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dblib 8.5.0 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
conf-findutils      1           Virtual package relying on findutils
coq                 8.12.1      Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.05.0      The OCaml compiler (virtual package)
ocaml-base-compiler 4.05.0      Official 4.05.0 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "matej.kosik@inria.fr"
homepage: "https://github.com/coq-contribs/dblib"
license: "GPL"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Dblib"]
depends: [
  "ocaml"
  "coq" {>= "8.5" & < "8.6~"}
]
tags: [
  "keyword:abstract syntax"
  "keyword:binders"
  "keyword:de Bruijn indices"
  "keyword:shift"
  "keyword:lift"
  "keyword:substitution"
  "category:Computer Science/Lambda Calculi"
]
authors: [ "Francois Pottier <francois.pottier@inria.fr>" ]
bug-reports: "https://github.com/coq-contribs/dblib/issues"
dev-repo: "git+https://github.com/coq-contribs/dblib.git"
synopsis: "Dblib"
description:
  "The dblib library offers facilities for working with de Bruijn indices."
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/dblib/archive/v8.5.0.tar.gz"
  checksum: "md5=da4c2319a576400536ba980c3c11b54d"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-dblib.8.5.0 coq.8.12.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.12.1).
The following dependencies couldn't be met:
  - coq-dblib -> 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-dblib.8.5.0
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