/guava/guava/src/com/google/common/collect/TreeMultiset.java
current.right = null; current.left = null;
current.left = null; current.right = null;
@Override public void clear() { if (!range.hasLowerBound() && !range.hasUpperBound()) { for (AvlNode<E> current = header.succ(); current != header; ) { AvlNode<E> next = current.succ(); current.elemCount = 0; <extra_id_0> current.pred = null; current.succ = null; current = next; } successor(header, header); rootReference.clear();