[Bug c++/97938] [9/10/11 Regression] g++ crash when inferring type of auto parameter pack in lambda capture

[jason at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Reduced more:

template <typename... Args>
int sink(Args&&... args) { return 2; }

template <typename T1>
auto fwd(const T1& t1) {
  return
    [] (auto&&... ts1) {
      return
        [...ts1 = ts1] () {
          return sink(ts1...);
        }();
    }();
}

int main() {
  return fwd(1);
}