Very simple version of Isolates.

tests/standalone/issue14236_source.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.
 //
 // This is the original dart program that was used to generate the snapshot
 // in file issue14236_test.dart
 // The original test/main has been commented out and we have a test/main which
 // throws an error to ensure that this file is not executed as part of the
 // test.
 
 library test.issue14236;
 import 'dart:isolate';
 import "package:expect/expect.dart";
 
 /*
-test() {
-  port.receive((msg, reply) => reply.send(msg));
+test(SendPort replyTo) {
+  replyTo.send("from Isolate");
 }
 
 main() {
+  asyncStart();
   ReceivePort port = new ReceivePort();
-  port.receive((msg, reply) => port.close());
-
-  SendPort s = spawnFunction(test);
-  s.send('hi', port.toSendPort());
+  Isolate.spawn(test, port.sendPort);
+  port.first.then((msg) {
+    Expect.equals("from Isolate", msg);
+    asyncEnd();
+  });
 }
 */
 
 test() {
   Expect.fail("Don't expect this to run at all");
 }
 main() {
   Expect.fail("Don't expect this to run at all");
 }