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alan.schmitt.1995@polytechnique.org Subject: [Caml-list] Attn: Development Editor, Latest OCaml Weekly News Reply-To: Alan Schmitt X-Loop: caml-list@inria.fr X-Sequence: 19474 Errors-To: caml-list-owner@inria.fr Precedence: list Precedence: bulk Sender: caml-list-request@inria.fr X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: Archived-At: --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: base64 SGVsbG8NCg0KSGVyZSBpcyB0aGUgbGF0ZXN0IE9DYW1sIFdlZWtseSBOZXdzLCBmb3IgdGhlIHdl ZWsgb2YgTWFyY2ggMTcgdG8gMjQsDQoyMDI2Lg0KDQpUYWJsZSBvZiBDb250ZW50cw0K4pSA4pSA 4pSA4pSA4pSA4pSA4pSA4pSA4pSA4pSA4pSA4pSA4pSA4pSA4pSA4pSA4pSADQoNCkludHJvZHVj aW5nIGF0ZG1sIChleHBlcmltZW50YWwpDQpFeHBlcmltZW50YWwgbW9kdWxlIGltcG9ydHMgaW4g QVREIChBVEQgNC4wLjApDQpEdW5lIDMuMjINClBhcnNlZmY6IHBhcnNlciBjb21iaW5hdG9yIGxp YnJhcnkgZm9yIE9DYW1sIDUNCk91dHJlYWNoeSBEZW1vIERheSBmb3IgRGVjZW1iZXIgMjAyNSBS 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charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable OCaml Weekly News

OCaml Weekly News

Previous Week<= /a> Up Next Week

Hello

Here is the latest OCaml Weekly News, for the week of March 17 to 24, 2026.

Introducing atdml (experimental)

Archive: https://discuss.ocaml.org/t/ann-introducing-atdml-experime= ntal/17908/1

Martin Jambon announced

ATD 4.0.0 was released today on opam.

This release introduces atdml, an experimental replacement for atdge= n.

The goal is to modernize the implementation and make it easier to extend, while keeping compatibility with existing ATD workflows.

Here's a sample input file example.atd: 

type location =3D {
  row: int;
  column: int;
  ?file: string option;
}

Atdml is invoked as follows, normally by the build system: 

$ atdml example.atd

It produces a pair of mli and ml files. This is example.mli: 

(* A=
uto-generated from "example.atd" by atdml. *)

type location =3D {
  row: int;
  column: int;
  file: string option;
}

val create_location : row:int -> column:int -> ?file:string -> unit -> location
val location_of_yojson : Yojson.Safe.t -> location
val yojson_of_location : location -> Yojson.Safe.t
val location_of_json : string -> location
val json_of_location : location -> string

module Location : sig
  type nonrec t =3D location
  val create : row:int -> column:int -> ?file:string -> unit -> t
  val of_yojson : Yojson.Safe.t -> t
  val to_yojson : t -> Yojson.Safe.t
  val of_json : string -> t
  val to_json : t -> string
end

Release notes: https://github= .com/ahrefs/atd/releases/tag/4.0.0

Documentation: https://atd.readthedocs.io/

Project page: https://github.com/ahrefs/atd

Experimental module imports in ATD (ATD 4.0.0)

Archive: https://discuss.ocaml.org/t/ann-experimental= -module-imports-in-atd-atd-4-0-0/17909/1

Martin Jambon announced

ATD 4.0.0 adds experimental support for imports between ATD files.

This allows splitting schemas across multiple files in a natural way.

Currently supported in:

  • atdml (OCaml)
  • atdpy (Python)
  • atdts (TypeScript)

Example: 

from utils as u import email

type email_addresses =3D u.email list

Details: https://github= .com/ahrefs/atd/releases/tag/4.0.0

For an earlier discussion of the design, see = https://discuss.ocaml.org/t/rfc-multifile-atd-definition-support-via-import= -statements/17881].

Dune 3.22

Archive: http= s://discuss.ocaml.org/t/ann-dune-3-22/17912/1

Shon announced

The Dune team is pleased to announce the release of dune 3.22.0.

In addition to many fixes and small improvements, notable highlights of thi= s release include:

See the full = changelog for all new features and fixes, and for attribution to the contributors who= made it all possible. Thank you, contributors!

If you encounter a problem with this release, please report it in our issue tracker.

Parseff: parser combinator library for OCaml 5

Archive: https://discuss.ocaml.org/t/ann-parseff-par= ser-combinator-library-for-ocaml-5/17914/1

David Sancho announced

Hi everyone,

I=E2=80=99m sharing Parseff, a parser combinator library for OCam= l 5.

If you like parser combinators but don=E2=80=99t love writing everything in= monadic style, Parseff is built for that. Parsers are plain functions (unit -> 'a) and you compose them in direct style, while Parsef= f handles backtracking and streaming under the hood (using effects!)

Why Parseff

  • Direct-style API: write sequential OCaml code, no >>= =3D, let*, or applicative operator chains required.
  • Typed errors: raise domain errors with polymorphic variants via = Parseff.error.
  • Streaming input: same parser works with Parseff.parse (string) and Parseff.parse_source (stream).
  • Zero-copy + fused ops: span APIs and fused operations for hot pa= rsing paths.
  • Domain-safe execution: parse calls are self-contained (no global= mutable state).
  • Automatic backtracking with Parseff.or_
  • Minimal dependency footprint: only re for regex

Performance

In the included benchmarks, Parseff is faster than Angstrom and MParser:

  • around ~2x in fair comparisons
  • up to ~4x+ with zero-copy optimized paths

Benchmark details and code are in the repo docs.

## Documentation

I=E2=80=99ve put a lot of effort into the docs (quick start, guides, and AP= I pages) to keep Parseff easy to learn. A bit proud of using odoc=E2=80=99s= Markdown backend plus mdx, I can generate and check examples on the fly, s= o snippets stay type-safe.

https://davesnx.github.io/par= seff

Install

opam install parseff -y

Links

If you try it, I=E2=80=99d really value feedback on: API ergonomics, error = handling experience or missing combinators or docs gaps!

Thanks!

Outreachy Demo Day for December 2025 Round

Archive: https://discuss.ocaml.org/t/outreachy-demo-day-for= -december-2025-round/17883/5

Continuing this thread, Patrick Ferris announced

The recording of our (nearly two hour!) meeting is now online: https://watch.ocaml.org/w/= 8aUqMhFvhQGq4WJLH3ukjA !

Thank you to everyone who joined :two_hump_camel:

Old CWN

If you happen to miss a CWN, you can send me a message and I'll mail it to you, or go take a loo= k at the archive or the <= a href=3D"https://alan.petitepomme.net/cwn/cwn.rss">RSS feed of the archive= s.

If you also wish to receive it every week by mail, you may subscribe to the= caml-list.

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