Make Future.wait have an eagerError option that defaults to false.

tests/lib/async/futures_test.dart

 // Copyright (c) 2011, 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 futures_test;
 import 'package:async_helper/async_helper.dart';
 import "package:expect/expect.dart";
 import 'dart:async';
 
 Future testWaitEmpty() {
@@ skipping 101 matching lines @@
   c2.completeError('incorrect error 1');
 
   return Future.wait(futures).then((_) {
     throw 'incorrect error 2';
   }).catchError((error, stackTrace) {
     Expect.equals('correct error', error);
     Expect.isNotNull(stackTrace);
   });
 }
 
+Future testEagerWait() {

[floitsch, 2013/11/19 10:50:34]

test not called.

[Lasse Reichstein Nielsen, 2013/11/20 09:29:28]

Whoops. Fixed.

+  Completer c1 = new Completer();
+  Completer c2 = new Completer();
+  List<Future> futures = <Future>[c1.future, c2.future];
+  Future waited = Future.wait(futures, eagerError: true);
+  var result = waited.then((v) { throw "should not be called"; },
+                           onError: (e, s) {

[floitsch, 2013/11/19 10:50:34]

also test that stack trace is passed through.

[Lasse Reichstein Nielsen, 2013/11/20 09:29:28]

Will do.

+                             Expect.equals(e, 42);
+                             returntrue;

[floitsch, 2013/11/19 10:50:34]

return true

[Lasse Reichstein Nielsen, 2013/11/20 09:29:28]

Quite obvious that it isn't called too. :(

+                           });
+  c1.completeError(42);
+  return result;
+}
+
 Future testForEachEmpty() {
   return Future.forEach([], (_) {
     throw 'should not be called';
   });
 }
 
 Future testForEach() {
   var seen = <int>[];
   return Future.forEach([1, 2, 3, 4, 5], (n) {
     seen.add(n);
@@ skipping 28 matching lines @@
   futures.add(testForEachEmpty());
   futures.add(testForEach());
   futures.add(testForEachWithException());
 
   asyncStart();
   Future.wait(futures).then((List list) {
     Expect.equals(11, list.length);
     asyncEnd();
   });
 }