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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98939] [C++23] Implement P1787R6 "Declarations and where to
 find them"
Date: Fri, 12 Nov 2021 21:14:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98939

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'm having trouble with "Default template arguments are now complete-class
contexts":

class C {
  template <typename...> struct _List;

  template <unsigned long, typename, bool B =3D value> struct S; // #1

  template <unsigned long _Sz, typename _Uint, typename... _UInts>
  struct S<_Sz, _List<_Uint, _UInts...>>; // #2

  static constexpr bool value =3D false;
};

#2 wants to lookup_template_class S, but S can contain a DEFERRED_PARSE, so
that's not going to work.  Perhaps we have to delay finish_template_type un=
til
the end of class somehow...=