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

[Dmitry Gutov]

This is resolved and closed, I just replied to a different subthread.

I suppose you set up some automation for pinging non-respondents? :)

On 16/12/2023 13:58, Eli Zaretskii wrote:
> Ping!
>
> > Cc:67569@debbugs.gnu.org
> > Date: Sat, 09 Dec 2023 10:32:22 +0200
> > From: Eli Zaretskii<eliz@gnu.org>
> >
> > > From: Michael Hoy<mjh@mjhoy.com>
> > > Date: Fri, 01 Dec 2023 09:27:47 -0500
> > >
> > > In the standard ruby-mode, a variable named "index" followed by a "/"
> > > causes the syntax highlighting to break -- it appears that after the
> > > slash everything is interpreted as part of a regular expression until
> > > another "/" appears.
> > >
> > > You can reproduce this fairly easily. using 'emacs -Q', go to the
> > > scratch buffer and clear it. Run 'M-x ruby-mode'. Enter something like
> > > the following:
> > >
> > > def foo
> > >    index = 5
> > >    x = index / 3
> > >    puts "#{x}"
> > > end
> > >
> > > Note that starting after the "/" until the end, syntax highlighting and
> > > indentation break (everything, in my color scheme, is purple). If you
> > > add a "/" for instance to the "puts" line, syntax highlighting and
> > > indentation will be restored after that.
> > >
> > > There is a report here about the bug:
> > > https://emacs.stackexchange.com/questions/23802/division-sometimes-breaks-syntax-highlighting-in-ruby-mode
> > > The author says in the comments they used "M-x report-emacs-bug", but I
> > > couldn't find it (and the comments suggest that it may not have been
> > > sent correctly). Apologies if this is already reported!
> > Dmitry, any comments?