/guava/guava/src/com/google/common/collect/HashBiMap.java
toRemove = entry; next = entry.nextInKeyInsertionOrder;BiEntry<K, V> entry = requireNonNull( next) ;
BiEntry<K, V> entry = requireNonNull ( next ) ; next = entry.nextInKeyInsertionOrder; toRemove = entry;
} @Override public T next() { if (!hasNext()) { throw new NoSuchElementException(); } <extra_id_0> remaining--; return output(entry); } @Override public void remove() { if (modCount != expectedModCount) {