59     const std::unique_ptr<int> p2;  in main()  local
60     assert( (p2 == nullptr));  in main()
61     assert( (nullptr == p2));  in main()
62     assert(!(p2 < nullptr));  in main()
63     assert(!(nullptr < p2));  in main()
64     assert( (p2 <= nullptr));  in main()
65     assert( (nullptr <= p2));  in main()
66     assert(!(p2 > nullptr));  in main()
67     assert(!(nullptr > p2));  in main()
68     assert( (p2 >= nullptr));  in main()
69     assert( (nullptr >= p2));  in main()