int main() {
  int const a = 5;
  int const *b = &a;

  int const *const c = &a;

  int const *const *const d = &c;

  int const *const *const &e = d;

  int const &ref2 = 42; // true or false ?
  int &&ref3 = 42;

  auto const t = b;    // type ?
  auto tt = a;         // type ?
  auto ttt = c;        // type ?
  auto tttt = d;       // type ?
  auto ttttt = e;      // type ?
  auto tttttt = ref2...