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io-hello-world 1.0.0 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                 8.7.1+1     Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.07.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.07.1      Official release 4.07.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "dev@clarus.me"
homepage: "https://github.com/clarus/coq-hello-world"
dev-repo: "git+https://github.com/clarus/coq-hello-world.git"
bug-reports: "https://github.com/clarus/coq-hello-world/issues"
authors: ["Guillaume Claret"]
license: "MIT"
build: [
  ["./configure.sh"]
  [make "-j%{jobs}%"]
  [make "-C" "extraction"]
]
depends: [
  "ocaml"
  "coq" {>= "8.4pl4" & < "8.9"}
  "coq-io-system" {>= "2.2.0" & < "2.3.0"}
]
tags: [
  "date:2015-03-23"
  "keyword:effects"
  "keyword:extraction"
]
synopsis: "A Hello World program in Coq"
extra-files: [
  "coq-io-hello-world.install" "md5=63d2dca2628eb17acf4b57b72d248663"
]
url {
  src: "https://github.com/coq-io/hello-world/archive/1.0.0.tar.gz"
  checksum: "md5=8a332eb873e144efcf0bb99ece8e1fd6"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-io-hello-world.1.0.0 coq.8.7.1+1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.7.1+1).
The following dependencies couldn't be met:
  - coq-io-hello-world -> coq-io-system = 2.2.0 -> coq-io-system-ocaml < 2.3.0 -> ocaml < 4.06.0
      base of this switch (use `--unlock-base' to force)
  - coq-io-hello-world -> coq-io-system = 2.2.0 -> coq < 8.5~ -> ocaml < 4.03.0
      base of this switch (use `--unlock-base' to force)
Your request can't be satisfied:
  - No available version of coq-io-system 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-io-hello-world.1.0.0
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