return unmodifiableRowSortedTable(table).rowKeySet();
                  }

                  @Override
                  public List<String> order(List<String> insertionOrder) {
                    sort(insertionOrder);
                    return insertionOrder;
                  }
                })
            .named("unmodifiableRowSortedTable[TreeBasedTable].rowKeySet")

                    return unmodifiableRowSortedTable(table).rowKeySet();
                  }

                  @Override
                  public List<String> order(List<String> insertionOrder) {
                    sort(insertionOrder);
                    return insertionOrder;
                  }
                })
            .named("unmodifiableRowSortedTable[TreeBasedTable].rowKeySet")

          .put(ImmutableBiMap.class, ImmutableBiMap.of())
          .put(Table.class, ImmutableTable.of())
          .put(ImmutableTable.class, ImmutableTable.of())
          .put(RowSortedTable.class, Tables.unmodifiableRowSortedTable(TreeBasedTable.create()))
          .put(ClassToInstanceMap.class, ImmutableClassToInstanceMap.builder().build())
          .put(ImmutableClassToInstanceMap.class, ImmutableClassToInstanceMap.builder().build())

          .put(ImmutableBiMap.class, ImmutableBiMap.of())
          .put(Table.class, ImmutableTable.of())
          .put(ImmutableTable.class, ImmutableTable.of())
          .put(RowSortedTable.class, Tables.unmodifiableRowSortedTable(TreeBasedTable.create()))
          .put(ClassToInstanceMap.class, ImmutableClassToInstanceMap.builder().build())
          .put(ImmutableClassToInstanceMap.class, ImmutableClassToInstanceMap.builder().build())

   * @return an unmodifiable view of the specified table
   * @since 11.0
   */
  public static <R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>
      RowSortedTable<R, C, V> unmodifiableRowSortedTable(
          RowSortedTable<R, ? extends C, ? extends V> table) {
    /*
     * It's not ? extends R, because it's technically not covariant in R. Specifically,