- Implement first class types in the VM.

runtime/lib/type_patch.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.
+
+// These Dart classes correspond to the VM internal implementation classes.
+
+// Equivalent of RawAbstractType.
+abstract class _AbstractType implements Type {
+  String toString() native "AbstractType_toString";
+}
+
+// Equivalent of RawType.
+class _Type extends _AbstractType {
+}
+
+// Equivalent of RawTypeParameter.
+class _TypeParameter extends _AbstractType {
+}