/guava/guava/src/com/google/common/collect/TreeTraverser.java
children ( t ) .forEach ( this ) ; }
public void forEach(Consumer<? super T> action) { checkNotNull(action); new Consumer<T>() { @Override public void accept(T t) { action.accept(t); <extra_id_0> }.accept(root); } }; } UnmodifiableIterator<T> preOrderIterator(T root) { return new PreOrderIterator(root);