if (s_before <= elemsbefore) {
             std::cerr << "In priv_range_insert_expand_backwards possibility 4/8 "<< std::endl;
            //The raw memory divides the old_begin group:
            //
            //If we need two phase construction (do_after)
            //new group is divided in new = new_beg + new_end groups
            //In this phase only new_beg will be inserted
            //
            //Old situation:
            // _________________________________________________
            //| raw_mem | old_begin | old_end |  raw_mem        |
            //|_________|___________|_________|_________________|
            //
            //New situation with do_after(1):
            //This is not definitive situation, the second phase
            //will include
            // _________________________________________________
            //| old_begin | new_beg | old_end |  raw_mem        |
            //|___________|_________|_________|_________________|
            //
            //New situation without do_after:
            // _________________________________________________
            //| old_begin | new | old_end |  raw_mem            |
            //|___________|_____|_________|_____________________|
            //
            //Copy the first part of old_begin to raw_mem
            T *start_n = old_start + difference_type(s_before);
            ::BOOST_CONTAINER_MOVE_NAMESPACE::uninitialized_move(old_start, start_n, new_start);
            //The buffer is all constructed until old_end,
            //release destroyer and update size
            old_values_destroyer.release();
            this->members_.m_size = old_size + s_before;
            //Now copy the second part of old_begin overwriting himself
            T* next = BOOST_CONTAINER_MOVE_NAMESPACE::move(start_n, pos, old_start);
            if(do_after){
             std::cerr << "In priv_range_insert_expand_backwards possibility 4/8 and do_after"<< std::endl;
               //Now copy the new_beg elements
               interf.copy_some_and_update(next, s_before, true);
            }
            else{
             std::cerr << "In priv_range_insert_expand_backwards possibility 4/8  and  NOT do_after"<< std::endl;
               //Now copy the all the new elements
               interf.copy_all_to(next);
               T* move_start = next + n;
               //Now displace old_end elements
               T* move_end   = BOOST_CONTAINER_MOVE_NAMESPACE::move(pos, old_finish, move_start);
               //Destroy remaining moved elements from old_end except if
               //they have trivial destructor after being moved
               difference_type n_destroy = s_before - n;
               if(!value_traits::trivial_dctr_after_move)
                  this->destroy_n(move_end, n_destroy);
               this->members_.m_size -= n_destroy;
            }
         }