code: func NewUploadPackResponseWithPackfile(req *UploadPackRequest,
  	pf io.ReadCloser) *UploadPackResponse {
  
  	r := NewUploadPackResponse(req)
  	r.r = pf
  	return r
  }
docs: // NewUploadPackResponseWithPackfile creates a new UploadPackResponse instance,
  // and sets its packfile reader.