concat_dill_keeps_source_test.dart b/pkg/kernel/test/load_concat_dill_keeps_source_test.dart
index a888455..60af31f 100644
--- a/pkg/kernel/test/load_concat_dill_keeps_source_test.dart
+++ b/pkg/kernel/test/load_concat_dill_keeps_source_test.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
+
// Test that 79cc54e51924cd5a6bdc2bd1771f2d0ee7af8899 works as intended.
import 'dart:convert';
diff --git a/pkg/kernel/test/metadata_test.dart b/pkg/kernel/test/metadata_test.dart
index 5b362f1..377ad22 100644
--- a/pkg/kernel/test/metadata_test.dart
+++ b/pkg/kernel/test/metadata_test.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:convert';
import 'dart:io';
diff --git a/pkg/kernel/test/nnbd_top_merge_test.dart b/pkg/kernel/test/nnbd_top_merge_test.dart
index bd82a7e..1296889 100644
--- a/pkg/kernel/test/nnbd_top_merge_test.dart
+++ b/pkg/kernel/test/nnbd_top_merge_test.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:expect/expect.dart" show Expect;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/kernel/test/non_null_test.dart b/pkg/kernel/test/non_null_test.dart
index d9a04aa..c4f2570 100644
--- a/pkg/kernel/test/non_null_test.dart
+++ b/pkg/kernel/test/non_null_test.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:expect/expect.dart" show Expect;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/kernel/test/norm_test.dart b/pkg/kernel/test/norm_test.dart
index c287025..5fe8429 100644
--- a/pkg/kernel/test/norm_test.dart
+++ b/pkg/kernel/test/norm_test.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:expect/expect.dart" show Expect;
import 'package:kernel/ast.dart' hide MapEntry;
diff --git a/pkg/kernel/test/regression_37753_test.dart b/pkg/kernel/test/regression_37753_test.dart
index c5448ac..f653337 100644
--- a/pkg/kernel/test/regression_37753_test.dart
+++ b/pkg/kernel/test/regression_37753_test.dart
@@ -1,7 +1,9 @@
// 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
+
// Regression test for https://github.com/dart-lang/sdk/issues/37753.
// A missing piece of transform logic caused nested sync* set to a variable
// to not get transformed, which would either fail an assert or crash.
diff --git a/pkg/kernel/test/regression_40662_test.dart b/pkg/kernel/test/regression_40662_test.dart
index 140d34c..77eaf47 100644
--- a/pkg/kernel/test/regression_40662_test.dart
+++ b/pkg/kernel/test/regression_40662_test.dart
@@ -1,7 +1,9 @@
// 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
+
// Regression test for https://github.com/dart-lang/sdk/issues/40662.
import "package:expect/expect.dart" show Expect;
diff --git a/pkg/kernel/test/relink_test.dart b/pkg/kernel/test/relink_test.dart
index 37b0f7d..b50be8e 100644
--- a/pkg/kernel/test/relink_test.dart
+++ b/pkg/kernel/test/relink_test.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/binary/ast_from_binary.dart';
import 'package:kernel/binary/ast_to_binary.dart';
import 'package:kernel/src/tool/find_referenced_libraries.dart';
diff --git a/pkg/kernel/test/round_trip.dart b/pkg/kernel/test/round_trip.dart
index 271293a..3766db0 100644
--- a/pkg/kernel/test/round_trip.dart
+++ b/pkg/kernel/test/round_trip.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.round_trip;
import 'dart:io';
diff --git a/pkg/kernel/test/round_trip_self_check.dart b/pkg/kernel/test/round_trip_self_check.dart
index a299f26..da2e0e1 100644
--- a/pkg/kernel/test/round_trip_self_check.dart
+++ b/pkg/kernel/test/round_trip_self_check.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.round_trip_test;
import 'self_check_util.dart';
diff --git a/pkg/kernel/test/self_check_util.dart b/pkg/kernel/test/self_check_util.dart
index 1ebdd39..e742142 100644
--- a/pkg/kernel/test/self_check_util.dart
+++ b/pkg/kernel/test/self_check_util.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:async';
import 'package:kernel/src/tool/batch_util.dart';
diff --git a/pkg/kernel/test/serialize_bench.dart b/pkg/kernel/test/serialize_bench.dart
index 3957ddb..0a413f9 100644
--- a/pkg/kernel/test/serialize_bench.dart
+++ b/pkg/kernel/test/serialize_bench.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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
+
import 'package:kernel/kernel.dart';
import 'dart:io';
diff --git a/pkg/kernel/test/text_serializer_from_kernel_nodes_test.dart b/pkg/kernel/test/text_serializer_from_kernel_nodes_test.dart
index 00d1973..41daa56 100644
--- a/pkg/kernel/test/text_serializer_from_kernel_nodes_test.dart
+++ b/pkg/kernel/test/text_serializer_from_kernel_nodes_test.dart
@@ -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 kernel.text_serializer_from_kernel_nodes_test;
import 'package:kernel/ast.dart';
diff --git a/pkg/kernel/test/text_serializer_test.dart b/pkg/kernel/test/text_serializer_test.dart
index 521aca4..e04d07e 100644
--- a/pkg/kernel/test/text_serializer_test.dart
+++ b/pkg/kernel/test/text_serializer_test.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2018, 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 kernel.text_serializer_test;
import 'package:kernel/ast.dart';
diff --git a/pkg/kernel/test/type_hashcode_quality.dart b/pkg/kernel/test/type_hashcode_quality.dart
index d90183a..f33541e 100644
--- a/pkg/kernel/test/type_hashcode_quality.dart
+++ b/pkg/kernel/test/type_hashcode_quality.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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
+
import 'package:kernel/kernel.dart';
import 'dart:io';
diff --git a/pkg/kernel/test/type_hashcode_test.dart b/pkg/kernel/test/type_hashcode_test.dart
index b988507..9a16a72 100644
--- a/pkg/kernel/test/type_hashcode_test.dart
+++ b/pkg/kernel/test/type_hashcode_test.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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
+
import 'package:kernel/kernel.dart';
import 'type_parser.dart';
import 'package:test/test.dart';
diff --git a/pkg/kernel/test/type_parser.dart b/pkg/kernel/test/type_parser.dart
index 62b5a0f..f392821 100644
--- a/pkg/kernel/test/type_parser.dart
+++ b/pkg/kernel/test/type_parser.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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
+
// A very simple parser for a subset of DartTypes for use in testing type
// algebra.
library kernel.test.type_parser;
diff --git a/pkg/kernel/test/type_parser_test.dart b/pkg/kernel/test/type_parser_test.dart
index 5a2e651..e015daa 100644
--- a/pkg/kernel/test/type_parser_test.dart
+++ b/pkg/kernel/test/type_parser_test.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:expect/expect.dart' show Expect;
import 'package:kernel/testing/type_parser.dart';
diff --git a/pkg/kernel/test/type_substitute_bounds_test.dart b/pkg/kernel/test/type_substitute_bounds_test.dart
index 7fb556c..c92d17a 100644
--- a/pkg/kernel/test/type_substitute_bounds_test.dart
+++ b/pkg/kernel/test/type_substitute_bounds_test.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.type_substitute_bounds_test;
import 'package:kernel/kernel.dart';
diff --git a/pkg/kernel/test/type_substitution_identity_test.dart b/pkg/kernel/test/type_substitution_identity_test.dart
index d8fabbd..99d7fe7 100644
--- a/pkg/kernel/test/type_substitution_identity_test.dart
+++ b/pkg/kernel/test/type_substitution_identity_test.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';
import 'package:kernel/type_algebra.dart';
import 'type_parser.dart';
diff --git a/pkg/kernel/test/typedef_unalias_test.dart b/pkg/kernel/test/typedef_unalias_test.dart
index 4f70f04..18be629 100644
--- a/pkg/kernel/test/typedef_unalias_test.dart
+++ b/pkg/kernel/test/typedef_unalias_test.dart
@@ -1,6 +1,9 @@
// Copyright (c) 2016, 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 kernel.typedef_unalias_test;
import 'package:kernel/ast.dart';
diff --git a/pkg/kernel/test/verify_bench.dart b/pkg/kernel/test/verify_bench.dart
index c5fc42e..6326b89 100644
--- a/pkg/kernel/test/verify_bench.dart
+++ b/pkg/kernel/test/verify_bench.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:io';
import 'package:kernel/kernel.dart';
diff --git a/pkg/kernel/test/verify_self_check.dart b/pkg/kernel/test/verify_self_check.dart
index bc9b184..bb2cd02 100644
--- a/pkg/kernel/test/verify_self_check.dart
+++ b/pkg/kernel/test/verify_self_check.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';
import 'package:kernel/verifier.dart';
diff --git a/pkg/kernel/test/verify_test.dart b/pkg/kernel/test/verify_test.dart
index 5d3f20d..7b6a238 100644
--- a/pkg/kernel/test/verify_test.dart
+++ b/pkg/kernel/test/verify_test.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 'package:kernel/text/ast_to_text.dart';
import 'package:kernel/verifier.dart';
diff --git a/pkg/kernel/tool/smoke_test_quick.dart b/pkg/kernel/tool/smoke_test_quick.dart
index b5a0b9a..6ca6e19 100644
--- a/pkg/kernel/tool/smoke_test_quick.dart
+++ b/pkg/kernel/tool/smoke_test_quick.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:io';
final String repoDir = _computeRepoDir();
diff --git a/pkg/vm/bin/kernel_service.dart b/pkg/vm/bin/kernel_service.dart
index 5f226e7..a0fc1de 100644
--- a/pkg/vm/bin/kernel_service.dart
+++ b/pkg/vm/bin/kernel_service.dart
@@ -23,9 +23,7 @@
import 'dart:async' show Future, ZoneSpecification, runZoned;
import 'dart:collection' show UnmodifiableMapBase;
import 'dart:convert' show utf8;
-import 'dart:io'
- show Directory, File, Platform, stderr, stdout
- hide FileSystemEntity;
+import 'dart:io' show Directory, File, Platform, stderr hide FileSystemEntity;
import 'dart:isolate';
import 'dart:typed_data' show Uint8List;
@@ -94,8 +92,7 @@
int nullSafety,
List<String> experimentalFlags,
Uri packagesUri,
- List<String> errors,
- String invocationModes) {
+ List<String> errors) {
final expFlags = <String>[];
if (experimentalFlags != null) {
for (String flag in experimentalFlags) {
@@ -119,33 +116,27 @@
? NnbdMode.Strong
: NnbdMode.Weak
..onDiagnostic = (DiagnosticMessage message) {
- bool printToStdErr = false;
- bool printToStdOut = false;
+ bool printMessage;
switch (message.severity) {
case Severity.error:
case Severity.internalProblem:
// TODO(sigmund): support emitting code with errors as long as they
// are handled in the generated code.
- printToStdErr = false; // errors are printed by VM
+ printMessage = false; // errors are printed by VM
errors.addAll(message.plainTextFormatted);
break;
case Severity.warning:
- printToStdErr = !suppressWarnings;
- break;
case Severity.info:
- printToStdOut = !suppressWarnings;
+ printMessage = !suppressWarnings;
break;
case Severity.context:
case Severity.ignored:
throw "Unexpected severity: ${message.severity}";
}
- if (printToStdErr) {
+ if (printMessage) {
printDiagnosticMessage(message, stderr.writeln);
- } else if (printToStdOut) {
- printDiagnosticMessage(message, stdout.writeln);
}
- }
- ..invocationModes = InvocationMode.parseArguments(invocationModes);
+ };
}
abstract class Compiler {
@@ -157,7 +148,6 @@
final int nullSafety;
final List<String> experimentalFlags;
final String packageConfig;
- final String invocationModes;
// Code coverage and hot reload are only supported by incremental compiler,
// which is used if vm-service is enabled.
@@ -175,8 +165,7 @@
this.experimentalFlags: null,
this.supportCodeCoverage: false,
this.supportHotReload: false,
- this.packageConfig: null,
- this.invocationModes: ''}) {
+ this.packageConfig: null}) {
Uri packagesUri = null;
if (packageConfig != null) {
packagesUri = Uri.parse(packageConfig);
@@ -199,8 +188,7 @@
nullSafety,
experimentalFlags,
packagesUri,
- errors,
- invocationModes);
+ errors);
}
Future<CompilerResult> compile(Uri script) {
@@ -290,8 +278,7 @@
bool enableAsserts: false,
int nullSafety: kNullSafetyOptionUnspecified,
List<String> experimentalFlags: null,
- String packageConfig: null,
- String invocationModes: ''})
+ String packageConfig: null})
: super(isolateId, fileSystem, platformKernelPath,
suppressWarnings: suppressWarnings,
enableAsserts: enableAsserts,
@@ -299,8 +286,7 @@
experimentalFlags: experimentalFlags,
supportHotReload: true,
supportCodeCoverage: true,
- packageConfig: packageConfig,
- invocationModes: invocationModes);
+ packageConfig: packageConfig);
factory IncrementalCompilerWrapper.forExpressionCompilationOnly(
Component component,
@@ -310,15 +296,13 @@
{bool suppressWarnings: false,
bool enableAsserts: false,
List<String> experimentalFlags: null,
- String packageConfig: null,
- String invocationModes: ''}) {
+ String packageConfig: null}) {
IncrementalCompilerWrapper result = IncrementalCompilerWrapper(
isolateId, fileSystem, platformKernelPath,
suppressWarnings: suppressWarnings,
enableAsserts: enableAsserts,
experimentalFlags: experimentalFlags,
- packageConfig: packageConfig,
- invocationModes: invocationModes);
+ packageConfig: packageConfig);
result.generator = new IncrementalCompiler.forExpressionCompilationOnly(
component,
result.options,
@@ -347,8 +331,7 @@
enableAsserts: enableAsserts,
nullSafety: nullSafety,
experimentalFlags: experimentalFlags,
- packageConfig: packageConfig,
- invocationModes: invocationModes);
+ packageConfig: packageConfig);
generator.resetDeltaState();
Component fullComponent = await generator.compile();
@@ -378,15 +361,13 @@
bool enableAsserts: false,
int nullSafety: kNullSafetyOptionUnspecified,
List<String> experimentalFlags: null,
- String packageConfig: null,
- String invocationModes: ''})
+ String packageConfig: null})
: super(isolateId, fileSystem, platformKernelPath,
suppressWarnings: suppressWarnings,
enableAsserts: enableAsserts,
nullSafety: nullSafety,
experimentalFlags: experimentalFlags,
- packageConfig: packageConfig,
- invocationModes: invocationModes);
+ packageConfig: packageConfig);
@override
Future<CompilerResult> compileInternal(Uri script) async {
@@ -422,8 +403,7 @@
List<String> experimentalFlags: null,
String packageConfig: null,
String multirootFilepaths,
- String multirootScheme,
- String invocationModes: ''}) async {
+ String multirootScheme}) async {
IncrementalCompilerWrapper compiler = lookupIncrementalCompiler(isolateId);
if (compiler != null) {
updateSources(compiler, sourceFiles);
@@ -452,8 +432,7 @@
enableAsserts: enableAsserts,
nullSafety: nullSafety,
experimentalFlags: experimentalFlags,
- packageConfig: packageConfig,
- invocationModes: invocationModes);
+ packageConfig: packageConfig);
}
isolateCompilers[isolateId] = compiler;
}
@@ -673,7 +652,10 @@
return utf8.encode(uris.map(_escapeDependency).join(" "));
}
-Future _processListDependenciesRequest(SendPort port, int isolateId) async {
+Future _processListDependenciesRequest(request) async {
+ final SendPort port = request[1];
+ final int isolateId = request[6];
+
final List<Uri> dependencies = isolateDependencies[isolateId] ?? <Uri>[];
CompilationResult result;
@@ -727,34 +709,32 @@
return;
}
+ if (tag == kListDependenciesTag) {
+ await _processListDependenciesRequest(request);
+ return;
+ }
+
if (tag == kNotifyIsolateShutdownTag) {
await _processIsolateShutdownNotification(request);
return;
}
final SendPort port = request[1];
- final int isolateId = request[7];
-
- if (tag == kListDependenciesTag) {
- await _processListDependenciesRequest(port, isolateId);
- return;
- }
-
final String inputFileUri = request[2];
final Uri script =
inputFileUri != null ? Uri.base.resolve(inputFileUri) : null;
final bool incremental = request[4];
- final bool snapshot = request[5];
- final int nullSafety = request[6];
- final List sourceFiles = request[8];
- final bool suppressWarnings = request[9];
- final bool enableAsserts = request[10];
+ final int nullSafety = request[5];
+ final int isolateId = request[6];
+ final List sourceFiles = request[7];
+ final bool suppressWarnings = request[8];
+ final bool enableAsserts = request[9];
final List<String> experimentalFlags =
- request[11] != null ? request[11].cast<String>() : null;
- final String packageConfig = request[12];
- final String multirootFilepaths = request[13];
- final String multirootScheme = request[14];
- final String workingDirectory = request[15];
+ request[10] != null ? request[10].cast<String>() : null;
+ final String packageConfig = request[11];
+ final String multirootFilepaths = request[12];
+ final String multirootScheme = request[13];
+ final String workingDirectory = request[14];
Uri platformKernelPath = null;
List<int> platformKernel = null;
@@ -768,8 +748,6 @@
computePlatformBinariesLocation().resolve('vm_platform_strong.dill');
}
- final String invocationModes = snapshot ? 'compile' : '';
-
Compiler compiler;
// Update the in-memory file system with the provided sources. Currently, only
@@ -814,16 +792,8 @@
packagesUri = Uri.directory(workingDirectory).resolveUri(packagesUri);
}
final List<String> errors = <String>[];
- var options = setupCompilerOptions(
- fileSystem,
- platformKernelPath,
- false,
- false,
- nullSafety,
- experimentalFlags,
- packagesUri,
- errors,
- invocationModes);
+ var options = setupCompilerOptions(fileSystem, platformKernelPath, false,
+ false, nullSafety, experimentalFlags, packagesUri, errors);
// script should only be null for kUpdateSourcesTag.
assert(script != null);
@@ -849,8 +819,7 @@
experimentalFlags: experimentalFlags,
packageConfig: packageConfig,
multirootFilepaths: multirootFilepaths,
- multirootScheme: multirootScheme,
- invocationModes: invocationModes);
+ multirootScheme: multirootScheme);
} else {
FileSystem fileSystem = _buildFileSystem(
sourceFiles, platformKernel, multirootFilepaths, multirootScheme);
@@ -861,8 +830,7 @@
enableAsserts: enableAsserts,
nullSafety: nullSafety,
experimentalFlags: experimentalFlags,
- packageConfig: packageConfig,
- invocationModes: invocationModes);
+ packageConfig: packageConfig);
}
CompilationResult result;
@@ -1006,7 +974,6 @@
scriptUri,
platformKernelPath,
false /* incremental */,
- false /* snapshot */,
kNullSafetyOptionUnspecified /* null safety */,
1 /* isolateId chosen randomly */,
[] /* source files */,
diff --git a/runtime/bin/dfe.cc b/runtime/bin/dfe.cc
index 0a6bc48..f0aa87a 100644
--- a/runtime/bin/dfe.cc
+++ b/runtime/bin/dfe.cc
@@ -182,15 +182,14 @@
Dart_KernelCompilationResult DFE::CompileScript(const char* script_uri,
bool incremental,
- const char* package_config,
- bool snapshot) {
+ const char* package_config) {
// TODO(aam): When Frontend is ready, VM should be passing vm_outline.dill
// instead of vm_platform.dill to Frontend for compilation.
PathSanitizer path_sanitizer(script_uri);
const char* sanitized_uri = path_sanitizer.sanitized_uri();
return Dart_CompileToKernel(sanitized_uri, platform_strong_dill,
- platform_strong_dill_size, incremental, snapshot,
+ platform_strong_dill_size, incremental,
package_config);
}
@@ -199,10 +198,9 @@
intptr_t* kernel_buffer_size,
char** error,
int* exit_code,
- const char* package_config,
- bool snapshot) {
- Dart_KernelCompilationResult result = CompileScript(
- script_uri, use_incremental_compiler(), package_config, snapshot);
+ const char* package_config) {
+ Dart_KernelCompilationResult result =
+ CompileScript(script_uri, use_incremental_compiler(), package_config);
switch (result.status) {
case Dart_KernelCompilationStatus_Ok:
*kernel_buffer = result.kernel;
diff --git a/runtime/bin/dfe.h b/runtime/bin/dfe.h
index 0c38270..eb475bf 100644
--- a/runtime/bin/dfe.h
+++ b/runtime/bin/dfe.h
@@ -59,28 +59,20 @@
// Compiles specified script.
// Returns result from compiling the script.
- //
- // `snapshot` is used by the frontend to determine if compilation
- // related information should be printed to console (e.g., null safety mode).
Dart_KernelCompilationResult CompileScript(const char* script_uri,
bool incremental,
- const char* package_config,
- bool snapshot);
+ const char* package_config);
// Compiles specified script and reads the resulting kernel file.
// If the compilation is successful, returns a valid in memory kernel
// representation of the script, NULL otherwise
// 'error' and 'exit_code' have the error values in case of errors.
- //
- // `snapshot` is used by the frontend to determine if compilation
- // related information should be printed to console (e.g., null safety mode).
void CompileAndReadScript(const char* script_uri,
uint8_t** kernel_buffer,
intptr_t* kernel_buffer_size,
char** error,
int* exit_code,
- const char* package_config,
- bool snapshot);
+ const char* package_config);
// Reads the script kernel file if specified 'script_uri' is a kernel file.
// Returns an in memory kernel representation of the specified script is a
diff --git a/runtime/bin/loader.cc b/runtime/bin/loader.cc
index e855baf..9f62982 100644
--- a/runtime/bin/loader.cc
+++ b/runtime/bin/loader.cc
@@ -198,7 +198,7 @@
uint8_t* kernel_buffer = NULL;
intptr_t kernel_buffer_size = -1;
dfe.CompileAndReadScript(url_string, &kernel_buffer, &kernel_buffer_size,
- &error, &exit_code, NULL, false);
+ &error, &exit_code, NULL);
if (exit_code == 0) {
return Dart_LoadLibraryFromKernel(kernel_buffer, kernel_buffer_size);
} else if (exit_code == kCompilationErrorExitCode) {
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index 12e64808..fec166f 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -298,14 +298,9 @@
}
uint8_t* application_kernel_buffer = NULL;
intptr_t application_kernel_buffer_size = 0;
- // Only pass snapshot = true when generating an AppJIT snapshot to avoid
- // duplicate null-safety info messages from the frontend when generating
- // a kernel snapshot (this flag is instead set in
- // Snapshot::GenerateKernel()).
- const bool snapshot = Options::gen_snapshot_kind() == kAppJIT;
dfe.CompileAndReadScript(script_uri, &application_kernel_buffer,
&application_kernel_buffer_size, error, exit_code,
- resolved_packages_config, snapshot);
+ resolved_packages_config);
if (application_kernel_buffer == NULL) {
Dart_ExitScope();
Dart_ShutdownIsolate();
diff --git a/runtime/bin/snapshot_utils.cc b/runtime/bin/snapshot_utils.cc
index 5168ac5..4a19ba2 100644
--- a/runtime/bin/snapshot_utils.cc
+++ b/runtime/bin/snapshot_utils.cc
@@ -471,7 +471,7 @@
free(kernel_buffer);
} else {
Dart_KernelCompilationResult result =
- dfe.CompileScript(script_name, false, package_config, true);
+ dfe.CompileScript(script_name, false, package_config);
if (result.status != Dart_KernelCompilationStatus_Ok) {
ErrorExit(kErrorExitCode, "%s\n", result.error);
}
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index aae9199..5cff8c3 100644
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -3537,10 +3537,6 @@
*
* \param platform_kernel_size The length of the platform_kernel buffer.
*
- * \param snapshot_compile Set to `true` when the compilation is for a snapshot.
- * This is used by the frontend to determine if compilation related information
- * should be printed to console (e.g., null safety mode).
- *
* \return Returns the result of the compilation.
*
* On a successful compilation the returned [Dart_KernelCompilationResult] has
@@ -3558,7 +3554,6 @@
const uint8_t* platform_kernel,
const intptr_t platform_kernel_size,
bool incremental_compile,
- bool snapshot_compile,
const char* package_config);
typedef struct {
diff --git a/runtime/tests/vm/dart/sdk_hash_test.dart b/runtime/tests/vm/dart/sdk_hash_test.dart
index 0ad4dba..8e31050 100644
--- a/runtime/tests/vm/dart/sdk_hash_test.dart
+++ b/runtime/tests/vm/dart/sdk_hash_test.dart
@@ -35,7 +35,7 @@
]);
Expect.equals('', result.stderr);
Expect.equals(0, result.exitCode);
- Expect.equals('$unsoundNullSafetyMessage\n', result.stdout);
+ Expect.equals('', result.stdout);
}
{
diff --git a/runtime/tests/vm/dart/snapshot_test_helper.dart b/runtime/tests/vm/dart/snapshot_test_helper.dart
index 0de3272..1b578b9 100644
--- a/runtime/tests/vm/dart/snapshot_test_helper.dart
+++ b/runtime/tests/vm/dart/snapshot_test_helper.dart
@@ -39,10 +39,7 @@
void expectOutput(String what, Result result) {
if (result.output != what) {
- reportError(
- result,
- 'Expected test to print \'${what}\' to stdout. '
- 'Actual: ${result.output}');
+ reportError(result, 'Expected test to print \'${what}\' to stdout');
}
}
@@ -130,12 +127,6 @@
final snapshot1Path = p.join(temp, 'snapshot1');
final snapshot2Path = p.join(temp, 'snapshot2');
- if (expectedStdout.isEmpty) {
- expectedStdout = nullSafetyMessage;
- } else {
- expectedStdout = '$nullSafetyMessage\n$expectedStdout';
- }
-
print("Version ${Platform.version}");
final generate1Result = await runDart('GENERATE SNAPSHOT 1', [
@@ -192,15 +183,8 @@
testPath,
'--train'
]);
- expectOutput("$nullSafetyMessage\nOK(Trained)", trainingResult);
+ expectOutput("OK(Trained)", trainingResult);
final runResult = await runSnapshot!(snapshotPath);
expectOutput("OK(Run)", runResult);
});
}
-
-final String nullSafetyMessage =
- hasSoundNullSafety ? soundNullSafetyMessage : unsoundNullSafetyMessage;
-
-const String soundNullSafetyMessage = 'Info: Compiling with sound null safety';
-const String unsoundNullSafetyMessage =
- 'Info: Compiling with unsound null safety';
diff --git a/runtime/tests/vm/dart_2/sdk_hash_test.dart b/runtime/tests/vm/dart_2/sdk_hash_test.dart
index 40f245d..c73dc03 100644
--- a/runtime/tests/vm/dart_2/sdk_hash_test.dart
+++ b/runtime/tests/vm/dart_2/sdk_hash_test.dart
@@ -35,7 +35,7 @@
]);
Expect.equals('', result.stderr);
Expect.equals(0, result.exitCode);
- Expect.equals('$unsoundNullSafetyMessage\n', result.stdout);
+ Expect.equals('', result.stdout);
}
{
diff --git a/runtime/tests/vm/dart_2/snapshot_test_helper.dart b/runtime/tests/vm/dart_2/snapshot_test_helper.dart
index 428cac2..eef877f 100644
--- a/runtime/tests/vm/dart_2/snapshot_test_helper.dart
+++ b/runtime/tests/vm/dart_2/snapshot_test_helper.dart
@@ -39,10 +39,7 @@
void expectOutput(String what, Result result) {
if (result.output != what) {
- reportError(
- result,
- 'Expected test to print \'${what}\' to stdout. '
- 'Actual: ${result.output}');
+ reportError(result, 'Expected test to print \'${what}\' to stdout');
}
}
@@ -130,12 +127,6 @@
final snapshot1Path = p.join(temp, 'snapshot1');
final snapshot2Path = p.join(temp, 'snapshot2');
- if (expectedStdout.isEmpty) {
- expectedStdout = unsoundNullSafetyMessage;
- } else {
- expectedStdout = '$unsoundNullSafetyMessage\n$expectedStdout';
- }
-
print("Version ${Platform.version}");
final generate1Result = await runDart('GENERATE SNAPSHOT 1', [
@@ -192,11 +183,8 @@
testPath,
'--train'
]);
- expectOutput("$unsoundNullSafetyMessage\nOK(Trained)", trainingResult);
+ expectOutput("OK(Trained)", trainingResult);
final runResult = await runSnapshot(snapshotPath);
expectOutput("OK(Run)", runResult);
});
}
-
-const String unsoundNullSafetyMessage =
- 'Info: Compiling with unsound null safety';
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 1bfc864..35356fa 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -6094,7 +6094,6 @@
const uint8_t* platform_kernel,
intptr_t platform_kernel_size,
bool incremental_compile,
- bool snapshot_compile,
const char* package_config) {
API_TIMELINE_DURATION(Thread::Current());
@@ -6103,9 +6102,9 @@
result.status = Dart_KernelCompilationStatus_Unknown;
result.error = Utils::StrDup("Dart_CompileToKernel is unsupported.");
#else
- result = KernelIsolate::CompileToKernel(
- script_uri, platform_kernel, platform_kernel_size, 0, NULL,
- incremental_compile, snapshot_compile, package_config);
+ result = KernelIsolate::CompileToKernel(script_uri, platform_kernel,
+ platform_kernel_size, 0, NULL,
+ incremental_compile, package_config);
if (result.status == Dart_KernelCompilationStatus_Ok) {
Dart_KernelCompilationResult accept_result =
KernelIsolate::AcceptCompilation();
diff --git a/runtime/vm/isolate_reload.cc b/runtime/vm/isolate_reload.cc
index 3445ef8..21ffcf2 100644
--- a/runtime/vm/isolate_reload.cc
+++ b/runtime/vm/isolate_reload.cc
@@ -1048,9 +1048,9 @@
{
const char* root_lib_url = root_lib_url_.ToCString();
TransitionVMToNative transition(Thread::Current());
- retval = KernelIsolate::CompileToKernel(
- root_lib_url, nullptr, 0, modified_scripts_count, modified_scripts,
- true, false, nullptr);
+ retval = KernelIsolate::CompileToKernel(root_lib_url, nullptr, 0,
+ modified_scripts_count,
+ modified_scripts, true, nullptr);
}
if (retval.status != Dart_KernelCompilationStatus_Ok) {
if (retval.kernel != nullptr) {
diff --git a/runtime/vm/kernel_isolate.cc b/runtime/vm/kernel_isolate.cc
index 36bfb1b..9ab6116 100644
--- a/runtime/vm/kernel_isolate.cc
+++ b/runtime/vm/kernel_isolate.cc
@@ -708,7 +708,6 @@
int source_files_count,
Dart_SourceFile source_files[],
bool incremental_compile,
- bool snapshot_compile,
const char* package_config,
const char* multiroot_filepaths,
const char* multiroot_scheme,
@@ -756,10 +755,6 @@
dart_incremental.type = Dart_CObject_kBool;
dart_incremental.value.as_bool = incremental_compile;
- Dart_CObject dart_snapshot;
- dart_snapshot.type = Dart_CObject_kBool;
- dart_snapshot.value.as_bool = snapshot_compile;
-
// TODO(aam): Assert that isolate exists once we move CompileAndReadScript
// compilation logic out of CreateIsolateAndSetupHelper and into
// IsolateSetupHelper in main.cc.
@@ -862,7 +857,6 @@
&uri,
&dart_platform_kernel,
&dart_incremental,
- &dart_snapshot,
&null_safety,
&isolate_id,
&files,
@@ -1014,7 +1008,6 @@
int source_file_count,
Dart_SourceFile source_files[],
bool incremental_compile,
- bool snapshot_compile,
const char* package_config,
const char* multiroot_filepaths,
const char* multiroot_scheme) {
@@ -1040,8 +1033,8 @@
return request.SendAndWaitForResponse(
kCompileTag, kernel_port, script_uri, platform_kernel,
platform_kernel_size, source_file_count, source_files,
- incremental_compile, snapshot_compile, package_config,
- multiroot_filepaths, multiroot_scheme, experimental_flags_, NULL);
+ incremental_compile, package_config, multiroot_filepaths,
+ multiroot_scheme, experimental_flags_, NULL);
}
bool KernelIsolate::DetectNullSafety(const char* script_uri,
@@ -1059,7 +1052,7 @@
KernelCompilationRequest request;
Dart_KernelCompilationResult result = request.SendAndWaitForResponse(
kDetectNullabilityTag, kernel_port, script_uri, nullptr, -1, 0, nullptr,
- false, false, package_config, nullptr, nullptr, experimental_flags_,
+ false, package_config, nullptr, nullptr, experimental_flags_,
original_working_directory);
return result.null_safety;
}
@@ -1075,8 +1068,8 @@
KernelCompilationRequest request;
return request.SendAndWaitForResponse(kListDependenciesTag, kernel_port, NULL,
- NULL, 0, 0, NULL, false, false, NULL,
- NULL, NULL, experimental_flags_, NULL);
+ NULL, 0, 0, NULL, false, NULL, NULL,
+ NULL, experimental_flags_, NULL);
}
Dart_KernelCompilationResult KernelIsolate::AcceptCompilation() {
@@ -1092,7 +1085,7 @@
KernelCompilationRequest request;
return request.SendAndWaitForResponse(kAcceptTag, kernel_port, NULL, NULL, 0,
- 0, NULL, true, false, NULL, NULL, NULL,
+ 0, NULL, true, NULL, NULL, NULL,
experimental_flags_, NULL);
}
@@ -1138,7 +1131,7 @@
KernelCompilationRequest request;
return request.SendAndWaitForResponse(
kUpdateSourcesTag, kernel_port, NULL, NULL, 0, source_files_count,
- source_files, true, false, NULL, NULL, NULL, experimental_flags_, NULL);
+ source_files, true, NULL, NULL, NULL, experimental_flags_, NULL);
}
void KernelIsolate::NotifyAboutIsolateShutdown(const Isolate* isolate) {
diff --git a/runtime/vm/kernel_isolate.h b/runtime/vm/kernel_isolate.h
index f312aee..0aa5221 100644
--- a/runtime/vm/kernel_isolate.h
+++ b/runtime/vm/kernel_isolate.h
@@ -51,7 +51,6 @@
int source_files_count = 0,
Dart_SourceFile source_files[] = NULL,
bool incremental_compile = true,
- bool snapshot_compile = false,
const char* package_config = NULL,
const char* multiroot_filepaths = NULL,
const char* multiroot_scheme = NULL);
diff --git a/runtime/vm/unit_test.cc b/runtime/vm/unit_test.cc
index 0d77711..2a2a861 100644
--- a/runtime/vm/unit_test.cc
+++ b/runtime/vm/unit_test.cc
@@ -322,8 +322,7 @@
Zone* zone = Thread::Current()->zone();
Dart_KernelCompilationResult result = KernelIsolate::CompileToKernel(
url, platform_strong_dill, platform_strong_dill_size, sourcefiles_count,
- sourcefiles, incrementally, false, NULL, multiroot_filepaths,
- multiroot_scheme);
+ sourcefiles, incrementally, NULL, multiroot_filepaths, multiroot_scheme);
if (result.status == Dart_KernelCompilationStatus_Ok) {
if (KernelIsolate::AcceptCompilation().status !=
Dart_KernelCompilationStatus_Ok) {
diff --git a/tools/VERSION b/tools/VERSION
index e07d271..c66c431 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
MAJOR 2
MINOR 12
PATCH 0
-PRERELEASE 241
+PRERELEASE 242
PRERELEASE_PATCH 0
\ No newline at end of file
