File: function-argument1.fut

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-- Simple polymorphic higher-order function that takes a function as argument.
-- ==
-- input { 11 true } output { 44 true }
-- input { 7 false } output { 28 false }

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

def double (x : i32) : i32 = x+x
def not (b : bool) : bool = ! b

def main (x : i32) (b : bool) : (i32, bool) = (twice double x, twice not b)