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stalmarck 8.15.0 Not compatible 👼

Context

# Packages matching: installed
# Name                # Installed # Synopsis
base-bigarray         base
base-threads          base
base-unix             base
conf-findutils        1           Virtual package relying on findutils
conf-gmp              4           Virtual package relying on a GMP lib system installation
coq                   8.16.1      Formal proof management system
dune                  3.12.1      Fast, portable, and opinionated build system
ocaml                 4.13.1      The OCaml compiler (virtual package)
ocaml-base-compiler   4.13.1      Official release 4.13.1
ocaml-config          2           OCaml Switch Configuration
ocaml-options-vanilla 1           Ensure that OCaml is compiled with no special options enabled
ocamlfind             1.9.6       A library manager for OCaml
zarith                1.13        Implements arithmetic and logical operations over arbitrary-precision integers
# opam file:
opam-version: "2.0"
maintainer: "palmskog@gmail.com"
homepage: "https://github.com/coq-community/stalmarck"
dev-repo: "git+https://github.com/coq-community/stalmarck.git"
bug-reports: "https://github.com/coq-community/stalmarck/issues"
license: "LGPL-2.1-or-later"
synopsis: "Verified implementation of Stålmarck's algorithm for proving tautologies in Coq"
description: """
A two-level approach to prove tautologies using Stålmarck's
algorithm in Coq."""
build: [make "-j%{jobs}%"]
install: [make "install"]
depends: [
  "coq" {>= "8.15" & < "8.16~"}
]
tags: [
  "category:Computer Science/Decision Procedures and Certified Algorithms/Decision procedures"
  "keyword:boolean formula"
  "keyword:tautology checker"
  "logpath:Stalmarck.Algorithm"
  "date:2022-09-16"
]
authors: [
  "Pierre Letouzey"
  "Laurent Théry"
]
url {
  src: "https://github.com/coq-community/stalmarck/archive/v8.15.0.tar.gz"
  checksum: "sha512=b8d27d4062c7541a1a45ec28e0b916cb7ba2ca6b444447005763db2a101ce8ef59bcef76ef475251e3059be5622806f451159b556af9fcacee3897e1bc0e4469"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-stalmarck.8.15.0 coq.8.16.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.16.1).
The following dependencies couldn't be met:
  - coq-stalmarck -> coq < 8.16~ -> ocaml < 4.12
      base of this switch (use `--unlock-base' to force)
Your request can't be satisfied:
  - No available version of coq satisfies the constraints
No solution found, exiting

Dry install without Coq/switch base, to test if the problem was incompatibility with the current Coq/OCaml version:

Command: opam remove -y coq; opam install -y --show-action --unlock-base coq-stalmarck.8.15.0
Return code: 0

Install dependencies

Command: true
Return code: 0
Duration: 0 s

Install 🚀

Command: true
Return code: 0
Duration: 0 s

Installation size

No files were installed.

Uninstall 🧹

Command: true
Return code: 0
Missing removes: none
Wrong removes: none