Aav_node
Sym *fs = ((Aav_node *)first)->aav_ass->ass_sdp->sd_sym;
Sym *ss = ((Aav_node *)second)->aav_ass->ass_sdp->sd_sym;
avl_create(&ass_avl, &aav_compare, sizeof (Aav_node),
SGSOFFSETOF(Aav_node, aav_avl));
Aav_node *av = libld_calloc(1, sizeof (Aav_node));
Aav_node *dup;