;; Giving empty :PRINT-OBJECT or :PRINT-FUNCTION options
;; leaves PO or PF equal to NIL. The user-level effect is
;; to generate a PRINT-OBJECT method specialized for the type,
;; Giving empty :PRINT-OBJECT or :PRINT-FUNCTION options
;; leaves PO or PF equal to NIL. The user-level effect is
;; to generate a PRINT-OBJECT method specialized for the type,