`I don't believe it,' said the Pigeon; `but if they do, why
then they're a kind of serpent, that's all I can say.'

  This was such a new idea to Alice, that she was quite silent
for a minute or two, which gave the Pigeon the opportunity of
adding, `You're looking for eggs, I know THAT well enough; and
what does it matter to me whether you're a little girl or a
serpent?'

  `I don't believe it,' said the Pigeon; `but if they do, why
then they're a kind of serpent, that's all I can say.'

  This was such a new idea to Alice, that she was quite silent
for a minute or two, which gave the Pigeon the opportunity of
adding, `You're looking for eggs, I know THAT well enough; and
what does it matter to me whether you're a little girl or a
serpent?'

      // don't consider expiration as we're concurrent with loading
      try {
        V value = valueReference.waitForValue();
        if (value == null) {
          throw new InvalidCacheLoadException("CacheLoader returned null for key " + key + ".");
        }
        // re-read ticker now that loading has completed
        long now = map.ticker.read();

    bulkFuture.addListener(
        new Runnable() {
          @Override
          public void run() {
            /*
             * This is similar to the above test, but this time we're making sure that we recognize
             * that the output Future is done early not because of an exception but because of a
             * cancellation.
             */

      // don't consider expiration as we're concurrent with loading
      try {
        V value = valueReference.waitForValue();
        if (value == null) {
          throw new InvalidCacheLoadException("CacheLoader returned null for key " + key + ".");
        }
        // re-read ticker now that loading has completed
        long now = map.ticker.read();

    bulkFuture.addListener(
        new Runnable() {
          @Override
          public void run() {
            /*
             * This is similar to the above test, but this time we're making sure that we recognize
             * that the output Future is done early not because of an exception but because of a
             * cancellation.
             */

   * IllegalStateException}.)
   *
   * @since 33.2.0 (available since 21.0 in guava-jre)
   */
  @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
  @IgnoreJRERequirement // Users will use this only if they're already using streams.
  @Beta // TODO: b/288085449 - Remove.
  public static <T extends @Nullable Object, K extends Enum<K>, V>
      Collector<T, ?, ImmutableMap<K, V>> toImmutableEnumMap(