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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109751] boost iterator_interface fails concept check
 starting in gcc-13
Date: Fri, 05 May 2023 20:01:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109751

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced down to:
```
template<typename _Tp> concept cmpeq
  =3D requires(_Tp __t, _Tp __u) { { __u !=3D __t } ; };
template<typename D>
struct iterator_interface
{
  friend constexpr bool operator>=3D(D lhs, D rhs) requires cmpeq<D> { retu=
rn
true; }
};
template<typename T>
struct iterator : iterator_interface<iterator<T>>
{
    bool operator=3D=3D(iterator) const;
    iterator &operator++();
    iterator &operator++(int);
};
static_assert(cmpeq<iterator<int>>);
```
Which does make it look invalid for the reasons why I mentioned. clang comp=
iles
the above just fine and so does GCC 12.x.=