bug#70948: 29.3; cperl mode hangs on comments like "#___"

[Patrick Goldmann <patrick.goldmann@gmail.com>]

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This was bugging me, so I played around with it a bit more.

It seems this has nothing to do at all with version control etc, but with
the number of underscores.

I could reproduce it on my private machine with a clean emacs 29.3 install
by:
- C-x C-f foo.pl
- M-x cperl-mode
- just keeping underscore pressed

Emacs will slow down eventually and then hang. Haven't waited long enough
to see if it recovers.

Hope this helps.

On Tue, May 14, 2024 at 8:46 PM Patrick Goldmann <patrick.goldmann@gmail.com>
wrote:

> Just got home and tried to reproduce this on my private machine, it worked
> just fine.
>
> So I guess this is something on my work machine, maybe version control
> related or something.
> Still strange this happened while running emacs -Q.
>
> I can try your file tomorrow, but my guess is if I drop this into one of
> my project directories it won't work.
> I'll try it outside of version controlled directories, too, and provide an
> example file.
>
> But if it turns out this is somehow related to version control or
> something else in my project tree, this will be hard to debug and might not
> even be directly related to cperl-mode at all :(
>
> On Tue, May 14, 2024 at 8:20 PM Harald Jörg <haj@posteo.de> wrote:
>
>> Patrick Goldmann <patrick.goldmann@gmail.com> writes:
>>
>> > While trying to open files (with cperl-mode, perl-mode works)
>> > containing comments of this sort, emacs hangs.
>>
>> Unfortunately I can not reproduce this.  I tried on Windows with exactly
>> the same Emacs version with the attached file, and it works as expected.
>>
>> Can you pleas try this file, and provide a file where Emacs hanvs?
>> --
>> Cheers,
>> haj
>>
>>

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