Fixed bug in _ControllerStream.operator==.

sdk/lib/async/stream_controller.dart

 // 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.
 
 part of dart.async;
 
 // -------------------------------------------------------------------
 // Controller for creating and adding events to a stream.
 // -------------------------------------------------------------------
 
@@ skipping 584 matching lines @@
       bool cancelOnError) =>
     _controller._subscribe(onData, onError, onDone, cancelOnError);
 
   // Override == and hashCode so that new streams returned by the same
   // controller are considered equal. The controller returns a new stream
   // each time it's queried, but doesn't have to cache the result.
 
   int get hashCode => _controller.hashCode ^ 0x35323532;
 
   bool operator==(Object other) {
+    if (identical(this, other)) return true;
     if (other is! _ControllerStream) return false;
     _ControllerStream otherStream = other;
-    return identical(otherStream._controller, this);
+    return identical(otherStream._controller, this._controller);
   }
 }
 
 class _ControllerSubscription<T> extends _BufferingStreamSubscription<T> {
   final _StreamControllerLifecycle<T> _controller;
 
   _ControllerSubscription(this._controller,
                           void onData(T data),
                           void onError(Object error),
                           void onDone(),
@@ skipping 67 matching lines @@
   var varData;
 
   _StreamControllerAddStreamState(_StreamController controller,
                                   this.varData,
                                   Stream source) : super(controller, source) {
     if (controller.isPaused) {
       addSubscription.pause();
     }
   }
 }