https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111690
--- Comment #1 from Fedor Chelnokov <fchelnokov at gmail dot com> ---
This program should be rejected as well due to ambiguity of equality comparison
operator:
```
#include <compare>
struct A {
friend auto operator <=>(const A &, const A &) = default;
friend auto operator <=>(A, A) = default;
};
int main() { return A{} == A{}; }
```
as Clang does, but GCC not. Online demo: https://gcc.godbolt.org/z/o8o68vTWd
