implicit list as functor

gistfile1.scala

trait Functor[A, T[_]] {
    def fmap[B](f: A => B): T[B]
}

class ListFunctor[A](val list: List[A]) extends Functor[A, List] {
    override def fmap[B](f: A => B): List[B] = list match {
      case List() => List()
      case (x :: xs) => f(x) :: xs.fmap(f)
    }
}
implicit def listToFunctor[A](list: List[A]): ListFunctor[A] = new ListFunctor(list)

/////////
List(1,2,3).fmap(_.toString)