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finger-tree 8.9.0 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                 8.8.0       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
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "Hugo.Herbelin@inria.fr"
homepage: "http://mattam.org/research/russell/fingertrees.en.html"
license: "LGPL"
build: [make "-j%{jobs}%"]
install: [make "install"]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/FingerTree"]
depends: [
  "ocaml"
  "coq" {>= "8.9" & < "8.10~"}
]
tags: [
  "keyword: data structures"
  "keyword: dependent types"
  "keyword: Finger Trees"
  "category: Computer Science/Data Types and Data Structures"
  "date: 2009-02"
]
authors: [
  "Matthieu Sozeau <mattam@mattam.org> [http://mattam.org]"
]
bug-reports: "https://github.com/coq-contribs/finger-tree/issues"
dev-repo: "git+https://github.com/coq-contribs/finger-tree.git"
synopsis: "Dependent Finger Trees"
description: """
A verified generic implementation of Finger Trees"""
flags: light-uninstall
url {
  src: "https://github.com/coq-contribs/finger-tree/archive/v8.9.0.tar.gz"
  checksum: "md5=adc47781ae46112ccdbbfc53676093fb"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-finger-tree.8.9.0 coq.8.8.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.8.0).
The following dependencies couldn't be met:
  - coq-finger-tree -> coq >= 8.9 -> ocaml >= 4.05.0
      base of this switch (use `--unlock-base' to force)
  - coq-finger-tree -> 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-finger-tree.8.9.0
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