}
        return old;
      }
    }

    /** Performs a GAS operation on the {@link #waiters} field. */
    @Override
    Waiter gasWaiters(AbstractFuture<?> future, Waiter update) {
      synchronized (future) {
        Waiter old = future.waiters;
        if (old != update) {
          future.waiters = update;
        }
        return old;
      }
    }

    @Override

                            v = value = new AltRes(e);
                        }
                    }
                }
            }
            if (v instanceof AltRes) {
                uncheckedThrow(((AltRes) v).t);
            }
            return (T) v;
        }

        static class AltRes {
            final Throwable t;

            AltRes(Throwable t) {
                this.t = t;

    return !iterable.iterator().hasNext();
  }

  /**
   * Returns an iterable over the merged contents of all given {@code iterables}. Equivalent entries
   * will not be de-duplicated.
   *
   * <p>Callers must ensure that the source {@code iterables} are in non-descending order as this
   * method does not sort its input.
   *
   * <p>For any equivalent elements across all {@code iterables}, it is undefined which element is

  public final V getOrDefault(@CheckForNull Object key, @CheckForNull V defaultValue) {
    /*
     * Even though it's weird to pass a defaultValue that is null, some callers do so. Those who
     * pass a literal "null" should probably just use `get`, but I would expect other callers to
     * pass an expression that *might* be null. This could happen with:
     *
     * - a `getFooOrDefault(@CheckForNull Foo defaultValue)` method that returns

                    };
                    filters.add(new PredicateVersionFilter(predicate));
                } else {
                    throw new IllegalArgumentException("Unsupported filter expression: " + expression);
                }
            }
        }
        if (filters.isEmpty()) {
            return null;
        } else if (filters.size() == 1) {
            return filters.get(0);
        } else {

   * avoid memory leaks when an element is no longer necessary.
   *
   * <p>This method accepts an array with element type {@code @Nullable T}, but callers must pass an
   * array whose contents are initially non-null. The {@code @Nullable} annotation indicates that
   * this method will write nulls into the array during iteration.
   *

  public final <S extends @Nullable T> Equivalence<Iterable<S>> pairwise() {
    // Ideally, the returned equivalence would support Iterable<? extends T>. However,
    // the need for this is so rare that it's not worth making callers deal with the ugly wildcard.
    return new PairwiseEquivalence<>(this);
  }

  /**
   * Returns a predicate that evaluates to true if and only if the input is equivalent to {@code