File: polymorphic6.fut

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-- Removing polymorphism with an ascription, but higher order!
-- ==
-- input { 2 } output { 2 }

module mk_m (P: {
  type t
  val f: t -> i32
}) = {
  def g (x: P.t) = P.f x
}

module m = mk_m {
  type t = (i32, i32)
  def f (x, _) = x
}

def main (x: i32) =
  m.g (x,x)