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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/97399] [9/10/11 Regression] g++ 9.3 cannot compile SFINAE
 code with separated declaration and definition, g++ 7.3 compiles
Date: Tue, 13 Oct 2020 14:10:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97399

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aoliva at gcc dot gnu.org,
                   |                            |marxin at gcc dot gnu.org

--- Comment #3 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Reduced test-case:

$ cat pr97399.ii
template <int __v> struct integral_constant {
  static constexpr int value =3D __v;
};
template <bool, class> using enable_if_t =3D int;
struct tmp {
  template <class> static constexpr auto is_integral() -> bool;
  template <class E>
  static auto func(E, E) -> enable_if_t<tmp::is_integral<E>(), bool>;
};
template <class> constexpr auto tmp::is_integral() -> bool {
  return integral_constant<false>::value;
}
int main() { tmp::func(1, 0); }

Started with r9-5972-g10839133ce6c196c.=