bug#26037: 25.1; perl-mode add syntax support for subroutine signatures

[npostavs]

Евгени Колев <evgenysw@gmail.com> writes:

> The regex is now updated to include all the chars $%&*;@[\]
>
> I got the list of chars from here
> http://perldoc.perl.org/perlsub.html#Prototypes

It looks like "+" is another possible character:

    The + prototype is a special alternative to $ that will act like
    \[@%] when given a literal array or hash variable, but will
    otherwise force scalar context on the argument. This is useful for
    functions which should accept either a literal array or an array
    reference as the argument:

            sub mypush (+@) {

>
> This is the diff, please let me if it can be improved:
>

> ;; Funny things in `sub' arg-specs like `sub myfun ($)' or `sub ($)'.
> ;; Be careful not to match "sub { (...) ... }".
> - ("\\<sub\\(?:[\s\t\n]+\\(?:\\sw\\|\\s_\\)+\\)?[\s\t\n]*(\\([^)]+\\))"
> + 
> ("\\<sub\\(?:[\s\t\n]+\\(?:\\sw\\|\\s_\\)+\\)?[\s\t\n]*(\\([][$%&*;@\\]+\\))"

Please update the comment too.

And if it's not too much trouble could you add a commit message as
described in CONTRIBUTE?  (And then post the output from 'git
format-patch' instead of 'git diff')