From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: Are two symbols `equal' iff they are `eq'? Date: Sun, 09 Aug 2015 16:03:43 +0200 Message-ID: <877fp4tv7k.fsf@web.de> References: <878u9k7vru.fsf@mbork.pl> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1439129062 11508 80.91.229.3 (9 Aug 2015 14:04:22 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 9 Aug 2015 14:04:22 +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 09 16:04:13 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 1ZORCu-00019j-1J for geh-help-gnu-emacs@m.gmane.org; Sun, 09 Aug 2015 16:04:12 +0200 Original-Received: from localhost ([::1]:55366 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZORCt-0005Mp-CM for geh-help-gnu-emacs@m.gmane.org; Sun, 09 Aug 2015 10:04:11 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:32779) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZORCe-0005Jl-LJ for help-gnu-emacs@gnu.org; Sun, 09 Aug 2015 10:03:57 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZORCa-0005ym-GP for help-gnu-emacs@gnu.org; Sun, 09 Aug 2015 10:03:56 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:47657) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZORCa-0005y6-9l for help-gnu-emacs@gnu.org; Sun, 09 Aug 2015 10:03:52 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1ZORCY-0000qt-O6 for help-gnu-emacs@gnu.org; Sun, 09 Aug 2015 16:03:50 +0200 Original-Received: from ip-90-186-46-73.web.vodafone.de ([90.186.46.73]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 09 Aug 2015 16:03:50 +0200 Original-Received: from michael_heerdegen by ip-90-186-46-73.web.vodafone.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 09 Aug 2015 16:03:50 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 18 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: ip-90-186-46-73.web.vodafone.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:gYK37C5WHIFdHIsrx+axiHTJKzA= 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:106393 Archived-At: Marcin Borkowski writes: > I cannot make two symbols which would be `equal' but not `eq'. Unlike what your subject says, you seem to want to know Are two symbols `eq' iff they are `equal'? Which is the more interesting question. > (defun eq (a b) (message "Haha!)) > (equal 'a 'a) This is not a good test when the call to `eq' is done from C. So, a negative result doesn't mean anything. Michael.