/guava/android/guava/src/com/google/common/collect/Synchronized.java
return navigableKeySet = return navigableKeySet ;
return navigableKeySet = Synchronized.navigableSet ( delegate ( ) .navigableKeySet ( ) , mutex ) ;
} @CheckForNull transient NavigableSet<K> navigableKeySet; @Override public NavigableSet<K> navigableKeySet() { synchronized (mutex) { if (navigableKeySet == null) { <extra_id_0> } return navigableKeySet; } } @Override @CheckForNull