Fixed Point Combinator

Combinator.scala

//This is as close as I've come thus far, but it cheats. :(

object Combinator {
  
  def main(args:Array[String]):Unit = {
    lazy val y:((Int => Int) => (Int => Int)) => (Int => Int) = g => g(y(g))(_)
    val error:(Int => Int) = n => throw new java.lang.Exception("OOPS")
    val fp:((Int => Int) => (Int => Int)) = f => n => if (n == 0) 1 else n * f(n - 1)
    
    println(y(fp)(10))
  }
}