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// PR c++/68965 // { dg-do compile { target c++14 } } // { dg-options "-Wall -Wextra" } auto count = [](auto&&... xs) // { dg-warning "unused parameter" } { }; struct count_struct { template<typename... Ts> auto operator()(Ts&&... xs) // { dg-warning "unused parameter" } { } }; int main() { count(1,2,3); count_struct{}(1,2,3); }