package BasicRole;

use Moo::Role;

has 'attrib' => ( is => 'ro' );

sub do_something {
   ...
}

1;

package NotSoBasicRole;

use Moo;
extends 'BasicRole';

has '+attrib' => ( default => sub { return 1; } );

1;

package SpecialRole;

use Moo;
extends 'NotSoBasicRole;

has '+attrib' => ( default => sub { return 2; } );

sub do_something_else {
   ...
}
1;