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higman-cf 8.9.0 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
coq                 8.12.1      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.09.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.09.1      Official release 4.09.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.3       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "https://github.com/coq-contribs/higman-cf"
license: "LGPL 2.1"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/HigmanCF"]
depends: [
  "ocaml"
  "coq" {>= "8.9" & < "8.10~"}
]
tags: [
  "keyword: Higman's lemma"
  "keyword: extraction"
  "category: Mathematics/Combinatorics and Graph Theory"
  "category: Miscellaneous/Extracted Programs/Combinatorics"
]
authors: [
  "Stefan Berghofer"
]
bug-reports: "https://github.com/coq-contribs/higman-cf/issues"
dev-repo: "git+https://github.com/coq-contribs/higman-cf.git"
synopsis: "A direct constructive proof of Higman's Lemma"
description: """
This development formalizes in Coq the Coquand-Friedlender proof of
Higman's lemma for a two-letter alphabet.
An efficient program can be extracted from the proof."""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/higman-cf/archive/v8.9.0.tar.gz"
  checksum: "md5=1ce02b6135e92838aaf98fc5932274bf"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-higman-cf.8.9.0 coq.8.12.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.12.1).
The following dependencies couldn't be met:
  - coq-higman-cf -> coq < 8.10~ -> ocaml < 4.06.0
      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-higman-cf.8.9.0
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