Reflection on generics.

runtime/lib/mirrors_impl.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.
 
 // VM-specific implementation of the dart:mirrors library.
 
 import "dart:collection";
 
 // These values are allowed to be passed directly over the wire.
 bool _isSimpleValue(var value) {
@@ skipping 483 matching lines @@
       var mirror;
       for (var i = 0; i < params.length; i += 2) {
         mirror = new _LocalTypeVariableMirrorImpl(
             params[i + 1], params[i], this);
         _typeVariables[mirror.simpleName] = mirror;
       }
     }
     return _typeVariables;
   }
 
+  Map<Symbol, TypeMirror> _typeArguments = null;
   Map<Symbol, TypeMirror> get typeArguments {
-    throw new UnimplementedError(
-        'ClassMirror.typeArguments is not implemented');
+    if(_typeArguments == null) {
+      _typeArguments = _computeTypeArguments(_reflectee);
+    }
+    return _typeArguments;
   }
 
   bool get isOriginalDeclaration {
     throw new UnimplementedError(
         'ClassMirror.isOriginalDeclaration is not implemented');
   }
 
   ClassMirror get genericDeclaration {
     throw new UnimplementedError(
         'ClassMirror.originalDeclaration is not implemented');
@@ skipping 71 matching lines @@
       native 'ClassMirror_invokeGetter';
 
   _invokeSetter(reflectee, setterName, value)
       native 'ClassMirror_invokeSetter';
 
   static _invokeConstructor(reflectee, constructorName, positionalArguments)
       native 'ClassMirror_invokeConstructor';
 
   static _ClassMirror_type_variables(reflectee)
       native "ClassMirror_type_variables";
+
+  static _computeTypeArguments(reflectee)
+      native "ClassMirror_type_arguments";
 }
 
 class _LocalFunctionTypeMirrorImpl extends _LocalClassMirrorImpl
     implements FunctionTypeMirror {
   _LocalFunctionTypeMirrorImpl(reflectee) : super(reflectee, null);
 
   // FunctionTypeMirrors have a simpleName generated from their signature.
   Symbol _simpleName = null;
   Symbol get simpleName {
     if (_simpleName == null) {
@@ skipping 534 matching lines @@
   static Expando<ClassMirror> _classMirrorCache = new Expando("ClassMirror");
   static ClassMirror reflectClass(Type key) {
     var classMirror = _classMirrorCache[key];
     if (classMirror == null) {
       classMirror = makeLocalClassMirror(key);
       _classMirrorCache[key] = classMirror;
     }
     return classMirror;
   }
 }