From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: emacs-27 breaks null function Date: Mon, 06 Apr 2020 20:52:14 +0200 Message-ID: <87ftdgfnvl.fsf@igel.home> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="31391"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.90 (gnu/linux) Cc: emacs-devel@gnu.org To: "Nelson H. F. Beebe" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Apr 06 20:53:00 2020 Return-path: Envelope-to: ged-emacs-devel@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 1jLWrj-00083j-Sw for ged-emacs-devel@m.gmane-mx.org; Mon, 06 Apr 2020 20:52:59 +0200 Original-Received: from localhost ([::1]:37182 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jLWri-0001iX-Uo for ged-emacs-devel@m.gmane-mx.org; Mon, 06 Apr 2020 14:52:58 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49526) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jLWr5-0000iv-8N for emacs-devel@gnu.org; Mon, 06 Apr 2020 14:52:20 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jLWr4-0008Gh-23 for emacs-devel@gnu.org; Mon, 06 Apr 2020 14:52:18 -0400 Original-Received: from mail-out.m-online.net ([212.18.0.9]:50423) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jLWr3-0008DS-Sd for emacs-devel@gnu.org; Mon, 06 Apr 2020 14:52:18 -0400 Original-Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 48x05W54RWz1qsk9; Mon, 6 Apr 2020 20:52:15 +0200 (CEST) Original-Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 48x05W4qdcz1qqkR; Mon, 6 Apr 2020 20:52:15 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Original-Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id PdTaN3FnEZu9; Mon, 6 Apr 2020 20:52:15 +0200 (CEST) X-Auth-Info: 2+Ivg89HI4+ML7g71kfcBMI/qKC+Jj7ZaQ7UnwwX3LMyznXB/NqYSBdDddY2U0ww Original-Received: from igel.home (ppp-46-244-165-152.dynamic.mnet-online.de [46.244.165.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Mon, 6 Apr 2020 20:52:15 +0200 (CEST) Original-Received: by igel.home (Postfix, from userid 1000) id 7B75D2C024C; Mon, 6 Apr 2020 20:52:14 +0200 (CEST) X-Yow: Alright, you!! Imitate a WOUNDED SEAL pleading for a PARKING SPACE!! In-Reply-To: (Nelson H. F. Beebe's message of "Mon, 6 Apr 2020 12:37:38 -0600") X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 212.18.0.9 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:246556 Archived-At: On Apr 06 2020, Nelson H. F. Beebe wrote: > Thanks, that solves the problem for the particular use of executing-macro, > but what about testing for an undefined variable in general, such as > > (null this-var-might-not-be-defined-but-might-also-be-defined) > ? You are not testing for an undefined variable, you are trying to evaluate an unbound variable. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."