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bignums 8.6.0 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                 8.13.0      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           1.9.5       A library manager for OCaml
zarith              1.12        Implements arithmetic and logical operations over arbitrary-precision integers
# opam file:
opam-version: "2.0"
maintainer: "pierre.letouzey@inria.fr"
homepage: "https://github.com/coq/bignums"
dev-repo: "git+https://github.com/coq/bignums.git"
bug-reports: "https://github.com/coq/bignums/issues"
authors: [
  "Laurent Théry"
  "Benjamin Grégoire"
  "Arnaud Spiwack"
  "Evgeny Makarov"
  "Pierre Letouzey"
]
license: "LGPL-2.1-only"
build: [
  [make "-j%{jobs}%" {ocaml:version >= "4.06"}]
]
install: [
  [make "install"]
]
depends: [
  "ocaml"
  "coq" {>= "8.6" & < "8.7~"}
]
tags: [
  "keyword:integer numbers"
  "keyword:rational numbers"
  "keyword:arithmetic"
  "keyword:arbitrary-precision"
  "category:Miscellaneous/Coq Extensions"
  "category:Mathematics/Arithmetic and Number Theory/Number theory"
  "category:Mathematics/Arithmetic and Number Theory/Rational numbers"
  "date:2017-06-15"
  "logpath:Bignums"
]
synopsis: "Bignums, the Coq library of arbitrary large numbers"
description:
  "Provides BigN, BigZ, BigQ that used to be part of Coq standard library < 8.7."
url {
  src: "https://github.com/coq/bignums/archive/v8.6.0.tar.gz"
  checksum: "md5=8200a64b50404a7f952e5ddd8047f646"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-bignums.8.6.0 coq.8.13.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.13.0).
The following dependencies couldn't be met:
  - coq-bignums -> coq < 8.7~ -> 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-bignums.8.6.0
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