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From: "fiesh at zefix dot tv" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/88804] incorrect unused but set static variable in
 templated lambda
Date: Wed, 26 Apr 2023 12:46:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88804

fiesh at zefix dot tv changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fiesh at zefix dot tv

--- Comment #7 from fiesh at zefix dot tv ---
I suppose this snippet also exhibits this bug here?

template <int... Is> struct IntegerSequence {};

template <int i> struct IntegralConstant {
  constexpr auto operator()() const { return i; }
};

template <typename F, typename IndexType, IndexType... index>
constexpr void apply(F const &f, IntegerSequence<index...>) {
  (f(IntegralConstant<index>{}), ...);
}

template <auto size, typename F> constexpr void constexpr_foreach(F const &=
f) {
  apply<F, int>(f, IntegerSequence<0>{});
}

int main() {
  static int i[1] =3D {42};

  int j{};
  constexpr_foreach<1>([&j](auto const index) { j +=3D i[index()]; });
  return j;
}=