anchor.diff:        )
         .then((_) => port.first)
         .then((bool success) {
  -        exitCode = success ? 0 : 1;
  +        exit(success ? 0 : 1);
         });
     }
     finally {
  
positive.code: 
      runner.deleteSync();
    }
  
    exit(exitCode);
  }
  
  Directory findRoot(Directory start) {
  
negative.code:   }
  
    ReceivePort port = new ReceivePort();
  
    try {
      Isolate
  