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(** Extraction of [nat] into Haskell's [Integer] *)
Require Import Arith.
Require Import ExtrHaskellNatNum.
(**
* Disclaimer: trying to obtain efficient certified programs
* by extracting [nat] into [Integer] isn't necessarily a good idea.
* See comments in [ExtrOcamlNatInt.v].
*)
Extract Inductive nat => "Prelude.Integer" [ "0" "Prelude.succ" ]
"(\fO fS n -> if n Prelude.== 0 then fO () else fS (n Prelude.- 1))".
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