Internal Program Version: Moo  2.005005.5.42.0

'Moo' is an extremely light-weight Object Orientation system. It allows one
to concisely define objects and roles with a convenient syntax that avoids
the details of Perl's object system. 'Moo' contains a subset of Moose and
is optimised for rapid startup.

http://search.cpan.org/dist/Moo