InternalEntry<K, V, ?> e,
        WeakValueReference<K, V, ? extends InternalEntry<K, V, ?>> valueReference) {
      StrongKeyWeakValueEntry<K, V> entry = castForTesting(e);
      @SuppressWarnings("unchecked")
      WeakValueReference<K, V, StrongKeyWeakValueEntry<K, V>> newValueReference =
          (WeakValueReference<K, V, StrongKeyWeakValueEntry<K, V>>) valueReference;

import com.google.common.collect.MapMakerInternalMap.Strength;
import com.google.common.collect.MapMakerInternalMap.WeakValueEntry;
import com.google.common.collect.MapMakerInternalMap.WeakValueReference;
import com.google.common.testing.NullPointerTester;
import java.lang.ref.Reference;
import java.util.concurrent.atomic.AtomicReferenceArray;
import junit.framework.TestCase;

import com.google.common.collect.MapMakerInternalMap.Strength;
import com.google.common.collect.MapMakerInternalMap.WeakValueEntry;
import com.google.common.collect.MapMakerInternalMap.WeakValueReference;
import com.google.common.testing.NullPointerTester;
import java.lang.ref.Reference;
import java.util.concurrent.atomic.AtomicReferenceArray;
import junit.framework.TestCase;

      this.previousWrite = previous;
    }
  }

  /** References a weak value. */
  private static class WeakValueReference<K, V> extends WeakReference<V>
      implements ValueReference<K, V> {
    final ReferenceEntry<K, V> entry;

    WeakValueReference(ReferenceQueue<V> queue, V referent, ReferenceEntry<K, V> entry) {
      super(referent, queue);
      this.entry = entry;
    }