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huffman 8.5.0 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                 8.13.2      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.08.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.08.1      Official release 4.08.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.3       A library manager for OCaml
zarith              1.12        Implements arithmetic and logical operations over arbitrary-precision integers
# opam file:
opam-version: "2.0"
maintainer: "matej.kosik@inria.fr"
homepage: "https://github.com/coq-contribs/huffman"
license: "LGPL 2"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Huffman"]
depends: [
  "ocaml"
  "coq" {>= "8.5" & < "8.6~"}
]
tags: [ "keyword:data compression" "keyword:code" "keyword:huffman tree" "category:Computer Science/Decision Procedures and Certified Algorithms/Correctness proofs of algorithms" "category:Miscellaneous/Extracted Programs/Combinatorics" "date:2003-10" ]
authors: [ "Laurent Théry <>" ]
bug-reports: "https://github.com/coq-contribs/huffman/issues"
dev-repo: "git+https://github.com/coq-contribs/huffman.git"
synopsis: "A correctness proof of Huffman algorithm"
description: """
This directory contains the proof of correctness of Huffman algorithm
as described in:
David A. Huffman,
"A Method for the Construction of Minimum-Redundancy Codes,"
Proc. IRE, pp. 1098-1101, September 1952."""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/huffman/archive/v8.5.0.tar.gz"
  checksum: "md5=24c177433fec3608f741355cbf411486"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-huffman.8.5.0 coq.8.13.2

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.13.2).
The following dependencies couldn't be met:
  - coq-huffman -> coq < 8.6~ -> 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-huffman.8.5.0
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