1// PR c++/70648
2// { dg-do compile { target c++11 } }
3
4struct C
5{
6  template <class... U>
7  constexpr C (...) : c { static_cast<U &&>(0)... } {}
8  int c[1];
9};
10
11static constexpr int b = C{}.c[0];
12