/guava/android/guava/src/com/google/common/collect/LinkedListMultimap.java
next = next ;
next = current = previous;
@Override @ParametricNullness public V previous() { if (previous == null) { throw new NoSuchElementException(); } <extra_id_0> previous = previous.previousSibling; nextIndex--; return current.value; } @Override public int nextIndex() {