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