REPL behaves strangely on first try, OK afterwards.

[odersky]

Here's a transcript:

scala> trait A 
defined trait A
scala> trait B 
defined trait B
scala> class C extends A with B 
-- Error: <console>:6:23 -------------------------------------------------------
6 |class C extends A with B
  |                       ^
  |unexpected parent type: HKApply(TypeRef(ThisType(TypeRef(NoPrefix,<empty>)),A),List(TypeRef(ThisType(TypeRef(NoPrefix,<empty>)),B)))
scala> class C extends A with B 
defined class C

[felixmulder]

Seems to be classpath issues from discussion in meeting.

[DarkDimius]

I'm pretty sure this is due to classpath pollution.