DeclarationMirror extended with metadata.

tests/compiler/dart2js/mirrors_helper.dart

 // Copyright (c) 2012, 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.
 
 /**
  * This file is read by 'mirrors_test.dart'.
  */
 
 library mirrors_helper;
 
 typedef E Func<E,F extends Foo>(F f);
 
 main() {
 
 }
 
+@Metadata // This is intentionally the type literal.
+@Metadata(null)
+@Metadata(true)
+@Metadata(false)
+@Metadata(0)
+@Metadata(1.5)
+@Metadata("Foo")
+@Metadata(const ["Foo"])
+@Metadata(const {'foo':"Foo"})
+@metadata
 class Foo {
 
 }
 
 abstract class Bar<E> {
 
 }
 
 class Baz<E,F extends Foo> implements Bar<E> {
   Baz();
@@ skipping 19 matching lines @@
   }
 }
 
 class _PrivateClass {
   var _privateField;
   get _privateGetter => _privateField;
   void set _privateSetter(value) => _privateField = value;
   void _privateMethod() {}
   _PrivateClass._privateConstructor();
   factory _PrivateClass._privateFactoryConstructor() => new _PrivateClass();
+}
+
+const metadata = const Metadata(null);
+
+class Metadata {
+  final data;
+  const Metadata(this.data);
 }