bug#51321: 29.0.50; date in modelines

[Eli Zaretskii]

> From: Filipp Gunbin <fgunbin@fastmail.fm>
> Cc: alan@idiocy.org,  larsi@gnus.org,  nisoni@algon.dk,  stefan@marxist.se,
>   51321@debbugs.gnu.org,  mardani29@yahoo.es
> Date: Mon, 01 Nov 2021 17:21:36 +0300
> 
> >> So maybe we should check that the locale is valid before setting it...
> >
> > "Valid" in what sense?  Is that locale not installed on your system,
> > or are you saying that it cannot exist?
> 
> I think in the sense of 'locale -a | grep ru' in this case:
> 
> ru_RU.ISO8859-5
> ru_RU.CP866
> ru_RU.CP1251
> ru_RU.UTF-8
> ru_RU.KOI8-R
> ru_RU
> 
> Maybe it could exist, but it doesn't on macOS.
> 
> > (And why does the warning come from Bash when it was Emacs who sets
> > the locale?)
> 
> Forgot to tell - this output shows up when running shell command from
> emacs (M-! or similar).

Hmm... actually, why do we call setenv instead of calling setlocale
directly?  Doesn't macOS support setlocale?  AFAIU, calling setlocale
would then only affect Emacs itself, not its sub-processes.