;;; GNU Mes --- Maxwell Equations of Software
;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Mes.
;;;
;;; GNU Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.

(define (foo x pair?)
  (core:display "foo x=") (core:display x) (core:display "\n")
  (core:display "    pair?=") (core:display pair?) (core:display "\n")
  (if pair? ((lambda (a d)
               (cons a d))
             (begin
               (core:display "BEFORE x=") (core:display x) (core:display "\n")
               (foo (car x) #f))
             (begin
               (core:display "EFTER x=") (core:display x) (core:display "\n")
               (foo (cdr x) #f)))
      x))

(if (null? (cdr (foo '(42) #t))) (exit 0))
(exit 1)