Rewrite Futures.

sdk/lib/async/zone.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.
 
 part of dart.async;
 
 /**
  * A Zone represents the asynchronous version of a dynamic extent. Asynchronous
  * callbacks are executed in the zone they have been queued in. For example,
  * the callback of a `future.then` is executed in the same zone as the one where
@@ skipping 323 matching lines @@
 
 /**
  * A zone that executes a callback when the zone is dead.
  */
 class _WaitForCompletionZone extends _ZoneBase {
   final _CompletionCallback _onDone;
 
   _WaitForCompletionZone(_Zone parentZone, this._onDone) : super(parentZone);
 
   /**
-   * Runs the given function asynchronously. Executes the [_onDone] callback
-   * when the zone is done.
+   * Runs the given function.
+   *
+   * Executes the [_onDone] callback when the zone is done.

[Lasse Reichstein Nielsen, 2013/09/10 12:03:53]

Return type is "dynamic"?

[floitsch, 2013/09/10 17:19:14]

Done.

    */
   runWaitForCompletion(void f()) {
     return this._runUnguarded(f);
   }
 
   _dispose() {

[Lasse Reichstein Nielsen, 2013/09/10 12:03:53]

return type should be void.

[floitsch, 2013/09/10 17:19:14]

Done.

     super._dispose();
     _onDone();
   }
 
   String toString() => "WaitForCompletion ${super.toString()}";
 }
 
 typedef void _HandleErrorCallback(error);
 
 /**
@@ skipping 172 matching lines @@
   if (onError == null && onDone == null) return body();
   if (onError == null) {
     _WaitForCompletionZone zone =
         new _WaitForCompletionZone(_Zone._current, onDone);
     return zone.runWaitForCompletion(body);
   }
   if (onDone == null) onDone = _nullDoneHandler;
   _CatchErrorsZone zone = new _CatchErrorsZone(_Zone._current, onError, onDone);
   return zone.runWaitForCompletion(body);
 }