{
    package Foo::Bar;
    use Moose::Role;
 
    requires 'foo';
    requires 'bar';
 
    package Foo::Baz;
    use Moose;
 
    sub foo { 'Foo::Baz::FOO' }
    sub bar { 'Foo::Baz::BAR' }
    sub baz { 'Foo::Baz::BAZ' }
 
    package Foo::Thing;
    use Moose;
 
    has 'thing' => (
        is      => 'rw',
        isa     => 'Foo::Baz',
        handles => 'Foo::Bar',
    );
 
    package Foo::OtherThing;
    use Moose;
    use Moose::Util::TypeConstraints;
 
    has 'other_thing' => (
        is      => 'rw',
        isa     => 'Foo::Baz',
        handles => Moose::Util::TypeConstraints::find_type_constraint('Foo::Bar'),
    );
}