From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ulrich Mueller Newsgroups: gmane.emacs.bugs Subject: bug#73596: 29.4; empty (let) does not signal an error Date: Sat, 12 Oct 2024 15:54:56 +0200 Message-ID: References: <861q0ly337.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="2586"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: Eli Zaretskii , 73596@debbugs.gnu.org To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Oct 12 15:56:05 2024 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 1szcbE-0000X0-Uw for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 12 Oct 2024 15:56:05 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1szcb1-0001n3-C3; Sat, 12 Oct 2024 09:55:51 -0400 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 1szcaz-0001mf-5r for bug-gnu-emacs@gnu.org; Sat, 12 Oct 2024 09:55:49 -0400 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 1szcay-0005ke-TL for bug-gnu-emacs@gnu.org; Sat, 12 Oct 2024 09:55:48 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debbugs.gnu.org; s=debbugs-gnu-org; h=MIME-Version:Date:References:In-Reply-To:From:To:Subject; bh=9VmMvp1K0Xa/QQKwPEW6+6x5CKDWdQhEvO3IZJCu+Nw=; b=uk/WTZGvaXVipNQdhf6VCLDC/0n66QNVzIU8dICumiI+XAHSMMjz4lkNtGoNbpfLUH7i4aVXJJmYE/R5ge9GruNAT6V6MUuC4y8jfPH81guwF3AYPjlIWkZmuHHfaSuPU9Sa7dPt/HkU1irKHGBSwLIwRSM08sfOQ6jeONEnRMBl/mftILEH2Na45aYyoXyGS6Gsjuzo8+vkrBleLDwEHSwwoZuE+1F/r+6GKcWVBi15nWwhIIelH3/CwPhV4nQOIDBv7T74SrBKil/3/gH2NxUCW+wYjoMpmOXsqeSsDE+eZTeLFmFtXI5qTSwPUfBrFpX9W/6ZT0blASwFm1Rhtg==; Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1szcbC-0000q7-Mv for bug-gnu-emacs@gnu.org; Sat, 12 Oct 2024 09:56:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Ulrich Mueller Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 12 Oct 2024 13:56:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 73596 X-GNU-PR-Package: emacs Original-Received: via spool by 73596-submit@debbugs.gnu.org id=B73596.17287413563008 (code B ref 73596); Sat, 12 Oct 2024 13:56:02 +0000 Original-Received: (at 73596) by debbugs.gnu.org; 12 Oct 2024 13:55:56 +0000 Original-Received: from localhost ([127.0.0.1]:45771 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1szcb5-0000mI-8l for submit@debbugs.gnu.org; Sat, 12 Oct 2024 09:55:55 -0400 Original-Received: from woodpecker.gentoo.org ([140.211.166.183]:38974 helo=smtp.gentoo.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1szcb2-0000jY-9H for 73596@debbugs.gnu.org; Sat, 12 Oct 2024 09:55:52 -0400 In-Reply-To: (Stefan Monnier's message of "Sat, 12 Oct 2024 09:43:53 -0400") 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:293438 Archived-At: >>>>> On Sat, 12 Oct 2024, Stefan Monnier wrote: >>> Not sure if the following is an error or the intended behavior. >>> IIUC empty (let) should signal an error, and it did so in Emacs 27.2. >>> However, it returns nil now. > The compiler emits a warning when encountering a `let` without a body, > which I think is the most important aspect. > Returning nil (when the user decides to run the code despite the > warning) seems just as good as signaling an error. Just don't rely on it. (func-arity 'let) =E2=87=92 (1 . unevalled) Shouldn't this be updated to return (0 . unevalled) when empty (let) is allowed?