Method instance

gi/arg-cache.h:278–284

    }

    [[nodiscard]]
    constexpr mozilla::Maybe<Argument*> instance() const {
        if (!m_is_method)
            return {};

        return mozilla::Some(arg_get<Arg::Kind::INSTANCE>().get());
    }

    [[nodiscard]]
    constexpr mozilla::Maybe<Argument*> return_value() const {