panicz

(define old-lisp-program "
DEFINE ((
(THEOREM (LAMBDA (S) (TH1 NIL NIL (CADR S) (CADDR S))))

(TH1 (LAMBDA (A1 A2 A C) (COND ((NULL A)
        (TH2 A1 A2 NIL NIL C)) (T
        (OR (MEMBER (CAR A) C) (COND ((ATOM (CAR A))
        (TH1 (COND ((MEMBER (CAR A) A1) A1)
        (T (CONS (CAR A) A1))) A2 (CDR A) C))
        (T (TH1 A1 (COND ((MEMBER (CAR A) A2) A2)

panicz

(use-modules (grand scheme))

(define (all-the-same? xs)
  (match xs
    [(x x) #t]
    [(x x . xs*) (all-the-same? `(,x . ,xs*))]
    [_ #f]))

(e.g. (all-the-same? '(1 1 1)))
(e.g. (not (all-the-same? '(1 1 2))))

panicz

(define (passing-arguments arguments names final)
  (assert (= (length arguments) (length names)))
  (match arguments
    (()
     (assert (null? names))
     final)
    ((argument . next)
     (let (((name . names) names))
       (if (compound? argument)
           (passing-arguments next names

panicz

(use-modules (grand scheme)) ;; https://github.com/plande/grand-scheme

(define ((in? l) x)
  (match l
    ((h . t)
     (or (eq? x h)
         ((in? t) x)))
    (_
     #f)))