/guava/guava/src/com/google/common/collect/Synchronized.java
return nullableSynchronizedEntry ( delegate ( ) .firstEntry ( ) , mutex ) ;
} } @Override @CheckForNull public Map.Entry<K, V> firstEntry() { synchronized (mutex) { <extra_id_0> } } @Override @CheckForNull public Map.Entry<K, V> floorEntry(K key) { synchronized (mutex) {