From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Barry Margolin Newsgroups: gmane.emacs.help Subject: Re: How to put this in a macro Date: Sat, 17 Apr 2010 12:49:41 -0400 Organization: A noiseless patient Spider Message-ID: References: <87pr1zw164.fsf@linux-lqcw.site> <87d3xywpm6.fsf@linux-lqcw.site> <87633qwd5l.fsf@linux-lqcw.site> <871veewblx.fsf@linux-lqcw.site> <0b67cc27-1c96-459b-a8f8-435cef946281@q15g2000yqj.googlegroups.com> NNTP-Posting-Host: lo.gmane.org X-Trace: dough.gmane.org 1273009471 20232 80.91.229.12 (4 May 2010 21:44:31 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Tue, 4 May 2010 21:44:31 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue May 04 23:44:30 2010 connect(): No such file or directory 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 1O9Pum-0005KC-TX for geh-help-gnu-emacs@m.gmane.org; Tue, 04 May 2010 23:44:29 +0200 Original-Received: from localhost ([127.0.0.1]:39290 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O9Pum-0000lF-Bq for geh-help-gnu-emacs@m.gmane.org; Tue, 04 May 2010 17:44:28 -0400 Original-Path: usenet.stanford.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!newsgate.cistron.nl!newsgate.news.xs4all.nl!news2.euro.net!newsfeed.freenet.ag!feeder.erje.net!feeder.eternal-september.org!eternal-september.org!barmar.motzarella.org!.POSTED!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 25 Injection-Date: Sat, 17 Apr 2010 16:49:40 +0000 (UTC) Injection-Info: barmar.motzarella.org; posting-host="+bxBiZT/p0ZLLuDb5H+JCw"; logging-data="13560"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19cGQd0h+0eCX9YDf0rJhdb" User-Agent: MT-NewsWatcher/3.5.3b3 (Intel Mac OS X) Cancel-Lock: sha1:QJvZhiaiNYAfGBjvW/AxAlAqRxM= Original-Xref: usenet.stanford.edu gnu.emacs.help:177754 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:73200 Archived-At: In article <0b67cc27-1c96-459b-a8f8-435cef946281@q15g2000yqj.googlegroups.com>, José A. Romero L. wrote: > On 17 Kwi, 13:40, Cecil Westerhof wrote: > (...) > >            (if (> (symbol-value ,start-sym) (symbol-value ,end-sym)) > >                (let ((temp (symbol-value ,start-sym))) > >                  (set ,start-sym (symbol-value ,end-sym)) > >                  (set ,end-sym   temp))))) > > > > I also make sure now that start is not after end. > (...) > > Hmm, be careful with lets inside macros - this will work OK until one > of the variables you try to set is named precisely "temp" (no lexical > scope, remember?). Another reason why his version should be a function. -- Barry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group ***