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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99086] including <iterator> and defaulting spaceship
 operator causes compiler segfault
Date: Sun, 14 Feb 2021 20:55:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99086

--- 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>
> >=20
> > class value_wrapper
> > {
> > 	public :
> >=20=09=09
> > 		bool operator<=3D>(const value_wrapper& rhs) const =3D default;
>=20
> 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.=