bug#74245: 30.0.92; CPerl subroutine signatures are left open when last param is $

[Stefan Kangas]

Peter Oliver <p.d.oliver@mavit.org.uk> writes:

> Perl subroutine signatures can include a variable with no name, just a bare 
> $, to indicate that a parameter should be ignored.  If this happens in the 
> last place, CPerl mode in Emacs 30.0.92 mishandles it, and is unable to see 
> the closing ).  Consequently, it matches parentheses incorrectly, and 
> misindents subsequent blocks.
>
> I have a test that I will send in as a patch, once I have a bug number.
>
> This issue is not present in Emacs 29.4.

Harald, could you please take a look at this?