Very simple version of Isolates.

tests/isolate/global_error_handler_test.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.
-
-library test;
-
-import 'dart:async';
-import 'dart:isolate';
-
-var firstFunction;
-var finishFunction;
-
-void runFunctions() {
-  try {
-    firstFunction();
-  } catch (e) {
-    new Timer(Duration.ZERO, finishFunction);
-    rethrow;
-  }
-}
-
-void startTest(SendPort finishPort, replyPort) {
-  firstFunction = () { throw new UnsupportedError("ignore exception"); };
-  finishFunction = () { finishPort.send("done"); };
-  new Timer(Duration.ZERO, runFunctions);
-}
-
-runTest() {
-  port.receive(startTest);
-}
-
-bool globalErrorHandler(IsolateUnhandledException e) {
-  return e.source is UnsupportedError && e.source.message == "ignore exception";
-}
-
-main() {
-  var port = new ReceivePort();
-  var timer;
-  SendPort otherIsolate = spawnFunction(runTest, globalErrorHandler);
-  otherIsolate.send(port.toSendPort());
-  port.receive((msg, replyPort) { port.close(); timer.cancel(); });
-  timer = new Timer(const Duration(seconds: 2), () { throw "failed"; });
-}