port, err := strconv.ParseUint(strings.TrimSpace(portStr), 10, 16)
	if err != nil {
		return 0, fmt.Errorf("failed parsing port %q: %v", portStr, err)
	}
	return uint16(port), nil
}

func parsePorts(portsString string) ([]int, error) {
	portsString = strings.TrimSpace(portsString)
	ports := make([]int, 0)
	if len(portsString) > 0 {
		for _, portStr := range splitPorts(portsString) {

var errNoModules = errors.New("not using modules")

func findImportComment(data []byte) (s string, line int) {
	// expect keyword package
	word, data := parseWord(data)
	if string(word) != "package" {
		return "", 0
	}

	// expect package name
	_, data = parseWord(data)

	// now ready for import comment, a // or /* */ comment
	// beginning and ending on the current line.