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sealed trait Message[+A]
class Script[A] extends Message[A] {
def iterator: Iterator[Message[A]] = ???
}
trait Test4[A] {
def f(cmd: Message[A]): Iterator[A] = cmd match { case s: Script[t] => s.iterator flatMap f }
def g(cmd: Message[A]) = cmd match { case s: Script[t] => s }
}
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