Very simple version of Isolates.

tests/isolate/illegal_msg_stream_test.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.
-
-library test;
-
-import 'package:expect/expect.dart';
-import 'dart:isolate';
-import "package:async_helper/async_helper.dart";
-
-funcFoo(x) => x + 2;
-
-foo() {
-  stream.single.then((msg) {
-    IsolateSink sink = msg;
-    sink.add(499);
-    sink.close();
-  });
-}
-
-main() {
-  var box = new MessageBox();
-  var snd = streamSpawnFunction(foo);
-  var caught_exception = false;
-  try {
-    snd.add(funcFoo);
-  } catch (e) {
-    caught_exception = true;
-  }
-  snd.add(box.sink);
-  snd.close();
-
-  asyncStart();
-  box.stream.single.then((msg) {
-    Expect.equals(499, msg);
-    asyncEnd();
-  });
-}