dmxlarchey / the-tortoise-and-the-hare

The Tortoise and the Hare in Coq. Constructive extraction via Bar inductive predicates (see README.md below).

The Tortoise and the Hare in Coq

    (**************************************************************)
    (*   Copyright Dominique Larchey-Wendling [*]                 *)
    (*                                                            *)
    (*                             [*] Affiliation LORIA -- CNRS  *)
    (**************************************************************)
    (*      This file is distributed under the terms of the       *)
    (*         CeCILL v2 FREE SOFTWARE LICENSE AGREEMENT          *)
    (**************************************************************)

What is this repository for

• This repository contains the Coq source code that comes as a companion to the paper Proof Pearl: Constructive Extraction of Cycle Finding Algorithms by Dominique Larchey-Wendling. The paper has been accepted for presentation at ITP 2018.

How do I set it up

• Use Coq 8.6 (preferably). The code also compiles with Coq 8.5pl[23]. But not under Coq 8.7 (see below).
• To compile, type make all. Then one can visit the individual proof files *.v
• Beware that Extraction will fail with Coq 8.7+ because Require Extraction should be included before extraction takes place. This is an unfortunate incompatibility introduced in Coq 8.7.
• If using Coq 8.7 is nonetheless important, the rest of the code should work ok, so simply add Require Extraction where it is needed.