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) {
372   friend constexpr bool operator==(const expected<T1, E1>&, const unexpected<E2>&);
374   friend constexpr bool operator==(const unexpected<E2>&, const expected<T1, E1>&);
376   friend constexpr bool operator!=(const expected<T1, E1>&, const unexpected<E2>&);
378   friend constexpr bool operator!=(const unexpected<E2>&, const expected<T1, E1>&);
402 constexpr bool operator==(const expected<T1, E1>& x, const unexpected<E2>& y) {
406 constexpr bool operator==(const unexpected<E2>& x, const expected<T1, E1>& y) {
410 constexpr bool operator!=(const expected<T1, E1>& x, const unexpected<E2>& y) {
414 constexpr bool operator!=(const unexpected<E2>& x, const expected<T1, E1>& y) {
428   using unexpected_type = unexpected<E>;
441     if (!rhs.has_value()) var_ = unexpected(rhs.error());  in expected()
449     if (!rhs.has_value()) var_ = unexpected(rhs.error());  in expected()
458     if (!rhs.has_value()) var_ = unexpected(std::move(rhs.error()));  in expected()
466     if (!rhs.has_value()) var_ = unexpected(std::move(rhs.error()));  in expected()
474   constexpr expected(const unexpected<G>& e)  in expected()
481   constexpr explicit expected(const unexpected<G>& e)  in expected()
489   constexpr expected(unexpected<G>&& e)  in expected()
496   constexpr explicit expected(unexpected<G>&& e)  in expected()
532   expected& operator=(const unexpected<G>& rhs) {
541   expected& operator=(unexpected<G>&& rhs) {
604 class unexpected {
607   constexpr unexpected(const unexpected&) = default;
608   constexpr unexpected(unexpected&&) noexcept(std::is_nothrow_move_constructible_v<E>) = default;
613                 !std::is_same_v<std::remove_cv_t<std::remove_reference_t<E>>, unexpected>)>
615   constexpr unexpected(Err&& e) : val_(std::forward<Err>(e)) {}  in unexpected()  function
620   constexpr explicit unexpected(std::in_place_t, std::initializer_list<U> il, Args&&... args)  in unexpected()  function
625     !std::is_constructible_v<E, unexpected<Err>&> &&
626     !std::is_constructible_v<E, unexpected<Err>> &&
627     !std::is_constructible_v<E, const unexpected<Err>&> &&
628     !std::is_constructible_v<E, const unexpected<Err>> &&
629     !std::is_convertible_v<unexpected<Err>&, E> &&
630     !std::is_convertible_v<unexpected<Err>, E> &&
631     !std::is_convertible_v<const unexpected<Err>&, E> &&
632     !std::is_convertible_v<const unexpected<Err>, E> &&
636   constexpr unexpected(const unexpected<Err>& rhs)  in unexpected()  function
641     !std::is_constructible_v<E, unexpected<Err>&> &&
642     !std::is_constructible_v<E, unexpected<Err>> &&
643     !std::is_constructible_v<E, const unexpected<Err>&> &&
644     !std::is_constructible_v<E, const unexpected<Err>> &&
645     !std::is_convertible_v<unexpected<Err>&, E> &&
646     !std::is_convertible_v<unexpected<Err>, E> &&
647     !std::is_convertible_v<const unexpected<Err>&, E> &&
648     !std::is_convertible_v<const unexpected<Err>, E> &&
651   constexpr explicit unexpected(const unexpected<Err>& rhs)  in unexpected()  function
656     !std::is_constructible_v<E, unexpected<Err>&> &&
657     !std::is_constructible_v<E, unexpected<Err>> &&
658     !std::is_constructible_v<E, const unexpected<Err>&> &&
659     !std::is_constructible_v<E, const unexpected<Err>> &&
660     !std::is_convertible_v<unexpected<Err>&, E> &&
661     !std::is_convertible_v<unexpected<Err>, E> &&
662     !std::is_convertible_v<const unexpected<Err>&, E> &&
663     !std::is_convertible_v<const unexpected<Err>, E> &&
667   constexpr unexpected(unexpected<Err>&& rhs)  in unexpected()  function
672     !std::is_constructible_v<E, unexpected<Err>&> &&
673     !std::is_constructible_v<E, unexpected<Err>> &&
674     !std::is_constructible_v<E, const unexpected<Err>&> &&
675     !std::is_constructible_v<E, const unexpected<Err>> &&
676     !std::is_convertible_v<unexpected<Err>&, E> &&
677     !std::is_convertible_v<unexpected<Err>, E> &&
678     !std::is_convertible_v<const unexpected<Err>&, E> &&
679     !std::is_convertible_v<const unexpected<Err>, E> &&
682   constexpr explicit unexpected(unexpected<Err>&& rhs)  in unexpected()  function
686   constexpr unexpected& operator=(const unexpected&) = default;
687   constexpr unexpected& operator=(unexpected&&) noexcept(std::is_nothrow_move_assignable_v<E>) =
690   constexpr unexpected& operator=(const unexpected<Err>& rhs) {
695   constexpr unexpected& operator=(unexpected<Err>&& rhs) {
706   void swap(unexpected& other) noexcept(std::is_nothrow_swappable_v<E>) {  in swap()
712   operator==(const unexpected<E1>& e1, const unexpected<E2>& e2);
715   operator!=(const unexpected<E1>& e1, const unexpected<E2>& e2);
718   friend void swap(unexpected<E1>& x, unexpected<E1>& y) noexcept(noexcept(x.swap(y)));
726 operator==(const unexpected<E1>& e1, const unexpected<E2>& e2) {
732 operator!=(const unexpected<E1>& e1, const unexpected<E2>& e2) {
737 void swap(unexpected<E1>& x, unexpected<E1>& y) noexcept(noexcept(x.swap(y))) {  in swap()