42 #define left(v)		(v)->narg[0]  macro
192 		penter(left(p));  in penter()
193 		parent(left(p)) = p;  in penter()
197 		penter(left(p));  in penter()
199 		parent(left(p)) = p;  in penter()
216 		freetr(left(p));  in freetr()
221 		freetr(left(p));  in freetr()
369 		cfoll(f,left(v));  in cfoll()
373 		cfoll(f,left(v));  in cfoll()
409 		if (first(left(p)) == 0) return(0);  in first()
413 		first(left(p));  in first()
416 		if (first(left(p)) == 0 && first(right(p)) == 0) return(0);  in first()
420 		if (first(left(p)) == 0 || b == 0) return(0);  in first()
447 		if (v == left(p)) {	/* v is left child of p */  in follow()