code: func ParsePortRange(value string) (*PortRange, error) {
  	pr := &PortRange{}
  	err := pr.Set(value)
  	if err != nil {
  		return nil, err
  	}
  	return pr, nil
  }
docs: // ParsePortRange parses a string of the form "min-max", inclusive at both
  // ends, and initializs a new PortRange from it.