bug#67569: 29.1; ruby-mode syntax highlighting breaks with variable named "index" and "/" operator

[Eli Zaretskii]

> Date: Sat, 9 Dec 2023 19:38:28 +0200
> Cc: mjh@mjhoy.com, 67569@debbugs.gnu.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> >> Eli, should we put this in Emacs 29.2? It's not a regression (a fairly
> >> old problem), but the fix looks simple enough.
> > Yes, please.
> 
> Very good, pushed to emacs-29.
> 
> Here's a second patch on top which gets rid of the whitelist altogether 
> (the new heuristic seems to cover the cases better anyway), though I'm 
> on the fence whether this should go here or into master.
> 
> It seems to work well with some testing, but it is more adventurous than 
> the previous one.

Yes, I think we have enough adventures on emacs-29.