Can a using-declaration be used to import a namespace?

namespace my_namespace{
  namespace my_namespace2 {
    int function_of_my_name_space(){ return 2;}
  }
}
int main (){
  using  ::my_namespace::my_namespace2;
  return my_namespace2::function_of_my_name_space();
}

Several popular compilers give an error on this, but there doesn't seem to be anything in 9.10 [namespace.udecl] that prohibits it. It should be noted that the user can get the same effect by using a namespace alias:

  namespace my_namespace2 = ::my_namespace::my_namespace2;

History Date User Action Args 2008-10-05 00:00:00adminsetstatus: wp -> cd1 2005-10-22 00:00:00adminsetstatus: dr -> wp 2005-05-01 00:00:00adminsetmessages: + msg1190 2005-05-01 00:00:00adminsetstatus: ready -> dr 2004-11-07 00:00:00adminsetmessages: + msg1047 2004-11-07 00:00:00adminsetstatus: drafting -> ready 2004-04-09 00:00:00adminsetmessages: + msg977 2004-04-09 00:00:00adminsetstatus: open -> drafting 2004-02-12 00:00:00admincreate