24 using std::optional;
56 constexpr bool assign_empty(optional<Tp>&& lhs) {  in assign_empty()
57     optional<Tp> rhs;  in assign_empty()
63 constexpr bool assign_value(optional<Tp>&& lhs) {  in assign_value()
64     optional<Tp> rhs(101);  in assign_value()
72         static_assert(std::is_nothrow_move_assignable<optional<int>>::value, "");  in main()
73         optional<int> opt;  in main()
74         constexpr optional<int> opt2;  in main()
80         optional<int> opt;  in main()
81         constexpr optional<int> opt2(2);  in main()
89         optional<int> opt(3);  in main()
90         constexpr optional<int> opt2;  in main()
98         optional<T> opt(3);  in main()
99         optional<T> opt2;  in main()
107         optional<int> opt(3);  in main()
108         constexpr optional<int> opt2(2);  in main()
116         using O = optional<int>;  in main()
125         using O = optional<TrivialTestTypes::TestType>;  in main()
135         static_assert(!std::is_nothrow_move_assignable<optional<X>>::value, "");  in main()
138         optional<X> opt;  in main()
139         optional<X> opt2(X{});  in main()
157         static_assert(!std::is_nothrow_move_assignable<optional<X>>::value, "");  in main()
159         optional<X> opt(X{});  in main()
160         optional<X> opt2(X{});  in main()
179         static_assert(std::is_nothrow_move_assignable<optional<Y>>::value, "");  in main()
189         static_assert(!std::is_nothrow_move_assignable<optional<ThrowsMove>>::value, "");  in main()
197         static_assert(!std::is_nothrow_move_assignable<optional<ThrowsMoveAssign>>::value, "");  in main()
205         static_assert(std::is_nothrow_move_assignable<optional<NoThrowMove>>::value, "");  in main()