package edu.berkeley.sbp.util;
import java.util.*;
+import java.io.*;
-public final class EmptyIterator<T> implements Iterable<T>, Iterator<T> {
+public final class EmptyIterator<T> implements Iterable<T>, Iterator<T>, Serializable {
public void remove() { throw new Error(); }
public boolean hasNext() { return false; }
public T next() { throw new Error(); }