I can't find it now, but IIRC, there is a tarball (or github repository) or the moose cookbook examples, so I would look for it, to see the file-layout

This works

BEGIN {
    package MyApp::Meta::Class::Trait::HasTable;
    use Moose::Role;
    has table => (
      is  => 'rw',
      isa => 'Str',
    );
    package Moose::Meta::Class::Custom::Trait::HasTable;
    sub register_implementation {
'MyApp::Meta::Class::Trait::HasTable' }
}
package MyApp::User;
use Moose -traits => 'HasTable';
__PACKAGE__->meta->table('User');
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