// null check would be redundant
  }

  @CheckForNull
  ImmutableMapEntry<K, V> getNextInKeyBucket() {
    return null;
  }

  @CheckForNull
  ImmutableMapEntry<K, V> getNextInValueBucket() {
    return null;
  }

  /**
   * Returns true if this entry has no bucket links and can safely be reused as a terminal entry in
   * a bucket in another map.
   */
  boolean isReusable() {