1 // PR c++/48451 2 // { dg-do compile { target c++11 } } 3 4 namespace std { 5 template <class T> T&& declval(); 6 } 7 8 template<class T, class... Args, 9 class = decltype(T(std::declval<Args>()...)) 10 > 11 char f(int); 12 13 struct From2Ints { From2Ints(int, int); }; 14 15 static_assert(sizeof(f<From2Ints, int, int>(0)) == 1, "Error"); // b 16