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hammer 1.1+8.9 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                 8.7.0       Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.06.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.06.1      Official 4.06.1 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.6       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "palmskog@gmail.com"
homepage: "https://github.com/lukaszcz/coqhammer"
dev-repo: "git+https://github.com/lukaszcz/coqhammer.git"
bug-reports: "https://github.com/lukaszcz/coqhammer/issues"
license: "LGPL-2.1-only"
build: [
  [make "-j%{jobs}%" {ocaml:version >= "4.06"}]
  [make "tests"] {with-test}
]
install: [ make "install" ]
depends: [
  "ocaml"
  "conf-g++" {build}
  "coq" {>= "8.9" & < "8.10~"}
]
tags: [
  "category:Miscellaneous/Coq Extensions"
  "keyword:automation"
  "keyword:hammer"
  "date:2019-02-11"
  "logpath:Hammer"
]
authors: [
  "Lukasz Czajka <lukaszcz@mimuw.edu.pl>"
  "Cezary Kaliszyk <cezary.kaliszyk@uibk.ac.at>"
  "Burak Ekici <burak.ekici@uibk.ac.at>"
]
synopsis: "Automation for Dependent Type Theory"
url {
  src: "https://github.com/lukaszcz/coqhammer/archive/refs/tags/v1.1-coq8.9.tar.gz"
  checksum: "md5=76a72dd942b2f6d4f6392b0a9f44af02"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-hammer.1.1+8.9 coq.8.7.0

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.7.0).
The following dependencies couldn't be met:
  - coq-hammer -> coq >= 8.9 -> ocaml >= 4.09.0
      base of this switch (use `--unlock-base' to force)
  - coq-hammer -> 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-hammer.1.1+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