/guava/guava/src/com/google/common/collect/Synchronized.java
asMap = new SynchronizedAsMap<>( delegate( ).asMap( ) , mutex) ;keys = multiset( delegate( ).keys( ) , mutex) ;
keys = multiset ( delegate ( ) .keys ( ) , mutex ) ;
} } @Override public Multiset<K> keys() { synchronized (mutex) { if (keys == null) { <extra_id_0> } return keys; } } @Override public boolean equals(@CheckForNull Object o) {