Remove AsyncError with Expando.

pkg/scheduled_test/lib/src/utils.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.
 
 library utils;
 
 import 'dart:async';
 
 import 'package:stack_trace/stack_trace.dart';
 
@@ skipping 89 matching lines @@
   } catch (_, thrownStackTrace) {
     stackTrace = thrownStackTrace;
   }
 
   var completer = new Completer();
   var subscription;
   subscription = stream.listen((value) {
     subscription.cancel();
     completer.complete(value);
   }, onError: (e) {
-    completer.completeError(e.error, e.stackTrace);
+    completer.completeError(e);
   }, onDone: () {
     completer.completeError(new StateError("No elements"), stackTrace);
   }, cancelOnError: true);
   return completer.future;
 }
 
 /// A function that can be called to cancel a [Stream] and send a done message.
 typedef void StreamCanceller();
 
 // TODO(nweiz): use a StreamSubscription when issue 9026 is fixed.
@@ skipping 65 matching lines @@
 }
 
 /// Returns a string representation of [trace] that has the core and test frames
 /// folded together.
 String terseTraceString(StackTrace trace) {
   return new Trace.from(trace).terse.foldFrames((frame) {
     return frame.package == 'scheduled_test' || frame.package == 'unittest' ||
         frame.isCore;
   }).toString().trim();
 }