this.future = task;
  }

  /**
   * Returns a future that finishes when this step does. Calling {@code get()} on the returned
   * future returns {@code null} if the step is successful or throws the same exception that would
   * be thrown by calling {@code finishToFuture().get()} if this were the last step. Calling {@code
   * cancel()} on the returned future has no effect on the {@code ClosingFuture} pipeline.
   *

        Segment<K, V> segment, K key, int hash, @CheckForNull ReferenceEntry<K, V> next);

    /**
     * Copies an entry, assigning it a new {@code next} entry.
     *
     * @param original the entry to copy. But avoid calling {@code getKey} on it: Instead, use the
     *     {@code key} parameter. That way, we prevent the key from being garbage collected in the

to curtsey as she spoke--fancy CURTSEYING as you're falling
through the air!  Do you think you could manage it?)  `And what
an ignorant little girl she'll think me for asking!  No, it'll
never do to ask:  perhaps I shall see it written up somewhere.'

  Down, down, down.  There was nothing else to do, so Alice soon
began talking again.  `Dinah'll miss me very much to-night, I

   * {@code k.equals(k2)} implies that {@code k2} is also of type {@code K}. Using a key type for
   * which this may not hold, such as {@code ArrayList}, may risk a {@code ClassCastException} when
   * calling methods on the resulting map view.
   *
   * @since 14.0
   */
  public static <K extends @Nullable Object, V extends @Nullable Object> Map<K, V> asMap(
      Set<K> set, Function<? super K, V> function) {

            return successfulAsList(ImmutableSet.of(a, b));
          }
        };
  }

  /**
   * Very rough equivalent of a timed get, produced by calling the no-arg get method in another
   * thread and waiting a short time for it.
   *
   * <p>We need this to test the behavior of no-arg get methods without hanging the main test thread
   * forever in the case of failure.

        Segment<K, V> segment, K key, int hash, @CheckForNull ReferenceEntry<K, V> next);

    /**
     * Copies an entry, assigning it a new {@code next} entry.
     *
     * @param original the entry to copy. But avoid calling {@code getKey} on it: Instead, use the
     *     {@code key} parameter. That way, we prevent the key from being garbage collected in the

            return successfulAsList(ImmutableSet.of(a, b));
          }
        };
  }

  /**
   * Very rough equivalent of a timed get, produced by calling the no-arg get method in another
   * thread and waiting a short time for it.
   *
   * <p>We need this to test the behavior of no-arg get methods without hanging the main test thread
   * forever in the case of failure.

to curtsey as she spoke--fancy CURTSEYING as you're falling
through the air!  Do you think you could manage it?)  `And what
an ignorant little girl she'll think me for asking!  No, it'll
never do to ask:  perhaps I shall see it written up somewhere.'

  Down, down, down.  There was nothing else to do, so Alice soon
began talking again.  `Dinah'll miss me very much to-night, I