anchor.diff:    InputStream get inputStream {
       if (_inputStream == null) {
         _inputStream = new _HttpInputStream(this);
  -      _inputStream._streamMarkedClosed = _dataEndCalled;
       }
       return _inputStream;
     }
  
positive.code:   Map<String, String> _queryParameters;
    _HttpInputStream _inputStream;
    _BufferList _buffer;
    bool _dataEndCalled = false;
    Function _streamErrorHandler;
    _HttpSession _session;
  }
  
negative.code:   InputStream get inputStream {
      if (_inputStream == null) {
        _inputStream = new _HttpInputStream(this);
      }
      return _inputStream;
    }
  