Version 2.12.0-0.0.dev

Merge commit 'a6faf8f2f9c221e8a8bb8c0ec585d6befa679057' into 'dev'

Author: Dart CI

.dart_tool/package_config.json

@@ -124,7 +124,7 @@
       "name": "benchmark_harness",
       "rootUri": "../third_party/pkg/benchmark_harness",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "boolean_selector",
@@ -261,7 +261,7 @@
       "name": "ffi",
       "rootUri": "../third_party/pkg/ffi",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "fixnum",
@@ -773,4 +773,4 @@
       "languageVersion": "2.4"
     }
   ]
-}
+}

CHANGELOG.md

@@ -1,4 +1,16 @@
-## 2.11.0
+## 2.12.0
+
+### Language
+
+**Breaking Change** [Null
+Safety](https://dart.dev/null-safety/understanding-null-safety) is now enabled
+by default in all packages with a lower sdk constraint of 2.12.0 or greater.
+Files that are not subject to language versioning (whether because they are not
+contained in a pub package, or because the package that they are contained in
+has no lower sdk constraint) are treated as opted into to null safety by default
+and may report new errors.  Pub packages may be opted out of null safety by
+setting a min sdk constraint in pubspec.yaml of 2.9.0 or less.  Files may be
+opted out of null safety by adding `// @dart=2.9` to the beginning of the file.
 
 ### Core libraries
 

pkg/analyzer/lib/src/dart/analysis/experiments.g.dart

@@ -8,7 +8,7 @@ part of 'experiments.dart';
 
 /// The current version of the Dart language (or, for non-stable releases, the
 /// version of the language currently in the process of being developed).
-const _currentVersion = '2.11.0';
+const _currentVersion = '2.12.0';
 
 /// A map containing information about all known experimental flags.
 final _knownFeatures = <String, ExperimentalFeature>{
@@ -98,7 +98,7 @@ class ExperimentalFeatures {
     isExpired: IsExpired.non_nullable,
     documentation: 'Non Nullable by default',
     experimentalReleaseVersion: Version.parse('2.10.0'),
-    releaseVersion: null,
+    releaseVersion: Version.parse('2.12.0'),
   );
 
   static final nonfunction_type_aliases = ExperimentalFeature(
@@ -175,7 +175,7 @@ class IsEnabledByDefault {
   static const bool extension_methods = true;
 
   /// Default state of the experiment "non-nullable"
-  static const bool non_nullable = false;
+  static const bool non_nullable = true;
 
   /// Default state of the experiment "nonfunction-type-aliases"
   static const bool nonfunction_type_aliases = false;

pkg/compiler/test/codegen/data/tdiv1.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.
 
-//@dart=2.10
+//@dart=2.12
 
 /*member: main:ignore*/
 void main() {

pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart

@@ -24,17 +24,17 @@ enum ExperimentalFlag {
 }
 
 const Version enableAlternativeInvalidationStrategyVersion =
-    const Version(2, 11);
+    const Version(2, 12);
 const Version enableConstantUpdate2018Version = const Version(2, 0);
 const Version enableControlFlowCollectionsVersion = const Version(2, 0);
 const Version enableExtensionMethodsVersion = const Version(2, 6);
-const Version enableNonNullableVersion = const Version(2, 11);
-const Version enableNonfunctionTypeAliasesVersion = const Version(2, 11);
+const Version enableNonNullableVersion = const Version(2, 12);
+const Version enableNonfunctionTypeAliasesVersion = const Version(2, 12);
 const Version enableSetLiteralsVersion = const Version(2, 0);
 const Version enableSpreadCollectionsVersion = const Version(2, 0);
-const Version enableTripleShiftVersion = const Version(2, 11);
-const Version enableValueClassVersion = const Version(2, 11);
-const Version enableVarianceVersion = const Version(2, 11);
+const Version enableTripleShiftVersion = const Version(2, 12);
+const Version enableValueClassVersion = const Version(2, 12);
+const Version enableVarianceVersion = const Version(2, 12);
 
 ExperimentalFlag parseExperimentalFlag(String flag) {
   switch (flag) {
@@ -69,7 +69,7 @@ const Map<ExperimentalFlag, bool> defaultExperimentalFlags = {
   ExperimentalFlag.constantUpdate2018: true,
   ExperimentalFlag.controlFlowCollections: true,
   ExperimentalFlag.extensionMethods: true,
-  ExperimentalFlag.nonNullable: false,
+  ExperimentalFlag.nonNullable: true,
   ExperimentalFlag.nonfunctionTypeAliases: false,
   ExperimentalFlag.setLiterals: true,
   ExperimentalFlag.spreadCollections: true,
@@ -93,31 +93,31 @@ const Map<ExperimentalFlag, bool> expiredExperimentalFlags = {
 };
 
 const Map<ExperimentalFlag, Version> experimentEnabledVersion = {
-  ExperimentalFlag.alternativeInvalidationStrategy: const Version(2, 11),
+  ExperimentalFlag.alternativeInvalidationStrategy: const Version(2, 12),
   ExperimentalFlag.constantUpdate2018: const Version(2, 0),
   ExperimentalFlag.controlFlowCollections: const Version(2, 0),
   ExperimentalFlag.extensionMethods: const Version(2, 6),
-  ExperimentalFlag.nonNullable: const Version(2, 11),
-  ExperimentalFlag.nonfunctionTypeAliases: const Version(2, 11),
+  ExperimentalFlag.nonNullable: const Version(2, 12),
+  ExperimentalFlag.nonfunctionTypeAliases: const Version(2, 12),
   ExperimentalFlag.setLiterals: const Version(2, 0),
   ExperimentalFlag.spreadCollections: const Version(2, 0),
-  ExperimentalFlag.tripleShift: const Version(2, 11),
-  ExperimentalFlag.valueClass: const Version(2, 11),
-  ExperimentalFlag.variance: const Version(2, 11),
+  ExperimentalFlag.tripleShift: const Version(2, 12),
+  ExperimentalFlag.valueClass: const Version(2, 12),
+  ExperimentalFlag.variance: const Version(2, 12),
 };
 
 const Map<ExperimentalFlag, Version> experimentReleasedVersion = {
-  ExperimentalFlag.alternativeInvalidationStrategy: const Version(2, 11),
+  ExperimentalFlag.alternativeInvalidationStrategy: const Version(2, 12),
   ExperimentalFlag.constantUpdate2018: const Version(2, 0),
   ExperimentalFlag.controlFlowCollections: const Version(2, 0),
   ExperimentalFlag.extensionMethods: const Version(2, 6),
   ExperimentalFlag.nonNullable: const Version(2, 10),
-  ExperimentalFlag.nonfunctionTypeAliases: const Version(2, 11),
+  ExperimentalFlag.nonfunctionTypeAliases: const Version(2, 12),
   ExperimentalFlag.setLiterals: const Version(2, 0),
   ExperimentalFlag.spreadCollections: const Version(2, 0),
-  ExperimentalFlag.tripleShift: const Version(2, 11),
-  ExperimentalFlag.valueClass: const Version(2, 11),
-  ExperimentalFlag.variance: const Version(2, 11),
+  ExperimentalFlag.tripleShift: const Version(2, 12),
+  ExperimentalFlag.valueClass: const Version(2, 12),
+  ExperimentalFlag.variance: const Version(2, 12),
 };
 
 const AllowedExperimentalFlags defaultAllowedExperimentalFlags =

pkg/front_end/test/test_generator_test.dart

@@ -223,6 +223,6 @@ class Generator {
   Generator(this.typeParameters, this.beforePlug, this.afterPlug);
 
   String generate(String plug) {
-    return "${beforePlug}${plug}${afterPlug}";
+    return "// @dart = 2.9\n${beforePlug}${plug}${afterPlug}";
   }
 }

pkg/front_end/testcases/general/experiment_release_version/main.dart.outline.expect

@@ -9,23 +9,20 @@
 // // @dart=2.8
 // ^^^^^^^^^^^^
 //
-// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versionedUnallowedPackage; // error
 //    ^
 //
-// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.9 or higher.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_8_AllowedPackage; // error
 //    ^
 //
-// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_9_AllowedPackage; // error
 //    ^
 //
-// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart:7:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? versionedAllowedPackage; // error
 //    ^
 //
@@ -52,8 +49,8 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? unversionedLibrary; // error
 //    ^
 //
@@ -66,8 +63,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.9 or higher.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_8_Library; // error
 //    ^
 //
@@ -80,8 +76,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_9_Library; // error
 //    ^
 //
@@ -94,8 +89,8 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? versioned_2_10_Library; // error
 //    ^
 //

pkg/front_end/testcases/general/experiment_release_version/main.dart.strong.expect

@@ -9,23 +9,20 @@
 // // @dart=2.8
 // ^^^^^^^^^^^^
 //
-// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versionedUnallowedPackage; // error
 //    ^
 //
-// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.9 or higher.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_8_AllowedPackage; // error
 //    ^
 //
-// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_9_AllowedPackage; // error
 //    ^
 //
-// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/not_allowed_package/lib/versioned_2_10_lib.dart:7:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? versionedAllowedPackage; // error
 //    ^
 //
@@ -51,8 +48,8 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? unversionedLibrary; // error
 //    ^
 //
@@ -65,8 +62,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.9 or higher.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_8_Library; // error
 //    ^
 //
@@ -79,8 +75,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_9_Library; // error
 //    ^
 //
@@ -93,8 +88,8 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? versioned_2_10_Library; // error
 //    ^
 //

pkg/front_end/testcases/general/experiment_release_version/main.dart.strong.transformed.expect

@@ -20,8 +20,8 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/unversioned_lib.dart:5:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? unversionedLibrary; // error
 //    ^
 //
@@ -34,8 +34,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental and requires language version of 2.9 or higher.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_8_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_8_Library; // error
 //    ^
 //
@@ -48,8 +47,7 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_9_lib.dart:7:4: Error: This requires the null safety language feature, which requires language version of 2.10 or higher.
 // int? versioned_2_9_Library; // error
 //    ^
 //
@@ -62,8 +60,8 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/experiment_release_version/versioned_2_10_lib.dart:7:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? versioned_2_10_Library; // error
 //    ^
 //

pkg/front_end/testcases/general/null_safety_invalid_experiment.dart.outline.expect

@@ -2,8 +2,8 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/general/null_safety_invalid_experiment.dart:5:4: Error: This requires the null safety language feature, which is experimental.
-// You can enable the experiment using the '--enable-experiment=non-nullable' command line option.
+// pkg/front_end/testcases/general/null_safety_invalid_experiment.dart:5:4: Error: This requires the 'non-nullable' language feature to be enabled.
+// The feature is on by default but is currently disabled, maybe because the '--enable-experiment=no-non-nullable' command line option is passed.
 // int? i;
 //    ^
 //