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mtac2 1.4+8.15 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
coq                 8.11.0      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.06.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.06.1      Official 4.06.1 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.5       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "beta.ziliani@gmail.com"
homepage: "https://github.com/Mtac2/Mtac2"
dev-repo: "git+https://github.com/Mtac2/Mtac2.git"
bug-reports: "https://github.com/Mtac2/Mtac2/issues"
authors: ["Beta Ziliani <beta.ziliani@gmail.com>" "Jan-Oliver Kaiser <janno@mpi-sws.org>" "Robbert Krebbers <mail@robbertkrebbers.nl>" "Yann Régis-Gianas <yrg@pps.univ-paris-diderot.fr>" "Derek Dreyer <dreyer@mpi-sws.org>"]
license: "MIT"
build: [
  ["coq_makefile" "-f" "_CoqProject" "-o" "Makefile"]
  [make "-j%{jobs}%"]
]
install: [
  [make "install"]
]
depends: [
  "ocaml"
  "coq" {>= "8.15" & < "8.16~"}
  "coq-unicoq" {>= "1.5" & < "2~"}
]
synopsis: "Mtac2: Typed Tactics for Coq"
tags: [
  "logpath:Mtac2"
  "date:2022-01-19"
]
url {
  src: "https://github.com/Mtac2/Mtac2/archive/v1.4-coq8.15.tar.gz"
  checksum: "sha512=1d07bd67b6f5dc6b63f248100e29e9071b330d07c938aa605a3244f53f49c55124f9857feab1284cf2f92893d0f6fe2507ea14e5a7908b93508ff660c8bdf887"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-mtac2.1.4+8.15 coq.8.11.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.11.0).
The following dependencies couldn't be met:
  - coq-mtac2 -> coq >= 8.15 -> 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-mtac2.1.4+8.15
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