The Coq Proof Assistant

# Library Coq.extraction.ExtrHaskellNatInt

Extraction of nat into Haskell's Int
Require Coq.extraction.Extraction.
Require Import Arith.
Require Import ExtrHaskellNatNum.

# Disclaimer: trying to obtain efficient certified programs

# by extracting nat into Int is definitively *not* a good idea.

# See comments in ExtrOcamlNatInt.v.

Extract Inductive nat => "Prelude.Int" [ "0" "Prelude.succ" ]
"(\fO fS n -> if n Prelude.== 0 then fO () else fS (n Prelude.- 1))".