From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: FW: How to avoid compiler warning `unused lexical variable' for `dolist' or `dotimes'? Date: Thu, 07 Jan 2021 21:26:12 -0500 Message-ID: References: <87o8i1ou7m.fsf@zoho.eu> <0db0bc9d-7efb-4d3e-8462-545d0a5b25f5@default> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="34712"; 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:UValgib8tyGEim7C5pqtWRGRlKs= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jan 08 03:30:55 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 1kxhYF-0008wt-29 for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 08 Jan 2021 03:30:55 +0100 Original-Received: from localhost ([::1]:47712 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kxhYE-0007Qy-44 for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 07 Jan 2021 21:30:54 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:58534) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kxhXS-00077P-FU for help-gnu-emacs@gnu.org; Thu, 07 Jan 2021 21:30:06 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:49282) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kxhXR-0005sy-1w for help-gnu-emacs@gnu.org; Thu, 07 Jan 2021 21:30:06 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kxhXO-00082V-BQ for help-gnu-emacs@gnu.org; Fri, 08 Jan 2021 03:30:02 +0100 X-Injected-Via-Gmane: http://gmane.org/ 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:127075 Archived-At: > What we talk is return value in third place of `(dolist (first second > third))' and it is strange that if return value is asked from `dolist' > that then the `first' one is warned about. The third arg is different from "the expression after `dotimes`" in one important respect: the third arg can refer to the iteration variable which will contain the "last" value: (dotimes (i 10 i) nil) will return 10. So the warning comes when you use that 3rd arg but without referring to the iteration variable: in that case, you could have put the result *after* `dotimes` rather than putting it in the 3rd arg. Stefan