From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: pjb@informatimago.com (Pascal J. Bourguignon) Newsgroups: gmane.emacs.help Subject: Re: questioning let Date: Thu, 25 Feb 2010 00:41:41 +0100 Organization: Informatimago Message-ID: <87ljeiw6a2.fsf@galatea.lan.informatimago.com> References: <87vddmx3us.fsf@lola.goethe.zz> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: dough.gmane.org 1267058446 2967 80.91.229.12 (25 Feb 2010 00:40:46 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 25 Feb 2010 00:40:46 +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 Feb 25 01:40:42 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 1NkRmT-0005EH-QW for geh-help-gnu-emacs@m.gmane.org; Thu, 25 Feb 2010 01:40:42 +0100 Original-Received: from localhost ([127.0.0.1]:47909 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NkRmS-0003J0-W3 for geh-help-gnu-emacs@m.gmane.org; Wed, 24 Feb 2010 19:40:41 -0500 Original-Path: news.stanford.edu!usenet.stanford.edu!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 44 Original-X-Trace: individual.net IUHfJPm57Y1oJ/+d0sf3DAttZHRm+o7Ht8rQsMeZy0FSdnMvt4 Cancel-Lock: sha1:MjUyMDYwNDY5N2ZkYWYzMGUyYTkzOWJjOGNhMjM0ZTkzMTQzYmI2NA== sha1:w7eNRISVdxuBgysAnq/sTXLXlNU= Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en X-Disabled: X-No-Archive: no User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (darwin) Original-Xref: news.stanford.edu gnu.emacs.help:177083 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:72120 Archived-At: Andreas Röhler writes: > David Kastrup wrote: >> Andreas Roehler writes: >> >>> Hi, >>> >>> behaviour of the example code below puzzles me. Would >>> expect setting of arg by external function, but inside >>> `let', recognised. But remains `1'. >>> >>> (defun arg-setting () >>> (interactive) >>> (let ((arg 1)) >>> (message "%s" arg) >>> (arg-extern arg) >>> (message "%s" arg))) >>> >>> (defun arg-extern (arg) >>> (setq arg (1- arg))) >>> >>> Any help? >> >> The argument binding in arg-extern is the innermost one and consequently >> the only affected one. If you make the function argument-less, it will >> likely work as expected by you, affecting the binding in arg-setting. >> > > > That works, thanks a lot! > However, stored in some eil.el, get a compiler warning than: > > > In arg-extern: > eil.el:9:9:Warning: reference to free variable `arg' > eil.el:9:17:Warning: assignment to free variable `arg' > > Would think a useless warning, as the compiler should know being inside a let (?) Yes, as I said, this is something that you shoudl avoid, and the compiler is of the same opinion. -- __Pascal Bourguignon__