@Contract("null -> false")
  public static boolean isNullLiteral(@Nullable PsiExpression expression) {
    expression = PsiUtil.deparenthesizeExpression(expression);
    return expression instanceof PsiLiteralExpression && ((PsiLiteralExpression)expression).getValue() == null;
  }
@Contract("null -> false")
  public static boolean isNullLiteral(@Nullable PsiExpression expression)