implement exports, fixes #141

test/codegen/language/export_main_test.dart

Index: test/codegen/language/export_main_test.dart
diff --git a/test/samples/imported_file.dart b/test/codegen/language/export_main_test.dart
similarity index 60%
copy from test/samples/imported_file.dart
copy to test/codegen/language/export_main_test.dart
index cc33f029d59a87f8f2d2fba66061dbe2dbec14b9..1e920a70e26345dcbad2a163537ddef0c98b4288 100644
--- a/test/samples/imported_file.dart
+++ b/test/codegen/language/export_main_test.dart
@@ -1,7 +1,5 @@
-// 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.
 
-class A {
-  int a;
-}
+export 'top_level_entry_test.dart';