* to call getCopy and removeAllNodes only with a true K, then we could check containsKey first.
     * But that check wouldn't eliminate the warnings.)
     */
    @SuppressWarnings({"unchecked", "nullness"})
    K castKey = (K) key;
    List<V> oldValues = getCopy(castKey);
    removeAllNodes(castKey);
    return oldValues;
  }

  @Override
  public void clear() {
    head = null;

    if (firstEntry == null || lastEntry == null) {
      /*
       * Either both are null or neither is: Either the set is empty, or it's not. But we check both
       * to make the nullness checker happy.
       */
      throw new NoSuchElementException();
    }
    return Range.create(firstEntry.getValue().lowerBound, lastEntry.getValue().upperBound);
  }

  @Override

/**
 * Generates fresh instances of types that are different from each other (if possible).
 *
 * @author Ben Yu
 */
@GwtIncompatible
@J2ktIncompatible
@NullUnmarked
@SuppressWarnings("nullness")
class FreshValueGenerator {

  private static final ImmutableMap<Class<?>, Method> GENERATORS;

  static {
    ImmutableMap.Builder<Class<?>, Method> builder = ImmutableMap.builder();

    }
  }

  /*
   * Preconditions.checkNotNull is *intended* for performing eager null checks on parameters that a
   * nullness checker can already "prove" are non-null. That means that the first parameter to
   * checkNotNull *should* be annotated to require it to be non-null.
   *

      }

      @Override
      public boolean remove(@Nullable Object obj) {
        /*
         * `o instanceof Entry` is guaranteed by `contains`, but we check it here to satisfy our
         * nullness checker.
         */
        if (contains(obj) && obj instanceof Entry) {
          Entry<?, ?> entry = (Entry<?, ?>) obj;
          removeColumn(entry.getKey());
          return true;
        }

 *     .testEquals(); // or testNulls(), testSerializable() etc.
 * </pre>
 *
 * @author Ben Yu
 * @since 14.0
 */
@GwtIncompatible
@J2ktIncompatible
@NullUnmarked
@SuppressWarnings("nullness")
public final class ClassSanityTester {

  private static final Ordering<Invokable<?, ?>> BY_METHOD_NAME =
      new Ordering<Invokable<?, ?>>() {
        @Override

        default:
          /*
           * The suppression is safe because we ensure that the first `distinct` elements have been
           * populated.
           */
          @SuppressWarnings("nullness")
          Object[] elements =
              (distinct == dedupedElements.length)
                  ? dedupedElements
                  : Arrays.copyOf(dedupedElements, distinct);

    // compare a and b, we should get a CCE or NPE on the subsequent line. Only methods
    // that are spec'd to throw CCE and NPE should call this.
    @SuppressWarnings({"unchecked", "nullness"})
    Comparator<@Nullable Object> unsafeComparator = (Comparator<@Nullable Object>) comparator;
    return unsafeComparator.compare(a, b);
  }

  final transient Comparator<? super E> comparator;

  /*
   * The following methods are safe to call as long as the conditions in the *previous* comment are
   * met *and* the index is less than size().
   *
   * (The above explains when these methods are safe from a `nullness` perspective. From an
   * `unchecked` perspective, they're safe because we put only K/V elements into each array.)
   */

  @SuppressWarnings("unchecked")
  private K key(int i) {

@J2ktIncompatible
@GwtIncompatible
@SuppressWarnings({
  "GuardedBy", // TODO(b/35466881): Fix or suppress.
  "nullness", // too much trouble for the payoff
})
@NullUnmarked // TODO(cpovirk): Annotate for nullness.
final class MapMakerInternalMap<
        K,
        V,
        E extends MapMakerInternalMap.InternalEntry<K, V, E>,