ClassCastException during pattern match on inner classes defined in base traits #3548
Description
The following code crashes with a ClassCastException:
trait Common {
case class Data(a: String)
}
object O1 extends Common
object O2 extends Common
val data = O2.Data("test")
// Runtime error: java.lang.ClassCastException: O2$ cannot be cast to O1$
data match {
case O1.Data(s) => println("O1 data")
case O2.Data(s) => println("O2 data")
case _ => println("Unknown")
}(Observed on 0.4.0-RC1)