163     case Time::LAST:

   163     case Time::LAST:

   164       NS_ABORT_MSG ("can't be reached");

   164       NS_ABORT_MSG ("can't be reached");

   165       unit = "unreachable";

   165       unit = "unreachable";

   166       break;

   166       break;

   167     }

   167     }

   169   os << v << unit;

   169   os << v << unit;

   170   return os;

   170   return os;

   171 }

   171 }

   172 std::istream& operator>> (std::istream& is, Time & time)

   172 std::istream& operator>> (std::istream& is, Time & time)

   173 {

   173 {