From: Alan Mackenzie <acm@muc.de>
To: 67196@debbugs.gnu.org
Subject: bug#67196: M-: uses a wrong value of debug-on-error when it is nil.
Date: Wed, 15 Nov 2023 13:48:40 +0000 [thread overview]
Message-ID: <ZVTMOH229jaiw86s@ACM> (raw)
Hello, Emacs.
On the master branch (and probably any recent Emacs):
(i) emacs -Q
(ii) C-h v debug-on-error RET
(iii) M-: debug-on-error RET
From (ii) it will be seen that debug-on-error's value is nil.
(iii) wrongly reports that its value is t. This is a bug.
#########################################################################
What is happening here is that eval-expression binds debug-on-error to
an uninterned symbol called "t", so that d-o-e will be set to non-nil
for the evaluation of the coming form.
This has the unwanted side effect of ignoring the actual value of d-o-e
in forms which use it. For example, if the variable is set to a list of
error symbols, this value gets ignored on evaluating a form with M-:.
--
Alan Mackenzie (Nuremberg, Germany).
next reply other threads:[~2023-11-15 13:48 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-15 13:48 Alan Mackenzie [this message]
2023-11-15 17:19 ` bug#67196: M-: uses a wrong value of debug-on-error when it is nil Eli Zaretskii
2023-11-15 17:55 ` Alan Mackenzie
2023-11-19 17:19 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-11-19 17:33 ` Eli Zaretskii
[not found] ` <87a5r9efj0.fsf@dick>
2023-11-19 19:30 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-11-24 17:10 ` Alan Mackenzie
2023-11-24 18:48 ` Eli Zaretskii
2023-11-24 20:54 ` Alan Mackenzie
2023-11-24 21:25 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-11-24 22:21 ` Alan Mackenzie
2023-11-25 7:59 ` Eli Zaretskii
2023-11-25 10:32 ` Alan Mackenzie
2023-11-25 11:15 ` Eli Zaretskii
2023-11-25 12:40 ` Alan Mackenzie
2023-11-25 13:04 ` Eli Zaretskii
2023-11-25 14:14 ` Alan Mackenzie
2023-11-25 15:50 ` Eli Zaretskii
2023-11-25 16:40 ` Alan Mackenzie
2023-11-25 16:46 ` Eli Zaretskii
2023-11-25 16:57 ` Alan Mackenzie
2023-11-25 17:36 ` Alan Mackenzie
2023-11-25 18:12 ` Andreas Schwab
2023-11-25 14:23 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-12-17 4:23 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-12-19 3:54 ` Richard Stallman
2023-12-19 5:05 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-12-25 3:41 ` Richard Stallman
2023-12-26 2:39 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-12-27 4:54 ` Richard Stallman
2023-11-25 7:30 ` Eli Zaretskii
2023-11-24 20:22 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-24 21:33 ` Alan Mackenzie
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