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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++/106026] ICE: error reporting routines re-entered.
Date: Thu, 18 May 2023 01:29:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106026

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced to:
```
struct k {
  template <typename CPO, typename... Args>
    auto operator()(CPO cpo, Args &&...args) const
      -> decltype(tag_invoke(cpo, args...))
    {
      return tag_invoke(cpo, args...);
    }
};
k j{};
struct nn {
  template <class T>
    friend void tag_invoke(nn, T &&) {  }
  auto operator()(auto x) const {
    return j(*this, x);
  }
};
constexpr nn h;
template <class T> concept has_extents =3D requires(T t) { h(t); };
template <has_extents T> constexpr void tag_invoke(nn, T &&) {}
static_assert(has_extents<int>);
```=