[Bug c++/93675] New: Starship operator on a hidden friend operator does not work

[mateusz.pusz at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93675

            Bug ID: 93675
           Summary: Starship operator on a hidden friend operator does not
                    work
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mateusz.pusz at gmail dot com
  Target Milestone: ---

The following code does not compile:

```
struct B {
    int b;
    friend constexpr auto operator<=>(const B&, const B&) = default;
};

void foo()
{
  B b1, b2;
  b1 == b2;
}
```

https://godbolt.org/z/JBUqG8