/guava/guava/src/com/google/common/collect/AbstractMapBasedMultimap.java
ancestor.refreshIfEmpty( ) ;ancestor.addToMap( ) ;
ancestor.addToMap ( ) ;
@ParametricNullness K getKey() { return key; } void addToMap() { if (ancestor != null) { <extra_id_0> } else { map.put(key, delegate); } } @Override public int size() {