// { dg-do compile { target c++20 } } namespace std { int strong_ordering; struct partial_ordering { static int equivalent (); }; } auto a = 1 <=> 2; // { dg-error "'std::strong_ordering' is not a type" } // { dg-message "forming type of 'operator<=>'" "" { target *-*-* } .-1 } auto b = 3.0 <=> 4.0; // { dg-error "'std::partial_ordering::equivalent\\(\\)' is not a static data member" } // { dg-message "determining value of 'operator<=>'" "" { target *-*-* } .-1 }