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paco 4.0.3 Not compatible 👼

Context

# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
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                 8.8.1       Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.06.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.06.1      Official 4.06.1 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "minki.cho@sf.snu.ac.kr"
synopsis: "Coq library implementing parameterized coinduction"
homepage: "https://github.com/snu-sf/paco/"
dev-repo: "git+https://github.com/snu-sf/paco.git"
bug-reports: "https://github.com/snu-sf/paco/issues/"
authors: [
  "Chung-Kil Hur <gil.hur@sf.snu.ac.kr>"
  "Georg Neis <neis@mpi-sws.org>"
  "Derek Dreyer <dreyer@mpi-sws.org>"
  "Viktor Vafeiadis <viktor@mpi-sws.org>"
  "Minki Cho <minki.cho@sf.snu.ac.kr>"
]
license: "BSD-3-Clause"
build: [make "-C" "src" "all" "-j%{jobs}%"]
install: [make "-C" "src" "-f" "Makefile.coq" "install"]
depends: [
  "coq" {>= "8.9" & < "8.13~"}
]
tags: [
  "date:2020-12-30"
  "category:Computer Science/Programming Languages/Formal Definitions and Theory"
  "category:Mathematics/Logic"
  "keyword:co-induction"
  "keyword:simulation"
  "keyword:parameterized greatest fixed point"
]
url {
  http: "https://github.com/snu-sf/paco/archive/v4.0.3.tar.gz"
  checksum: "11d6a056ce263f62db7023646a34dff6"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-paco.4.0.3 coq.8.8.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.8.1).
The following dependencies couldn't be met:
  - coq-paco -> coq >= 8.9 -> ocaml >= 4.09.0
      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-paco.4.0.3
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