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hott 8.9 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                 8.5.2       Formal proof management system
num                 0           The Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.03.0      The OCaml compiler (virtual package)
ocaml-base-compiler 4.03.0      Official 4.03.0 release
ocaml-config        1           OCaml Switch Configuration
# opam file:
opam-version: "2.0"
maintainer: "Jason Gross <jgross@mit.edu>"
homepage: "http://homotopytypetheory.org/"
bug-reports: "https://github.com/HoTT/Coq-HoTT/issues"
license: "BSD-2-Clause"
build: [
  ["bash" "-c" "./autogen.sh -skip-submodules || :"]
  ["./configure" "COQBIN=%{bin}%" "--prefix=%{prefix}%"]
  [make "-j%{jobs}%"]
]
install: [make "install"]
depends: [
  "conf-autoconf" {build}
  "ocaml"
  "ocamlfind" {build}
  "coq" {>= "8.9" & < "8.10~"}
]
authors: ["The Coq-HoTT Development Team"]
dev-repo: "git+https://github.com/HoTT/Coq-HoTT.git"
synopsis: "The Homotopy Type Theory library"
tags: ["logpath:HoTT"]
url {
  src: "https://github.com/HoTT/Coq-HoTT/archive/V8.9.tar.gz"
  checksum: "sha512=3ddb4adf11897d2a47a62144cba2f1bbbfb8ffd8613ffff66b92b3968a02c2f4cf59524ebcb83c0dc7d4aee9bc9a2f7ea283fecd3cd5ea0b3b2a15bb17607a29"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-hott.8.9 coq.8.5.2

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.5.2).
The following dependencies couldn't be met:
  - coq-hott -> coq >= 8.9 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-hott -> coq >= 8.9 -> 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-hott.8.9
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