alloc_xmalloc
void *alloc_xmalloc(size_t size);
ret = alloc_xmalloc(size);
ret = alloc_xmalloc(sizeof (*ret));
arrowp = alloc_xmalloc(
newb = alloc_xmalloc(sizeof (struct bubble));
newal = alloc_xmalloc(sizeof (struct arrowlist));
newa = alloc_xmalloc(sizeof (struct arrow));
newc = alloc_xmalloc(sizeof (struct constraintlist));
ret = alloc_xmalloc(sizeof (*ret));
iterinfop = alloc_xmalloc(
struct iterinfo *ret = alloc_xmalloc(sizeof (*ret));