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relation-algebra 1.6 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                 8.7.1       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: "Damien Pous <Damien.Pous@ens-lyon.fr>"
homepage: "http://perso.ens-lyon.fr/damien.pous/ra/"
license: "LGPL"
build: [
  ["coq_makefile" "-f" "Make" "-o" "Makefile"]
  [make "-j%{jobs}%"]
]
install: [make "install"]
depends: [
  "ocaml"
  "coq" {>= "8.5.1" & < "8.6~" & != "8.5.2~camlp4"}
]
tags: [
  "keyword:relation algebra"
  "keyword:Kleene algebra with tests"
  "keyword:KAT"
  "keyword:allegories"
  "keyword:residuated structures"
  "keyword:automata"
  "keyword:regular expressions"
  "keyword:matrices"
  "category:Mathematics/Algebra"
  "logpath:RelationAlgebra"
]
authors: [ "Damien Pous <Damien.Pous@ens-lyon.fr>" ]
synopsis: "Relation Algebra and KAT"
description:
  "A modular library about relation algebra, from idempotent semirings to residuated Kleene allegories, including a decision tactic for Kleene algebra with Tests (KAT)."
url {
  src: "https://github.com/damien-pous/relation-algebra/archive/v1.6.tar.gz"
  checksum: "md5=028c37f7e4607d220d6e054cb0428273"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-relation-algebra.1.6 coq.8.7.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.7.1).
The following dependencies couldn't be met:
  - coq-relation-algebra -> 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-relation-algebra.1.6
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