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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/97938] [9/10/11 Regression]  g++ crash when inferring type
 of auto parameter pack in lambda capture
Date: Thu, 01 Apr 2021 22:39:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97938

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |jason at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gn=
u.org

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Removed library dependency:

template <class F, class... Args>
auto apply(F&& f, Args&&... args) { return f(args...); }

template <class T> T&& forward(T&& t);

template <typename... Args>
int print_args(Args&&... args) {
  return sizeof...(args);
}

template <typename T1, typename T2>
auto fwd(const T1& t1, const T2& t2) {
  return ::apply([&t2] (auto&&... ts1) {
    return ::apply([...ts1 =3D forward<decltype(ts1)>(ts1)] (auto&&... ts2)=
 {
      return print_args(ts1..., forward<decltype(ts2)>(ts2)...);
    }, t2);
  }, t1);
}

int main() {
  auto t1 =3D 1;
  auto t2 =3D 2;
  return fwd(t1, t2);
}=