230 	Avl	*node;  member
339 		if(w->node == a){  in walkdel()
342 			w->node = p;  in walkdel()
379 		w->node = a;  in avlnext()
382 		a = findsuccessor(w->node);  in avlnext()
383 		if(a == w->node)  in avlnext()
385 		w->node = a;  in avlnext()
387 	return w->node;  in avlnext()
398 		w->node = a;  in avlprev()
402 		return w->node;  in avlprev()
404 		a = findpredecessor(w->node);  in avlprev()
405 		if(a == w->node)  in avlprev()
407 		w->node = a;  in avlprev()
409 	return w->node;  in avlprev()