bug#50268: 28.0.50; Assertion warning during native compilation

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 50720@debbugs.gnu.org,  50268@debbugs.gnu.org, Eli Zaretskii 
> <eliz@gnu.org>
> Date: Tue, 21 Sep 2021 18:11:34 +0200
> 
> Mattias Engdegård <mattiase@acm.org> writes:
> 
> > Now, either we fix this bug or we stop pretending that unnamed &rest
> > arguments work at all and signal an error, because it's clear from the
> > above that they can't have seen much use.
> 
> I did a quick grep through core and GNU ELPA, and I couldn't find any
> instances of it being used, so I'd be fine with either solution (i.e.,
> either fixing the bug or signalling an error).
> 
> Perhaps Eli has an opinion (added to the CCs).

I think I'd like to at least see the prototype of the fix to have an
opinion.