Very simple version of Isolates.

pkg/serialization/test/serialization_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 serialization_test;
 
 import 'dart:convert';
 import 'package:unittest/unittest.dart';
 import 'package:serialization/serialization.dart';
 import 'package:serialization/src/serialization_helpers.dart';
@@ skipping 531 matching lines @@
     expect(MirrorSystem.getName(input.simpleName), "Address");
   });
 
   test('round-trip, default format, pass to isolate', () {
       Node n1 = new Node("1"), n2 = new Node("2"), n3 = new Node("3");
       n1.children = [n2, n3];
       n2.parent = n1;
       n3.parent = n1;
       var s = nodeSerializerReflective(n1);
       var output = s.write(n2);
-      var port = spawnFunction(echo);
-      return port.call(output).then(verify);
+      ReceivePort port = new ReceivePort();
+      var remote = Isolate.spawn(echo, [output, port.sendPort]);
+      port.first.then(verify);
   });
 }
 
 /**
  * Verify serialized output that we have passed to an isolate and back.
  */
 void verify(input) {
   var s2 = nodeSerializerReflective(new Node("a"));
   var m2 = s2.read(input);
   var m1 = m2.parent;
@@ skipping 237 matching lines @@
       if (value == key) return each;
     }
     return null;
   }
 }
 
 /**
  * Function used in an isolate to make sure that the output passes through
  * isolate serialization properly.
  */
-void echo() {
-  port.receive((msg, reply) {
-    reply.send(msg);
-  });
+void echo(initialMessage) {
+  var msg = initialMessage[0];
+  var reply = initialMessage[1];
+  reply.send(msg);
 }