From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: How to avoid compiler warning `unused lexical variable' for `dolist' or `dotimes'? Date: Fri, 08 Jan 2021 02:12:21 +0100 Message-ID: <87mtxknsei.fsf@zoho.eu> References: Reply-To: Emanuel Berg 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="18510"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:og/OwqoyErMVTIF29TiSwg+OKVc= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jan 08 02:21:22 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 1kxgSw-0004gZ-Bm for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 08 Jan 2021 02:21:22 +0100 Original-Received: from localhost ([::1]:52580 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kxgSv-0007fU-E7 for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 07 Jan 2021 20:21:21 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48426) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kxgRi-0007el-Nx for help-gnu-emacs@gnu.org; Thu, 07 Jan 2021 20:20:06 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:51356) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kxgRh-0007Lg-4B for help-gnu-emacs@gnu.org; Thu, 07 Jan 2021 20:20:06 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kxgRd-0003Ec-QQ for help-gnu-emacs@gnu.org; Fri, 08 Jan 2021 02:20:01 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.248, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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:127070 Archived-At: Jean Louis wrote: >> Same as for any other place where you might declare >> a variable that you don't actually use: make sure the var's >> name starts with an underscore. This tells the compiler >> that you're aware of the fact the var is not used (but >> still want this variable there for some reason; e.g. >> in dotimes and dolist you don't have the choice not to put >> a variable there). >> >> Traditionally for `dotimes`, I'd then use `_` as the >> variable name unless I really want to give a hint to the >> reader about what kind of things I'm counting like (dotimes >> (_column-nb ...) ...). > > That also sounds like workaround around the real problem. > In `dotimes' I do use the VAR counted. It is not same as > (let ((_ (execute some program without)))) But is this really a workaround in your case? Because you _do_ use it! (dolist (_ignored-var '(a b c)) (message "%s" _ignored-var) ) geh.el:257:1: Warning: variable ‘_ignored-var’ not left unused See? Sometimes the byte-compiler gets it right! :) -- underground experts united http://user.it.uu.se/~embe8573 https://dataswamp.org/~incal