bug#66187: read-file-name unexpected behavior when MUSTMATCH is a function

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: joseph@breatheoutbreathe.in,  michael_heerdegen@web.de,
>   philipk@posteo.net,  66187@debbugs.gnu.org
> Date: Sat, 07 Oct 2023 10:25:13 -0400
> 
> > So you are saying that the current uses of MUSTMATCH simply don't do
> > what the change was supposed to allow?
> 
> I think so: the original use (don't know if there are others out there)
> wants the behavior that is being discussed rather than the behavior that
> is currently provided.

Then I think we should install your patch on the emacs-29 branch,
thanks.