1// PR c++/42623 2// We should choose f(B) because f(A<undef>) involves applying sizeof to 3// an incomplete class, so it is removed by SFINAE. 4// { dg-do link } 5 6struct undef; 7 8template <typename U, int N = sizeof(U)> struct A { A(int); }; 9template <typename U> void f(A<U>); 10 11template <typename U> struct B { B(int) { } }; 12template <typename U> void f(B<U>) { } 13 14int main() 15{ 16 f<undef>(0); 17} 18