package monocle.function import monocle.Lens import scala.annotation.implicitNotFound @implicitNotFound("Could not find an instance of Field3[${S},${A}], please check Monocle instance location policy to " + "find out which import is necessary") trait Field3[S, A] extends Serializable { /** Creates a Lens from S to it is third element */ def third: Lens[S, A] } object Field3 extends Field3Functions trait Field3Functions { def third[S, A](implicit ev: Field3[S, A]): Lens[S, A] = ev.third }