Add second argument to Future error handlers.

tests/lib/async/stack_trace23_test.dart

Index: tests/lib/async/stack_trace23_test.dart
diff --git a/tests/lib/async/stack_trace23_test.dart b/tests/lib/async/stack_trace23_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1cde7830c647c8ffc893c35522b54f5bbb53f30c
--- /dev/null
+++ b/tests/lib/async/stack_trace23_test.dart
@@ -0,0 +1,29 @@
+// 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.catchError((e) { throw "unreachable"; }, test: (e) {
+      Expect.equals(499, e);
+      return false;
+    })
+    .catchError((e, st) {
+      Expect.identical(trace, st);
+      asyncEnd();
+    }, test: (e) => e == 499);
+}