74         constexpr optional<int> opt2;  in main()  local
75         opt = std::move(opt2);  in main()
76         static_assert(static_cast<bool>(opt2) == false, "");  in main()
77         assert(static_cast<bool>(opt) == static_cast<bool>(opt2));  in main()
81         constexpr optional<int> opt2(2);  in main()  local
82         opt = std::move(opt2);  in main()
83         static_assert(static_cast<bool>(opt2) == true, "");  in main()
84         static_assert(*opt2 == 2, "");  in main()
85         assert(static_cast<bool>(opt) == static_cast<bool>(opt2));  in main()
86         assert(*opt == *opt2);  in main()
90         constexpr optional<int> opt2;  in main()  local
91         opt = std::move(opt2);  in main()
92         static_assert(static_cast<bool>(opt2) == false, "");  in main()
93         assert(static_cast<bool>(opt) == static_cast<bool>(opt2));  in main()
99         optional<T> opt2;  in main()  local
101         opt = std::move(opt2);  in main()
103         assert(static_cast<bool>(opt2) == false);  in main()
104         assert(static_cast<bool>(opt) == static_cast<bool>(opt2));  in main()
108         constexpr optional<int> opt2(2);  in main()  local
109         opt = std::move(opt2);  in main()
110         static_assert(static_cast<bool>(opt2) == true, "");  in main()
111         static_assert(*opt2 == 2, "");  in main()
112         assert(static_cast<bool>(opt) == static_cast<bool>(opt2));  in main()
113         assert(*opt == *opt2);  in main()
139         optional<X> opt2(X{});  in main()  local
141         assert(static_cast<bool>(opt2) == true);  in main()
145             opt = std::move(opt2);  in main()
160         optional<X> opt2(X{});  in main()  local
162         assert(static_cast<bool>(opt2) == true);  in main()
166             opt = std::move(opt2);  in main()