}

  /**
   * Returns an immutable map instance containing the given entries. Internally, the returned map
   * will be backed by an {@link EnumMap}.
   *
   * <p>The iteration order of the returned map follows the enum's iteration order, not the order in
   * which the elements appear in the given map.
   *
   * @param map the map to make an immutable copy of
   * @return an immutable map containing those entries
   * @since 14.0

  /**
   * Starts a {@link ClosingFuture} pipeline with a {@link ListenableFuture}.
   *
   * <p>{@code future}'s value will not be closed when the pipeline is done even if {@code V}
   * implements {@link Closeable}. In order to start a pipeline with a value that will be closed
   * when the pipeline is done, use {@link #submit(ClosingCallable, Executor)} instead.
   */

    assertSame(valueThree, newFirst.getValueReference().get());
    assertEquals(hashThree, newFirst.getHash());
    assertSame(entryOne, newFirst.getNext());

    // tail (remaining entries are copied in reverse order)
    newFirst = segment.removeEntryFromChain(entryThree, entryOne);
    assertSame(keyTwo, newFirst.getKey());
    assertSame(valueTwo, newFirst.getValueReference().get());
    assertEquals(hashTwo, newFirst.getHash());

    assertSame(valueThree, newFirst.getValueReference().get());
    assertEquals(hashThree, newFirst.getHash());
    assertSame(entryOne, newFirst.getNext());

    // tail (remaining entries are copied in reverse order)
    newFirst = segment.removeEntryFromChain(entryThree, entryOne);
    assertSame(keyTwo, newFirst.getKey());
    assertSame(valueTwo, newFirst.getValueReference().get());
    assertEquals(hashTwo, newFirst.getHash());