From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Elisps rplacd vs CL's one Date: Sat, 29 Aug 2015 18:05:04 -0400 Message-ID: References: <87oahqlgpo.fsf@mbork.pl> 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 1440886231 25401 80.91.229.3 (29 Aug 2015 22:10:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 29 Aug 2015 22:10:31 +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 Aug 30 00:10:23 2015 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 1ZVoKN-0003VT-8I for geh-help-gnu-emacs@m.gmane.org; Sun, 30 Aug 2015 00:10:23 +0200 Original-Received: from localhost ([::1]:54934 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZVoKN-0000Lx-2X for geh-help-gnu-emacs@m.gmane.org; Sat, 29 Aug 2015 18:10:23 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:58269) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZVoKA-0000LF-2g for help-gnu-emacs@gnu.org; Sat, 29 Aug 2015 18:10:10 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZVoK6-0005l7-T8 for help-gnu-emacs@gnu.org; Sat, 29 Aug 2015 18:10:10 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:46846) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZVoK6-0005jc-Me for help-gnu-emacs@gnu.org; Sat, 29 Aug 2015 18:10:06 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1ZVoK3-00037X-8g for help-gnu-emacs@gnu.org; Sun, 30 Aug 2015 00:10:03 +0200 Original-Received: from 104-222-112-193.cpe.teksavvy.com ([104.222.112.193]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 30 Aug 2015 00:10:03 +0200 Original-Received: from monnier by 104-222-112-193.cpe.teksavvy.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 30 Aug 2015 00:10:03 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 12 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 104-222-112-193.cpe.teksavvy.com User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:yoHL9/0kFWVuZ8MsmyawE8zlrPY= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 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:106923 Archived-At: > Emacs Lisp's rplacd and Common Lisp's RPLACD are called the same, but > behave differently (ELisp's one returns the NEWCDR and CL's one returns > the modified cons). What is the reason for that? Is it an accident? > While I do understand that EL ≠ CL, having a function called the same in > both, doing roughly the same thing, but not quite, seems a bit > misleading, and I was just curious whether there was a deep reason for > that. FWIW, I consider the use of rplacd's return value to be a very bad idea. Stefan