askance--
Said he thanked the whiting kindly, but he would not join the
   dance.
    Would not, could not, would not, could not, would not join
        the dance.
    Would not, could not, would not, could not, could not join
        the dance.

`"What matters it how far we go?" his scaly friend replied.

                                                       askance--
Said he thanked the whiting kindly, but he would not join the
   dance.
    Would not, could not, would not, could not, would not join
        the dance.
    Would not, could not, would not, could not, could not join
        the dance.

`"What matters it how far we go?" his scaly friend replied.

    failure.initCause(cause);
    return failure;
  }

  // This test covers a bug where an Error thrown from a callback could cause the TimeoutFuture to
  // never complete when timing out.  Notably, nothing would get logged since the Error would get
  // stuck in the ScheduledFuture inside of TimeoutFuture and nothing ever calls get on it.

    return valueStrength != Strength.STRONG;
  }

  enum Strength {
    /*
     * TODO(kevinb): If we strongly reference the value and aren't loading, we needn't wrap the
     * value. This could save ~8 bytes per entry.
     */

    STRONG {
      @Override
      <K, V> ValueReference<K, V> referenceValue(
          Segment<K, V> segment, ReferenceEntry<K, V> entry, V value, int weight) {

    failure.initCause(cause);
    return failure;
  }

  // This test covers a bug where an Error thrown from a callback could cause the TimeoutFuture to
  // never complete when timing out.  Notably, nothing would get logged since the Error would get
  // stuck in the ScheduledFuture inside of TimeoutFuture and nothing ever calls get on it.

    return valueStrength != Strength.STRONG;
  }

  enum Strength {
    /*
     * TODO(kevinb): If we strongly reference the value and aren't loading, we needn't wrap the
     * value. This could save ~8 bytes per entry.
     */

    STRONG {
      @Override
      <K, V> ValueReference<K, V> referenceValue(
          Segment<K, V> segment, ReferenceEntry<K, V> entry, V value, int weight) {

    consumer.accept(new ValueAndCloser<C>(closingFuture));
  }

  /**
   * Attempts to cancel execution of this step. This attempt will fail if the step has already
   * completed, has already been cancelled, or could not be cancelled for some other reason. If
   * successful, and this step has not started when {@code cancel} is called, this step should never
   * run.
   *

        /*
         * The cast is safe because onlyOnRight contains all the keys of right.
         *
         * TODO(cpovirk): Consider checking onlyOnRight.containsKey instead of right.containsKey.
         * That could change behavior if the input maps use different equivalence relations (and so
         * a key that appears once in `right` might appear multiple times in `left`). We don't