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yalla 2.0.1 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           2           Virtual package relying on perl
coq                 8.9.1       Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.06.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.06.1      Official 4.06.1 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.5       A library manager for OCaml
# opam file:
opam-version: "2.0"
synopsis: "Yalla library"
description: """
  YALLA: an LL library for Coq
  Yet Another deep embedding of Linear Logic in Coq
"""
homepage: "https://perso.ens-lyon.fr/olivier.laurent/yalla/"
dev-repo: "git+https://github.com/olaure01/yalla.git"
bug-reports: "https://github.com/olaure01/yalla/issues"
doc: "https://perso.ens-lyon.fr/olivier.laurent/yalla/"
maintainer: "olivier.laurent@ens-lyon.fr"
authors: [
  "Olivier Laurent"
]
license: "LGPL-3.0-or-later"
depends: [
  "coq" { >= "8.12" & < "8.13" }
]
build: [
  ["./configure"]
  [make "-j%{jobs}%"]
]
install: [
  [make "install"]
]
url {
  src: "https://github.com/olaure01/yalla/archive/v2.0.1.tar.gz"
  checksum: "sha256=e9239fb82cfe32374fbf58d69850fe8c5d189f5d2a814175b606bd6b487a0d9b"
}
tags: [
  "keyword:linear logic"
  "keyword:metatheory"
  "keyword:cut elimination"
  "category:Mathematics/Logic/Foundations"
  "date:2020-08-07"
  "logpath:Yalla"
]

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-yalla.2.0.1 coq.8.9.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.9.1).
The following dependencies couldn't be met:
  - coq-yalla -> coq >= 8.12 -> 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-yalla.2.0.1
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