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// PR c++/48451
// { dg-do compile { target c++11 } }
namespace std {
template <class T> T&& declval();
}
template<class T, class... Args,
class = decltype(T(std::declval<Args>()...))
>
char f(int);
struct From2Ints { From2Ints(int, int); };
static_assert(sizeof(f<From2Ints, int, int>(0)) == 1, "Error"); // b
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