mrdocs::Expected::emplace

template<class... Args>
requires std::is_nothrow_constructible_v<T, Args...>
constexpr
T&
emplace(Args&&... args) noexcept;

template<
    class U,
    class... Args>
requires std::is_nothrow_constructible_v<
            T, std::initializer_list<U>&, Args...>
constexpr
T&
emplace(
    std::initializer_list<U> il,
    Args&&... args) noexcept;