} else {
      insert(newEntry, null);
      rehashIfNecessary();
      return null;
    }
  }

  @CanIgnoreReturnValue
  @Override
  @CheckForNull
  public V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
    return put(key, value, true);
  }

  @CanIgnoreReturnValue
  @CheckForNull

    setSucceeds(lastInInsertionOrder, size);
    setSucceeds(size, ENDPOINT);
    size++;
    modCount++;
    return null;
  }

  @Override
  @CanIgnoreReturnValue
  @CheckForNull
  public V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
    return put(key, value, true);
  }

  @CanIgnoreReturnValue
  @CheckForNull

  @CheckForNull
  public V put(@ParametricNullness K key, @ParametricNullness V value) {
    return putInBothMaps(key, value, false);
  }

  @CanIgnoreReturnValue
  @Override
  @CheckForNull
  public V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
    return putInBothMaps(key, value, true);
  }

  @CheckForNull

  @SuppressWarnings("DoNotCall")
  public void testForcePut() {
    BiMap<String, Integer> bimap = ImmutableBiMap.copyOf(ImmutableMap.of("one", 1, "two", 2));
    assertThrows(UnsupportedOperationException.class, () -> bimap.forcePut("three", 3));
  }

  public void testKeySet() {
    ImmutableBiMap<String, Integer> bimap =
        ImmutableBiMap.copyOf(ImmutableMap.of("one", 1, "two", 2, "three", 3, "four", 4));

   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  @CheckForNull
  public final V forcePut(K key, V value) {
    throw new UnsupportedOperationException();
  }

  /**
   * Serialized type for all ImmutableBiMap instances. It captures the logical contents and they are

   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  @CheckForNull
  public final V forcePut(K key, V value) {
    throw new UnsupportedOperationException();
  }

  /**
   * Serialized type for all ImmutableBiMap instances. It captures the logical contents and they are

  }

  @CanIgnoreReturnValue
  protected boolean set(V value) {
    if (!state.permitsPublicUserToTransitionTo(State.VALUE)) {
      return false;
    }

    forceSet(value);
    return true;
  }

  private void forceSet(V value) {
    this.value = value;
    this.state = State.VALUE;
    notifyAndClearListeners();
  }

  @CanIgnoreReturnValue