48     friend void swap(Y& x, Y& y) {std::swap(x.i_, y.i_);}  in swap()  function
61     friend void swap(Z& x, Z& y) {throw 6;}  in swap()  function
73         static_assert(noexcept(swap(opt1, opt2)) == true, "");  in main()
76         swap(opt1, opt2);  in main()
83         static_assert(noexcept(swap(opt1, opt2)) == true, "");  in main()
87         swap(opt1, opt2);  in main()
95         static_assert(noexcept(swap(opt1, opt2)) == true, "");  in main()
99         swap(opt1, opt2);  in main()
107         static_assert(noexcept(swap(opt1, opt2)) == true, "");  in main()
112         swap(opt1, opt2);  in main()
121         static_assert(noexcept(swap(opt1, opt2)) == true, "");  in main()
124         swap(opt1, opt2);  in main()
132         static_assert(noexcept(swap(opt1, opt2)) == true, "");  in main()
137         swap(opt1, opt2);  in main()
146         static_assert(noexcept(swap(opt1, opt2)) == true, "");  in main()
151         swap(opt1, opt2);  in main()
160         static_assert(noexcept(swap(opt1, opt2)) == true, "");  in main()
166         swap(opt1, opt2);  in main()
176         static_assert(noexcept(swap(opt1, opt2)) == false, "");  in main()
179         swap(opt1, opt2);  in main()
187         static_assert(noexcept(swap(opt1, opt2)) == false, "");  in main()
192         swap(opt1, opt2);  in main()
201         static_assert(noexcept(swap(opt1, opt2)) == false, "");  in main()
206         swap(opt1, opt2);  in main()
215         static_assert(noexcept(swap(opt1, opt2)) == false, "");  in main()
221         swap(opt1, opt2);  in main()
231         static_assert(noexcept(swap(opt1, opt2)) == false, "");  in main()
234         swap(opt1, opt2);  in main()
242         static_assert(noexcept(swap(opt1, opt2)) == false, "");  in main()
248             swap(opt1, opt2);  in main()
263         static_assert(noexcept(swap(opt1, opt2)) == false, "");  in main()
269             swap(opt1, opt2);  in main()
285         static_assert(noexcept(swap(opt1, opt2)) == false, "");  in main()
292             swap(opt1, opt2);  in main()