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+;;; lists.scm --- The R6RS list utilities library
+
+;; Copyright (C) 2010 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 3 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
+
+
+(library (rnrs lists (6))
+ (export find for-all exists filter partition fold-left fold-right remp remove
+ remv remq memp member memv memq assp assoc assv assq cons*)
+ (import (rnrs base (6))
+ (only (guile) filter member memv memq assoc assv assq cons*)
+ (rename (only (srfi srfi-1) any
+ every
+ remove
+ member
+ assoc
+ find
+ partition
+ fold-right
+ filter-map)
+ (any exists)
+ (every for-all)
+ (remove remp)
+
+ (member memp-internal)
+ (assoc assp-internal)))
+
+ (define (fold-left combine nil list . lists)
+ (define (fold nil lists)
+ (if (exists null? lists)
+ nil
+ (fold (apply combine nil (map car lists))
+ (map cdr lists))))
+ (fold nil (cons list lists)))
+
+ (define (remove obj list) (remp (lambda (elt) (equal? obj elt)) list))
+ (define (remv obj list) (remp (lambda (elt) (eqv? obj elt)) list))
+ (define (remq obj list) (remp (lambda (elt) (eq? obj elt)) list))
+
+ (define (memp pred list) (memp-internal #f list (lambda (x y) (pred y))))
+ (define (assp pred list) (assp-internal #f list (lambda (x y) (pred y))))
+)