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firing-squad 8.7.0 Not compatible 👼

Context

# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
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                 8.9.1       Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.06.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.06.1      Official 4.06.1 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/firing-squad"
license: "LGPL 2.1"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/FiringSquad"]
depends: [
  "coq" {>= "8.7" & < "8.8~"}
  "ocaml" {< "4.09"}
]
tags: [ "keyword: concurrency" "keyword: synchronization" "keyword: finite-state machines" "category: Computer Science/Concurrent Systems and Protocols/Correctness of specific protocols" "category: Miscellaneous/Extracted Programs/Automata and protocols" ]
authors: [ "Jean Duprat" ]
bug-reports: "https://github.com/coq-contribs/firing-squad/issues"
dev-repo: "git+https://github.com/coq-contribs/firing-squad.git"
synopsis: "Firing Squad Synchronization Problem"
description: """
This contribution is a formal verification of a solution
of the firing squad synchronization problem."""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/firing-squad/archive/v8.7.0.tar.gz"
  checksum: "md5=e191bd0a64364c862d1b09472000d15b"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-firing-squad.8.7.0 coq.8.9.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.9.1).
The following dependencies couldn't be met:
  - coq-firing-squad -> coq < 8.8~ -> 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-firing-squad.8.7.0
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