package Moose::Exception::AttributeMustBeAnClassMOPMixinAttributeCoreOrSubclass; our $VERSION = '2.2011'; use Moose; extends 'Moose::Exception'; with 'Moose::Exception::Role::Class'; has 'attribute' => ( is => 'ro', isa => 'Any', required => 1 ); sub _build_message { "Your attribute must be an instance of Class::MOP::Mixin::AttributeCore (or a subclass)"; } __PACKAGE__->meta->make_immutable; 1;