70 Ambiguous erf(Ambiguous){ return Ambiguous(); }  in erf()  function
854     static_assert((std::is_same<decltype(erf((float)0)), float>::value), "");  in test_erf()
855     static_assert((std::is_same<decltype(erf((bool)0)), double>::value), "");  in test_erf()
856     static_assert((std::is_same<decltype(erf((unsigned short)0)), double>::value), "");  in test_erf()
857     static_assert((std::is_same<decltype(erf((int)0)), double>::value), "");  in test_erf()
858     static_assert((std::is_same<decltype(erf((unsigned int)0)), double>::value), "");  in test_erf()
859     static_assert((std::is_same<decltype(erf((long)0)), double>::value), "");  in test_erf()
860     static_assert((std::is_same<decltype(erf((unsigned long)0)), double>::value), "");  in test_erf()
861     static_assert((std::is_same<decltype(erf((long long)0)), double>::value), "");  in test_erf()
862     static_assert((std::is_same<decltype(erf((unsigned long long)0)), double>::value), "");  in test_erf()
863     static_assert((std::is_same<decltype(erf((double)0)), double>::value), "");  in test_erf()
864     static_assert((std::is_same<decltype(erf((long double)0)), long double>::value), "");  in test_erf()
867     static_assert((std::is_same<decltype(erf(Ambiguous())), Ambiguous>::value), "");  in test_erf()
868     assert(erf(0) == 0);  in test_erf()