Fix a bug which caused exported elements to conflict with locally defined ones.

dart/tests/language/local_export_a_export.dart

Index: dart/tests/language/local_export_a_export.dart
diff --git a/dart/tests/language/local_export_a_export.dart b/dart/tests/language/local_export_a_export.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1919d385af1507e094a6db3f8e37f823504c79e6
--- /dev/null
+++ b/dart/tests/language/local_export_a_export.dart
@@ -0,0 +1,7 @@
+// 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.
+
+library local_export_a_export;
+
+int A = 0;