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checker 8.6.0 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
conf-findutils      1           Virtual package relying on findutils
coq                 8.10.0      Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.05.0      The OCaml compiler (virtual package)
ocaml-base-compiler 4.05.0      Official 4.05.0 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.5       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "https://github.com/coq-contribs/checker"
license: "LGPL 2.1"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Checker"]
depends: [
  "ocaml"
  "coq" {>= "8.6" & < "8.7~"}
]
tags: [ "keyword: checker" "keyword: dominos" "keyword: puzzles" "category: Miscellaneous/Logical Puzzles and Entertainment" ]
authors: [ "Gérard Huet" ]
bug-reports: "https://github.com/coq-contribs/checker/issues"
dev-repo: "git+https://github.com/coq-contribs/checker.git"
synopsis: "The Mutilated Checkerboard"
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/checker/archive/v8.6.0.tar.gz"
  checksum: "md5=09ba4e0ce0bb208f1436de0bf72b4244"
}

Lint

Command
true
Return code
0

Dry install 🏜️

Dry install with the current Coq version:

Command
opam install -y --show-action coq-checker.8.6.0 coq.8.10.0
Return code
5120
Output
[NOTE] Package coq is already installed (current version is 8.10.0).
The following dependencies couldn't be met:
  - coq-checker -> coq < 8.7~ -> ocaml < 4.03.0
      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-checker.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