/in/foo.cc: In function 'std::ostream& operator<<(std::ostream&, const Time&)':
/in/foo.cc:10:2: warning: no return statement in function returning non-void [-Wreturn-type]
  }
  ^
/in/foo.cc: In function 'std::ostream& operator<<(std::ostream&, const Date&)':
/in/foo.cc:46:2: warning: no return statement in function returning non-void [-Wreturn-type]
  }
  ^