implement exports, fixes #141

test/codegen/language/export_helper3.dart

Index: test/codegen/language/export_helper3.dart
diff --git a/tool/input_sdk/lib/core/type.dart b/test/codegen/language/export_helper3.dart
similarity index 63%
copy from tool/input_sdk/lib/core/type.dart
copy to test/codegen/language/export_helper3.dart
index d2e107b6b183f9f674dfba4e7138c195a2d69c19..c4cf3d824978b03fa4176142940d5a6098ac1917 100644
--- a/tool/input_sdk/lib/core/type.dart
+++ b/test/codegen/language/export_helper3.dart
@@ -2,9 +2,11 @@
 // 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.
 
-part of dart.core;
+library export_helper3;
 
-/**
- * Runtime representation of a type.
- */
-abstract class Type {}
+import 'export_helper4.dart';
+export 'export_helper4.dart';
+
+class Exported extends ReExported {
+
+}