Ensure that errors have stack traces attached.

pkg/barback/lib/src/serialize.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 barback.serialize;
 
 import 'dart:async';
 import 'dart:isolate';
 
 import 'package:stack_trace/stack_trace.dart';
@@ skipping 43 matching lines @@
 
 /// The body of a [StreamTransformer] that deserializes the values in a stream
 /// sent by [serializeStream].
 StreamSubscription _deserializeTransformer(Stream input, bool cancelOnError) {
   var subscription;
   var transformed = input.transform(new StreamTransformer.fromHandlers(
       handleData: (data, sink) {
     if (data['type'] == 'data') {
       sink.add(data['data']);
     } else if (data['type'] == 'error') {
-      sink.addError(new CrossIsolateException.deserialize(data['error']));
+      var exception = new CrossIsolateException.deserialize(data['error']);
+      sink.addError(exception, exception.stackTrace);
     } else {
       assert(data['type'] == 'done');
       sink.close();
       subscription.cancel();
     }
   }));
   subscription = transformed.listen(null, cancelOnError: cancelOnError);
   return subscription;
 }
 
@@ skipping 54 matching lines @@
 // short of a giant pile of type tests for each known exception type.
 //
 // So just try it. If it throws, default to toString().
 String _getErrorMessage(error) {
   try {
     return error.message;
   } on NoSuchMethodError catch (_) {
     return error.toString();
   }
 }