https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99086
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> (In reply to crillion from comment #0)
> > #include <iterator>
> >
> > class value_wrapper
> > {
> > public :
> >
> > bool operator<=>(const value_wrapper& rhs) const = default;
>
> This is a bug, the spaceship operator has to return one of
> std::strong_ordering, std::weak_ordering or std::partial_ordering.
That's not quite true, it can be something that std::strong_ordering is
convertible to. But it can't be bool.
If you're defaulting it, you probably want to just return auto and let the
compiler get the type right.
