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euler-formula 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                 8.13.2      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.11.2      The OCaml compiler (virtual package)
ocaml-base-compiler 4.11.2      Official release 4.11.2
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.5       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/euler-formula"
license: "LGPL"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/EulerFormula"]
depends: [
  "ocaml"
  "coq" {>= "8.5" & < "8.6~"}
]
tags: [
  "keyword:polyhedron"
  "keyword:hypermap"
  "keyword:genus"
  "keyword:Euler formula"
  "keyword:assisted proofs"
  "category:Mathematics/Geometry/General"
  "date:2006-09"
]
authors: [ "Jean-François Dufourd <dufourd@dpt-info.u-strasbg.fr>" ]
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/v8.5.0.tar.gz"
  checksum: "md5=73cf542be149fa026d54a1126df1fe66"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-euler-formula.8.5.0 coq.8.13.2

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.13.2).
The following dependencies couldn't be met:
  - coq-euler-formula -> coq < 8.6~ -> 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-euler-formula.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