Implement LibraryMirror.metadata.

dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart

 // Copyright (c) 2013, 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 elements.modelx;
 
 import 'dart:collection' show LinkedHashMap;
 
 import 'elements.dart';
 import '../../compiler.dart' as api;
@@ skipping 576 matching lines @@
       origin.patch = this;
     }
   }
 
   bool get isPatched => patch != null;
   bool get isPatch => origin != null;
 
   LibraryElement get declaration => super.declaration;
   LibraryElement get implementation => super.implementation;
 
+  Link<MetadataAnnotation> get metadata {
+    return (libraryTag == null) ? super.metadata : libraryTag.metadata;
+  }
+
+  set metadata(value) {
+    // The metadata is stored on the library name.

[kasperl, 2013/05/30 13:16:39]

name -> tag?

[ahe, 2013/05/30 13:28:45]

Done.

+    throw new SpannableAssertionFailure(this, 'Cannot set metadata on Library');
+  }
+
   CompilationUnitElement getCompilationUnit() => entryCompilationUnit;
 
   void addCompilationUnit(CompilationUnitElement element) {
     compilationUnits = compilationUnits.prepend(element);
   }
 
   void addTag(LibraryTag tag, DiagnosticListener listener) {
     tags = tags.prepend(tag);
   }
 
@@ skipping 1491 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }