bug#40317: 27.0.90; Reverting a buffer that visits C file signals an error

[Eli Zaretskii]

> From: Damien Cassou <damien@cassou.me>
> Cc: 40317@debbugs.gnu.org
> Date: Wed, 16 Sep 2020 16:51:42 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> > Does that happen with _any_ C# file?  If not, can you post an example
> > of a file where this happens, and a recipe to reproduce the problem?
> 
> I don't know how to reproduce, it is infrequent and seems random.

Ah, so it isn't consistent.

And the Lisp backtrace is the same as the one shown in the original
report?