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math-classes 8.8.1 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                 8.5.0       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: "b.a.w.spitters@gmail.com"
homepage: "https://math-classes.github.io/"
dev-repo: "git+https://github.com/coq-community/math-classes/"
bug-reports: "https://github.com/coq-community/math-classes/issues"
doc: "https://math-classes.github.io/"
authors: [
  "Eelis van der Weegen"
  "Bas Spitters"
  "Robbert Krebbers"
]
license: "Public Domain"
build: [
  [ "./configure.sh" ]
  [ make "-j%{jobs}%" ]
]
install: [
  [ make "install" ]
]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/MathClasses"]
depends: [
  "ocaml"
  "coq" {>= "8.6" & < "8.10~"}
  "coq-bignums"
]
synopsis: "A library of abstract interfaces for mathematical structures in Coq"
flags: light-uninstall
url {
  src: "https://github.com/coq-community/math-classes/archive/8.8.1.zip"
  checksum: "md5=a82e0e3e13b04cbb4d383c11ef5796f3"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-math-classes.8.8.1 coq.8.5.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.5.0).
The following dependencies couldn't be met:
  - coq-math-classes -> coq >= 8.6 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-math-classes -> coq >= 8.6 -> 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-math-classes.8.8.1
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