29     static int alive;  member
31     X() { ++alive; }  in X()
36         ++alive;  in X()
46     ~X() { assert(alive > 0); --alive; }  in ~X()
52 int X::alive = 0;  member in X
100         assert(T::alive == 1);  in main()
102         assert(T::alive == 0);  in main()
136         X::alive = 0;  in main()
140         assert(X::alive == 1);  in main()
153         assert(X::alive == 1);  in main()
155     assert(X::alive == 0);  in main()
161         assert(X::alive == 2);  in main()
174         assert(X::alive == 2);  in main()
176     assert(X::alive == 0);  in main()