--- /dev/null
+;;;; List functions not provided in R5RS or srfi-1
+
+;;; Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+;;;
+;; This library is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU Lesser General Public
+;; License as published by the Free Software Foundation; either
+;; version 2.1 of the License, or (at your option) any later version.
+;;
+;; This library 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
+;; Lesser General Public License for more details.
+;;
+;; You should have received a copy of the GNU Lesser General Public
+;; License along with this library; if not, write to the Free Software
+;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+(define-module (ice-9 list)
+ :export (rassoc rassv rassq))
+
+(define (generic-rassoc key alist =)
+ (let loop ((ls alist))
+ (and (not (null? ls))
+ (if (= key (cdar ls))
+ (car ls)
+ (loop (cdr ls))))))
+
+(define (rassoc key alist . =)
+ (generic-rassoc key alist (if (null? =) equal? (car =))))
+
+(define (rassv key alist)
+ (generic-rassoc key alist eqv?))
+
+(define (rassq key alist)
+ (generic-rassoc key alist eq?))