Why does scala.util.Failure have a type parameter?

Question

scala.util.Failure is declared like this:

final case class Failure[+T](exception: Throwable) extends Try[T]`

It takes a type p

Answer 1

The T in Failure[+T] comes in handy when trying to recover from the failure: recover[U >: T](rescueException: PartialFunction[Throwable, U]): Try[U]