Remove AsyncError with Expando.

utils/pub/utils.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.
 
 /// Generic utility functions. Stuff that should possibly be in core.
 library utils;
 
 import 'dart:async';
 import 'dart:crypto';
 import 'dart:isolate';
@@ skipping 41 matching lines @@
       _values.add(value);
 
       if (_pending <= 0) {
         completed = true;
         _completer.complete(_values);
       }
     }).catchError((e) {
       if (completed) return;
 
       completed = true;
-      _completer.completeError(e.error, e.stackTrace);
+      _completer.completeError(e);
     }));
 
     return task;
   }
 
   Future<List> get future => _completer.future;
 }
 
 // TODO(rnystrom): Move into String?
 /// Pads [source] to [length] by adding spaces at the end.
@@ skipping 76 matching lines @@
 Future sleep(int milliseconds) {
   var completer = new Completer();
   new Timer(new Duration(milliseconds: milliseconds), completer.complete);
   return completer.future;
 }
 
 /// Configures [future] so that its result (success or exception) is passed on
 /// to [completer].
 void chainToCompleter(Future future, Completer completer) {
   future.then((value) => completer.complete(value),
-      onError: (e) => completer.completeError(e.error, e.stackTrace));
+      onError: (e) => completer.completeError(e));
 }
 
 // TODO(nweiz): remove this when issue 7964 is fixed.
 /// Returns a [Future] that will complete to the first element of [stream].
 /// Unlike [Stream.first], this is safe to use with single-subscription streams.
 Future streamFirst(Stream stream) {
   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"));
   }, cancelOnError: true);
   return completer.future;
 }
 
 /// Returns a wrapped version of [stream] along with a [StreamSubscription] that
 /// can be used to control the wrapped stream.
 Pair<Stream, StreamSubscription> streamWithSubscription(Stream stream) {
   var controller = stream.isBroadcast ?
@@ skipping 167 matching lines @@
         .then((resolved) => new Pair(key, resolved)));
   });
   return Future.wait(pairs).then((resolvedPairs) {
     var map = {};
     for (var pair in resolvedPairs) {
       map[pair.first] = pair.last;
     }
     return map;
   });
 }