Function variant_changed

diffus/src/diffable_impls/option.rs:32–37

()

    #[test]
    fn variant_changed() {
        if let Some(enm::Edit::VariantChanged(&None, &Some(3))) = None.diff(&Some(3)).change() {
        } else {
            unreachable!();
        }
    }

    #[test]
    fn associate_change() {