private static boolean isNullable(@NotNull PsiExpression argument) {
      final Nullability nullability = NullabilityUtil.getExpressionNullability(argument, true);
      if (nullability == Nullability.NULLABLE) return true;
      if (argument instanceof PsiReferenceExpression referenceExpression) {
        final PsiElement target = referenceExpression.resolve();
        if (target instanceof PsiModifierListOwner) {
          if (NullableNotNullManager.isNullable((PsiModifierListOwner)target)) {
            return true;
          }
        }
      }
      return false;
    }
private static boolean isNullable(@NotNull PsiExpression argument)