Dart2js bug only applies to unchecked mode.

tests/lib/async/stream_state_test.dart

 // 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.
 
 // Test the event/callback protocol of the stream implementations.
 library stream_state_test;
 
 import "../../../pkg/unittest/lib/unittest.dart";
 import "stream_state_helper.dart";
 
@@ skipping 16 matching lines @@
      ..expectData(42)
      ..expectDone()
      ..expectBroadcastCancelOpt()
      ..expectCancel(t.terminate);
     t..listen()..add(42)..close();
   });
 
   test("$p-data-done-sub-sync", () {
     var t = asBroadcast ? new StreamProtocolTest.asBroadcast(sync: sync)
                         : new StreamProtocolTest(sync: sync);
-    t.trace = true;
     t..expectListen()
      ..expectBroadcastListenOpt()
      ..expectData(42)
      ..expectDone()
      ..expectBroadcastCancelOpt()
      ..expectCancel(t.terminate);
     t..add(42)..close()..listen();
   });
 
   test("$p-data-done-sub-async", () {
@@ skipping 71 matching lines @@
       t..expectPause();
     }
     t..expectDone()
      ..expectBroadcastCancelOpt()
      ..expectCancel(t.terminate);
     t..listen()
      ..add(42)
      ..close();
   });
 }