Question: The following Scala function is tail-recursive: def f [X] (xs:List[X], ys:List[X]) : List[X] = { xs match { case Nil => ys case z::zs =>

The following Scala function is tail-recursive:

def f [X] (xs:List[X], ys:List[X]) : List[X] = { xs match { case Nil => ys case z::zs => f (zs, z::ys) } }

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