src/main/java/org/jboss/util/collection/ConcurrentSkipListMap.java
final boolean casRight(Index<K,V> cmp, Index<K,V> val) {
            return rightUpdater.compareAndSet(this, cmp, val);
        }
final boolean casRight(Index<K,V> cmp, Index<K,V> val) {
            return rightUpdater.compareAndSet(this, cmp, val);
        }
compareAndSet right field