@Contract("null -> null")
  @Nullable
  public static PsiExpression skipParenthesizedExprDown(@Nullable PsiExpression expression) {
    while (expression instanceof PsiParenthesizedExpression) {
      expression = ((PsiParenthesizedExpression)expression).getExpression();
    }
    return expression;
  }
@Contract("null -> null")
  @Nullable
  public static PsiExpression skipParenthesizedExprDown(@Nullable PsiExpression expression)