/guava/guava/src/com/google/common/collect/ImmutableMultimap.java
builderMap.put( key, valueCollection = Builder( ) ) ;
builderMap.put ( key, valueCollection = newMutableValueCollection ( ) ) ;
} @CanIgnoreReturnValue public Builder<K, V> put(K key, V value) { checkEntryNotNull(key, value); Collection<V> valueCollection = builderMap.get(key); if (valueCollection == null) { <extra_id_0> } valueCollection.add(value); return this; } @CanIgnoreReturnValue public Builder<K, V> put(Entry<? extends K, ? extends V> entry) {