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fsets 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-m4             1           Virtual package relying on m4
coq                 8.10.0      Formal proof management system
num                 1.3         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           1.8.1       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "matej.kosik@inria.fr"
homepage: "https://github.com/coq-contribs/fsets"
license: "LGPL 2"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/FSets"]
depends: [
  "ocaml"
  "coq" {>= "8.5" & < "8.6~"}
]
tags: [ "keyword:finite sets" "keyword:sorted lists" "keyword:balanced trees" "keyword:red black trees" "keyword:avl" "keyword:functors" "keyword:data structures" "category:Computer Science/Data Types and Data Structures" "category:Miscellaneous/Extracted Programs/Data structures" ]
authors: [ "Jean-Christophe Filliâtre <>" "Pierre Letouzey <>" ]
bug-reports: "https://github.com/coq-contribs/fsets/issues"
dev-repo: "git+https://github.com/coq-contribs/fsets.git"
synopsis: "Finite Sets overs Ordered Types"
description: """
This contribution contains several implementations of finite sets over
arbitrary ordered types using functors. Currently, there are 3
implementations: sorted lists, red-black trees and AVLs."""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/fsets/archive/v8.5.0.tar.gz"
  checksum: "md5=8cc6d9670896fc5ccd500e233687e701"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-fsets.8.5.0 coq.8.10.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.10.0).
The following dependencies couldn't be met:
  - coq-fsets -> 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-fsets.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