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sealed trait ModelNode { type Result } sealed trait RealNode { final type Result = Double } def eval(m: ModelNode): m.Result = m match { case m1: RealNode => implicitly[m.type =:= m1.type] 0.0 }
Should compile. Both 0.0 : m.Result and implicitly[m.type =:= m1.type].
0.0 : m.Result
implicitly[m.type =:= m1.type]