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From: Alan Schmitt <>
To: "lwn" <>, "cwn"  <>,,
Subject: [Caml-list] Attn: Development Editor, Latest OCaml Weekly News
Date: Tue, 22 Dec 2020 09:48:56 +0100
Message-ID: <> (raw)

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Here is the latest OCaml Weekly News, for the week of December 15 to 22,

Table of Contents

ocaml-lsp-server 1.4.0
OCaml 4.12.0, third alpha release
Lwt 5.4.0, Lwt_ppx 2.0.2, Lwt_react 1.1.4 releases
Senior software engineer at Docent, France - Remote OK

ocaml-lsp-server 1.4.0


Rudi Grinberg announced

  On behalf of the ocaml-lsp team, it is my pleasure to announce version
  1.4.0. This release introduces support for [automatic signature help].
  Signature help is not yet present in all possible contexts. We intend
  to improve to support as many relevant language constructs as possible
  in the future. Many thanks to @mnxn for implementing this feature.

  The full change log is replicated at the end of this post for your

  Happy Holidays!

  • Support cancellation notifications when possible. (#323)

  • Implement signature help request for functions (#324)

  • Server LSP requests & notifications concurrently. Requests that
    require merlin are still serialized. (#330)

[automatic signature help]

OCaml 4.12.0, third alpha release


octachron announced

  The release of OCaml 4.12.0 is approaching. We have released a third
  alpha version to help fellow hackers join us early in our bug hunting
  and opam ecosystem fixing fun.

  Beyond the usual bug fixes, this new alpha version contains two small
  API fixes for statmemprof and the Unix module. (Keen-eyed readers
  might notice a breaking change in the change log below but this
  concerns a corner case of a corner case of the type system that should
  not affect anyone.)

  The base compiler can be installed as an opam switch with the
  following commands
  │ opam update
  │ opam switch create 4.12.0~alpha3
  │ --repositories=default,beta=git+
  If you want to tweak the configuration of the compiler, you can pick
  configuration options with
  │ opam update
  │ opam switch create <switch_name> --packages=ocaml-variants.4.12.0~alpha3+options,<option_list>
  │ --repositories=default,beta=git+
  where <option_list> is a comma separated list of ocaml-option-*
  packages. For instance, for a flambda and afl enabled switch:
  │ opam switch create 4.12.0~alpha3+flambda+afl
  │ --packages=ocaml-variants.4.12.0~alpha3+options,ocaml-option-flambda,ocaml-option-afl
  │ --repositories=default,beta=git+
  All available options can be listed with "opam search ocaml-option".

  The source code for the alpha is also available at these addresses:

  • <>
  • <>

  If you want to test this version, it is advised to install the alpha
  opam repository


  │ opam repo add alpha git://
  This alpha repository contains various packages patched with fixes in
  the process of being upstreamed. Once the repository installed, these
  patched packages will take precedence over the non-patched version.

  If you find any bugs, please report them here:

Changes from the second alpha:

  • *additional fixes* [1128], [7503], [9036], [9722], +[10069]:
     EINTR-based signal handling. When a signal arrives, avoid running
     its OCaml handler in the middle of a blocking section. Instead,
     allow control to return quickly to a polling point where the signal
     handler can safely run, ensuring that

  • [9907]: Fix native toplevel on native Windows. (David Allsopp,
    review by Florian Angeletti)

  • [10056]: Memprof: ensure young_trigger is within the bounds of the
    minor heap in caml_memprof_renew_minor_sample (regression from
    [8684]) (David Allsopp, review by Guillaume Munch-Maccagnoni and
    Jacques-Henri Jourdan)

  • [10062]: set ARCH_INT64_PRINTF_FORMAT correctly for both modes of
    mingw-w64 (David Allsopp, review by Xavier Leroy)

  • [10025]: Track custom blocks (e.g. Bigarray) with Statmemprof
    (Stephen Dolan, review by Leo White, Gabriel Scherer and
    Jacques-Henri Jourdan)

  • [10070]: Fix Float.Array.blit when source and destination arrays
    coincide. (Nicolás Ojeda Bär, review by Alain Frisch and Xavier

  • *additional fixes* [9869], +[10073]: Add Unix.SO_REUSEPORT (Yishuai
     Li, review by Xavier Leroy, amended by David Allsopp)

  • [9877]: manual, warn that multi-index indexing operators should be
    defined in conjunction of single-index ones. (Florian Angeletti,
    review by Hezekiah M. Carty, Gabriel Scherer, and Marcello Seri)

  • [10046]: Link all DLLs with -static-libgcc on mingw32 to prevent
    dependency on libgcc_s_sjlj-1.dll with mingw-w64 runtime 8.0.0
    (previously this was only needed for dllunix.dll). (David Allsopp,
    report by Andreas Hauptmann, review by Xavier Leroy)

  • [9896]: Share the strings representing scopes, fixing some
    regression on .cmo/.cma sizes (Alain Frisch and Xavier Clerc, review
    by Gabriel Scherer)

  • [10044]: Always report the detected ARCH, MODEL and SYSTEM, even for
    bytecode- only builds (fixes a "configuration regression" from 4.08
    for the Windows builds) (David Allsopp, review by Xavier Leroy)

  • [10071]: Fix bug in tests/misc/ that was reported in
    [10055] (Damien Doligez and Gabriel Scherer, report by David

  • *breaking change* [8907], [9878]: `Typemod.normalize_signature' uses
     wrong environment Does not treat submodules differently when
     normalizing conjunctive types in polymorphic variants. This may
     break code that expose conjunctive types in inferred
     interface. (Jacques Garrigue, report and review by Leo White)

  • [9739], [9747]: Avoid calling type variables, types that are not
    variables in recursive occurence error messages (for instance, "Type
    variable int occurs inside int list") (Florian Angeletti, report by
    Stephen Dolan, review by Armaël Guéneau)

  • [10048]: Fix bug with generalized local opens. (Leo White, review by
    Thomas Refis)

[1128] <>

[7503] <>

[9036] <>

[9722] <>

[10069] <>

[9907] <>

[10056] <>

[8684] <>

[10062] <>

[10025] <>

[10070] <>

[9869] <>

[10073] <>

[9877] <>

[10046] <>

[9896] <>

[10044] <>

[10071] <>

[10055] <>

[8907] <>

[9878] <>

[9739] <>

[9747] <>

[10048] <>

Lwt 5.4.0, Lwt_ppx 2.0.2, Lwt_react 1.1.4 releases


Raphaël Proust announced

  We are glad to announce the release of version 5.4.0 of Lwt, version
  2.0.2 of Lwt_ppx, and version 1.1.4 of Lwt_react.


  It can be installed from opam as usual:

  │ opam update
  │ opam upgrade lwt lwt_ppx lwt_react

OCaml 4.12 compatibility

  With this release, Lwt is now compatible with OCaml 4.12. Thanks
  @kit-ty-kate for the contribution towards this support.

  Thanks as well to all the other contributors for all the other
  improvements that made it into this release. Check-out the release's
  changelog (link above) for a full list of bugfixes and additions.

Maintainers' notes

  As per [a previous announce] I am a co-maintainer of Lwt. With this
  release I'm taking on a more and more central role in the maintenance
  effort. Whilst I've received a lot of help getting this release
  together, I'm most likely the one responsible for any issues in the

  I'd like to thank @antron who is as stellar with maintenance of the
  project as he is with guiding me through the learning process. I'd
  also like to thank the opam-repository team who stepped up very
  quickly to fix some CI-related build-issues. And I'd like to thank my
  employer, [Nomadic Labs], who agreed to make Lwt maintenance part of
  my day job.

  I'm looking forward to all your bug reports, pull requests, comments,
  ideas, questions, remarks, as well as any sort of feedback. Don't
  hesitate to get in touch!

[a previous announce]

[Nomadic Labs] <>

Senior software engineer at Docent, France - Remote OK


Thibaut Mattio announced

  Docent, a company I'm working with, is recruiting an OCaml
  developer. You can see the job post [here]

  The team and project are really nice, I would definitely recommend it!

  I've built the current version of the backend, so don't hesitate to
  reach out ( if you have any questions on the
  tech (or other).



  If you happen to miss a CWN, you can [send me a message] and I'll mail
  it to you, or go take a look at [the archive] or the [RSS feed of the

  If you also wish to receive it every week by mail, you may subscribe

  [Alan Schmitt]

[send me a message] <>

[the archive] <>

[RSS feed of the archives] <>

[online] <>

[Alan Schmitt] <>

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