68 Ambiguous acosh(Ambiguous){ return Ambiguous(); }  in acosh()  function
793     static_assert((std::is_same<decltype(std::acosh((float)0)), float>::value), "");  in test_acosh()
794     static_assert((std::is_same<decltype(std::acosh((bool)0)), double>::value), "");  in test_acosh()
795     static_assert((std::is_same<decltype(std::acosh((unsigned short)0)), double>::value), "");  in test_acosh()
796     static_assert((std::is_same<decltype(std::acosh((int)0)), double>::value), "");  in test_acosh()
797     static_assert((std::is_same<decltype(std::acosh((unsigned int)0)), double>::value), "");  in test_acosh()
798     static_assert((std::is_same<decltype(std::acosh((long)0)), double>::value), "");  in test_acosh()
799     static_assert((std::is_same<decltype(std::acosh((unsigned long)0)), double>::value), "");  in test_acosh()
800     static_assert((std::is_same<decltype(std::acosh((long long)0)), double>::value), "");  in test_acosh()
801     static_assert((std::is_same<decltype(std::acosh((unsigned long long)0)), double>::value), "");  in test_acosh()
802     static_assert((std::is_same<decltype(std::acosh((double)0)), double>::value), "");  in test_acosh()
803     static_assert((std::is_same<decltype(std::acosh((long double)0)), long double>::value), "");  in test_acosh()
806     static_assert((std::is_same<decltype(acosh(Ambiguous())), Ambiguous>::value), "");  in test_acosh()
807     assert(std::acosh(1) == 0);  in test_acosh()