alef 0.76.0

    if let Err(error) = with_handle_mut::<{{ opaque_name }}, _>(owner, |service| {
        match service.inner.as_mut() {
            Some(owner_ref) => owner_ref.{{ method_name }}({{ meta_args }}handler),
            None => return,
        }
    }) {
        set_handle_error(&error);
        return 1;
    }
    0