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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102419] [11/12 Regression][concepts] [regression]
 return-type-requirement of "Y<typename T::type>" does not check that T::type
 actually exists
Date: Tue, 21 Sep 2021 15:18:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102419

--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
And similarly for:

  template<class> concept Y =3D true;
  template<class T> concept X =3D Y<typename T::type>;
  static_assert(!X<int>);

GCC rejects and Clang/MSVC accept.  IMHO Clang/MSVC are clearly misbehaving
here -- when evaluating the concept-id X<int>, they appear to be substituti=
ng
{int} into X's constraint-expression instead of into the normal form of X's
constraint-expression.=