return valueReference;
    }

    private static final class LinkedWeakKeyWeakValueEntry<K, V>
        extends WeakKeyWeakValueEntry<K, V> {
      private final WeakKeyWeakValueEntry<K, V> next;

      LinkedWeakKeyWeakValueEntry(
          ReferenceQueue<K> queue, K key, int hash, WeakKeyWeakValueEntry<K, V> next) {
        super(queue, key, hash);