From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#67669: 29.1; Drop text suggesting using `and' to replace `if' Date: Thu, 07 Dec 2023 22:22:57 +0200 Message-ID: <83plzh225a.fsf@gnu.org> References: <87v89buhpl.fsf@debian-hx90.lan> <83sf4e34s8.fsf@gnu.org> <87r0jytm58.fsf@debian-hx90.lan> <83a5qm2u8v.fsf@gnu.org> <87fs0ducme.fsf@debian-hx90.lan> <83v89928xe.fsf@gnu.org> <87bkb1u6tv.fsf@debian-hx90.lan> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="13180"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 67669-done@debbugs.gnu.org To: Xiyue Deng Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Dec 07 21:24:16 2023 Return-path: Envelope-to: geb-bug-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 1rBKuu-0003D2-EX for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 07 Dec 2023 21:24:16 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rBKuW-0003PJ-FD; Thu, 07 Dec 2023 15:23:52 -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 1rBKuU-0003Ok-Jn for bug-gnu-emacs@gnu.org; Thu, 07 Dec 2023 15:23:50 -0500 Original-Received: from debbugs.gnu.org ([2001:470:142:5::43]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1rBKuU-0007vC-C1 for bug-gnu-emacs@gnu.org; Thu, 07 Dec 2023 15:23:50 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1rBKug-0001a2-HG for bug-gnu-emacs@gnu.org; Thu, 07 Dec 2023 15:24:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 07 Dec 2023 20:24:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 67669 X-GNU-PR-Package: emacs Original-Received: via spool by 67669-done@debbugs.gnu.org id=D67669.17019805945984 (code D ref 67669); Thu, 07 Dec 2023 20:24:02 +0000 Original-Received: (at 67669-done) by debbugs.gnu.org; 7 Dec 2023 20:23:14 +0000 Original-Received: from localhost ([127.0.0.1]:43220 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1rBKtu-0001YR-HY for submit@debbugs.gnu.org; Thu, 07 Dec 2023 15:23:14 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55650) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1rBKtp-0001Y2-Ut for 67669-done@debbugs.gnu.org; Thu, 07 Dec 2023 15:23:13 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rBKtX-0007Ke-UN; Thu, 07 Dec 2023 15:22:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=6FySp+Z7pLSZJJ9vy2RgB8oISjgs2uzmQzqhclatq6I=; b=HSwkzELIXByP 98rO5sKsQNf9DeF6Ydz5uaz0mDoohbNnZRj8NRElciCzbQceOrUC50qhA05k0s+UPA5lMxKyD3b+5 1VNtPjbX0uOy/nk2LkhsO9KROS24VA/0DWW4Vn+7XERAkelcF7n7IuXFZuu6gv1OcyEYTkLf8DUGf vLIlOOdSudhPZvDIIFuZ2JQqPCxi7qJaVfV+14bpAdGuWs7k73hS2eH2JFKvs+PLLXHOnMj/JJHuE Og26OVUeVuLnoyLeHLfc94/5yPDIaOGVqq5KZC10tP4Eln1y2imlPVrAH6PBOM9xnI04TrB46Si8q RBg/aH+9H3P+OkjvZrbORQ==; In-Reply-To: <87bkb1u6tv.fsf@debian-hx90.lan> (message from Xiyue Deng on Thu, 07 Dec 2023 11:54:20 -0800) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:275703 Archived-At: > From: Xiyue Deng > Cc: 67669-done@debbugs.gnu.org > Date: Thu, 07 Dec 2023 11:54:20 -0800 > > Eli Zaretskii writes: > > > Sorry, I don't understand what you mean by "guarding a side effect", > > I was referring to whether we care about and use the result of the > statement/function call. In `and' we do, in `if' we don't and we just > use the side effect. But that's not true. 'if' does return a value, and we do use it. Consider this random example: (defsubst posn-area (position) [...] (let ((area (if (consp (nth 1 position)) (car (nth 1 position)) (nth 1 position)))) (and (symbolp area) area))) Here we bind 'area' to the value returned by 'if'. > As I was just trying to argue just "a bit", I won't be insisting either. > Thanks for listening, and let me close this. Thanks.