message: Don't depend on equality of char* in view.cartesian_product
diff: @@ -225,7 +225,7 @@ int main()
  range_reference_t<Rng>,
  common_tuple<int &, char const * &>>());
  - using CT = common_tuple<int, char const *>;
  + using CT = common_tuple<int, std::string>;
  std::initializer_list<CT> control = {
  CT{0, "John"}, CT{0, "Paul"}, CT{0, "George"}, CT{0, "Ringo"},
  CT{1, "John"}, CT{1, "Paul"}, CT{1, "George"}, CT{1, "Ringo"},
  