iterator.go
func (it *Iterator) SeekToLast() {
	it.setNode(it.list.getPrev(it.list.tail, 0), true)
}
func (it *Iterator) SeekToLast() {
	it.setNode(it.list.getPrev(it.list.tail, 0), true)
}
func ( it * Iterator ) SeekToLast ( ) { it . setNode ( it . list . getPrev ( it . list . tail , 0 ) , true ) }
// SeekToLast seeks position at the last entry in list.
// Final state of iterator is Valid() iff list is not empty.
SeekToLast seeks position at the last entry in list . Final state of iterator is Valid () iff list is not empty .