cons_marked_p    6612 src/alloc.c      for (tail = list; CONSP (tail) && !cons_marked_p (XCONS (tail));
cons_marked_p    7014 src/alloc.c    	    if (cons_marked_p (ptr))
cons_marked_p    7123 src/alloc.c          survives_p = cons_marked_p (XCONS (obj));