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bertrand 8.5.0 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
conf-gmp            4           Virtual package relying on a GMP lib system installation
coq                 8.15.1      Formal proof management system
dune                3.4.1       Fast, portable, and opinionated build system
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           1.9.5       A library manager for OCaml
zarith              1.12        Implements arithmetic and logical operations over arbitrary-precision integers
# opam file:
opam-version: "2.0"
maintainer: "matej.kosik@inria.fr"
homepage: "https://github.com/coq-contribs/bertrand"
license: "LGPL 2"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Bertrand"]
depends: [
  "ocaml"
  "coq" {>= "8.5" & < "8.6~"}
]
tags: [ "keyword:knuth's algorithm" "keyword:prime numbers" "keyword:bertrand's postulate" "category:Mathematics/Arithmetic and Number Theory/Number theory" "category:Computer Science/Decision Procedures and Certified Algorithms/Correctness proofs based on external tools" "category:Miscellaneous/Extracted Programs/Arithmetic" "date:2002" ]
authors: [ "Laurent Théry <>" ]
bug-reports: "https://github.com/coq-contribs/bertrand/issues"
dev-repo: "git+https://github.com/coq-contribs/bertrand.git"
synopsis: "Correctness of Knuth's algorithm for prime numbers"
description: """
A proof of correctness of the algorithm as described in
`The Art of Computer Programming: Fundamental Algorithms'
by Knuth, pages 147-149"""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/bertrand/archive/v8.5.0.tar.gz"
  checksum: "md5=d7ed1b44196c96be0b55fc4fb3967d74"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-bertrand.8.5.0 coq.8.15.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.15.1).
The following dependencies couldn't be met:
  - coq-bertrand -> coq < 8.6~ -> ocaml < 4.06.0
      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-bertrand.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