bug#71370: 30.0.50; Please un-obsolete buffer-substring as a generalized variable

[Eli Zaretskii]

> Cc: Adam Porter <adam@alphapapa.net>, 71370@debbugs.gnu.org,
>  Ihor Radchenko <yantar92@posteo.net>
> Date: Sat, 22 Jun 2024 00:52:43 +0200
> From:  Michael Heerdegen via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> These were exactly the kind of problems why those place expressions had
> been obsoleted.  Adding a little helper function with clear semantics
> really looks more appropriate in this case in my opinion, even if you
> have to remember one more name.

Agreed.