perlfilter.pod: Retain entry in customized database

pod/perlfilter.pod is (for historical reasons, apparently) maintained
upstream on CPAN as part of the Filter distribution.  As such, (i) it
should, generally speaking, only be edited upstream and synched into
core; (ii) needs to be referenced in several places in the
Filter::Util::Call element in %Maintainers::Modules
(Porting/Maintainers.pl); (iii) needs to have an entry in
t/porting/customized.dat (the "customized database") to protect it from
being "overwritten" or accidentally removed.

For all of the above conditions to work together, the
filter_customized() subroutine in t/porting/customized.t needs to be
able to construct a regex which recognizes pod/perlfilter.pod's
weirdness.  Prior to this patch it was failing to do so.  Thus when
pod/perlfilter.pod was accidentally edited in commit d84bd0bd47, the
need to regenerate the customized database was not recognized.  Later,
review of a different pull request which required regeneration of the
customized database spotted the unintentional deletion of the entry for
pod/perlfilter.pod from t/porting/customized.dat.

Addressing this problem is inevitably going to be kludgy, but it will be
less kludgy if done in t/porting/customized.t than in
Porting/Maintainers.pl.  This patch modifies the former file to
guarantee that the string 'pod/perlfilter.pod' is matched.  After that
modification, 'cd t; ./perl -I../lib porting/customized.t --regen; cd -'
was run.  This accomplished the (previously overlooked) removal of
certain entries for Memoize in the customized database while leaving the
entry for pod/perlfilter.pod in that database intact.

If at some point in the future we decide that pod/perlfilter.pod should
be maintained directly in core, we can remove this kludge and simplify
the Filter::Util::Call element in %Maintainers::Modules in
Porting/Maintainers.pl.

For: https://github.com/Perl/perl5/issues/20228.

Should (partially) unblock https://github.com/Perl/perl5/pull/20216.

2 files changed, 6 insertions, 8 deletions

diff --git a/t/porting/customized.dat b/t/porting/customized.dat
index dae5af2446..e5fdac9850 100644
--- a/t/porting/customized.dat
+++ b/t/porting/customized.dat
@@ -10,11 +10,6 @@ Math::Complex cpan/Math-Complex/lib/Math/Complex.pm 66f28a17647e2de166909ca66e4c
 Math::Complex cpan/Math-Complex/t/Complex.t 17039e03ee798539e770ea9a0d19a99364278306
 Math::Complex cpan/Math-Complex/t/Trig.t 508f8e27373c08228be13ca5d42b28812ab0e020
 Math::Complex cpan/Math-Complex/t/underbar.t 97e7b9615658eefc67a710d4b258349cc5bace63
-Memoize cpan/Memoize/Memoize.pm 902092ff91cdec9c7b4bd06202eb179e1ce26ca2
-Memoize cpan/Memoize/t/errors.t bcd0c02a4bc47dfda07a97d265d7210849871659
-Memoize cpan/Memoize/t/expmod_t.t a1c3d03fd3ec2e7c6c835f02316475756e1b16b7
-Memoize cpan/Memoize/t/speed.t 89fe8c8928f0164c9ed898b5a427dbbc814e9976
-Memoize cpan/Memoize/t/tie_gdbm.t d81c4f6208f6c925539b3878bff9a8ff1b73a37e
 Net::Ping dist/Net-Ping/t/000_load.t deff5dc2ca54dae28cb19d3631427db127279ac2
 Net::Ping dist/Net-Ping/t/001_new.t 7b24e05672e22edfe3e6b5cc0277f815efe557e5
 Net::Ping dist/Net-Ping/t/010_pingecho.t 218d7a9ee5b6d03ba2544210acaf6585f8dc5503
diff --git a/t/porting/customized.t b/t/porting/customized.t
index d425e5b775..d0d426f352 100644
--- a/t/porting/customized.t
+++ b/t/porting/customized.t
@@ -28,9 +28,12 @@ sub filter_customized {
     return @files
         unless my $customized = $Modules{$m}{CUSTOMIZED};
 
-    my ($pat) = map { qr/$_/ } join '|' => map {
-        ref $_ ? $_ : qr/\b\Q$_\E$/
-    } @{ $customized };
+    my ($pat) = map { qr/$_/ }
+        join ( '|' =>
+            map { ref $_ ? $_ : qr/\b\Q$_\E$/ } @{ $customized },
+            # https://github.com/Perl/perl5/issues/20228
+            qr/pod\/perlfilter\.pod/
+        );
 
     return grep { $_ =~ $pat } @files;
 }