anchor.diff:  
       lt_list = go_persistence->list( ).
       LOOP AT lt_list ASSIGNING <ls_list>.
  -      lv_index = sy-tabix.
  -
         IF iv_show_progress = abap_true.
           show_progress( iv_current = sy-tabix
                          iv_total   = lines( lt_list )
  
positive.code:         _raise 'identical keys'.
        ENDIF.
      ENDLOOP.
  
      io_repo->add( ).
  
      APPEND io_repo TO gt_list.
  
  
negative.code:     METHODS:
        refresh REDEFINITION,
        constructor
          IMPORTING is_data TYPE lcl_persistence_repo=>ty_repo
          RAISING   lcx_exception,
        get_url
          RETURNING VALUE(rv_url) TYPE lcl_persistence_repo=>ty_repo-url,
  