/guava/guava/src/com/google/common/collect/ConcurrentHashMultiset.java
if ( existingCounter.compareAndSet( oldValue, newCount) ) {
if ( existingCounter.compareAndSet ( oldValue, count ) ) {
|| countMap.replace(element, existingCounter, newCounter)) { return 0; } } break; } else { <extra_id_0> if (count == 0) { countMap.remove(element, existingCounter); } return oldValue; } }