'Moose::Meta::TypeConstraint::Class' =>
[qw( equals is_a_type_of is_a_subtype_of )],
'Moose::Meta::TypeConstraint::Enum' => [qw( constraint equals )],
+ 'Moose::Meta::TypeConstraint::DuckType' => [qw( constraint equals get_message )],
'Moose::Meta::TypeConstraint::Parameterizable' => ['.+'],
'Moose::Meta::TypeConstraint::Parameterized' => ['.+'],
'Moose::Meta::TypeConstraint::Role' => [qw( equals is_a_type_of )],