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