/** @since 12.0 */
@GwtIncompatible("NavigableSet")
@Override
public ImmutableSortedSet<E> descendingSet() {
// racy single-check idiom
ImmutableSortedSet<E> result = descendingSet;
if (result == null) {
result = descendingSet = createDescendingSet();
result.descendingSet = this;
}
return result;
}
