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mod-red 8.6.0 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                   8.13.1      Formal proof management system
num                   1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml                 4.12.1      The OCaml compiler (virtual package)
ocaml-base-compiler   4.12.1      Official release 4.12.1
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: "Hugo.Herbelin@inria.fr"
homepage: "https://github.com/coq-contribs/mod-red"
license: "GNU Lesser General Public License"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/ModRed"]
depends: [
  "ocaml"
  "coq" {>= "8.6" & < "8.7~"}
]
tags: [ "keyword: Algorithms" "keyword: Performance" "keyword: Computer Arithmetic" "keyword: Modular Reduction" "keyword: Optimization" "category: Mathematics/Arithmetic and Number Theory/Miscellaneous" "date: 2007-12; Updated in April 2009" ]
authors: [ "Luc Rutten" ]
bug-reports: "https://github.com/coq-contribs/mod-red/issues"
dev-repo: "git+https://github.com/coq-contribs/mod-red.git"
synopsis: "Efficient Reduction of Large Integers by Small Moduli"
description:
  "Fast reduction of integers by moduli up to 2^(w-1), where w is a processor's word size."
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/mod-red/archive/v8.6.0.tar.gz"
  checksum: "md5=9ba9cc5fa8083b558fbcbd3000a691f5"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-mod-red.8.6.0 coq.8.13.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.13.1).
The following dependencies couldn't be met:
  - coq-mod-red -> coq < 8.7~ -> ocaml < 4.06.0
      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-mod-red.8.6.0
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