return roots, nil
	}

	return nil, firstErr
}

// readUniqueDirectoryEntries is like os.ReadDir but omits
// symlinks that point within the directory.
func readUniqueDirectoryEntries(dir string) ([]fs.DirEntry, error) {
	files, err := os.ReadDir(dir)
	if err != nil {
		return nil, err
	}
	uniq := files[:0]
	for _, f := range files {
		if !isSameDirSymlink(f, dir) {
			uniq = append(uniq, f)
		}
	}

	}

	return string(b)
}

// FormatDirEntry returns a formatted version of dir for human readability.
// Implementations of [DirEntry] can call this from a String method.
// The outputs for a directory named subdir and a file named hello.go are:
//
//	d subdir/
//	- hello.go
func FormatDirEntry(dir DirEntry) string {
	name := dir.Name()
	b := make([]byte, 0, 5+len(name))

	// The Type method does not return any permission bits,

limitations under the License.
*/

// Code generated by MockGen.
// Source: os (interfaces: DirEntry)

package testing

import (
	fs "io/fs"
	reflect "reflect"

	gomock "go.uber.org/mock/gomock"
)

// MockDirEntry is a mock of DirEntry interface.
type MockDirEntry struct {
	ctrl     *gomock.Controller
	recorder *MockDirEntryMockRecorder
}

	return 0, &fs.PathError{Op: "read", Path: d.path, Err: fs.ErrInvalid}
}

func (d *mapDir) ReadDir(count int) ([]fs.DirEntry, error) {
	n := len(d.entry) - d.offset
	if n == 0 && count > 0 {
		return nil, io.EOF
	}
	if count > 0 && n > count {
		n = count
	}
	list := make([]fs.DirEntry, n)
	for i := range list {
		list[i] = &d.entry[d.offset+i]
	}
	d.offset += n
	return list, nil

)

// A file is a single file in the FS.
// It implements fs.FileInfo and fs.DirEntry.
type file struct {
	// The compiler knows the layout of this struct.
	// See cmd/compile/internal/staticdata's WriteEmbed.
	name string
	data string
	hash [16]byte // truncated SHA256 hash
}

var (
	_ fs.FileInfo = (*file)(nil)
	_ fs.DirEntry = (*file)(nil)
)

	f, err := MapFS(fsys).Open(name)
	if err != nil {
		return nil, err
	}
	return &shuffledFile{File: f}, nil
}

type shuffledFile struct{ fs.File }

func (f *shuffledFile) ReadDir(n int) ([]fs.DirEntry, error) {
	dirents, err := f.File.(fs.ReadDirFile).ReadDir(n)
	// Shuffle in a deterministic way, all we care about is making sure that the
	// list of directory entries is not is the lexicographic order.
	//

}

// pathVersion returns the Go version implemented by the file
// described by de and info in directory dir.
// The analysis only uses the name itself; it does not run the program.
func pathVersion(dir string, de fs.DirEntry, info fs.FileInfo) (string, bool) {
	return "", false

}

// pathVersion returns the Go version implemented by the file
// described by de and info in directory dir.
// The analysis only uses the name itself; it does not run the program.
func pathVersion(dir string, de fs.DirEntry, info fs.FileInfo) (string, bool) {
	v := gover.FromToolchain(de.Name())
	if v == "" || info.Mode()&0111 == 0 {
		return "", false
	}
	return v, true

// The order of the lists need not match.
func (t *fsTester) checkDirList(dir, desc string, list1, list2 []fs.DirEntry) {
	old := make(map[string]fs.DirEntry)
	checkMode := func(entry fs.DirEntry) {
		if entry.IsDir() != (entry.Type()&fs.ModeDir != 0) {
			if entry.IsDir() {
				t.errorf("%s: ReadDir returned %s with IsDir() = true, Type() & ModeDir = 0", dir, entry.Name())

// If a member of the form `*Fn` is set, that function will be called in place
// of the real call.
type FakeOS struct {
	StatFn     func(string) (os.FileInfo, error)
	ReadDirFn  func(string) ([]os.DirEntry, error)
	MkdirAllFn func(string, os.FileMode) error
	SymlinkFn  func(string, string) error
	GlobFn     func(string, string) bool
	HostName   string
	Removes    []string
	Files      map[string][]*os.FileInfo