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

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> Subject: 
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> Re: bug#26037: 25.1; perl-mode add syntax support for subroutine signatures
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> Date: 
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> Wed, 15 Mar 2017 12:00:32 +0200
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> OK, I see.
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> After a bit of testing with C-u C-x =, I see that with my proposed
> change the sigils in 'sub test ($)' will *not* have punctuation class
> as they did before the chagne.
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> I see these options:
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> 1. I can try to improve the proposed change to preserve backward
> compatibility - I can try to add another rule which will strictly
> match only the allowed prototype-sigils $%&*;@[\]
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> 2. discard my proposed change as it might have undesired side effects -
> at this point, I don't see anything in perl-mode which depends on
> these prototype-sigils having punctioation class, however, I could be
> missing something.
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> 3. accept my proposed change as-is, but we must be sure nothing will
> be broken as a result.  I'm sure syntax highlighting will not be
> broken (I've tested with different themes, different perl sub
> definitions).
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> Please let me know what you think.
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> --- End Message ---

I ran git blame against the relevant lines, and turned up Bug#18502.
Please check if your change breaks the indentation test case at
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18502#5.