Extend existing companion object

Extend.scala

implicit class FutureCompanionOps(f: Future.type) extends AnyVal {
  def userInput(message: String): Future[String] = Future {
    readLine(message)
  }
}


class FutureCompanionOps(f: Future.type) extends AnyVal {
  def userInput(message: String): Future[String] = Future {
    readLine(message)
  }
}
implicit def f2ops(f: Future.type) = new FutureCompanionOps(f)