Introduces "--initializing-formal-access".

pkg/compiler/lib/src/options.dart

 // 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 dart2js.src.options;
 
 import 'commandline_options.dart' show Flags;
 import '../compiler.dart' show PackagesDiscoveryProvider;
 
 /// Options used for parsing.
@@ skipping 131 matching lines @@
   final bool dumpInfo;
 
   /// Whether we allow passing an extra argument to `assert`, containing a
   /// reason for why an assertion fails. (experimental)
   final bool enableAssertMessage;
 
   /// Support parsing of generic method declarations, and invocations of
   /// methods where type arguments are passed.
   final bool enableGenericMethodSyntax;
 
+  /// Support access to initializing formal constructor arguments, e.g., the
+  /// use of `x` to initialize `y` in `C(this.x) : y = x`.
+  final bool enableInitializingFormalAccess;
+
   /// Whether the user specified a flag to allow the use of dart:mirrors. This
   /// silences a warning produced by the compiler.
   final bool enableExperimentalMirrors;
 
   /// Whether to enable minification
   // TODO(sigmund): rename to minify
   final bool enableMinification;
 
   /// Whether to model which native classes are live based on annotations on the
   /// core libraries. If false, all native classes will be included by default.
@@ skipping 123 matching lines @@
         shownPackageWarnings:
             _extractOptionalCsvOption(options, Flags.showPackageWarnings),
         disableInlining: _hasOption(options, Flags.disableInlining),
         disableTypeInference: _hasOption(options, Flags.disableTypeInference),
         dumpInfo: _hasOption(options, Flags.dumpInfo),
         emitJavaScript: !(_hasOption(options, '--output-type=dart') ||
             _hasOption(options, '--output-type=dart-multi')),
         enableAssertMessage: _hasOption(options, Flags.enableAssertMessage),
         enableGenericMethodSyntax:
             _hasOption(options, Flags.genericMethodSyntax),
+        enableInitializingFormalAccess:
+            _hasOption(options, Flags.initializingFormalAccess),
         enableExperimentalMirrors:
             _hasOption(options, Flags.enableExperimentalMirrors),
         enableMinification: _hasOption(options, Flags.minify),
         enableNativeLiveTypeAnalysis:
             !_hasOption(options, Flags.disableNativeLiveTypeAnalysis),
         enableTypeAssertions: _hasOption(options, Flags.enableCheckedMode),
         enableUserAssertions: _hasOption(options, Flags.enableCheckedMode),
         generateCodeWithCompileTimeErrors:
             _hasOption(options, Flags.generateCodeWithCompileTimeErrors),
         generateSourceMap: !_hasOption(options, Flags.noSourceMaps),
@@ skipping 49 matching lines @@
       bool terseDiagnostics: false,
       bool suppressWarnings: false,
       bool suppressHints: false,
       List<String> shownPackageWarnings: null,
       bool disableInlining: false,
       bool disableTypeInference: false,
       bool dumpInfo: false,
       bool emitJavaScript: true,
       bool enableAssertMessage: false,
       bool enableGenericMethodSyntax: false,
+      bool enableInitializingFormalAccess: false,
       bool enableExperimentalMirrors: false,
       bool enableMinification: false,
       bool enableNativeLiveTypeAnalysis: true,
       bool enableTypeAssertions: false,
       bool enableUserAssertions: false,
       bool generateCodeWithCompileTimeErrors: false,
       bool generateSourceMap: true,
       bool hasIncrementalSupport: false,
       Uri outputUri: null,
       Uri platformConfigUri: null,
@@ skipping 53 matching lines @@
         terseDiagnostics: terseDiagnostics,
         suppressWarnings: suppressWarnings,
         suppressHints: suppressHints,
         shownPackageWarnings: shownPackageWarnings,
         disableInlining: disableInlining || hasIncrementalSupport,
         disableTypeInference: disableTypeInference || !emitJavaScript,
         dumpInfo: dumpInfo,
         emitJavaScript: emitJavaScript,
         enableAssertMessage: enableAssertMessage,
         enableGenericMethodSyntax: enableGenericMethodSyntax,
+        enableInitializingFormalAccess: enableInitializingFormalAccess,
         enableExperimentalMirrors: enableExperimentalMirrors,
         enableMinification: enableMinification,
         enableNativeLiveTypeAnalysis: enableNativeLiveTypeAnalysis,
         enableTypeAssertions: enableTypeAssertions,
         enableUserAssertions: enableUserAssertions,
         generateCodeWithCompileTimeErrors: generateCodeWithCompileTimeErrors,
         generateSourceMap: generateSourceMap,
         hasIncrementalSupport: hasIncrementalSupport,
         outputUri: outputUri,
         platformConfigUri: platformConfigUri ??
@@ skipping 33 matching lines @@
       this.terseDiagnostics: false,
       this.suppressWarnings: false,
       this.suppressHints: false,
       List<String> shownPackageWarnings: null,
       this.disableInlining: false,
       this.disableTypeInference: false,
       this.dumpInfo: false,
       this.emitJavaScript: true,
       this.enableAssertMessage: false,
       this.enableGenericMethodSyntax: false,
+      this.enableInitializingFormalAccess: false,
       this.enableExperimentalMirrors: false,
       this.enableMinification: false,
       this.enableNativeLiveTypeAnalysis: false,
       this.enableTypeAssertions: false,
       this.enableUserAssertions: false,
       this.generateCodeWithCompileTimeErrors: false,
       this.generateSourceMap: true,
       this.hasIncrementalSupport: false,
       this.outputUri: null,
       this.platformConfigUri: null,
@@ skipping 114 matching lines @@
 
 /// Locations of the platform descriptor files relative to the library root.
 const String _clientPlatform = "lib/dart_client.platform";
 const String _serverPlatform = "lib/dart_server.platform";
 const String _sharedPlatform = "lib/dart_shared.platform";
 const String _dart2dartPlatform = "lib/dart2dart.platform";
 
 const String _UNDETERMINED_BUILD_ID = "build number could not be determined";
 const bool _forceIncrementalSupport =
     const bool.fromEnvironment('DART2JS_EXPERIMENTAL_INCREMENTAL_SUPPORT');