iexpr
struct iexpr *bucketp = Cache[idx];
struct iexpr *cp;
struct iexpr *cp;
struct iexpr *prevcp = NULL;
struct iexpr *cp = Cache[iexpr_hash(np) % IEXPRSZ];
struct iexpr *cp;
struct iexpr *ncp;
struct iexpr *next; /* next entry in hash bucket */
struct node *iexpr(struct node *np);
(void) itree_add_constraint(ap, iexpr(newc));