From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Politz Newsgroups: gmane.emacs.help Subject: Re: Redefining functions and variables Date: Wed, 28 Jul 2010 20:48:40 +0200 Organization: FH-Trier Message-ID: <87tynjl9x3.fsf@fh-trier.de> References: <68e690c9-aece-461d-afe9-ca9115ceaee5@m1g2000vbh.googlegroups.com> <76fd4dc4-a964-4629-90e2-329e1b83fd8d@h25g2000vba.googlegroups.com> <876300fnpk.fsf@fh-trier.de> <55e481e3-b894-499f-80b3-1c96b2c338ce@d37g2000yqm.googlegroups.com> <61db17c1-8c30-44a1-b96e-9eec802156fe@j8g2000yqd.googlegroups.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: dough.gmane.org 1291859147 8440 80.91.229.12 (9 Dec 2010 01:45:47 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 9 Dec 2010 01:45:47 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Dec 09 02:45:42 2010 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1PQVZm-0002cE-6M for geh-help-gnu-emacs@m.gmane.org; Thu, 09 Dec 2010 02:45:42 +0100 Original-Received: from localhost ([127.0.0.1]:47992 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PQVZl-0003Mz-NA for geh-help-gnu-emacs@m.gmane.org; Wed, 08 Dec 2010 20:45:41 -0500 Original-Path: usenet.stanford.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!kanaga.switch.ch!switch.ch!news.belwue.de!news.uni-kl.de!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 28 Original-NNTP-Posting-Host: 143-93-54-11.arno.fh-trier.de Original-X-Trace: news.uni-kl.de 1280342921 10316 143.93.54.11 (28 Jul 2010 18:48:41 GMT) Original-X-Complaints-To: usenet@news.uni-kl.de Original-NNTP-Posting-Date: Wed, 28 Jul 2010 18:48:41 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) Cancel-Lock: sha1:8kwFBanvER2AFOXtanSq/6UZNOw= Cache-Post-Path: arno.fh-trier.de!unknown@dslb-084-059-099-150.pools.arcor-ip.net X-Cache: nntpcache 3.0.1 (see http://www.nntpcache.org/) Original-Xref: usenet.stanford.edu gnu.emacs.help:180157 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:76409 Archived-At: Elena writes: > On Jul 28, 7:51 am, Elena wrote: >> > Of course this leads to an endless recursive loop, expanding your macro >> > again and again ... >> >> Then I should have tested the macro with `macroexpand-all' instead of >> `macroexpand'. However, I've tried using the macro, and it seemed to >> work, albeit it choked on the unquoted symbol passed to `fboundp'. > > I think it seemed to work because the macro was interpreted, therefore > it was expanded only once before the failure. Don't know, but defining `defun' as a macro usually deletes the original subst (which is a special form, which is kind of like a macro). (defvar defun-subst (symbol-function 'defun)) (defmacro defun (name args &rest body) `(defun ,name ,args ,@body)) (defun foo ()) ;; Enters the debugger because of recursion limit reached. ;; Restore original defun (fset 'defun defun-subst) -ap