mode := perm
	f, err := os.OpenFile(filepath.Clean(dst)+"-go-tmp-umask", os.O_WRONLY|os.O_CREATE|os.O_EXCL, perm)
	if err == nil {
		fi, err := f.Stat()
		if err == nil {
			mode = fi.Mode() & 0777
		}
		name := f.Name()
		f.Close()
		os.Remove(name)
	}

	if err := os.Chmod(src, mode); err == nil {
		if err := os.Rename(src, dst); err == nil {
			if cfg.BuildX {

	}
	os.RemoveAll(dir)
	if err := os.MkdirAll(dir, 0777); err != nil {
		return "", "", err
	}
	if err := os.WriteFile(dir+".info", []byte(key), 0666); err != nil {
		os.RemoveAll(dir)
		return "", "", err
	}
	return dir, lockfile, nil
}

type RunError struct {
	Cmd      string
	Err      error
	Stderr   []byte
	HelpText string
}

	}

	// Reconstruct expected errors by independently "parsing" the input.
	data, err := os.ReadFile(input)
	if err != nil {
		t.Error(err)
		return
	}
	lineno := 0
	lines := strings.Split(string(data), "\n")
	for _, line := range lines {
		lineno++

		fileline := fmt.Sprintf("%s:%d", input, lineno)
		if m := errRE.FindStringSubmatch(line); m != nil {
			all := m[1]

	Init()
	modFilePath := modFilePath(modRoot)
	if _, err := fsys.Stat(modFilePath); err == nil {
		base.Fatalf("go: %s already exists", modFilePath)
	}

	if modPath == "" {
		var err error
		modPath, err = findModulePath(modRoot)
		if err != nil {
			base.Fatal(err)
		}
	} else if err := module.CheckImportPath(modPath); err != nil {
		if pathErr, ok := err.(*module.InvalidPathError); ok {

func copyFile(src, dst string, perm fs.FileMode) error {
	sf, err := os.Open(src)
	if err != nil {
		return err
	}
	defer sf.Close()

	df, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
	if err != nil {
		return err
	}

	_, err = io.Copy(df, sf)
	err2 := df.Close()
	if err != nil {
		return err
	}
	return err2
}

func TestNeedVersion(t *testing.T) {

func DownloadModule(ctx context.Context, m *ModuleJSON) error {
	var err error
	_, file, err := modfetch.InfoFile(ctx, m.Path, m.Version)
	if err != nil {
		return err
	}
	m.Info = file
	m.GoMod, err = modfetch.GoModFile(ctx, m.Path, m.Version)
	if err != nil {
		return err
	}
	m.GoModSum, err = modfetch.GoModSum(ctx, m.Path, m.Version)
	if err != nil {
		return err
	}
	mod := module.Version{Path: m.Path, Version: m.Version}

func (b *Writer) ReadFrom(r io.Reader) (n int64, err error) {
	if b.err != nil {
		return 0, b.err
	}
	readerFrom, readerFromOK := b.wr.(io.ReaderFrom)
	var m int
	for {
		if b.Available() == 0 {
			if err1 := b.Flush(); err1 != nil {
				return n, err1
			}
		}
		if readerFromOK && b.Buffered() == 0 {
			nn, err := readerFrom.ReadFrom(r)
			b.err = err
			n += nn
			return n, err
		}

			}
			if !q.matchesPath(curM.Path) {
				packages, err := r.matchInModule(ctx, q.pattern, curM)
				if len(packages) == 0 {
					if err != nil {
						reportError(q, err)
					}
					continue // curM is not relevant to q.
				}
			}

			rev, err := r.queryModule(ctx, curM.Path, q.version, r.initialSelected)
			if err != nil {
				reportError(q, err)
				continue
			}
			if rev.Version == curM.Version {

		if _, err := fsys.Stat(absDir); err != nil {
			if os.IsNotExist(err) {
				// Canonicalize OS-specific errors to errDirectoryNotFound so that error
				// messages will be easier for users to search for.
				return "", &fs.PathError{Op: "stat", Path: absDir, Err: errDirectoryNotFound}
			}
			return "", err
		}
		if _, noGo := err.(*build.NoGoError); noGo {

Brazil/Acre Brazil/DeNoronha Brazil/East Brazil/West CET CST6CDT Canada/Atlantic Canada/Central Canada/Eastern Canada/Mountain Canada/Newfoundland Canada/Pacific Canada/Saskatchewan Canada/Yukon Chile/Continental Chile/EasterIsland Cuba EET EST EST5EDT Egypt Eire Etc/GMT Etc/GMT+0 Etc/GMT+1 Etc/GMT+10 Etc/GMT+11 Etc/GMT+12 Etc/GMT+2 Etc/GMT+3 Etc/GMT+4 Etc/GMT+5 Etc/GMT+6 Etc/GMT+7 Etc/GMT+8 Etc/GMT+9 Etc/GMT-0 Etc/GMT-1 Etc/GMT-10 Etc/GMT-11 Etc/GMT-12 Etc/GMT-13 Etc/GMT-14 Etc/GMT-2 Etc/GMT-3 Etc/GMT-4 Etc/GMT-5...