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hierarchy-builder 0.9.0 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
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                 8.9.1       Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.04.2      The OCaml compiler (virtual package)
ocaml-base-compiler 4.04.2      Official 4.04.2 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "Enrico Tassi <enrico.tassi@inria.fr>"
authors: [ "Cyril Cohen" "Kazuhiko Sakaguchi" "Enrico Tassi" ]
license: "MIT"
homepage: "https://github.com/math-comp/hierarchy-builder"
bug-reports: "https://github.com/math-comp/hierarchy-builder/issues"
dev-repo: "git+https://github.com/math-comp/hierarchy-builder"
build: [ make ]
install: [ make "install" "VFILES=structures.v" ]
depends: [
  "coq"      {>= "8.10.0" & < "8.12.0~" }
  "coq-elpi" {>= "1.3.0" & < "1.4.0~"}
  ]
synopsis: "Hierarchy Builder"
description: """
High level commands to declare and evolve a hierarchy based on packed classes.
"""
url {
  src: "https://github.com/math-comp/hierarchy-builder/archive/v0.9.0.tar.gz"
  checksum: "sha256=6eb4d51a1c66aeea8448f7c62b21a8603ccd025c00b9b62976c1e01278a6cd01"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-hierarchy-builder.0.9.0 coq.8.9.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.9.1).
The following dependencies couldn't be met:
  - coq-hierarchy-builder -> coq >= 8.10.0 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-hierarchy-builder -> coq >= 8.10.0 -> coq-core -> ocaml >= 4.09.0
      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-hierarchy-builder.0.9.0
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