Moose role with requirement consuming another role

[Boldra]

I want a role to consume another role, and provide an attribute that the consumed role requires, but Moose won't see the attribute provided by the first role.

An example:

package Role::Logger;
use Moose::Role;
requires qw<smeg>;

package Role::App;
use Moose::Role;
has smeg => ( is => 'rw' );
with 'Role::Logger';

package App::FixIt;
use Moose;
with "Role::App";
sub run {
   print "smeg=" . shift->smeg;
}
package main;
use Moose;
App::FixIt->new( { smeg => 1 } )->run;

This code returns the error 'Role::App' requires the method 'smeg' to be implemented by 'App::FixIt'. But Role::App doesn't have any requirements, it's Role::Logger which requires smeg, and smeg is provided by Role::App.

The Moose documentation to required attributes warns that a requirement met by an attribute in a consuming class must be met before the role is consumed, so:

package Role::App;
use Moose::Role;
requires 'gazpacho';

package App::FixIt;
use Moose;
with Role::App;
has gazpacho => ( is => 'rw' );

breaks because the requirement is met after the role is consumed. Here, swapping the order of with and has solves the problem. OTOH, requirement met by a subroutine would also be ok, because the subroutine is defined before with imposes the required constraints at runtime.

In summary: If a role requires a method and the requirement is met by:

a sub in a consuming class	No problem
a sub in a consuming role	No problem
an attribute in a consuming class	be careful of the has/with order
an attribute in a consuming role	can't be done?

Thanks for your thoughts!