oli-kitty
/ recursionschemescategorically.worksheet.sc
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April 12, 2020 17:35
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| sealed trait Expr | |
| case class Const(d: Double) extends Expr | |
| case class Var(a: String) extends Expr | |
| case class Times(l: Expr, r: Expr) extends Expr | |
| case class Plus(l: Expr, r: Expr) extends Expr |