I.. I have no idea what to even call this

[karenetheridge]

the original report: http://www.cpantesters.org/cpan/report/41acd3f2-238d-11e4-9431-1786c7ccabfc

@haarg boiled this down to:

use strict;
use warnings FATAL => 'all';

use Package::Stash::XS;
unshift @INC, sub {
  "a" =~ /a/;
  return;
};

Package::Stash::XS->new("abc::def");

[doy]

This is called "regular expression matching is not reentrant in 5.8". I'm not particularly interested in trying to solve this myself, but if anyone has any non-insane patches, I'd be willing to look at them.

[doy]

See also: https://rt.cpan.org/Public/Bug/Display.html?id=74151

[haarg]

The modules getting loaded, causing the @INC hook to be triggered, are utf8.pm and utf8_heavy.pl. Could _is_valid_module_name either avoid using UTF8, or preload the modules?

[ribasushi]

@haarg it seems "the cabal" has perms for this, can it ship somehow...?