anchor.diff:                                      KeyNoXC,
                                       SubtreeNoXC,
                                       KeyValuesXC,
  -                                    case SubtreeNoXC == 0 of
  -                                        true ->
  +                                    case SubtreeNoXC of
  +                                        0 ->
                                               [];
                                           _ ->
                                               lists:append([
  
positive.code:                                 KeyNoXCRight,
                                  SubtreeNoXCRight,
                                  KeyValuesXCRight,
                                  case SubtreeNoXC == 0 of
                                      true ->
                                          [];
                                      _ ->
                                          InsertFunction(
  
negative.code:                                                 Key,
                                                  {
                                                      KeyNoXC + KeyNoXCRight + 1,
                                                      case SubtreeNoXC of
                                                          0 ->
                                                              0;
                                                          _ ->
                                                              SubtreeNoXC + SubtreeNoXCRight
  