From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Pascal J. Bourguignon" Newsgroups: gmane.emacs.help Subject: Re: Why doesn't nconc change my variable? Date: Sun, 05 Oct 2014 20:14:22 +0200 Organization: Informatimago Message-ID: <87bnpqmlj5.fsf@kuiper.lan.informatimago.com> References: <87y4svl2ku.fsf@wmi.amu.edu.pl> <3867d7c2-936d-4441-91d6-3b12dc959391@default> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1412533263 9069 80.91.229.3 (5 Oct 2014 18:21:03 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 5 Oct 2014 18:21:03 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Oct 05 20:20:58 2014 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XaqQR-0002Th-GM for geh-help-gnu-emacs@m.gmane.org; Sun, 05 Oct 2014 20:20:55 +0200 Original-Received: from localhost ([::1]:48304 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XaqQR-0003qr-1q for geh-help-gnu-emacs@m.gmane.org; Sun, 05 Oct 2014 14:20:55 -0400 Original-Path: usenet.stanford.edu!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 26 Original-X-Trace: individual.net sCnfcnzpl4347SoenN+ozQdKOJFtaWu2DJx1WSncV3WQu/o9ec Cancel-Lock: sha1:Y2I3NTZhODU5Mjk3ZmQ5NmNlNDYzNzEyZjI2ZTA5YTg5MWJjMmQwOQ== sha1:A8hcPmfvUIUNRmH7O5D8e27gzWs= Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) Original-Xref: usenet.stanford.edu gnu.emacs.help:208016 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:100292 Archived-At: Marcin Borkowski writes: > Does it mean that Pascal's earlier response was right? Now that I'm > thinking about it, this makes sense: an empty list is (I would guess) a > NUL pointer, NO! There is no pointer in lisp! An empty list is the symbol nil! (symbolp (list)) --> t (consp (list)) --> nil (symbol-name (list)) --> "nil" (symbolp (list 1)) --> nil (consp (list 1)) --> t (car (list 1)) --> 1 (cdr (list 1)) --> nil -- __Pascal Bourguignon__ http://www.informatimago.com/ “The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment.” -- Carl Bass CEO Autodesk