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euler-formula 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-ocamlbuild     base        OCamlbuild binary and libraries 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                 8.7.1+1     Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.02.3      The OCaml compiler (virtual package)
ocaml-base-compiler 4.02.3      Official 4.02.3 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "https://github.com/coq-contribs/euler-formula"
license: "LGPL"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/EulerFormula"]
depends: [
  "ocaml"
  "coq" {>= "8.9" & < "8.10~"}
]
tags: [
  "keyword: polyhedron"
  "keyword: hypermap"
  "keyword: genus"
  "keyword: Euler formula"
  "keyword: assisted proofs"
  "category: Mathematics/Geometry"
  "date: 2006-09"
]
authors: [
  "Jean-François Dufourd <dufourd@dpt-info.u-strasbg.fr> [http://dpt-info.u-strasbg.fr/~jfd/]"
]
bug-reports: "https://github.com/coq-contribs/euler-formula/issues"
dev-repo: "git+https://github.com/coq-contribs/euler-formula.git"
synopsis: "Hypermaps, Genus Theorem and Euler Formula"
description: """
This library formalizes the combinatorial hypermaps and their properties in a constructive way. It gives the proofs of the Genus Theorem and of the Euler Formula for the polyhedra."""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/euler-formula/archive/v8.9.0.tar.gz"
  checksum: "md5=29b59477a21a5771162759e5bd1d65dc"
}

Lint

Command
true
Return code
0

Dry install 🏜️

Dry install with the current Coq version:

Command
opam install -y --show-action coq-euler-formula.8.9.0 coq.8.7.1+1
Return code
5120
Output
[NOTE] Package coq is already installed (current version is 8.7.1+1).
The following dependencies couldn't be met:
  - coq-euler-formula -> coq >= 8.9 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-euler-formula -> 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-euler-formula.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