anchor.diff:  }
   
   main() {
  +  asyncStart();
     ReceivePort receivePort = new ReceivePort();
     Future<Isolate> remote = Isolate.spawn(logMessages, receivePort.sendPort);
     List<int> msg = new List<int>(5);
  
positive.code:   }).then((b) {
      Expect.equals(1, iterator.current);
      receivePort.close();
    });
  }
  
negative.code: library TypedMessageTest;
  import "dart:async";
  import "package:expect/expect.dart";
  import "package:async_helper/async_helper.dart";
  import "dart:isolate";
  
  void logMessages(SendPort replyTo) {
  