bug#58288: 29.0.50; (flyspell-correct-word-before-point) followed by <down> crashes emacs

[Eli Zaretskii]

> Cc: 58288@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 04 Oct 2022 13:19:08 +0200
> 
> Andrew John De Angelis <ajd2195@columbia.edu> writes:
> 
> > - emacs -Q
> > - Eval: (turn-on-flyspell)
> 
> Or `M-x flyspell-mode'.
> 
> > - write a word that's not present in the dictionary
> >    (I wrote "incorrectlll")
> > - place cursor at word
> > - M-x flyspell-correct-word-before-point
> > - press down arrow (<down>) to navigate to the 'Save word' option
> > - emacs crashes
> >    (in the terminal, this is the message:
> >    Fatal error 11: Segmentation fault
> >    zsh: abort      emacs -Q
> 
> I can reproduce this crash on Macos (but not on Ubuntu) with the current
> "master".
> 
> However, I'm not well versed in debugging stuff like this on Macos, so
> if somebody else could have a look, that'd be great.

If you or someone else could show a meaningful backtrace, maybe the
reason will become evident.