private static PsiCaseLabelElement skipParenthesizedElementDown(@Nullable PsiCaseLabelElement element) {
    if (element instanceof PsiExpression) {
      return PsiUtil.skipParenthesizedExprDown((PsiExpression)element);
    }
    return element;
  }
private static PsiCaseLabelElement skipParenthesizedElementDown(@Nullable PsiCaseLabelElement element)