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ext-lib 0.9.0 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
coq                 8.11.2      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.08.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.08.1      Official release 4.08.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.3       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "dev@clarus.me"
homepage: "https://github.com/coq-community/coq-ext-lib"
dev-repo: "git+https://github.com/coq-community/coq-ext-lib.git"
bug-reports: "https://github.com/coq-community/coq-ext-lib/issues"
authors: ["Gregory Malecha"]
license: "BSD-2-Clause-FreeBSD"
build: [
  [make "-j%{jobs}%"]
  ]
install: [
  [make "install"]
]
depends: [
  "ocaml"
  "coq" {>= "8.4pl4" & < "8.5~"}
]
synopsis: "A library of Coq definitions, theorems, and tactics"
url {
  src: "https://github.com/coq-community/coq-ext-lib/archive/v0.9.0.tar.gz"
  checksum: "md5=a4322811819b9bde918d5d7b48262ded"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-ext-lib.0.9.0 coq.8.11.2

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.11.2).
The following dependencies couldn't be met:
  - coq-ext-lib -> coq < 8.5~ -> ocaml < 4.03.0
      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-ext-lib.0.9.0
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