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stalmarck 8.11.0 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           2           Virtual package relying on perl
coq                 8.9.0       Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.08.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.08.1      Official release 4.08.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "palmskog@gmail.com"
homepage: "https://github.com/coq-community/stalmarck"
dev-repo: "git+https://github.com/coq-community/stalmarck.git"
bug-reports: "https://github.com/coq-community/stalmarck/issues"
license: "LGPL-2.1-or-later"
synopsis: "Proof of Stålmarck's algorithm in Coq"
description: """
A two-level approach to prove tautologies using Stålmarck's algorithm in Coq.
"""
build: [make "-j%{jobs}%"]
install: [make "install"]
depends: [
  "ocaml"
  "coq" {>= "8.11" & < "8.12~"}
]
tags: [
  "category:Computer Science/Decision Procedures and Certified Algorithms/Decision procedures"
  "category:Miscellaneous/Extracted Programs/Decision procedures"
  "keyword:boolean formula"
  "keyword:tautology checker"
  "logpath:Stalmarck"
]
authors: [
  "Pierre Letouzey"
  "Laurent Théry"
]
url {
  src: "https://github.com/coq-community/stalmarck/archive/v8.11.0.tar.gz"
  checksum: "sha512=c7b18157bf231e47973ef9c00e0cfeef74f9433ebce9c023286a86a9bf123bbc1e1cc61240abc89d70ee792b547abe9aaba3f805de860c9bcefaa298d0b57826"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-stalmarck.8.11.0 coq.8.9.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.9.0).
The following dependencies couldn't be met:
  - coq-stalmarck -> coq >= 8.11 -> ocaml >= 4.09.0
      base of this switch (use `--unlock-base' to force)
  - coq-stalmarck -> coq >= 8.11 -> 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-stalmarck.8.11.0
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