From: Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Undo defalias
Date: Fri, 03 Mar 2023 10:49:57 -0500 [thread overview]
Message-ID: <jwvbkl9j0vp.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: 7c6ec4cae36f1fba2e3b@heytings.org
>> Depends on how it got set to `ignore` (you can try exiting from
>> a recursive edit or a minibuffer), but in many cases it's impossible: the
>> #<subr message> object may simply not be reachable from anywhere any
>> more :-(
> It is: see the short POC code I posted.
The POC you posted works only if `message` was redefined in some
particular way, such as when a loading a file that has
(defalias 'message #'ignore)
but then it wouldn't be the result of a bug but of deliberate harm :-)
AFAIK most cases where `message` can end up aliased to `ignore` is when
you have code doing
(cl-letf (((symbol-function 'message) #'ignore))
...)
In that case, the previous value won't be found in `function-history`.
As for why is the `ignore` rebinding is still active...
Stefan
next prev parent reply other threads:[~2023-03-03 15:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-28 1:23 Undo defalias Óscar Fuentes
2023-02-28 9:17 ` Gregory Heytings
2023-02-28 15:56 ` Óscar Fuentes
2023-03-01 20:36 ` Emanuel Berg
2023-03-03 15:29 ` Stefan Monnier via Users list for the GNU Emacs text editor
2023-03-03 15:37 ` Gregory Heytings
2023-03-03 15:49 ` Stefan Monnier via Users list for the GNU Emacs text editor [this message]
2023-03-03 15:52 ` Eli Zaretskii
2023-03-03 16:01 ` Gregory Heytings
2023-03-03 16:00 ` Óscar Fuentes
2023-03-03 16:17 ` Gregory Heytings
2023-03-03 16:33 ` Stefan Monnier via Users list for the GNU Emacs text editor
2023-03-03 21:11 ` Óscar Fuentes
2023-03-05 9:32 ` Madhu
2023-03-03 22:58 ` Gregory Heytings
2023-03-04 0:05 ` Stefan Monnier
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