bug#66743: 30.0.50; Crash when dumping reftex

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: Stefan Kangas <stefankangas@gmail.com>, Eli Zaretskii <eliz@gnu.org>,
>  66743@debbugs.gnu.org
> Date: Thu, 26 Oct 2023 11:55:38 +0000
> 
> >> May you please point me to a way to output warning to stderr from inside
> >> pdumper code?
> >
> > fprintf (stderr, ...) I'd say.
> 
> That's more obvious than I thought :)
> 
> See the attached patch.

If you are suggesting this for upstream, then it's not optimal, at
least in interactive session: the stderr stream is usually redirected
to some bottomless OS pit where no one could see it.