File: function-argument0.fut

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-- Simple monomorphic higher-order function that takes a function as argument.
-- ==
-- input { 3 } output { 5 12 }
-- input { 16 } output {18 64 }

def twice (f : i32 -> i32) (x : i32) : i32 = f (f x)

def double (x : i32) : i32 = x+x
def add1 (x : i32) : i32 = x+1

def main (x : i32) : (i32, i32) = (twice add1 x, twice double x)