def dropWhile[A](l: List[A], f: A => Boolean): List[A] =
l match {
case Cons(h, t) if f(h) => dropWhile(t, f)
case _ => l
}
dropWhile(Nil, (x: Int) => x > 0)
sealed trait List[+A]
case object Nil extends List[Nothing]
case class Cons[+A](head: A, tail: List[A]) extends List[A]
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