X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/ab5796a9f97180707734a81320e3eb81937281fe..622a113efd0c2b19ae75e017c6db1d08c51fef1d:/lisp/emacs-lisp/backquote.el

diff --git a/lisp/emacs-lisp/backquote.el b/lisp/emacs-lisp/backquote.el
index 81e1a91f76..c9f2a052b0 100644
--- a/lisp/emacs-lisp/backquote.el
+++ b/lisp/emacs-lisp/backquote.el
@@ -1,6 +1,7 @@
 ;;; backquote.el --- implement the ` Lisp construct
 
-;;; Copyright (C) 1990, 1992, 1994, 2001 Free Software Foundation, Inc.
+;; Copyright (C) 1990, 1992, 1994, 2001, 2002, 2003, 2004,
+;;   2005, 2006 Free Software Foundation, Inc.
 
 ;; Author: Rick Sladkey <jrs@world.std.com>
 ;; Maintainer: FSF
@@ -20,8 +21,8 @@
 
 ;; You should have received a copy of the GNU General Public License
 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Commentary:
 
@@ -44,6 +45,9 @@
   "Like `list' but the last argument is the tail of the new list.
 
 For example (backquote-list* 'a 'b 'c) => (a b . c)"
+  ;; The recursive solution is much nicer:
+  ;; (if list (cons first (apply 'backquote-list*-function list)) first))
+  ;; but Emacs is not very good at efficiently processing recursion.
   (if list
       (let* ((rest list) (newlist (cons first nil)) (last newlist))
 	(while (cdr rest)
@@ -58,7 +62,10 @@ For example (backquote-list* 'a 'b 'c) => (a b . c)"
   "Like `list' but the last argument is the tail of the new list.
 
 For example (backquote-list* 'a 'b 'c) => (a b . c)"
-  (setq list (reverse (cons first list))
+  ;; The recursive solution is much nicer:
+  ;; (if list (list 'cons first (cons 'backquote-list*-macro list)) first))
+  ;; but Emacs is not very good at efficiently processing such things.
+  (setq list (nreverse (cons first list))
 	first (car list)
 	list (cdr list))
   (if list