anchor.diff:  import 'dart:async';
   
   typedef void DataFunction(Response, String);
  +
   typedef void DoneFunction(Response);
   
   class Response {
  
positive.code:     _header.add(entry.toString());
    }
  
  }
negative.code:         cancelOnError: false);
    }
  
    StreamSink<String> get output => _output;
  
    void close() {
      _output.close();
    }
  
  