2 // { dg-do compile { target c++14 } }
3 // { dg-options "-Wall" }
6 template <typename ...Xs>
7 void operator()(Xs&& ...) const { }
9 constexpr function_t function{};
12 constexpr auto fun = ::function;
13 auto call = [=](auto ...x) { fun(x...); };