36     using boost::mp11::mp_valid;  in main()
40     BOOST_TEST_TRAIT_FALSE((mp_valid<mp_identity>));  in main()
41     BOOST_TEST_TRAIT_TRUE((mp_valid<mp_identity, void>));  in main()
42     BOOST_TEST_TRAIT_FALSE((mp_valid<mp_identity, void, void>));  in main()
44     BOOST_TEST_TRAIT_FALSE((mp_valid<X>));  in main()
45     BOOST_TEST_TRAIT_TRUE((mp_valid<X, void>));  in main()
46     BOOST_TEST_TRAIT_FALSE((mp_valid<X, int>));  in main()
47     BOOST_TEST_TRAIT_FALSE((mp_valid<X, void, void>));  in main()
49     BOOST_TEST_TRAIT_FALSE((mp_valid<QX::fn>));  in main()
50     BOOST_TEST_TRAIT_TRUE((mp_valid<QX::fn, void>));  in main()
51     BOOST_TEST_TRAIT_FALSE((mp_valid<QX::fn, int>));  in main()
52     BOOST_TEST_TRAIT_FALSE((mp_valid<QX::fn, void, void>));  in main()
59     BOOST_TEST_TRAIT_FALSE((mp_valid<add_pointer>));  in main()
60     BOOST_TEST_TRAIT_TRUE((mp_valid<add_pointer, void>));  in main()
61     BOOST_TEST_TRAIT_TRUE((mp_valid<add_pointer, int>));  in main()
64     BOOST_TEST_TRAIT_FALSE((mp_valid<add_pointer, int&>));  in main()
66     BOOST_TEST_TRAIT_FALSE((mp_valid<add_pointer, void, void>));  in main()
68     BOOST_TEST_TRAIT_FALSE((mp_valid<Q_add_pointer::fn>));  in main()
69     BOOST_TEST_TRAIT_TRUE((mp_valid<Q_add_pointer::fn, void>));  in main()
70     BOOST_TEST_TRAIT_TRUE((mp_valid<Q_add_pointer::fn, int>));  in main()
71     BOOST_TEST_TRAIT_FALSE((mp_valid<Q_add_pointer::fn, void, void>));  in main()
80     BOOST_TEST_TRAIT_FALSE((mp_valid<add_reference>));  in main()
83     BOOST_TEST_TRAIT_FALSE((mp_valid<add_reference, void>));  in main()
85     BOOST_TEST_TRAIT_TRUE((mp_valid<add_reference, int>));  in main()
86     BOOST_TEST_TRAIT_FALSE((mp_valid<add_reference, int, int>));  in main()
89     BOOST_TEST_TRAIT_FALSE((mp_valid<add_extents>));  in main()
90     BOOST_TEST_TRAIT_TRUE((mp_valid<add_extents, int>));  in main()
93     BOOST_TEST_TRAIT_FALSE((mp_valid<add_extents, void>));  in main()
94     BOOST_TEST_TRAIT_FALSE((mp_valid<add_extents, int&>));  in main()
96     BOOST_TEST_TRAIT_FALSE((mp_valid<add_extents, int, int>));  in main()