From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.bugs Subject: bug#67196: M-: uses a wrong value of debug-on-error when it is nil. Date: Sat, 25 Nov 2023 10:32:23 +0000 Message-ID: References: <83a5rfq6i2.fsf@gnu.org> <83ttpbdm2f.fsf@gnu.org> <83il5qe00e.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12087"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 67196@debbugs.gnu.org, monnier@iro.umontreal.ca To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Nov 25 11:33:17 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 1r6pyO-0002tT-OJ for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 25 Nov 2023 11:33:16 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r6py7-0004rm-1O; Sat, 25 Nov 2023 05:32:59 -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 1r6py5-0004rX-4n for bug-gnu-emacs@gnu.org; Sat, 25 Nov 2023 05:32:57 -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 1r6py4-0001rU-SU for bug-gnu-emacs@gnu.org; Sat, 25 Nov 2023 05:32:56 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1r6py9-0005f8-Py for bug-gnu-emacs@gnu.org; Sat, 25 Nov 2023 05:33:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Alan Mackenzie Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 25 Nov 2023 10:33:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 67196 X-GNU-PR-Package: emacs Original-Received: via spool by 67196-submit@debbugs.gnu.org id=B67196.170090835921734 (code B ref 67196); Sat, 25 Nov 2023 10:33:01 +0000 Original-Received: (at 67196) by debbugs.gnu.org; 25 Nov 2023 10:32:39 +0000 Original-Received: from localhost ([127.0.0.1]:37929 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1r6pxm-0005eU-Iz for submit@debbugs.gnu.org; Sat, 25 Nov 2023 05:32:39 -0500 Original-Received: from mail.muc.de ([193.149.48.3]:27068) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1r6pxj-0005eD-5w for 67196@debbugs.gnu.org; Sat, 25 Nov 2023 05:32:38 -0500 Original-Received: (qmail 10756 invoked by uid 3782); 25 Nov 2023 11:32:24 +0100 Original-Received: from acm.muc.de (pd953a2e3.dip0.t-ipconnect.de [217.83.162.227]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Sat, 25 Nov 2023 11:32:24 +0100 Original-Received: (qmail 13401 invoked by uid 1000); 25 Nov 2023 10:32:23 -0000 Content-Disposition: inline In-Reply-To: <83il5qe00e.fsf@gnu.org> X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de 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:274950 Archived-At: Hello, Eli. On Sat, Nov 25, 2023 at 09:59:45 +0200, Eli Zaretskii wrote: > > Date: Fri, 24 Nov 2023 22:21:27 +0000 > > Cc: Eli Zaretskii , 67196@debbugs.gnu.org, acm@muc.de > > From: Alan Mackenzie > > > So you kicked the can a bit further down the road. > > > The next bug report will be that `M-: debug-from--eval-expression` does > > > not return the expected value. > > Not at all. debug-from--eval-expression is a purely internal variable, > > unlike debug-on-error which is intended for user use. It is bound in > > exactly one place, and tested in exactly one place. > > Anybody reporting such a "bug" would legitimately get the reply "not a > > bug". > How about not exposing the internal variable to Lisp at all? That's a very good idea. It would need little more than a new C function which would bind that variable then call eval. Maybe move eval-expression-debug-on-error into eval.c, too. > > For what it's worth, I lost about 10 hours of time trying to debug > > a situation where I wasn't getting a backtrace, despite debug-on-error > > being t. The problem was that d-o-e wasn't t at all, it was nil. M-: > > had been lying. > You never described that situation, AFAICT. I think you should, so > that we could assess how grave the problem is, which is an important > part of deciding whether the solution you propose is useful. I don't > understand how could you NOT get a backtrace when debug-on-error is > non-nil. Sorry, I wasn't clear enough. During those 10 hours, I was under the impression that debug-on-error was t, because M-: debug-on-error said so. It actually was nil. That's why I submitted this bug report. -- Alan Mackenzie (Nuremberg, Germany).