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schroeder 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                 dev         Formal proof management system
dune                3.0.3       Fast, portable, and opinionated build system
ocaml               4.09.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.09.1      Official release 4.09.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.3       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/schroeder"
license: "LGPL 2"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Schroeder"]
depends: [
  "ocaml"
  "coq" {>= "8.5" & < "8.6~"}
]
tags: [ "keyword:schroeder bernstein" "keyword:set theory" "category:Mathematics/Logic/Set theory" ]
authors: [ "Hugo Herbelin <>" ]
bug-reports: "https://github.com/coq-contribs/schroeder/issues"
dev-repo: "git+https://github.com/coq-contribs/schroeder.git"
synopsis: "The Theorem of Schroeder-Bernstein"
description: """
Fraenkel's proof of Schroeder-Bernstein theorem on decidable sets
is formalized in a constructive variant of set theory based on
stratified universes (the one defined in the Ensemble library).
The informal proof can be found for instance in "Axiomatic Set Theory"
from P. Suppes."""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/schroeder/archive/v8.5.0.tar.gz"
  checksum: "md5=fbbc2b0f7c8106330dacc9f949f93bb5"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-schroeder.8.5.0 coq.dev

Return code

5120

Output

[NOTE] Package coq is already installed (current version is dev).
The following dependencies couldn't be met:
  - coq-schroeder -> coq < 8.6~ -> ocaml < 4.06.0
      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-schroeder.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