}

	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
	})
	if err != nil {

func matchMetadata(dir string, info fs.DirEntry) bool {
	name := info.Name()
	for _, p := range metaPrefixes {
		if strings.HasPrefix(name, p) {
			return true
		}
	}
	return false
}

// matchPotentialSourceFile reports whether info may be relevant to a build operation.
func matchPotentialSourceFile(dir string, info fs.DirEntry) bool {
	if strings.HasSuffix(info.Name(), "_test.go") {

	uid     types.UID
	netns   fs.File
	netnsfd uintptr
	inode   uint64
}

func (p *PodNetnsProcFinder) processEntry(proc fs.FS, netnsObserved sets.Set[uint64], filter sets.Set[types.UID], entry fs.DirEntry) (*PodNetnsEntry, error) {
	if !isProcess(entry) {
		return nil, nil
	}

	netnsName := path.Join(entry.Name(), "ns", "net")
	fi, err := fs.Stat(proc, netnsName)
	if err != nil {
		return nil, err
	}

}

func (d *dirInfo) close() {
	if d.dir == 0 {
		return
	}
	closedir(d.dir)
	d.dir = 0
}

func (f *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
	// If this file has no dirinfo, create one.
	var d *dirInfo
	for {
		d = f.dirinfo.Load()
		if d != nil {
			break
		}
		dir, call, errno := f.pfd.OpenDir()

// ReadDir returns no directory entries along with the error.
//
// Deprecated: As of Go 1.16, [os.ReadDir] is a more efficient and correct choice:
// it returns a list of [fs.DirEntry] instead of [fs.FileInfo],
// and it returns partial results in the case of an error
// midway through reading a directory.
//
// If you must continue obtaining a list of [fs.FileInfo], you still can:
//

		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") {
				data, err := os.ReadFile(path)
				if err != nil {

		testFile(t, b1, b2, filename)
	}
	done <- 0
}

func genFilenames(t *testing.T, filenames chan<- string) {
	defer close(filenames)

	handleFile := func(filename string, d fs.DirEntry, err error) error {
		if err != nil {
			t.Error(err)
			return nil
		}
		// don't descend into testdata directories
		if isGoFile(d) && !strings.Contains(filepath.ToSlash(filename), "/testdata/") {

	full, err := f.fullName("open", name)
	if err != nil {
		return nil, err
	}
	file, err := f.fsys.Open(full)
	return file, f.fixErr(err)
}

func (f *subFS) ReadDir(name string) ([]DirEntry, error) {
	full, err := f.fullName("read", name)
	if err != nil {
		return nil, err
	}
	dir, err := ReadDir(f.fsys, full)
	return dir, f.fixErr(err)
}

func (f *subFS) ReadFile(name string) ([]byte, error) {

		return &buf
	},
}

func (d *dirInfo) close() {
	if d.buf != nil {
		dirBufPool.Put(d.buf)
		d.buf = nil
	}
}

func (f *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
	// If this file has no dirInfo, create one.
	d := f.dirinfo.Load()
	if d == nil {
		d = new(dirInfo)
		f.dirinfo.Store(d)
	}
	d.mu.Lock()
	defer d.mu.Unlock()

	file, err := os.CreateTemp(fs.prefix(dir), prefix)
	if err != nil {
		return nil, err
	}
	return &defaultFile{file}, nil
}

// ReadDir via os.ReadDir
func (fs *DefaultFs) ReadDir(dirname string) ([]os.DirEntry, error) {
	return os.ReadDir(fs.prefix(dirname))
}

// Walk via filepath.Walk
func (fs *DefaultFs) Walk(root string, walkFn filepath.WalkFunc) error {
	return filepath.Walk(fs.prefix(root), walkFn)
}