From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Tomas Hlavaty Newsgroups: gmane.emacs.help Subject: Re: How to avoid compiler warning `unused lexical variable' for `dolist' or `dotimes'? Date: Sat, 09 Jan 2021 19:57:26 +0100 Message-ID: <87czyekkfd.fsf@logand.com> References: <87zh1kq97s.fsf@robertthorpeconsulting.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36337"; mail-complaints-to="usenet@ciao.gmane.io" To: Stefan Monnier , help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Jan 09 19:57:52 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kyJQu-0009Na-BO for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 09 Jan 2021 19:57:52 +0100 Original-Received: from localhost ([::1]:49152 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kyJQt-0007t8-D5 for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 09 Jan 2021 13:57:51 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57030) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kyJQa-0007so-CX for help-gnu-emacs@gnu.org; Sat, 09 Jan 2021 13:57:32 -0500 Original-Received: from logand.com ([37.48.87.44]:48652) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kyJQY-00016g-R4 for help-gnu-emacs@gnu.org; Sat, 09 Jan 2021 13:57:32 -0500 Original-Received: by logand.com (Postfix, from userid 1001) id 1C68919F7A9; Sat, 9 Jan 2021 19:57:29 +0100 (CET) X-Mailer: emacs 26.3 (via feedmail 11-beta-1 I) In-Reply-To: Received-SPF: pass client-ip=37.48.87.44; envelope-from=tom@logand.com; helo=logand.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:127146 Archived-At: On Fri 08 Jan 2021 at 02:10, Stefan Monnier wrote: > (let ((i --dotimes-counter--)) plist)) In Common Lisp, that part would be solved by (declare (ignorable i)) in the macro: (let ((i --dotimes-counter--)) (declare (ignorable i)) plist) I do not know if Emacs Lisp has ignorable. Maybe this is the missing bit? > You won't get this warning if you do: > > (dotimes (i length (progn (ignore i) plist)) > (setf plist (plist-put plist (intern (elt columns i)) (elt values i)))) > or > (dotimes (i length) > (setf plist (plist-put plist (intern (elt columns i)) (elt values i)))) > plist This is just moving the problem from macro author to macro users.