
(/VERSIONCHECK 2) 

(DEFPARAMETER |RetractableTo;CAT| 'NIL) 

(DEFPARAMETER |RetractableTo;AL| 'NIL) 

(DEFUN |RetractableTo| (#1=#:G2276)
  (LET (#2=#:G2277)
    (COND
     ((SETQ #2# (|assoc| #3=(|devaluate| #1#) |RetractableTo;AL|)) (CDR #2#))
     (T
      (SETQ |RetractableTo;AL|
              (|cons5| (CONS #3# (SETQ #2# (|RetractableTo;| #1#)))
                       |RetractableTo;AL|))
      #2#)))) 

(DEFUN |RetractableTo;| (|t#1|)
  (PROG (#1=#:G2275)
    (RETURN
     (PROG1
         (LETT #1#
               (|sublisV| (PAIR '(|t#1|) (LIST (|devaluate| |t#1|)))
                          (COND (|RetractableTo;CAT|)
                                ('T
                                 (LETT |RetractableTo;CAT|
                                       (|Join|
                                        (|mkCategory| '|domain|
                                                      '(((|coerce| ($ |t#1|))
                                                         T)
                                                        ((|retractIfCan|
                                                          ((|Union| |t#1|
                                                                    "failed")
                                                           $))
                                                         T)
                                                        ((|retract| (|t#1| $))
                                                         T))
                                                      NIL 'NIL NIL))
                                       . #2=(|RetractableTo|)))))
               . #2#)
       (SETELT #1# 0 (LIST '|RetractableTo| (|devaluate| |t#1|))))))) 
