/guava/android/guava/src/com/google/common/collect/Synchronized.java
if ( ( asMapEntrySet) == null) {   asMapEntrySet = new SynchronizedAsMapEntries<>( delegate( ).entrySet( ) , mutex) ; }
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} } @CheckForNull transient NavigableSet<K> descendingKeySet; @Override public NavigableSet<K> descendingKeySet() { synchronized (mutex) { <extra_id_0> return descendingKeySet = Synchronized.navigableSet(delegate().descendingKeySet(), mutex); } return descendingKeySet; } } @CheckForNull transient NavigableMap<K, V> descendingMap;