|  | // 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. | 
|  |  | 
|  | import 'package:expect/expect.dart'; | 
|  | import 'package:async_helper/async_helper.dart'; | 
|  | import 'dart:async'; | 
|  |  | 
|  | StackTrace captureStackTrace() { | 
|  | try { | 
|  | throw 0; | 
|  | } catch (e, st) { | 
|  | return st; | 
|  | } | 
|  | } | 
|  |  | 
|  | main() { | 
|  | StackTrace trace = captureStackTrace(); | 
|  | asyncStart(); | 
|  | var f = new Future.error(499, trace); | 
|  | f.then<Null>((_) { | 
|  | throw "Unreachable"; | 
|  | }, onError: (e, st) { | 
|  | Expect.identical(trace, st); | 
|  | asyncEnd(); | 
|  | }); | 
|  | } |