__associativity_to_nid
return __associativity_to_nid((associativity + 1), array_sz);
nid = __associativity_to_nid(associativity, max_array_sz);
nid = __associativity_to_nid(associativity, aa.array_sz);
nid = __associativity_to_nid(associativity, aa.array_sz);