File: function-argument2.fut

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-- Polymorphic higher-order function with an argument lambda that
-- closes over a local variable.
-- ==
-- input { 5 true } output { 7 }
-- input { 5 false } output { 9 }

def twice 'a (f : a -> a) (x : a) : a = f (f x)

def main (x : i32) (b : bool) : i32 =
  twice (\(y:i32) -> if b then y+1 else y+2) x