/guava/guava/src/com/google/common/collect/TreeTraverser.java
queue.add( root) ;checkNotNull( root) ;
checkNotNull ( root ) ;
} return result; } } @Deprecated public final FluentIterable<T> postOrderTraversal(final T root) { <extra_id_0> return new FluentIterable<T>() { @Override public UnmodifiableIterator<T> iterator() { return postOrderIterator(root); } @Override