@seanparsons case class Costate[A,B](t:A=>B,s:A);case class Lens[A,B](r:A=>Costate[B,A]);case class PLens[A,B](r:A=>Option[Costate[B,A]])
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@seanparsons case class Costate[A,B](t:A=>B,s:A);case class Lens[A,B](r:A=>Costate[B,A]);case class PLens[A,B](r:A=>Option[Costate[B,A]])