package MyAPI::Version::One;
use Moose::Role;

require 'foo';
require 'bar';

package MyAPI::Latest;
use Moose::Role;

with 'MyAPI::Version::One';

##</code><code>##

package MyAPI::Version::Two;
use Moose::Role;
with 'MyAPI::Version::One'; # assuming back-compat
require 'baz';

package MyAPI::Latest;
use Moose::Role;

with 'MyAPI::Version::Two';