throw new AssertionError();
    }

    /** Unsafely extracts the weak value reference inside of the given {@code entry}. */
    WeakValueReference<K, V, E> getWeakValueReferenceForTesting(InternalEntry<K, V, ?> entry) {
      throw new AssertionError();
    }

    /**
     * Unsafely creates of a fresh {@link WeakValueReference}, referencing the given {@code value},