circular_list    2236 src/fns.c      	    circular_list (seq);
circular_list    3975 src/lisp.h     extern AVOID circular_list (Lisp_Object);
circular_list    5583 src/lisp.h       FOR_EACH_TAIL_INTERNAL (tail, circular_list (tail), true)
circular_list    2008 src/xfaces.c   	    circular_list (orig_face);