bug#5064: 23.1.50; perl mode coloring gone if subroutine name is one letter long

bug#5064: 23.1.50; perl mode coloring gone if subroutine name is one letter long

[jidanni]

Gentlemen, consider the following perl subroutines.
Notice how the latter has all its coloring gone, just because it starts
with one letter. (perl-mode)^X^E

sub max {
    my $max = shift(@_);
    foreach $foo (@_) {
        $max = $foo if $max < $foo;
    }
    return $max;
}
sub m {
    my $max = shift(@_);
    foreach $foo (@_) {
        $max = $foo if $max < $foo;
    }
    return $max;
}

bug#5064: 23.1.50; perl mode coloring gone if subroutine name is one letter long

[Stefan Monnier]

> Gentlemen, consider the following perl subroutines.
> Notice how the latter has all its coloring gone, just because it starts
> with one letter. (perl-mode)^X^E

> sub max {
>     my $max = shift(@_);
>     foreach $foo (@_) {
>         $max = $foo if $max < $foo;
>     }
>     return $max;
> }
> sub m {
>     my $max = shift(@_);
>     foreach $foo (@_) {
>         $max = $foo if $max < $foo;
>     }
>     return $max;
> }

Actually, the problem is not really that it's only one letter, but that
it's the "keyword" m, used for matching (as in "m/regexp/").  Of course
the same can happen with other keywords like "s", "tr", "y", "q", "qx",
and various others.

I'm not sure if such a function definition is valid.  Does Perl accept
it and can you actually call this function?


        Stefan

bug#5064: marked as done (23.1.50; perl mode coloring gone if subroutine name is one letter long)

[Emacs bug Tracking System]

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Your message dated Sun, 29 Nov 2009 04:23:07 +0800
with message-id <873a3ytn4k.fsf_-_@jidanni.org>
and subject line Bug#558428: mention that perl can't deal with certain one letter subroutines
has caused the Emacs bug report #5064,
regarding 23.1.50; perl mode coloring gone if subroutine name is one letter long
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
5064: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=5064
Emacs Bug Tracking System
Contact owner@emacsbugs.donarmstrong.com with problems

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From: jidanni@jidanni.org
To: emacs-pretest-bug@gnu.org
Subject: 23.1.50; perl mode coloring gone if subroutine name is one letter long
Date: Sat, 28 Nov 2009 09:41:40 +0800
Message-ID: <87ocmn8lyj.fsf@jidanni.org>

Gentlemen, consider the following perl subroutines.
Notice how the latter has all its coloring gone, just because it starts
with one letter. (perl-mode)^X^E

sub max {
    my $max = shift(@_);
    foreach $foo (@_) {
        $max = $foo if $max < $foo;
    }
    return $max;
}
sub m {
    my $max = shift(@_);
    foreach $foo (@_) {
        $max = $foo if $max < $foo;
    }
    return $max;
}


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From: jidanni@jidanni.org
To: submit@bugs.debian.org
Subject: Bug#558428: mention that perl can't deal with certain one letter subroutines
Date: Sun, 29 Nov 2009 04:23:07 +0800
Message-ID: <873a3ytn4k.fsf_-_@jidanni.org>

X-debbugs-cc: 5064-close@emacsbugs.donarmstrong.com, monnier@iro.umontreal.ca
Package: perl-doc
Version: 5.10.1-8
Severity: wishlist
File: /usr/share/man/man1/perlsub.1.gz
Tags: upstream

Dear Perl guys: On the perlsub man page, please mention near:

       Subroutines whose names are in all upper case are reserved to the
       Perl core, as are modules whose names are in all lower case.

that sub m {...}
won't work too.

SM> Actually, the problem is not really that it's only one letter, but that
SM> it's the "keyword" m, used for matching (as in "m/regexp/").  Of course
SM> the same can happen with other keywords like "s", "tr", "y", "q", "qx",
SM> and various others.