57     class unexpected;  variable
59   unexpected(E) -> unexpected<E>;
90   using unexpected_type = unexpected<E>;
117     else var_ = unexpected(rhs.error());  in expected()
136     else var_ = unexpected(rhs.error());  in expected()
156     else var_ = unexpected(std::move(rhs.error()));  in expected()
175     else var_ = unexpected(std::move(rhs.error()));  in expected()
182                 !std::is_same_v<unexpected<E>, std::remove_cv_t<std::remove_reference_t<U>>> &&
192                 !std::is_same_v<unexpected<E>, std::remove_cv_t<std::remove_reference_t<U>>> &&
203   constexpr expected(const unexpected<G>& e)  in expected()
210   constexpr explicit expected(const unexpected<G>& e)  in expected()
218   constexpr expected(unexpected<G>&& e)  in expected()
225   constexpr explicit expected(unexpected<G>&& e)  in expected()
280   expected& operator=(const unexpected<G>& rhs) {
289   expected& operator=(unexpected<G>&& rhs) {
373   friend constexpr bool operator==(const expected<T1, E1>&, const unexpected<E2>&);
375   friend constexpr bool operator==(const unexpected<E2>&, const expected<T1, E1>&);
377   friend constexpr bool operator!=(const expected<T1, E1>&, const unexpected<E2>&);
379   friend constexpr bool operator!=(const unexpected<E2>&, const expected<T1, E1>&);
403 constexpr bool operator==(const expected<T1, E1>& x, const unexpected<E2>& y) {
407 constexpr bool operator==(const unexpected<E2>& x, const expected<T1, E1>& y) {
411 constexpr bool operator!=(const expected<T1, E1>& x, const unexpected<E2>& y) {
415 constexpr bool operator!=(const unexpected<E2>& x, const expected<T1, E1>& y) {
424   using unexpected_type = unexpected<E>;
437     if (!rhs.has_value()) var_ = unexpected(rhs.error());  in expected()
445     if (!rhs.has_value()) var_ = unexpected(rhs.error());  in expected()
454     if (!rhs.has_value()) var_ = unexpected(std::move(rhs.error()));  in expected()
462     if (!rhs.has_value()) var_ = unexpected(std::move(rhs.error()));  in expected()
470   constexpr expected(const unexpected<G>& e)  in expected()
477   constexpr explicit expected(const unexpected<G>& e)  in expected()
485   constexpr expected(unexpected<G>&& e)  in expected()
492   constexpr explicit expected(unexpected<G>&& e)  in expected()
528   expected& operator=(const unexpected<G>& rhs) {
537   expected& operator=(unexpected<G>&& rhs) {
601 class unexpected {
604   constexpr unexpected(const unexpected&) = default;
605   constexpr unexpected(unexpected&&) noexcept(std::is_nothrow_move_constructible_v<E>) = default;
610                 !std::is_same_v<std::remove_cv_t<std::remove_reference_t<E>>, unexpected>)>
612   constexpr unexpected(Err&& e) : val_(std::forward<Err>(e)) {}  in unexpected()  function
617   constexpr explicit unexpected(std::in_place_t, std::initializer_list<U> il, Args&&... args)  in unexpected()  function
622     !std::is_constructible_v<E, unexpected<Err>&> &&
623     !std::is_constructible_v<E, unexpected<Err>> &&
624     !std::is_constructible_v<E, const unexpected<Err>&> &&
625     !std::is_constructible_v<E, const unexpected<Err>> &&
626     !std::is_convertible_v<unexpected<Err>&, E> &&
627     !std::is_convertible_v<unexpected<Err>, E> &&
628     !std::is_convertible_v<const unexpected<Err>&, E> &&
629     !std::is_convertible_v<const unexpected<Err>, E> &&
633   constexpr unexpected(const unexpected<Err>& rhs)  in unexpected()  function
638     !std::is_constructible_v<E, unexpected<Err>&> &&
639     !std::is_constructible_v<E, unexpected<Err>> &&
640     !std::is_constructible_v<E, const unexpected<Err>&> &&
641     !std::is_constructible_v<E, const unexpected<Err>> &&
642     !std::is_convertible_v<unexpected<Err>&, E> &&
643     !std::is_convertible_v<unexpected<Err>, E> &&
644     !std::is_convertible_v<const unexpected<Err>&, E> &&
645     !std::is_convertible_v<const unexpected<Err>, E> &&
648   constexpr explicit unexpected(const unexpected<Err>& rhs)  in unexpected()  function
653     !std::is_constructible_v<E, unexpected<Err>&> &&
654     !std::is_constructible_v<E, unexpected<Err>> &&
655     !std::is_constructible_v<E, const unexpected<Err>&> &&
656     !std::is_constructible_v<E, const unexpected<Err>> &&
657     !std::is_convertible_v<unexpected<Err>&, E> &&
658     !std::is_convertible_v<unexpected<Err>, E> &&
659     !std::is_convertible_v<const unexpected<Err>&, E> &&
660     !std::is_convertible_v<const unexpected<Err>, E> &&
664   constexpr unexpected(unexpected<Err>&& rhs)  in unexpected()  function
669     !std::is_constructible_v<E, unexpected<Err>&> &&
670     !std::is_constructible_v<E, unexpected<Err>> &&
671     !std::is_constructible_v<E, const unexpected<Err>&> &&
672     !std::is_constructible_v<E, const unexpected<Err>> &&
673     !std::is_convertible_v<unexpected<Err>&, E> &&
674     !std::is_convertible_v<unexpected<Err>, E> &&
675     !std::is_convertible_v<const unexpected<Err>&, E> &&
676     !std::is_convertible_v<const unexpected<Err>, E> &&
679   constexpr explicit unexpected(unexpected<Err>&& rhs)  in unexpected()  function
683   constexpr unexpected& operator=(const unexpected&) = default;
684   constexpr unexpected& operator=(unexpected&&) noexcept(std::is_nothrow_move_assignable_v<E>) =
687   constexpr unexpected& operator=(const unexpected<Err>& rhs) {
692   constexpr unexpected& operator=(unexpected<Err>&& rhs) {
703   void swap(unexpected& other) noexcept(std::is_nothrow_swappable_v<E>) {  in swap()
709   operator==(const unexpected<E1>& e1, const unexpected<E2>& e2);
712   operator!=(const unexpected<E1>& e1, const unexpected<E2>& e2);
715   friend void swap(unexpected<E1>& x, unexpected<E1>& y) noexcept(noexcept(x.swap(y)));
723 operator==(const unexpected<E1>& e1, const unexpected<E2>& e2) {
729 operator!=(const unexpected<E1>& e1, const unexpected<E2>& e2) {
734 void swap(unexpected<E1>& x, unexpected<E1>& y) noexcept(noexcept(x.swap(y))) {  in swap()