"strings"
)

func changeVolume(s string, f func(s string) string) string {
	vol := filepath.VolumeName(s)
	return f(vol) + s[len(vol):]
}

func main() {
	gopath := changeVolume(os.Args[1], strings.ToLower)
	dir := changeVolume(os.Args[2], strings.ToUpper)
	cmd := exec.Command("go", "run", "hello.go")
	cmd.Dir = dir
	cmd.Env = append(os.Environ(), "GOPATH="+gopath)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

//
// This lets us test a large set of strings for fold-equivalent
// duplicates without making a quadratic number of calls
// to EqualFold. Note that strings.ToUpper and strings.ToLower
// do not have the desired property in some corner cases.
func ToFold(s string) string {
	// Fast path: all ASCII, no upper case.
	// Most paths look like this already.
	for i := 0; i < len(s); i++ {
		c := s[i]

var pathExts struct {
	once sync.Once
	list []string
}

func initPathExts() {
	var exts []string
	x := os.Getenv(`PATHEXT`)
	if x != "" {
		for _, e := range strings.Split(strings.ToLower(x), `;`) {
			if e == "" {
				continue
			}
			if e[0] != '.' {
				e = "." + e
			}
			exts = append(exts, e)
		}
	} else {
		exts = []string{".com", ".exe", ".bat", ".cmd"}
	}

	gopath := os.Args[2]
	switch os.Args[3] {
		case "IDENTITY":
		case "REPLACE_SLASH": gopath = strings.ReplaceAll(gopath, `\`, `/`)
		case "UPPER": gopath = strings.ToUpper(gopath)
		case "LOWER": gopath = strings.ToLower(gopath)
		default: fmt.Fprintln(os.Stderr, "bad op"); os.Exit(1)
	}
	cmd := exec.Command("go", os.Args[4:]...)
	cmd.Dir = dir
	cmd.Env = append(os.Environ(), "GOPATH="+gopath)
	cmd.Stdout = os.Stdout

			}

		case PrefixXACQUIRE:
			if !haveXA {
				haveXA = true
			} else {
				inst.Prefix[i] = PrefixREPN
			}
		}
	}

	// Determine opcode.
	op := strings.ToLower(inst.Op.String())
	if alt := gnuOp[inst.Op]; alt != "" {
		op = alt
	}

	// Determine opcode suffix.
	// Libopcodes omits the suffix if the width of the operation

func (s *scanner) init() {
	for i, c := range s.b {
		if c == '_' {
			s.b[i] = '-'
		}
	}
	s.scan()
}

// restToLower converts the string between start and end to lower case.
func (s *scanner) toLower(start, end int) {
	for i := start; i < end; i++ {
		c := s.b[i]
		if 'A' <= c && c <= 'Z' {
			s.b[i] += 'a' - 'A'
		}
	}
}

func (s *scanner) setError(e error) {

func (s *Symbolizer) Symbolize(mode string, sources plugin.MappingSources, p *profile.Profile) error {
	remote, local, fast, force, demanglerMode := true, true, false, false, ""
	for _, o := range strings.Split(strings.ToLower(mode), ":") {
		switch o {
		case "":
			continue
		case "none", "no":
			return nil
		case "local":
			remote, local = false, true
		case "fastlocal":
			remote, local, fast = false, true, true

// using the github.com/chzyer/readline package.
type readlineUI struct {
	term *term.Terminal
}

func newReadlineUI() driver.UI {
	// disable readline UI in dumb terminal. (golang.org/issue/26254)
	if v := strings.ToLower(os.Getenv("TERM")); v == "" || v == "dumb" {
		return nil
	}
	// test if we can use term.ReadLine
	// that assumes operation in the raw mode.
	oldState, err := term.MakeRaw(0)
	if err != nil {
		return nil
	}

func isGoBinaryCandidate(file string, info fs.FileInfo) bool {
	if info.Mode().IsRegular() && info.Mode()&0111 != 0 {
		return true
	}
	name := strings.ToLower(file)
	switch filepath.Ext(name) {
	case ".so", ".exe", ".dll":
		return true
	default:
		return strings.Contains(name, ".so.")
	}
}

func (t Tag) Tag() language.Tag {
	if t.full != nil {
		return t.full.(language.Tag)
	}
	tag := t.language.Tag()
	if t.language != t.locale {
		loc := t.locale.Tag()
		tag, _ = tag.SetTypeForKey("rg", strings.ToLower(loc.RegionID.String())+"zzzz")
	}
	return tag
}

// IsCompact reports whether this tag is fully defined in terms of ID.
func (t *Tag) IsCompact() bool {
	return t.full == nil
}