120                                convertible_to<char16&> rto_c16,  in test_implicit_conversions()  argument
146   (void)(rto_c16 = to_c16); // expected-error{{no viable overloaded '='}}  in test_implicit_conversions()
147   (void)(rto_c16 += to_c16);  in test_implicit_conversions()
148   (void)(rto_c16 -= to_c16);  in test_implicit_conversions()
149   (void)(rto_c16 *= to_c16);  in test_implicit_conversions()
150   (void)(rto_c16 /= to_c16);  in test_implicit_conversions()
184   (void)(rto_c16 = c16e); // expected-error{{no viable overloaded '='}}  in test_implicit_conversions()
185   (void)(rto_c16 += to_c16e);  in test_implicit_conversions()
186   (void)(rto_c16 -= to_c16e);  in test_implicit_conversions()
187   (void)(rto_c16 *= to_c16e);  in test_implicit_conversions()
188   (void)(rto_c16 /= to_c16e);  in test_implicit_conversions()