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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103952] New: ICE: in cp_finish_decl, at cp/decl.c:7933
Date: Sun, 09 Jan 2022 14:51:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103952

            Bug ID: 103952
           Summary: ICE: in cp_finish_decl, at cp/decl.c:7933
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

12 regression:

template<class>
struct A {
  template<int... Is>
  struct B {
    static constexpr auto c =3D [] { return Is; }();
    using type =3D decltype(c);
  };
};

#include<tuple>
int main() {
  typename A<std::tuple<int>>::B<0>::type x;
}

https://godbolt.org/z/fxvKWP4qM=