Very simple version of Isolates.

utils/testrunner/run_pipeline.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.
 
 /** The default pipeline code for running a test file. */
 library pipeline;
 import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:math';
@@ skipping 42 matching lines @@
 
 /** Pipeline output. */
 List stdout;
 
 /** Pipeline errors. */
 List stderr;
 
 /** Directory where test wrappers are created. */
 String tmpDir;
 
-void main() {
-  port.receive((cfg, replyPort) {
-    config = cfg;
+void main(List<String> args, SendPort replyTo) {
+  var port = new ReceivePort();
+  replyTo.send(port);
+  port.first.then((message) {
+    config = message[0];
+    var replyPort = message[1];
     stdout = new List();
     stderr = new List();
     initPipeline(replyPort);
     startHTTPServerStage();
   });
 }
 
 /** Initial pipeline stage - starts the HTTP server, if appropriate. */
 startHTTPServerStage() {
   if (config["server"]) {
@@ skipping 282 matching lines @@
     cleanup(tempHtmlFile);
     cleanup(tempJsFile);
     cleanup(tempChildDartFile);
     cleanup(tempChildJsFile);
     cleanup(createTempName(tmpDir, "pubspec", "yaml"));
     cleanup(createTempName(tmpDir, "pubspec", "lock"));
     cleanupDir(createTempName(tmpDir, "packages"));
   }
   completePipeline(stdout, stderr, exitcode);
 }