package Foo;
use Role::Tiny::With; with "Foo::Bar";
sub aa {
  my ( $self, $args ) = @_;
  my $val = $self->_aa ( $args->{'bar'} );
}
sub bb {
  my ( $self, $args ) = @_;
  my $val = $self->_bb ( $args->{'foo'} );
}
1;

##</code><code>##

package Foo::Bar;
use Role::Tiny;
sub _aa {
  my $self, $quux ) = @_;
}
sub _bb {
  my $self, $fazoo ) = @_;
}
1;

##</code><code>##

package Foo2;
use Role::Tiny::With; with "Foo::Bar";
...;
1;