Very simple version of Isolates.

tests/standalone/package/test_folder/folder_isolate.dart

Index: tests/standalone/package/test_folder/folder_isolate.dart
diff --git a/tests/standalone/package/test_folder/folder_isolate.dart b/tests/standalone/package/test_folder/folder_isolate.dart
index 9f822ce87e4ea46b6915930ebdc6d025e898a3e8..1039c642deae07154634c73e064bac922db2fc0f 100644
--- a/tests/standalone/package/test_folder/folder_isolate.dart
+++ b/tests/standalone/package/test_folder/folder_isolate.dart
@@ -4,14 +4,12 @@
 
 library folder_isolate;
 
-// this is a package that's not available to the main isolate
+// This is a package that's not available to the main isolate
 import 'package:folder_lib.dart' as isolate_package;
 import 'dart:isolate';
 
 // This file is spawned from package_isolate_test.dart
-main() {
+main({message}) {
   isolate_package.count = 1;
-  port.receive((msg, replyTo) {
-    replyTo.send('isolate');
-  });
+  message.send('isolate');
 }