GNU bug report logs - #73596
29.4; empty (let) does not signal an error

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Package: emacs;

Reported by: Ulrich Mueller <ulm <at> gentoo.org>

Date: Wed, 2 Oct 2024 12:55:02 UTC

Severity: normal

Tags: wontfix

Found in version 29.4

Done: Stefan Kangas <stefankangas <at> gmail.com>

Bug is archived. No further changes may be made.

Full log

Message #14 received at 73596 <at> debbugs.gnu.org (full text, mbox):

From: Ulrich Mueller <ulm <at> gentoo.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 73596 <at> debbugs.gnu.org
Subject: Re: bug#73596: 29.4; empty (let) does not signal an error
Date: Sat, 12 Oct 2024 15:54:56 +0200

>>>>> On Sat, 12 Oct 2024, Stefan Monnier wrote:

>>> Not sure if the following is an error or the intended behavior.
>>> IIUC empty (let) should signal an error, and it did so in Emacs 27.2.
>>> However, it returns nil now.

> The compiler emits a warning when encountering a `let` without a body,
> which I think is the most important aspect.

> Returning nil (when the user decides to run the code despite the
> warning) seems just as good as signaling an error.  Just don't rely on it.

(func-arity 'let)  ⇒  (1 . unevalled)

Shouldn't this be updated to return (0 . unevalled) when empty (let)
is allowed?
This bug report was last modified 198 days ago.

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