typedef struct num {
	char is_fixnum;
	union {
		long ivalue;
	} value;
} num;
num num_intdiv(void)
{
	num a;
	num b;
	num ret;
	if (ret.is_fixnum)
		ret.value.ivalue = a.value.ivalue / b.value.ivalue;
	return ret;
}