And, as a further guess, the way $self->{ABSTRACT} is assigned its value, has something to do with it.

It's all very strange.
I, in fact, did get to wonder whether the change was in the assignment of $self->{ABSTRACT}, and *not* in the behaviour of $self->{ABSTRACT} =~ m![[:cntrl:]]+!
However, I didn't really look at how the former was being assigned.

If I could reproduce the issue I reckon I'd be wanting to understand it.
But I can't reproduce it ... so it's really not all that important to me. (I guess I just find it "intriguing" rather than "important".)

To satisfy my own curiosity, I fiddled about with the following script, on both Linux and Windows: 
use strict;
use warnings;

my $count = 0;

for my $s(chr(13) . chr(10),
          chr(10) . chr(13),
          chr(10)          ,
          chr(13)          ,
          '0' . chr(13) . chr(10),
          '0' . chr(10) . chr(13),
          '0' . chr(10)          ,
          '0' . chr(13)          , ) {

    $count++;  
    print "$count match\n" if ($s && $s =~ m![[:cntrl:]]+!);
}

[download]
But it just outputs: 
1 match
2 match
3 match
4 match
5 match
6 match
7 match
8 match

[download]
on every perl I run it on.
So I don't understand how a lone \r is being treated differently to a lone \n or \r\n in some cases for you.

Cheers,
Rob

In reply to Re^5: 'perl Makefile.PL' warning for v5.20 to v5.24 by syphilis
in thread 'perl Makefile.PL' warning for v5.20 to v5.24 by kcott

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