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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/101443] internal compiler error: in wide_int_to_tree_1, at
 tree.c:1519
Date: Wed, 14 Jul 2021 09:13:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101443

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

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

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced testcase for -O2:
template <typename a> struct e { a c; };
template <typename d> struct f { void operator()(d g, d h) { g < h; } };
template <unsigned long, typename> struct n;
template <long i, typename d> using j =3D typename n<i, d>::k;
template <typename...> class ah {};
template <unsigned long i, typename ag, typename... l>
struct n<i, ah<ag, l...>> : n<i - 1, ah<l...>> {};
template <typename ag, typename... l> struct n<0, ah<ag, l...>> { typedef a=
g k;
};
template <int i, typename... ai> j<i, ah<ai...>> aj(ah<ai...>);
template <typename m, int i> struct o { static bool am(int g, m h) { 0 <
aj<i>(h) || o<m, 1>::am(g, h); return false; } };
template <typename... ap, typename... aq> void operator<(ah<ap...>, ah<aq..=
.>)
{
  using ar =3D o<ah<aq...>, 0>;
  ar::am;
}
template <typename... ai> ah<ai...> as(ai...);
template <typename d> struct F { d operator*(); };
template <typename av> struct p { typedef F<av> ay; };
template <typename az, typename ba =3D f<az>> struct q {
  void operator[](az g) { typename p<e<az>>::ay i; bh()(g, (*i).c); }
  ba bh();
};
struct r {
  template <typename... bj> static int aj(bj... g) {
    auto a =3D as(g...);
    using bc =3D decltype(a);
    q<bc> b;
    b[a];
    return 0;
  }
  template <typename... bj> static int bn(bj... g) { aj(g...); return 0; }
};
int main() { r::bn(0, nullptr); }

Even simpler testcase:
decltype(nullptr) foo ();
bool bar () { return 0 < foo () || foo () < 0; }=