Library Coq.extraction.ExtrHaskellNatInteger

Extraction of nat into Haskell's Integer

Require Coq.extraction.Extraction.

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))".