1 // PR c++/68377 2 // { dg-options -std=c++17 } 3 4 struct Sink { } s; 5 template <class T> Sink& operator<<(Sink&, const T&); 6 7 template<class... Tx> f(Tx...xs)8 int f(Tx... xs) { 9 return ((xs+1) + ...); 10 } 11 main()12 int main() { 13 s << f(3,4,5) << "\n"; 14 return 0; 15 } 16