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alea 8.12.0 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: "anton.a.trunov@gmail.com"
homepage: "https://github.com/coq-community/alea"
dev-repo: "git+https://github.com/coq-community/alea.git"
bug-reports: "https://github.com/coq-community/alea/issues"
license: "LGPL-2.1-only"
synopsis: "Coq library for reasoning on randomized algorithms"
description: """
ALEA is a library for reasoning on randomized algorithms
in Coq, based on interpreting programs inside a monad
as probability distributions."""
build: [make "-j%{jobs}%"]
install: [make "install"]
depends: [
  "coq" {(>= "8.12" & < "8.15~") | (= "dev")}
]
tags: [
  "category:Computer Science/Data Types and Data Structures"
  "keyword:randomized algorithm"
  "keyword:probability"
  "keyword:monads"
  "logpath:ALEA"
]
authors: [
  "Christine Paulin-Mohring"
  "David Baelde"
  "Pierre Courtieu"
]
url {
  src: "https://github.com/coq-community/alea/archive/v8.12.0.tar.gz"
  checksum: "sha512=eca50e7804b3ab29294d6a41e34d3207298c5f72086b82b4ce3387fc479505e930ac83159d214f378adb1f6d351e72849c14341581db4490bbc2a20a249959ab"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-alea.8.12.0 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-alea -> coq >= dev -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-alea -> coq >= dev -> 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-alea.8.12.0
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