e>;    template<typename _Value,     typename _Hash = hash<_Value>,     typename _Pred = std::equal_to<_Value>,       typename _Alloc = std::allocator<_Value>,     typename _Tr = __uset_traits<__cache_default<_Value, _Hash>::value>>     using __uset_hashtable = _Hashtable<_Value, _Value, _Alloc,      