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