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legacy-ring 8.6.0 Not compatible 👼

Context

# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
base-num            base        Num library distributed with the OCaml compiler
base-threads        base
base-unix           base
camlp5              7.14        Preprocessor-pretty-printer of OCaml
conf-findutils      1           Virtual package relying on findutils
conf-perl           2           Virtual package relying on perl
coq                 8.5.2       Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.04.2      The OCaml compiler (virtual package)
ocaml-base-compiler 4.04.2      Official 4.04.2 release
ocaml-config        1           OCaml Switch Configuration
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "https://github.com/coq-contribs/legacy-ring"
license: "Unknown"
build: [make]
install: [make "install"]
depends: [
  "ocaml"
  "coq" {>= "8.6" & < "8.7~"}
]
tags: [ "date: 1998-5" ]
authors: [ "Patrick Loiseleur" ]
bug-reports: "https://github.com/coq-contribs/legacy-ring/issues"
dev-repo: "git+https://github.com/coq-contribs/legacy-ring.git"
synopsis: "The former implementation of the ring tactic"
description: """
Tactics to decide equality and simplify polynomial
expressions over an arbitrary commutative ring. This generalizes a
previous tactics by Samuel Boutin."""
url {
  src: "https://github.com/coq-contribs/legacy-ring/archive/v8.6.0.tar.gz"
  checksum: "md5=6c54ffd5bf1e4f816c5d404ca87d079b"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-legacy-ring.8.6.0 coq.8.5.2

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.5.2).
The following dependencies couldn't be met:
  - coq-legacy-ring -> coq >= 8.6 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-legacy-ring -> coq >= 8.6 -> coq-core -> ocaml >= 4.09.0
      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-legacy-ring.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