Very simple version of Isolates.

runtime/tests/vm/dart/isolate_mirror_remote_test.dart

Index: runtime/tests/vm/dart/isolate_mirror_remote_test.dart
diff --git a/runtime/tests/vm/dart/isolate_mirror_remote_test.dart b/runtime/tests/vm/dart/isolate_mirror_remote_test.dart
index f3fff3a0b1da06cce051549222ac81ea08ee212d..7b36cfd89f2664305a8217d865920b2845db011f 100644
--- a/runtime/tests/vm/dart/isolate_mirror_remote_test.dart
+++ b/runtime/tests/vm/dart/isolate_mirror_remote_test.dart
@@ -11,11 +11,9 @@ 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) {
@@ -23,11 +21,14 @@ void testMirrorSystem(MirrorSystem mirror) {
 }
 
 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);
+    }
+  });
 }