contract_compar
avl_create(&result->ct_type_avl, contract_compar, sizeof (contract_t),
avl_create(&contract_avl, contract_compar, sizeof (contract_t),
avl_create(&p0.p_ct_held, contract_compar, sizeof (contract_t),
avl_create(&cp->p_ct_held, contract_compar, sizeof (contract_t),
int contract_compar(const void *, const void *);