_, err := os.Stat(filepath.Join(filepath.Dir(path), goModFile))
	return err == nil
}

// removeLastDir removes the last directory, but leaves the file name
// unchanged. It returns the new path and the removed directory. So:
// "a/b/c/file" -> ("a/b/file", "c")
func removeLastDir(path string) (newPath, removedDir string) {
	dir, file := filepath.Split(path)

	table := map[string]struct{ newPath, removedDir string }{
		"a/b/c": {"a/c", "b"},
	}
	for slashInput, expect := range table {
		input := filepath.FromSlash(slashInput)

		gotPath, gotRemoved := removeLastDir(input)
		if e, a := filepath.FromSlash(expect.newPath), gotPath; e != a {
			t.Errorf("%v: wanted %v, got %v", input, e, a)
		}
		if e, a := filepath.FromSlash(expect.removedDir), gotRemoved; e != a {