t.Skip("skipping; no GOROOT available")
	}

	goroot, err := filepath.EvalSymlinks(runtime.GOROOT())
	if err != nil {
		t.Fatal("error evaluating GOROOT: ", err)
	}
	var files []string
	err = filepath.WalkDir(goroot, func(path string, info fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if !info.IsDir() && strings.HasSuffix(path, ".gz") {
			files = append(files, path)
		}
		return nil
	})

    private final FileSystem fileSystem;

    public ReproducibleDirectoryWalker(FileSystem fileSystem) {
        this.fileSystem = fileSystem;
    }

    @Override
    public void walkDir(Path rootDir, RelativePath rootPath, FileVisitor visitor, Spec<? super FileTreeElement> spec, AtomicBoolean stopFlag, boolean postfix) {
        try {

		}
		return // ignore files under -root
	}

	// otherwise, test all Go files under *root
	goroot := *root
	if goroot == "" {
		goroot = testenv.GOROOT(t)
	}
	filepath.WalkDir(goroot, handleFile)
}

func TestAll(t *testing.T) {
	if testing.Short() {
		return
	}

	if *ngo < 1 {
		*ngo = 1 // make sure test is run
	}
	if *verbose {

		}
		if info.IsDir() {
			scanDir(arg)
		} else {
			scanFile(arg, info, true)
		}
	}
}

// scanDir scans a directory for binary to run scanFile on.
func scanDir(dir string) {
	filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
		if d.Type().IsRegular() || d.Type()&fs.ModeSymlink != 0 {
			info, err := d.Info()
			if err != nil {
				if *versionV {

		}
		a.Comment = []byte(fmt.Sprintf("module %s\n\n", title))
		a.Files = []txtar.File{
			{Name: ".mod", Data: mod},
			{Name: ".info", Data: info},
		}
		dir = filepath.Clean(dir)
		err = filepath.WalkDir(dir, func(path string, info fs.DirEntry, err error) error {
			if !info.Type().IsRegular() {
				return nil
			}
			name := info.Name()
			if name == "go.mod" || strings.HasSuffix(name, ".go") {

	if err := d.calcError(); err != nil {
		return err
	}
	return d.disk.DeleteVol(ctx, volume, forceDelete)
}

func (d *naughtyDisk) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writer) error {
	if err := d.calcError(); err != nil {
		return err
	}
	return d.disk.WalkDir(ctx, opts, wr)
}

func (d *naughtyDisk) ListDir(ctx context.Context, origvolume, volume, dirPath string, count int) (entries []string, err error) {

	}
	return renderChart(h.namespace, values, h.chart, filter, h.version)
}

func GetFilesRecursive(f fs.FS, root string) ([]string, error) {
	res := []string{}
	err := fs.WalkDir(f, root, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() {
			return nil
		}
		res = append(res, path)
		return nil
	})
	return res, err
}

func TestNoUnicodeStrings(t *testing.T) {
	if !testenv.HasSrc() {
		t.Skip("source code not available")
	}

	re := regexp.MustCompile(`(strings|bytes).([A-Za-z]+)`)
	if err := fs.WalkDir(os.DirFS("."), ".", func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			t.Fatal(err)
		}

		if path == "internal/ascii" {
			return fs.SkipDir
		}

// to ErrInvalid is returned on symlink.
//
// Copying stops at and returns the first error encountered.
func CopyFS(dir string, fsys fs.FS) error {
	return fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}

		fpath, err := filepathlite.Localize(path)
		if err != nil {
			return err
		}

// The archive can be amended afterward using methods like Add and Filter.
func NewArchive(dir string) (*Archive, error) {
	a := new(Archive)
	err := fs.WalkDir(os.DirFS(dir), ".", func(name string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() {
			return nil
		}
		info, err := d.Info()
		if err != nil {
			return err
		}