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cours-de-coq 8.9.0 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
camlp4              4.03+1       Camlp4 is a system for writing extensible parsers for programming languages
conf-findutils      1            Virtual package relying on findutils
conf-which          1            Virtual package relying on which
coq                 8.5.0~camlp4 Formal proof management system
num                 0            The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.03.0       The OCaml compiler (virtual package)
ocaml-base-compiler 4.03.0       Official 4.03.0 release
ocaml-config        1            OCaml Switch Configuration
ocamlbuild          0.14.2       OCamlbuild is a build system with builtin rules to easily build most OCaml projects
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "https://github.com/coq-contribs/cours-de-coq"
license: "Unknown"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/CoursDeCoq"]
depends: [
  "ocaml"
  "coq" {>= "8.9" & < "8.10~"}
]
tags: [
  "category: Miscellaneous/Coq Use Examples"
]
authors: [
  "Frédéric Prost"
  "Gilles Kahn"
]
bug-reports: "https://github.com/coq-contribs/cours-de-coq/issues"
dev-repo: "git+https://github.com/coq-contribs/cours-de-coq.git"
synopsis: "Various examples of Coq proofs"
description: """
Various simple examples of Coq proofs"""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/cours-de-coq/archive/v8.9.0.tar.gz"
  checksum: "md5=d73f73beb897c1a809c787ba33eacdf0"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-cours-de-coq.8.9.0 coq.8.5.0~camlp4

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.5.0~camlp4).
The following dependencies couldn't be met:
  - coq-cours-de-coq -> coq >= 8.9 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-cours-de-coq -> coq >= 8.9 -> 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-cours-de-coq.8.9.0
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