bug#62009: 29.0.60; Emacs crashes on setf symbol-name

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Daniel Mendler <mail@daniel-mendler.de>,  Philip Kaludercic
>  <philipk@posteo.net>,  michael_heerdegen@web.de,  Gregory Heytings
>  <gregory@heytings.org>,  monnier@iro.umontreal.ca,  62009@debbugs.gnu.org,
>   Eli Zaretskii <eliz@gnu.org>,  Augusto Stoffel <arstoffel@gmail.com>
> Date: Mon, 13 Mar 2023 16:28:10 +0800
> 
> Robert Pluim <rpluim@gmail.com> writes:
> 
> >>>>>> On Sat, 11 Mar 2023 15:07:56 +0800, Po Lu <luangruo@yahoo.com> said:
> >
> >     Po Lu> Why does this have to be in SSET and not in PURE_P?
> >
> > That would work as well, although I thought purespace was going away?
> >
> > Robert
> 
> Once pure space goes away, we can change the call to PURE_P in Faset to
> only check if the string is read-only.

There's no reason to believe someone will remember that.  Just don't
add anything that will require changes when we remove pure space
(except if it's specific to the unexec build).