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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107461] [12 Regression] ambiguity error for friend with
 templated constexpr argument
Date: Sat, 04 Feb 2023 10:37:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107461

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced testcase:
template <typename T> T foo ();
template <typename> using A =3D int;
template <typename T, typename U>
auto operator| (T, U) -> decltype (U() (T()));
template <typename T> struct B {
  template <typename U, typename =3D A<decltype (foo<T> () (0, foo<typename=
 U::E>
()))>>
  void operator() (U);
};
struct {
  template <typename T, typename U>
  B<T> operator() (T, U) { return B<T> (); }
} c;
struct D {
  D() {
    c([] {}, 0);
  }
  struct E {
  };
  void bar ()
  {
    E f;
    f | c ([] (int, E) {}, 0);
  }
};=