Very simple version of Isolates.

runtime/tests/vm/dart/isolate_mirror_remote_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 checking implemention of MirrorSystem when
 // inspecting a remote isolate.
 
 library isolate_mirror_local_test;
 
 import "package:expect/expect.dart";
 import 'dart:isolate';
 import 'dart:mirrors';
 
-void isolateMain() {
-  port.receive(
-      (msg, replyPort) {
-        Expect.fail('Received unexpected message $msg in remote isolate.');
-      });
+void isolateMain(SendPort replyTo) {
+  var port = new ReceivePort();
+  replyTo.send(port.sendPort);
 }
 
 void testMirrorSystem(MirrorSystem mirror) {
   Expect.fail('Should not reach here.  Remote isolates not implemented.');
 }
 
 void main() {
-  SendPort sp = spawnFunction(isolateMain);
-  try {
-    mirrorSystemOf(sp).then(testMirrorSystem);
-    Expect.fail('Should not reach here.  Remote isolates not implemented.');
-  } catch (exception) {
-    Expect.isTrue(exception is UnimplementedError);
-  }
+  var response = new ReceivePort();
+  Isolate.spawn(isolateMain, response.sendPort);
+  response.first.then((sp) {
+    try {
+      mirrorSystemOf(sp).then(testMirrorSystem);
+      Expect.fail('Should not reach here.  Remote isolates not implemented.');
+    } catch (exception) {
+      Expect.isTrue(exception is UnimplementedError);
+    }
+  });
 }