2 // We should choose f(B) because f(A<undef>) involves applying sizeof to
3 // an incomplete class, so it is removed by SFINAE.
8 template <typename U, int N = sizeof(U)> struct A { A(int); };
9 template <typename U> void f(A<U>);
11 template <typename U> struct B { B(int) { } };
12 template <typename U> void f(B<U>) { }