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

dart/tests/language/local_export_a.dart

Index: dart/tests/language/local_export_a.dart
diff --git a/dart/tests/language/local_export_a.dart b/dart/tests/language/local_export_a.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e9c8819b0f90165b526b8bbb2ce06f86c19ce14b
--- /dev/null
+++ b/dart/tests/language/local_export_a.dart
@@ -0,0 +1,11 @@
+// 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 'local_export_a_export.dart';
+
+class A {
+  method() => 42;
+}