def validate_row(vb_list, start_list, index_column)
      start_vb = start_list[index_column]
      index_vb = vb_list[index_column]
      row_index = index_vb.name.index(start_vb.name)
      vb_list.each_index do |i|
        if i != index_column
          expected_oid = start_list[i].name + row_index
          if vb_list[i].name != expected_oid
            vb_list[i] = VarBind.new(expected_oid, NoSuchInstance).with_mib(@mib)
          end
        end
      end
      vb_list
    end
def validate_row(vb_list, start_list, index_column)
      start_vb = start_list[index_column]
      index_vb = vb_list[index_column]
      row_index = index_vb.name.index(start_vb.name)
      vb_list.each_index do |i|
        if i != index_column
          expected_oid = start_list[i].name + row_index
          if vb_list[i].name != expected_oid
            vb_list[i] = VarBind.new(expected_oid, NoSuchInstance).with_mib(@mib)
          end
        end
      end
      vb_list
    end
Helper method for walk.  Checks all of the VarBinds in vb_list to
 make sure that the row indices match.  If the row index does not
 match the index column, then that varbind is replaced with a varbind
 with a value of NoSuchInstance.