implement exports, fixes #141

test/codegen/language/reexport_core_helper.dart

Index: test/codegen/language/reexport_core_helper.dart
diff --git a/test/codegen/dir/html_input_b.dart b/test/codegen/language/reexport_core_helper.dart
similarity index 57%
copy from test/codegen/dir/html_input_b.dart
copy to test/codegen/language/reexport_core_helper.dart
index 5a7301568e8e554689e80211c23f92b98a356b5e..49798aa483b6602490991fcd368dda37d9566f20 100644
--- a/test/codegen/dir/html_input_b.dart
+++ b/test/codegen/language/reexport_core_helper.dart
@@ -1,8 +1,8 @@
-// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
-export 'html_input_d.dart';
+library reexport_core_helper;
 
-int x = 3;
+export 'dart:core';