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coinduction 1.6 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                 8.5.3       Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.03.0      The OCaml compiler (virtual package)
ocaml-base-compiler 4.03.0      Official 4.03.0 release
ocaml-config        1           OCaml Switch Configuration
# opam file:
opam-version: "2.0"
maintainer: "damien.pous@ens-lyon.fr"
homepage: "https://github.com/damien-pous/coinduction"
dev-repo: "git+https://github.com/damien-pous/coinduction.git"
bug-reports: "https://github.com/damien-pous/coinduction/issues"
license: "LGPL-3.0-or-later"
synopsis: "A library and plugin for doing proofs by (enhanced) coinduction"
description: """
Coinductive predicates are greatest fixpoints of monotone functions.
The `companion' makes it possible to enhance the associated coinduction scheme.
This library provides a formalisation on enhancements based on the companion, as well as tactics in making it straightforward to perform proofs by enhanced coinduction.
"""
build: [
  [make "-j%{jobs}%" ]
]
install: [make "install"]
depends: [
  "ocaml"
  "coq" {>= "8.16"}
]
tags: [
  "keyword:coinduction"
  "keyword:up to techniques"
  "keyword:companion"
  "logpath:Coinduction"
]
authors: [
  "Damien Pous"
]
url {
  src:
    "https://github.com/damien-pous/coinduction/archive/v1.6.tar.gz"
    checksum: "sha512=dd1ef575fe02377d21f13ceedbc102301164fb9f2c091cedeb6d1cd5b5d24d0d521919fac62c2f37f8b1cf249f8f5d37f9ce78ab886c8f834ee98c353dc558c3"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-coinduction.1.6 coq.8.5.3

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.5.3).
The following dependencies couldn't be met:
  - coq-coinduction -> coq >= 8.16 -> ocaml >= 4.09.0
      base of this switch (use `--unlock-base' to force)
  - coq-coinduction -> coq >= 8.16 -> 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-coinduction.1.6
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