From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: How to avoid compiler warning `unused lexical variable' for `dolist' or `dotimes'? Date: Thu, 7 Jan 2021 14:12:34 +0300 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1916"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0 (3d08634) (2020-11-07) To: Help GNU Emacs Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jan 07 12:16:03 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 1kxTGs-0000Nb-IZ for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 07 Jan 2021 12:16:02 +0100 Original-Received: from localhost ([::1]:52130 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kxTGr-0006xa-GH for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 07 Jan 2021 06:16:01 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52980) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kxTEO-0005xV-Sf for help-gnu-emacs@gnu.org; Thu, 07 Jan 2021 06:13:28 -0500 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:39491) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kxTEN-0005AG-4Q for help-gnu-emacs@gnu.org; Thu, 07 Jan 2021 06:13:28 -0500 Original-Received: from localhost ([::ffff:41.210.154.95]) (AUTH: PLAIN securesender, TLS: TLS1.2,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 000000000029543E.000000005FF6ECD4.00005630; Thu, 07 Jan 2021 04:13:24 -0700 Mail-Followup-To: Help GNU Emacs Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.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:127045 Archived-At: * Philipp Stephani [2021-01-07 13:07]: > Am Do., 7. Jan. 2021 um 08:59 Uhr schrieb Jean Louis : > > > > (defun db/table-id-plist (table id pg) > > "Returns plist for table by its table_id" > > (let* ((columns (db/table-columns table pg)) > > (sql (db/sql-by-columns table columns id)) > > (values (rcd-sql-first sql pg)) > > (values (append values nil)) > > (length (length columns)) > > (plist '())) > > (dotimes (i length plist) > > (setf plist (plist-put plist (intern (elt columns i)) (elt values i)))))) > > > > > > What is proper way to avoid this warning in `dolist' or `dotimes': > > > > rcd-db.el:841:1: Warning: Unused lexical variable ‘i’ > > This is https://debbugs.gnu.org/cgi/bugreport.cgi?bug=16206. tl;dr: > don't use the three-argument form of `dotimes': > > (dotimes (i length) ; no `plist' here > ...) > plist Yes, thank you, that solves the problem. But it implies that bug should be rather solved as function description for `dotimes' allows return value as third argument. This way is upside down, we tell programmers to not use function that was defined as usable.