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nfix 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                   dev         Formal proof management system
dune                  3.1.1       Fast, portable, and opinionated build system
ocaml                 4.13.1      The OCaml compiler (virtual package)
ocaml-base-compiler   4.13.1      Official release 4.13.1
ocaml-config          2           OCaml Switch Configuration
ocaml-options-vanilla 1           Ensure that OCaml is compiled with no special options enabled
ocamlfind             1.9.3       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/nfix"
license: "Proprietary"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Nfix"]
depends: [
  "ocaml"
  "coq" {>= "8.5" & < "8.6~"}
]
tags: [ "keyword:mutual fixpoint functions" "category:Miscellaneous/Coq Extensions" ]
authors: [ "Stéphane Lescuyer <>" ]
bug-reports: "https://github.com/coq-contribs/nfix/issues"
dev-repo: "git+https://github.com/coq-contribs/nfix.git"
synopsis: "Nfix: a Coq extension for fixpoints on nested inductives"
description:
  "This plugin provides a syntactic extension that allows one to write mutual fixpoints over nested inductives."
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/nfix/archive/v8.5.0.tar.gz"
  checksum: "md5=51342658a19147f3d4eb8f3e005ac475"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-nfix.8.5.0 coq.dev

Return code

5120

Output

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