transfer/examples/fib.tr


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import nat

fib : Int -> Int
fib 0 = 1
fib 1 = 1
fib n = fib (n-1) + fib (n-2)

fibNat : Nat -> Nat
fibNat Zero = Succ Zero
fibNat (Succ Zero) = Succ Zero
fibNat (Succ (Succ n)) = plus (fibNat (Succ n)) (fibNat n)