Persistent data structures in Scala

Question

Are all immutable data structures in Scala persistent? If not, which of them are and which not? What are the behavioural characteristics of those which are persistent? Also,

Answer 1

List, Vector, HashMap and HashSet are all persistent on Scala 2.8. There are other persistent data structures, but these covering all the major uses, I'm not sure there's any point in enumerating all of them.