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class MailBox {
class Message
//type Message = AnyRef
}
abstract class Actor {
private val in = new MailBox
def send(msg: in.Message) = error("foo")
def unstable: Actor = error("foo")
def dubiousSend(msg: MailBox#Message): Nothing =
unstable.send(msg) // in.Message becomes unstable.Message, but that's ok since Message is a concrete type member
}
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