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// PR c++/56611
// { dg-do compile { target c++11 } }
template<class T> struct remove_reference { typedef T type; };
template<class T> struct remove_reference<T&> { typedef T type; };
template<class T> T declval() { return T(); }
int f(int, int){return 0;}
struct Func{};
template<class... Args> using result2
= decltype(f(declval<typename remove_reference<Args>::type>()...));
template<class Sig> struct R;
template<class This, class... Args> struct R< This(Args...) >
{
typedef result2<Args...> type;
};
typedef R< Func(int, int) >::type R_type;
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