list? for circular lists
list? for circular lists

pic_list_p() detects circular lists using Floyd's cycle-finding algorithm.

koba-e964/picrin,leavesbnw/picrin,omasanori/picrin,dcurrie/picrin,ktakashi/picrin,picrin-scheme/picrin,leavesbnw/picrin,ktakashi/picrin,ktakashi/picrin,leavesbnw/picrin,dcurrie/picrin,koba-e964/picrin,omasanori/picrin,picrin-scheme/picrin,koba-e964/picrin