OCaml 5.1.0 Release Readiness

[Octachron]

This issue tracks the build and readiness information of core platform tools and libraries in preparation for the OCaml 5.1 release. It’s intended as a meta-issue / holding place for TODO lists and links to other milestones/issues rather than general discussion (which is welcomed on Discuss or on linked issues).

Packages that are fixed upstream, have a PR ready, or can be used as-is for testing purpose, are in kit-ty-kate/opam-alpha-repository. A test run is done using this repository every 48 hours and the latest run can be seen in opam-health-check and compared against OCaml 5.1.

Platform tools:

• opam
• dune
• merlin ([new release] merlin, merlin-lib and dot-merlin-reader (4.9-501preview) #23848)
• lsp-server / vscode-plugin
• odoc (draft Basic support for OCaml 5.1 odoc#956)
• ocamlformat
• ocp-indent

Ecosystem:

• ocamlfind
• ocamlbuild
• ppxlib
• mdx
• utop (done in [new release] utop (2.12.0) #23681)
• dune-release
• opam-publish

Infrastructure:

• ocaml.org (OCaml 5.1.0 announce and release page ocaml.org#1470)
• docker base containers
• ocaml-ci
• opam-repo-ci

[anmonteiro]

Reason is ready to go: reasonml/reason#2714

[avsm]

updated with the merlin preview release https://github.com/ocaml/opam-repository/pull/23848/files

[kit-ty-kate]

OCaml 5.1.0 was released.