unNone method on scala 2.13 collections

UnNone.scala

import scala.collection.generic.IsIterable
import scala.collection.{BuildFrom, IterableOps}
import scala.language.implicitConversions

// Пример для одной конкретной коллекции, рабочий
object ListUtils {
  implicit class ListOps[A](val self: List[A]) extends AnyVal {
    def unNone[B](implicit ev: A <:< Option[B]): List[B] = {
      ev.liftCo(self).collect {
        case Some(x) => x
      }
    }
  }
}


// Обобщенный для любой коллекции, у которой есть collect
object CollectionUtils {

  class CollectionOps[Repr, I <: IsIterable[Repr]](val coll: Repr, it: I) {
    def unNone[B, That](implicit ev: it.A <:< Option[B], bf: BuildFrom[Repr, B, That]): That = {
      type F[+A] = IterableOps[A, Iterable, it.C]
      val x: F[it.A] = it(coll)
      val res = ev.liftCo(x).collect {
        case Some(x) => x
      }

      bf.fromSpecific(coll)(res)
    }
  }

  implicit def toCollectionOps[Repr](coll: Repr)(implicit it: IsIterable[Repr]): CollectionOps[Repr, it.type] =
    new CollectionOps(coll, it)
}

object CollectionUtils2 {
  // упрощенный вариант от Олега:
  implicit class UnNoneOps[F[+x] <: IterableOps[x, F, F[x]], A](private val coll: F[A]) extends AnyVal {
    def unNone[B](implicit ev: A <:< Option[B]): F[B] = {
      ev.liftCo[F](coll).collect {
        case Some(x) => x
      }
    }
  }
}

import CollectionUtils._

val list = List(Some(1), None, Some(2))
val vector = Vector(Some(1), None, Some(2))
list.unNone
vector.unNone