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trait Lang1 {
trait Exp
trait Visitor { def f(left: Exp): Unit }
class Eval1 extends Visitor { self =>
def f(left: Exp) = ()
}
}
trait Lang3 { self: Lang1 =>
class Visitor extends Eval1 { Visitor => // error: classes cannot be overridden
}
}
trait Lang4 extends Lang1 with Lang3
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