/**
     * Returns {@code true} if the value has been partially collected, meaning that the value is
     * null.
     */
    static <K, V, E extends InternalEntry<K, V, E>> boolean isCollected(E entry) {
      return entry.getValue() == null;
    }

    /**
     * Gets the value from an entry. Returns {@code null} if the entry is invalid or
     * partially-collected.
     */

   *     {@code get()} throws a different kind of exception, that exception itself.
   * @param executor the executor that runs {@code fallback} if {@code input} fails
   * @since 19.0
   */
  @J2ktIncompatible
  @Partially.GwtIncompatible("AVAILABLE but requires exceptionType to be Throwable.class")
  public static <V extends @Nullable Object, X extends Throwable> ListenableFuture<V> catching(
      ListenableFuture<? extends V> input,

    Object key = new Object();
    assertThat(cache.getUnchecked(key)).isNotNull();

    CacheTesting.simulateValueReclamation(cache, key);

    // this blocks if computation can't deal with partially-collected values
    assertThat(cache.getUnchecked(key)).isNotNull();
    assertThat(cache.size()).isEqualTo(1);
    assertThat(countingLoader.getCount()).isEqualTo(2);

    Object key = new Object();
    assertThat(cache.getUnchecked(key)).isNotNull();

    CacheTesting.simulateValueReclamation(cache, key);

    // this blocks if computation can't deal with partially-collected values
    assertThat(cache.getUnchecked(key)).isNotNull();
    assertThat(cache.size()).isEqualTo(1);
    assertThat(countingLoader.getCount()).isEqualTo(2);