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concurrency-system 1.1.0 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                 8.9.0       Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.04.2      The OCaml compiler (virtual package)
ocaml-base-compiler 4.04.2      Official 4.04.2 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "dev@clarus.me"
homepage: "https://github.com/coq-concurrency/system"
dev-repo: "git+https://github.com/coq-concurrency/system.git"
bug-reports: "https://github.com/coq-concurrency/system/issues"
authors: ["Guillaume Claret"]
license: "MIT"
build: [
  ["ruby" "pp.rb"]
  ["./configure.sh"]
  [make "-j%{jobs}%"]
]
install: [
  [make "install"]
]
depends: [
  "ocaml"
  "conf-ruby" {build}
  "coq" {>= "8.4pl4" & < "8.6"}
  "coq-error-handlers"
  "coq-function-ninjas"
  "coq-list-string" {>= "2.0.0"}
]
tags: [
  "date:2015-11-26"
  "keyword:effects"
  "keyword:extraction"
]
synopsis: "Experimental library to write concurrent applications in Coq"
url {
  src: "https://github.com/coq-concurrency/system/archive/1.1.0.tar.gz"
  checksum: "md5=ac9441be42d767e1c9d22b487b4ce791"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-concurrency-system.1.1.0 coq.8.9.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.9.0).
The following dependencies couldn't be met:
  - coq-concurrency-system -> coq < 8.6 -> 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-concurrency-system.1.1.0
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