#include <stdio.h>
#include <stdarg.h>

union meh {
	void	*x;
	int	y;
};

void
a(int cmd, ...)
{
	va_list ap;
	union meh meh;
	union meh *meh_ptr;

	va_start(ap, cmd);
	meh = va_arg(ap, union meh);
	fprintf(stderr, "%d, %d\n", cmd, meh.y);
	va_end(ap);
}

int
main(void)
{
	union meh meh;

	meh.y = 42;
	a(1, meh);

	return (0);
}