<BUG>return historyItems != null ? historyItems.iterator() : Iterators.<CHistoryItem>emptyIterator();</BUG><CONTEXT>public class CHistory implements Iterable<CHistoryItem> {public int size;public List<CHistoryItem> historyItems;@Overridepublic Iterator<CHistoryItem> iterator() {<extra_id_0>}@Overridepublic String toString() {</CONTEXT>
return historyItems != null ? historyItems.iterator() : ImmutableSet.<CHistoryItem>of().iterator();