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: [External] : Re: How to make M-x TAB not work on (interactive) declaration? Date: Mon, 16 Jan 2023 18:38:44 +0300 Message-ID: References: <87y1qdct5m.fsf@gnu.org> <874jt0imh0.fsf@dataswamp.org> 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="24621"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.2.9+54 (af2080d) (2022-11-21) Cc: "help-gnu-emacs@gnu.org" To: Anders Munch Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Jan 16 16:52:49 2023 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 1pHRmz-0006Bi-6X for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 16 Jan 2023 16:52:49 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pHRlh-0006Pc-NO; Mon, 16 Jan 2023 10:51:29 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pHRlf-0006PU-Hq for help-gnu-emacs@gnu.org; Mon, 16 Jan 2023 10:51:27 -0500 Original-Received: from stw1.rcdrun.com ([217.170.207.13]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pHRle-0003cc-0C for help-gnu-emacs@gnu.org; Mon, 16 Jan 2023 10:51:27 -0500 Original-Received: from localhost ([::ffff:197.239.8.177]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000056103.0000000063C57260.00000FE3; Mon, 16 Jan 2023 08:50:55 -0700 Mail-Followup-To: Anders Munch , "help-gnu-emacs@gnu.org" 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: 2.1.29 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:142273 Archived-At: * Anders Munch [2023-01-16 13:58]: > Jean Louis wrote: > > I actually expect function to tell me wrong number of arguments or no arguments, as I find it safer for programming that way. > > It makes sense for > (+) > to be an error, if it's written like that. > But if the code goes > (apply #'+ a-list-of-numbers) > then a-list-of-numbers being empty is normal and expected, and 0 is invariably the desired result. > You can't make the former an error without the latter becoming an error as well, so it isn't. (apply #'+ nil) that is what you mean why is it usable? than this is disaster: (apply #'* nil) ➜ 1 Do you wish to say that `apply' function is reason for this below? (*) ➜ 1 and (+) ➜ 0 and (-) ➜ 0 Maybe you know some reference to Lisp beginning why is it so? -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/