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io-system-ocaml 2.3.1 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
conf-gmp              4           Virtual package relying on a GMP lib system installation
coq                   8.16.0      Formal proof management system
dune                  3.13.0      Fast, portable, and opinionated build system
ocaml                 4.13.1      The OCaml compiler (virtual package)
ocaml-base-compiler   4.13.1      Official release 4.13.1
ocaml-config          2           OCaml Switch Configuration
ocaml-options-vanilla 1           Ensure that OCaml is compiled with no special options enabled
ocamlfind             1.9.6       A library manager for OCaml
zarith                1.13        Implements arithmetic and logical operations over arbitrary-precision integers
# opam file:
opam-version: "2.0"
maintainer: "dev@clarus.me"
homepage: "https://github.com/clarus/io-system-ocaml"
dev-repo: "git+https://github.com/clarus/io-system-ocaml.git"
bug-reports: "https://github.com/clarus/io-system-ocaml/issues"
authors: ["Guillaume Claret"]
license: "MIT"
build: [
  [make "-j%{jobs}%"]
]
install: [
  [make "install"]
]
depends: [
  "lwt" {>= "2.4.7" & < "5"}
  "ocaml" {>= "4.02.0"}
  "ocamlbuild" {build}
  "ocamlfind" {build}
  "num"
]
conflicts: [
  "ocaml-secondary-compiler"
]
tags: [
  "date:2019-07-25"
  "keyword:effects"
  "keyword:extraction"
]
synopsis: "Extraction to OCaml of system effects"
url {
  src: "https://github.com/coq-io/system-ocaml/archive/2.3.1.tar.gz"
  checksum: "sha512=4914cc5bbf45d3bae178dd9514131994f0be35d8ae77fd18b55db91de36812f7bac3570a2001e5ed9ccf695f296909a92cf4cc1c8c0283768aa9d187754688c4"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-io-system-ocaml.2.3.1 coq.8.16.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.16.0).
The following dependencies couldn't be met:
  - coq-io-system-ocaml -> lwt < 5 -> ocaml < 4.12
      base of this switch (use `--unlock-base' to force)
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-io-system-ocaml.2.3.1
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