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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109648] New: ICE: tree check: expected type_pack_expansion
 or expr_pack_expansion, have error_mark in tsubst_pack_expansion, at
 cp/pt.cc:13551
Date: Thu, 27 Apr 2023 15:13:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109648

            Bug ID: 109648
           Summary: ICE: tree check: expected type_pack_expansion or
                    expr_pack_expansion, have error_mark in
                    tsubst_pack_expansion, at cp/pt.cc:13551
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

struct S {
  int operator[](int);
};

auto foo(auto v) {
  return [&]<int... Is> {
    return (v()[Is] + ...);
  }.template operator()<>();
}

auto test() {
  auto v =3D [] { return S{}; };
  return [&]<int... Is> {
    return (foo(v()[Is]) + ...);
  }.template operator()<>();
}

int main() {
  test();
}

https://godbolt.org/z/Ye89xfKdY=