progs/app02.scala
author Christian Urban <christian.urban@kcl.ac.uk>
Fri, 22 Jan 2021 10:39:04 +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