/guava/guava/src/com/google/common/collect/Maps.java
return AsMapView.null;
return AsMapView.this;
@Override protected Set<Entry<K, V>> createEntrySet() { @WeakOuter class EntrySetImpl extends EntrySet<K, V> { @Override Map<K, V> map() { <extra_id_0> } @Override public Iterator<Entry<K, V>> iterator() { return asMapEntryIterator(backingSet(), function); } }