Scala scope

f.scala

/** Return the square of all positive numbers in x
  * which are also present in y.
  */
def f(x: List[Int], y: List[Int]): List[Int] = {
  val filtered = {
    val iny = x.filter(v => y.contains(v))
    val pos = iny.filter(_ > 0)
    pos
  }
  
  // iny.map(x => x * x) <- Won't compile.
  
  filtered.map(x => x * x)
}