/usr/share/acl2-4.3/books/unicode/string-append.lisp is in acl2-books-source 4.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | ;; Processing Unicode Files with ACL2
;; Copyright (C) 2005-2006 by Jared Davis <jared@cs.utexas.edu>
;;
;; This program 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 2 of the License, or (at your option)
;; any later version.
;;
;; This program 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
;; this program; if not, write to the Free Software Foundation, Inc., 59 Temple
;; Place - Suite 330, Boston, MA 02111-1307, USA.
(in-package "ACL2")
(local (include-book "append"))
(local (include-book "coerce"))
(defthm equal-of-string-appends-one
(implies (and (stringp x)
(stringp y1)
(stringp y2))
(equal (equal (string-append x y1)
(string-append x y2))
(equal y1 y2))))
(defthm equal-of-string-appends-two
(implies (and (stringp x1)
(stringp x2)
(stringp y))
(equal (equal (string-append x1 y)
(string-append x2 y))
(equal x1 x2))))
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