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sudoku 8.16.0 Not compatible 👼

Context

# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
base-num            base        Num library distributed with the OCaml compiler
base-threads        base
base-unix           base
camlp5              7.14        Preprocessor-pretty-printer of OCaml
conf-findutils      1           Virtual package relying on findutils
conf-perl           2           Virtual package relying on perl
coq                 8.8.0       Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.03.0      The OCaml compiler (virtual package)
ocaml-base-compiler 4.03.0      Official 4.03.0 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "palmskog@gmail.com"
homepage: "https://github.com/coq-community/sudoku"
dev-repo: "git+https://github.com/coq-community/sudoku.git"
bug-reports: "https://github.com/coq-community/sudoku/issues"
license: "LGPL-2.1-or-later"
synopsis: "Sudoku solver certified in Coq"
description: """
A formalisation of Sudoku in Coq. It implements a naive
Davis-Putnam procedure to solve Sudokus."""
build: [make "-j%{jobs}%"]
install: [make "install"]
depends: [
  "coq" {>= "8.12" & < "8.17~"}
]
tags: [
  "category:Miscellaneous/Logical Puzzles and Entertainment"
  "keyword:puzzles"
  "keyword:Davis-Putnam"
  "keyword:sudoku"
  "logpath:Sudoku"
  "date:2022-10-19"
]
authors: [
  "Laurent Théry"
]
url {
  src: "https://github.com/coq-community/sudoku/archive/refs/tags/v8.16.0.tar.gz"
  checksum: "sha512=4d3c9f25218d48dd68df3db19d2b84f0d9f95eb96a3206627095b76cbdfb4a36a7492067743882769f0afd4fc73b935ebf4fa4301af04ba3f75aaaeea898c2d8"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-sudoku.8.16.0 coq.8.8.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.8.0).
The following dependencies couldn't be met:
  - coq-sudoku -> coq >= 8.12 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-sudoku -> coq >= 8.12 -> coq-core -> ocaml >= 4.09.0
      base of this switch (use `--unlock-base' to force)
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-sudoku.8.16.0
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