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io-system 2.4.1 Not compatible 👼

Context

# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
base-num            base        Num library distributed with the OCaml compiler
base-ocamlbuild     base        OCamlbuild binary and libraries 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                 8.4.6       Formal proof management system.
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.02.3      The OCaml compiler (virtual package)
ocaml-base-compiler 4.02.3      Official 4.02.3 release
ocaml-config        1           OCaml Switch Configuration
ocamlbuild          0           Build system distributed with the OCaml compiler since OCaml 3.10.0
# opam file:
opam-version: "2.0"
maintainer: "dev@clarus.me"
homepage: "https://github.com/clarus/io-system"
dev-repo: "git+https://github.com/clarus/io-system.git"
bug-reports: "https://github.com/clarus/io-system/issues"
authors: ["Guillaume Claret"]
license: "MIT"
build: [
  ["./configure.sh"]
  [make "-j%{jobs}%"]
]
install: [
  [make "install"]
]
depends: [
  "ocaml"
  "coq" {>= "8.5"}
  "coq-function-ninjas"
  "coq-list-string" {>= "2.0.0"}
  "coq-io" {>= "4.0.0"}
  "coq-io-system-ocaml" {>= "2.3.0"}
]
tags: [
  "date:2019-07-28"
  "keyword:effects"
  "keyword:extraction"
  "logpath:Io.System"
]
synopsis: "System effects for Coq"
url {
  src: "https://github.com/coq-io/system/archive/2.4.1.tar.gz"
  checksum: "sha512=b9ff95a7073bec5116d299b4c34013d40c3eb03eea79a11667777e2325f868eb850de30222ab1bd06448fb016a9093a31e4a41ab273ede09e85a05d9ab31dc34"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-io-system.2.4.1 coq.8.4.6

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.4.6).
The following dependencies couldn't be met:
  - coq-io-system -> coq >= 8.5 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-io-system -> coq >= 8.5 -> coq-core -> 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-io-system.2.4.1
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