Correct.

```
scala29
Welcome to Scala version 2.9.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_37).
Type in expressions to have them evaluated.
Type :help for more information.

scala> List(1) -- List(2)
warning: there were 1 deprecation warnings; re-run with -deprecation for details
res0: List[Int] = List(1)
```