The SWIG keyword is $self but this code uses an undecorated self

/*
 * modify: the size of the array was put into the first element by the
 * typemap.
 */
int _modify(WT_MODIFY *list) {
	int count = (int)list[0].size;
	return (self->modify(self, &list[1], count));
}

It's unclear to me as to why this silently works, perhaps the code is unused/evaluated?

1. Identify why there is no error.
2. Determine whether code should be fixed or removed.