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coqoban 8.9.0 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
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                 8.5.2       Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.03.0      The OCaml compiler (virtual package)
ocaml-base-compiler 4.03.0      Official 4.03.0 release
ocaml-config        1           OCaml Switch Configuration
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "https://github.com/coq-contribs/coqoban"
license: "LGPL 2.1"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Coqoban"]
depends: [
  "ocaml"
  "coq" {>= "8.9" & < "8.10~"}
]
tags: [
  "keyword: Sokoban"
  "keyword: puzzles"
  "category: Miscellaneous/Logical Puzzles and Entertainment"
  "date: 2003-09-19"
]
authors: [
  "Jasper Stein"
]
bug-reports: "https://github.com/coq-contribs/coqoban/issues"
dev-repo: "git+https://github.com/coq-contribs/coqoban.git"
synopsis: "Coqoban (Sokoban)"
description: """
A Coq implementation of Sokoban, the Japanese warehouse
keepers' game"""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/coqoban/archive/v8.9.0.tar.gz"
  checksum: "md5=3948073ba0227d55d5d4c8956d0cbe7e"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-coqoban.8.9.0 coq.8.5.2

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.5.2).
The following dependencies couldn't be met:
  - coq-coqoban -> coq >= 8.9 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-coqoban -> coq >= 8.9 -> coq-core -> ocaml >= 4.09.0
      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-coqoban.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