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: unused lexical variable in `cl-loop' Date: Tue, 27 Sep 2022 22:43:50 +0200 Message-ID: <8735cclf95.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="10738"; 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:B9p0ceWiMIRNofiau/XRxLpIMks= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Sep 28 12:01:34 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 1odTsk-0002gA-2O for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 28 Sep 2022 12:01:34 +0200 Original-Received: from localhost ([::1]:56894 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1odTsj-0005LH-14 for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 28 Sep 2022 06:01:33 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35344) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1odHQw-0004MK-MK for help-gnu-emacs@gnu.org; Tue, 27 Sep 2022 16:44:02 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:43938) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1odHQu-00077n-VE for help-gnu-emacs@gnu.org; Tue, 27 Sep 2022 16:44:02 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1odHQr-0004KI-D8 for help-gnu-emacs@gnu.org; Tue, 27 Sep 2022 22:43:57 +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: Wed, 28 Sep 2022 05:47:52 -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:139655 Archived-At: This code works but the byte-compiler says the lexical variable 'num' is unused on the first two occasions it occurs in the code. ;;; -*- lexical-binding: t -*- ;; ;; this file: ;; https://dataswamp.org/~incal/emacs-init/math.el (require 'cl-lib) (defun interval (&optional min max) (interactive "nmin: \nnmax: ") (or min (setq min 0)) (or max (setq max 9)) (unless (<= min max) (error "Bogus interval") ) (cl-loop for i from min to max with num = () collect i into num finally return num) ) ;; (interval 10 5) ;; (interval) ;; (interval 19 99) ;; Warning: Unused lexical variable `num' ;; Warning: Unused lexical variable `num' I don't know if that makes sense, it doesn't look like it, however it gave me an idea: (defun interval (&optional min max) (interactive "nmin: \nnmax: ") (or min (setq min 0)) (or max (setq max 9)) (unless (<= min max) (error "Bogus interval") ) (cl-loop for i from min to max collect i) ) and indeed that works just as well and there isn't a warning. So that's good ... but why nothing happens with 'num' in the first attempt I wonder? -- underground experts united https://dataswamp.org/~incal