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higman-s 8.6.0 Not compatible 👼

Context

# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
base-threads        base
base-unix           base
camlp5              7.14        Preprocessor-pretty-printer of OCaml
conf-findutils      1           Virtual package relying on findutils
conf-perl           1           Virtual package relying on perl
coq                 8.7.1+2     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           1.9.1       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "https://github.com/coq-contribs/higman-s"
license: "LGPL"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/HigmanS"]
depends: [
  "ocaml"
  "coq" {>= "8.6" & < "8.7~"}
]
tags: [ "keyword: Higman's lemma" "keyword: well quasi-ordering" "category: Mathematics/Combinatorics and Graph Theory" "date: 2007-09-14" ]
authors: [ "William Delobel <william.delobel@lif.univ-mrs.fr>" ]
bug-reports: "https://github.com/coq-contribs/higman-s/issues"
dev-repo: "git+https://github.com/coq-contribs/higman-s.git"
synopsis: "Higman's lemma on an unrestricted alphabet"
description:
  "This proof is more or less the proof given by Monika Seisenberger in \"An Inductive Version of Nash-Williams' Minimal-Bad-Sequence Argument for Higman's Lemma\"."
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/higman-s/archive/v8.6.0.tar.gz"
  checksum: "md5=16dee76d75e5bb21e16f246c52272afc"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-higman-s.8.6.0 coq.8.7.1+2

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.7.1+2).
The following dependencies couldn't be met:
  - coq-higman-s -> 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-higman-s.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