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// PR c++/48557
// { dg-options -std=c++0x }
template<class T>
struct add_rval_ref
{
typedef T&& type;
};
template<>
struct add_rval_ref<void>
{
typedef void type;
};
template<class T>
typename add_rval_ref<T>::type create();
template<class T, class U,
class = decltype(create<T>() + create<U>())
>
char f(int);
template<class, class>
char (&f(...))[2];
static_assert(sizeof(f<void, int>(0)) != 1, "Error"); // (a)
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