func RootPath() string {
	_, file, _, ok := runtime.Caller(0)
	if !ok {
		return "?"
	}
	return filepath.Dir(filepath.Dir(file))
}
func RootPath() string {
	_, file, _, ok := runtime.Caller(0)
	if !ok {
		return "?"
	}
	return filepath.Dir(filepath.Dir(file))
}
// RootPath returns a path of the root package.