Handle top-level tear offs.

dart/tests/try/web/program_result.dart

+// Copyright (c) 2014, 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 trydart.test.program_result;
+
+class ProgramResult {
+  final String code;
+
+  final List<String> messages;
+
+  const ProgramResult(this.code, this.messages);
+
+  List<String> messagesWith(String extra) {
+    return new List<String>.from(messages)..add(extra);
+  }
+}