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- // A base class for all expressions.
- sealed trait Expr
- // Arithmetic expressions.
- case class Num(n: Integer) extends Expr
- case class Plus(e1: Expr, e2: Expr) extends Expr
- case class Minus(e1: Expr, e2: Expr) extends Expr
- case class Times(e1: Expr, e2: Expr) extends Expr
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