progs/app02.scala
author Christian Urban <urbanc@in.tum.de>
Thu, 14 Nov 2019 13:50:39 +0000
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abstract class Val
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case object Empty extends Val
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case class Chr(c: Char) extends Val
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case class Sequ(v1: Val, v2: Val) extends Val
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case class Left(v: Val) extends Val
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case class Right(v: Val) extends Val
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case class Stars(vs: List[Val]) extends Val