newDelegate.add(element(i));
    }
    this.table = newDelegate;
    this.entries = null;
    this.elements = null;
    incrementModCount();
    return newDelegate;
  }

  @VisibleForTesting
  boolean isUsingHashFloodingResistance() {
    return delegateOrNull() != null;
  }

  /** Stores the hash table mask as the number of bits needed to represent an index. */

  }

  /*
   * We don't permit nulls, but we wrap every comparator with nullsFirst().
   * Why? We want for queries like containsKey(null) to return false, but the
   * GWT SortedMap implementation that we delegate to throws
   * NullPointerException if the comparator does. Since our construction
   * methods ensure that null is never present in the map, it's OK for the

  @GwtIncompatible // suite
  @AndroidIncompatible // test-suite builders
  public static Test suite() {
    TestSuite suite = new TestSuite();
    // TODO(lowasser): should we force TreeMultimap to be more thorough about checking nulls?
    suite.addTest(
        SortedSetMultimapTestSuiteBuilder.using(
                new TestStringSetMultimapGenerator() {
                  @Override

    }

    @Test
    @DisplayName("Null inputs: read(byte[]) and write* with nulls throw NPE")
    void nullInputs_throwNPE() throws Exception {
        SmbRandomAccessFile raf = newInstance("rw", false, true, false);
        assertThrows(NullPointerException.class, () -> raf.read((byte[]) null));
        assertThrows(NullPointerException.class, () -> raf.writeBytes(null));

    static FactoryMethodReturnsNullButNotAnnotated returnsNull() {
      return null;
    }
  }

  static class FactoryMethodReturnsNullAndAnnotated {
    private FactoryMethodReturnsNullAndAnnotated() {}

    public static @Nullable FactoryMethodReturnsNullAndAnnotated returnsNull() {
      return null;
    }
  }

  static class FactoryMethodAcceptsNull {

   * removal operations, and these are reflected in the underlying table.
   *
   * <p>It's acceptable for the underlying table to contain null keys, and even null values provided
   * that the function is capable of accepting null input. The transformed table might contain null
   * values, if the function sometimes gives a null result.
   *
   * <p>The returned table is not thread-safe or serializable, even if the underlying table is.
   *

    if (delegate != null) {
      metadata =
          Ints.constrainToRange(size(), CompactHashing.DEFAULT_SIZE, CompactHashing.MAX_SIZE);
      delegate.clear(); // invalidate any iterators left over!
      table = null;
      size = 0;
    } else {
      Arrays.fill(requireKeys(), 0, size, null);
      Arrays.fill(requireValues(), 0, size, null);
      CompactHashing.tableClear(requireTable());

    if (delegate != null) {
      metadata =
          Ints.constrainToRange(size(), CompactHashing.DEFAULT_SIZE, CompactHashing.MAX_SIZE);
      delegate.clear(); // invalidate any iterators left over!
      table = null;
      size = 0;
    } else {
      Arrays.fill(requireKeys(), 0, size, null);
      Arrays.fill(requireValues(), 0, size, null);
      CompactHashing.tableClear(requireTable());

    TreeSet<Integer> set = Sets.newTreeSet(SOME_COLLECTION);
    verifySortedSetContents(set, SOME_COLLECTION, null);
  }

  public void testNewTreeSetFromIterable() {
    TreeSet<Integer> set = Sets.newTreeSet(SOME_ITERABLE);
    verifySortedSetContents(set, SOME_ITERABLE, null);
  }

  public void testNewTreeSetFromIterableDerived() {

    List<@Nullable String> list = newArrayList("a", null, "b", null, "a", null);
    assertEquals(2, frequency(list.iterator(), "a"));
    assertEquals(1, frequency(list.iterator(), "b"));
    assertEquals(0, frequency(list.iterator(), "c"));
    assertEquals(0, frequency(list.iterator(), 4.2));
    assertEquals(3, frequency(list.iterator(), null));
  }

  @GwtIncompatible // slow (~4s)