Very simple version of Isolates.

tests/isolate/isolate2_negative_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.
 
 // Dart test program for testing that exceptions in other isolates bring down
 // the program.
 
 library isolate2_negative_test;
 import 'dart:isolate';
 import "package:async_helper/async_helper.dart";
 
-void entry() {
+void entry(msg) {
   throw "foo";
 }
 
 main() {
   // We start an asynchronous operation, but since we don't expect to get
   // anything back except an exception there is no asyncEnd().
   // If the exception is not thrown this test will timeout.
   asyncStart();
-  SendPort port = spawnFunction(entry);
+  Isolate.spawn(entry);
 }