From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: unused lexical variable in `cl-loop' Date: Sat, 01 Oct 2022 00:59:01 +0200 Message-ID: <87edvscvuy.fsf@dataswamp.org> References: <8735cclf95.fsf@dataswamp.org> <87r0zv3c4w.fsf@sperrhaken.name> 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="39254"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:oJ6BNSdx43ZiqsHHs2ypw4U5Vzs= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Oct 01 14:47:55 2022 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 1oebuN-000A2X-Cg for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 01 Oct 2022 14:47:55 +0200 Original-Received: from localhost ([::1]:44266 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oebuM-0007Pz-9L for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 01 Oct 2022 08:47:54 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35016) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oeOyR-0006K7-NS for help-gnu-emacs@gnu.org; Fri, 30 Sep 2022 18:59:15 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:40898) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oeOyO-0002S7-Ts for help-gnu-emacs@gnu.org; Fri, 30 Sep 2022 18:59:15 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1oeOyM-0002hc-13 for help-gnu-emacs@gnu.org; Sat, 01 Oct 2022 00:59:10 +0200 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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Sat, 01 Oct 2022 08:45:40 -0400 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 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:139687 Archived-At: Felix Dietrich wrote: > (cl-block nil > (let* > ((i min) > (--cl-var-- max) > (num nil) > (num nil)) > (while > (<= i --cl-var--) > (setq num > (nconc num > (list i))) > (setq i > (+ i 1))) > num)) > > The variable ‘num’ is bound twice That's right, if you bind the same lexical/static variable more than once you get the "Unused lexical variable" warning for every occasion and it doesn't matter if it's used or not. (let ((one 1) (one 1) ) one) ;; Warning: Unused lexical variable `one' ;; Warning: Unused lexical variable `one' But if you do this ... (let ((one 1) (one 2) ) one) You only get a warning for the first one ... ;; Warning: Unused lexical variable `one' -- underground experts united https://dataswamp.org/~incal