File: t0301.scala

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scala 2.11.12-6
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package fos

abstract class Expr
case class Var() extends Expr

object Analyzer {
  def substitution(expr: Expr, cls: (Var,Var)): Expr =
    expr match {
      case cls._2 => cls._1  // source of the error
      case _ => expr
    }
}