defer remove()

	path := filepath.Join(dir, "lock")

	mu := lockedfile.MutexAt(path)
	t.Logf("mu := MutexAt(_)")

	unlock, err := mu.Lock()
	if err != nil {
		t.Fatalf("mu.Lock: %v", err)
	}
	t.Logf("unlock, _  := mu.Lock()")

	mu2 := lockedfile.MutexAt(mu.Path)
	t.Logf("mu2 := MutexAt(mu.Path)")

	wait := mustBlock(t, "mu2.Lock()", func() {
		unlock2, err := mu2.Lock()
		if err != nil {

}

// MutexAt returns a new Mutex with Path set to the given non-empty path.
func MutexAt(path string) *Mutex {
	if path == "" {
		panic("lockedfile.MutexAt: path must be non-empty")
	}
	return &Mutex{Path: path}
}

func (mu *Mutex) String() string {

	path, err := CachePath(ctx, mod, "lock")
	if err != nil {
		return nil, err
	}
	if err := os.MkdirAll(filepath.Dir(path), 0777); err != nil {
		return nil, err
	}
	return lockedfile.MutexAt(path).Lock()
}

// SideLock locks a file within the module cache that previously guarded
// edits to files outside the cache, such as go.sum and go.mod files in the
// user's working directory.

		return "", "", err
	}

	lockfile = dir + ".lock"
	if buildX {
		fmt.Fprintf(xLog, "# lock %s\n", lockfile)
	}

	unlock, err := lockedfile.MutexAt(lockfile).Lock()
	if err != nil {
		return "", "", fmt.Errorf("codehost.WorkDir: can't find or create lock file: %v", err)
	}
	defer unlock()

	data, err := os.ReadFile(dir + ".info")

	pathExts.once.Do(initPathExts)
	name, _, ok := cutExt(de.Name(), pathExts.list)
	if !ok {
		return "", false
	}
	v := gover.FromToolchain(name)
	if v == "" {
		return "", false
	}
	return v, true
}

// cutExt looks for any of the known extensions at the end of file.
// If one is found, cutExt returns the file name with the extension trimmed,

    }

    /**
     * @param extension
     * @return
     */
    private String getOutputExtension(final String extension) {
        final String outExt = extensionMap.get(extension);
        return outExt == null ? "txt" : outExt;
    }

    private String getFileName(final String resourceName) {
        final String name = resourceName.replaceAll("/+$", "");
        final int pos = name.lastIndexOf('/');