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// PR c++/59730
// { dg-do compile { target c++11 } }
template <typename> void declval();
template <typename> void forward();
template <typename> class D;
template <typename _Functor, typename... _Bound_args>
class D <_Functor(_Bound_args...)> {
template <typename... _Args, decltype(declval<_Functor>)>
void operator()(...) {
0(forward<_Args>...);
}
};
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