_ = flags.MarkHidden("referential")
	return c
}

func warningToString(w validation.Warning) string {
	we, ok := w.(*multierror.Error)
	if ok {
		we.ErrorFormat = func(i []error) string {
			points := make([]string, len(i))
			for i, err := range i {
				points[i] = fmt.Sprintf("* %s", err)
			}

			return fmt.Sprintf(
				"\n\t%s\n",