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| sealed trait Caster[A, B] | |
| case object CastTo extends Caster[Unit, Unit] | |
| case class Ignored[A, B]() extends Caster[A, B] | |
| def cast[A, B]: A =:= B = | |
| (Ignored(): Caster[A, B]) match { | |
| case CastTo | _ => implicitly[B =:= Unit] | |
| } | |
| cast[String, Int]: String =:= Int |
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