First step of support for parsing and ignoring generic methods.

pkg/compiler/lib/src/commandline_options.dart

 // Copyright (c) 2015, 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.cmdline.options;
 
 /// Commandline flags used in `dart2js.dart` and/or `apiimpl.dart`.
 class Flags {
   static const String allowMockCompilation = '--allow-mock-compilation';
   static const String allowNativeExtensions = '--allow-native-extensions';
@@ skipping 31 matching lines @@
   static const String trustTypeAnnotations = '--trust-type-annotations';
   static const String trustJSInteropTypeAnnotations =
       '--experimental-trust-js-interop-type-annotations';
   static const String useContentSecurityPolicy = '--csp';
   static const String useCpsIr = '--use-cps-ir';
   static const String verbose = '--verbose';
   static const String version = '--version';
 
   // Experimental flags.
   static const String conditionalDirectives = '--conditional-directives';
+  static const String genericMethods = '--enable-generic-methods';

[floitsch, 2016/02/22 18:40:27]

drop the "enable".

[floitsch, 2016/02/23 10:40:48]

Think about it: make sure this contains "syntax" in the name:
--generic-method-syntax

Otherwise you conflict with the existing flag from the analyzer, and it will
become harder to add the semantic flag (which I would then call
'--generic-methods'.

[eernst, 2016/02/23 12:40:45]

Done.

 }
 
 class Option {
   static const String showPackageWarnings =
       '${Flags.showPackageWarnings}|${Flags.showPackageWarnings}=.*';
 }