From: Eli Zaretskii <eliz@gnu.org>
To: Alan Mackenzie <acm@muc.de>, Stefan Monnier <monnier@iro.umontreal.ca>
Cc: 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 19:19:17 +0200 [thread overview]
Message-ID: <83a5rfq6i2.fsf@gnu.org> (raw)
In-Reply-To: <ZVTMOH229jaiw86s@ACM> (message from Alan Mackenzie on Wed, 15 Nov 2023 13:48:40 +0000)
> Date: Wed, 15 Nov 2023 13:48:40 +0000
> From: Alan Mackenzie <acm@muc.de>
>
> 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-:.
Aren't we doing this on purpose, Stefan?
next prev parent reply other threads:[~2023-11-15 17:19 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-15 13:48 bug#67196: M-: uses a wrong value of debug-on-error when it is nil Alan Mackenzie
2023-11-15 17:19 ` Eli Zaretskii [this message]
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
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