Very simple version of Isolates.

tests/language/typed_message_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 isolate communication with
 // typed objects.
 // VMOptions=--checked
 
 library TypedMessageTest;
+import "dart:async";
 import "package:expect/expect.dart";
 import "dart:isolate";
 
-void logMessages() {
+void logMessages(SendPort replyTo) {
   print("Starting log server.");
-  port.receive((List<int> message, SendPort replyTo) {
+  ReceivePort port = new ReceivePort();
+  replyTo.send(port.sendPort);
+  port.first.then((List<int> message) {
     print("Log $message");
     Expect.equals(5, message.length);
     Expect.equals(0, message[0]);
     Expect.equals(1, message[1]);
     Expect.equals(2, message[2]);
     Expect.equals(3, message[3]);
     Expect.equals(4, message[4]);
     port.close();
-    replyTo.send(1, null);
+    replyTo.send(1);
     print("Stopping log server.");
   });
 }
 
 main() {
-  SendPort remote = spawnFunction(logMessages);
+  ReceivePort receivePort = new ReceivePort();
+  Future<Isolate> remote = Isolate.spawn(logMessages, receivePort.sendPort);
   List<int> msg = new List<int>(5);
   for (int i = 0; i < 5; i++) {
     msg[i] = i;
   }
-  remote.call(msg).then((int message) {
-    Expect.equals(1, message);
+  StreamIterator iterator = new StreamIterator(receivePort);
+  iterator.moveNext().then((b) {
+    SendPort sendPort = iterator.current;
+    sendPort.send(msg);
+    return iterator.moveNext();
+  }).then((b) {
+    Expect.equals(1, iterator.current);
+    receivePort.close();
   });
 }