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propcalc 8.9.0 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           1           Virtual package relying on perl
coq                 8.7.1+2     Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.09.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.09.1      Official release 4.09.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.1       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "http://arxiv.org/abs/1503.08744"
license: "BSD"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/PropCalc"]
depends: [
  "ocaml"
  "coq" {>= "8.9" & < "8.10~"}
]
tags: [
  "keyword: propositional calculus"
  "keyword: classical logic"
  "keyword: completeness"
  "keyword: natural deduction"
  "keyword: sequent calculus"
  "keyword: cut elimination"
  "category: Mathematics/Logic/Foundations"
]
authors: [
  "Floris van Doorn <fpvdoorn@gmail.com> [http://www.contrib.andrew.cmu.edu/~fpv/]"
]
bug-reports: "https://github.com/coq-contribs/propcalc/issues"
dev-repo: "git+https://github.com/coq-contribs/propcalc.git"
synopsis: "Propositional Calculus"
description: """
Formalization of basic theorems about classical propositional logic. The main theorems are (1) the soundness and completeness of natural deduction calculus, (2) the equivalence between natural deduction calculus, Hilbert systems and sequent calculus and (3) cut elimination for sequent calculus."""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/propcalc/archive/v8.9.0.tar.gz"
  checksum: "md5=026cadcf7d43c7ed9212266633005efd"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-propcalc.8.9.0 coq.8.7.1+2

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.7.1+2).
The following dependencies couldn't be met:
  - coq-propcalc -> coq >= 8.9
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-propcalc.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