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tree-diameter 8.5.0 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: "matej.kosik@inria.fr"
homepage: "https://github.com/coq-contribs/tree-diameter"
license: "LGPL 2"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/TreeDiameter"]
depends: [
  "ocaml"
  "coq" {>= "8.5" & < "8.6~"}
]
tags: [ "keyword:program verification" "keyword:trees" "keyword:paths" "keyword:graphs" "keyword:distance" "keyword:diameter" "category:Computer Science/Decision Procedures and Certified Algorithms/Correctness proofs of algorithms" ]
authors: [ "Jean-Christophe Filliâtre <>" ]
bug-reports: "https://github.com/coq-contribs/tree-diameter/issues"
dev-repo: "git+https://github.com/coq-contribs/tree-diameter.git"
synopsis: "Diameter of a binary tree"
description: """
This contribution contains the verification of a divide-and-conquer
algorithm to compute the diameter of a binary tree (the
maxmimal distance between two nodes in the tree)."""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/tree-diameter/archive/v8.5.0.tar.gz"
  checksum: "md5=2efced5402f7dd09bba68d87ac57e38f"
}

Lint

Command
true
Return code
0

Dry install 🏜️

Dry install with the current Coq version:

Command
opam install -y --show-action coq-tree-diameter.8.5.0 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-tree-diameter -> coq < 8.6~ -> ocaml < 4.03.0
      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-tree-diameter.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