From: "Mattias Engdegård" <mattias.engdegard@gmail.com>
To: Robert Pluim <rpluim@gmail.com>
Cc: emacs-devel <emacs-devel@gnu.org>, Juri Linkov <juri@linkov.net>
Subject: Re: New unwind-protect byte-compiler warning
Date: Tue, 4 Apr 2023 13:20:59 +0200 [thread overview]
Message-ID: <02132809-BAFB-4C1F-BC32-B6C510F3B4E3@gmail.com> (raw)
In-Reply-To: <87fs9ghr96.fsf@gmail.com>
4 apr. 2023 kl. 12.32 skrev Robert Pluim <rpluim@gmail.com>:
> In mouse-wheel-global-text-scale:
> mwheel.el:450:6: Warning: ‘unwind-protect’ without unwind forms
>
> is because weʼre protecting against errors from
> `global-text-scale-adjust', but unlike `text-scale-{in,de}crease',
> that doesnʼt signal an error when you reach the scale limit.
>
> Juri, we can add an unwind form of `t'
Note that `unwind-protect` does not itself "protect against errors". An error signalled by the protected form will still be signalled after execution of the unwind forms. An unwind form of `t` makes no more sense than none at all; the value is just thrown away.
Evidently there are a few cases of
(unwind-protect FORM CONSTANT)
in the Emacs tree (and GNU ELPA); it probably makes sense to warn about them as well since they often arise from a misunderstanding of what `unwind-protect` does.
next prev parent reply other threads:[~2023-04-04 11:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-30 8:01 New unwind-protect byte-compiler warning Mattias Engdegård
2023-03-30 10:08 ` Emanuel Berg
2023-04-01 22:56 ` Basil L. Contovounesios
2023-04-04 10:32 ` Robert Pluim
2023-04-04 11:20 ` Mattias Engdegård [this message]
2023-04-04 12:26 ` Robert Pluim
2023-04-04 12:32 ` Gregory Heytings
2023-04-04 16:10 ` Juri Linkov
2023-04-07 17:40 ` Mattias Engdegård
2023-04-09 14:20 ` Michael Albinus
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