t.Parallel()

	t.Run(".", testReaddirnames(".", dot))
	t.Run("sysdir", testReaddirnames(sysdir.name, sysdir.files))
	t.Run("TempDir", testReaddirnames(t.TempDir(), nil))
}

func TestFileReaddir(t *testing.T) {
	t.Parallel()

	t.Run(".", testReaddir(".", dot))
	t.Run("sysdir", testReaddir(sysdir.name, sysdir.files))
	t.Run("TempDir", testReaddir(t.TempDir(), nil))
}

	default: // "", "on", "auto", anything else
		// Maybe use modules.
	}

	if srcDir != "" {
		var absSrcDir string
		if filepath.IsAbs(srcDir) {
			absSrcDir = srcDir
		} else if ctxt.Dir != "" {
			return fmt.Errorf("go/build: Dir is non-empty, so relative srcDir is not allowed: %v", srcDir)
		} else {
			// Find the absolute source directory. hasSubdir does not handle

		dir := filepath.Dir(filepath.Clean(m.Pattern()[:i+3]))
		absDir := dir
		if !filepath.IsAbs(dir) {
			absDir = filepath.Join(base.Cwd(), dir)
		}

		modRoot := findModuleRoot(absDir)
		found := false
		for _, mainModuleRoot := range modRoots {
			if mainModuleRoot == modRoot {
				found = true
				break
			}
		}
		if !found && search.InDir(absDir, cfg.GOROOTsrc) == "" && pathInModuleCache(ctx, absDir, rs) == "" {

// and os.Stderr.
func (t *tester) dirCmd(dir string, cmdline ...interface{}) *exec.Cmd {
	bin, args := flattenCmdline(cmdline)
	cmd := exec.Command(bin, args...)
	if filepath.IsAbs(dir) {
		setDir(cmd, dir)
	} else {
		setDir(cmd, filepath.Join(goroot, dir))
	}
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if vflag > 1 {
		errprintf("%s\n", strings.Join(cmd.Args, " "))
	}
	return cmd
}

	EILSEQ          = Errno(0x58)
	EINPROGRESS     = Errno(0x96)
	EINTR           = Errno(0x4)
	EINVAL          = Errno(0x16)
	EIO             = Errno(0x5)
	EISCONN         = Errno(0x85)
	EISDIR          = Errno(0x15)
	EL2HLT          = Errno(0x2c)
	EL2NSYNC        = Errno(0x26)
	EL3HLT          = Errno(0x27)
	EL3RST          = Errno(0x28)
	ELIBACC         = Errno(0x53)
	ELIBBAD         = Errno(0x54)

		"pkg/include",
	)
	for _, copydir := range dirs {
		srcdir := filepath.Join(testGOROOT, copydir)
		tg.tempDir(filepath.Join("goroot", copydir))
		err := filepath.WalkDir(srcdir,
			func(path string, info fs.DirEntry, err error) error {
				if err != nil {
					return err
				}
				if info.IsDir() {
					return nil
				}
				srcrel, err := filepath.Rel(srcdir, path)
				if err != nil {
					return err
				}

github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 h1:kdXcSzyDtseVEc4yCz2qF8ZrQvIDBJLl4S1c3GCXmoI=
github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635/go.mod h1:hkRG7XYTFWNJGYcbNJQlaLq0fg1yr4J4t/NcTQtrfww=

		return nil, time.Time{}, err
	}
	defer f.Close()
	stat, err := f.Stat()
	if err != nil {
		return nil, time.Time{}, err
	}
	if stat.IsDir() {
		return nil, time.Time{}, &os.PathError{
			Op:   "open",
			Path: itemPath,
			Err:  syscall.EISDIR,
		}
	}
	buf, err := readXLMetaNoData(f, stat.Size())
	if err != nil {
		return nil, stat.ModTime().UTC(), fmt.Errorf("%w -> %s", err, itemPath)
	}