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object Test extends App {
case class Number(i: Int)
object UnliftNumber {
def unapply(t: Any): Option[Number] = t match {
case i: Int => Some(Number(i))
case _ => None
}
}
def eval(expr: Any): Option[Number] = expr match {
case UnliftNumber(n) => Some(n)
case _ => None
}
println(eval(1))
}
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