code: func (s RefSpec) Src() string {
  	spec := string(s)
  
  	var start int
  	if s.IsForceUpdate() {
  		start = 1
  	} else {
  		start = 0
  	}
  	end := strings.Index(spec, refSpecSeparator)
  
  	return spec[start:end]
  }
docs: // Src return the src side.