1 // PR c++/83644 2 // { dg-do compile { target c++17 } } 3 4 namespace std { 5 template <typename> bool is_invocable_v; 6 } compose(F)7 template <typename F> auto compose(F) { 8 [](auto... objs) noexcept(std::is_invocable_v<decltype(objs)...>){}; 9 } 10 f()11 auto f() { compose(3); } 12