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(CEST) From: Alan Schmitt To: "lwn" , "cwn" , caml-list@inria.fr Date: Tue, 17 Aug 2021 08:24:33 +0200 Message-ID: <8735r8io66.fsf@m4x.org> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="=-=-=" X-AV-Checked: ClamAV using ClamSMTP at svoboda.polytechnique.org (Tue Aug 17 08:24:38 2021 +0200 (CEST)) X-Spam-Flag: No, tests=bogofilter, spamicity=0.000068, queueID=2900C564780 X-Org-Mail: 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: 18552 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 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OCaml Weekly News

Previous Week<= /a> Up Next Week

Hello

Here is the latest OCaml Weekly News, for the week of August 10 to 17, 2021.

http-multipart-formdata v3.0.1 released

Archive: https://discuss.ocaml.org/t/ann-http-multipart-for= mdata-v3-0-1-released/8261/2

Continuing the thread from last week, Hannes Mehnert = asked

Thanks for your work on that. I'm curious about the different "multipart" l= ibraries now available for OCaml – anyone has a brief comparison of them?

Are there functional differences? Correctness? Performance? Or just a matte= r of style and co-development?

Bikal Lem replied

One obvious difference among the three is http-multipart-formdata doesn't depend on any IO/Promise libraries, such as lwt or async. so you may find it easier to in= tegrate in your project.

mulitpart-form-data exposes a callback based streaming api, wh= ereas http-multipart-formdata exposes a non-callback, non-blocking based API streaming api.

The API surface of http-multipart-formdata is kept as low as p= ossible, primarily 3 API calls - boundary, reader and read call.

The dependency list of http-multipart-formdata is the thinnest= . This may or may not be an issue depending on your aesthetics. However, relatively/comparatively the l= ess your dependencies, the easier it is to integrate the lib with other OCaml libs a= nd environments such as various OSes.

Bikal Lem added

I should also add http-multipart-formdata has been implemented= with zero-copy streaming and minimal allocation in mind.

Call for participation: ML Family Workshop 2021

Archive: https://sympa.inria.fr/sympa/arc/caml-list/2021-08/msg00005.html=

Jonathan Protzenko announced

We are happy to announce that the ML Family Workshop is back for its 2021 edition, which we will be held online on Thursday August 26th, in conjunction with ICFP 2021. We invite you to subscribe to, and attend the workshop, in addition to the main ICFP conference.

We are thrilled to announce that Don Syme will give this year's keynote: "Narratives and Lessons from The Early History of F#". Please join us!

The program features 14 exciting submissions, including 4 short talks. The workshop will be held online in the 6pm-3am time band (Seoul Time). Talks will be pre-recorded and uploaded online for those who cannot attend.

Program committee

  • Danel Ahman (University of Ljubljana)
  • Robert Atkey (University of Strathclyde)
  • Fr=C3=A9d=C3=A9ric Bour (Tarides)
  • Ezgi =C3=87i=C3=A7ek (Facebook London)
  • Youyou Cong (Tokyo Institute of Technology)
  • Richard A. Eisenberg (Tweag I/O)
  • Martin Elsman (University of Copenhagen, Denmark)
  • Ohad Kammar (University of Edinburgh)
  • Naoki Kobayashi (University of Tokyo, Japan)
  • Beno=C3=AEt Montagu (Inria)
  • Jonathan Protzenko (Microsoft Research) (Chair)
  • Kristina Sojakova (INRIA Paris)
  • Don Syme (Microsoft)
  • Mat=C3=ADas Toro (University of Chile)
  • Katsuhiro Ueno (Tohoku University)

Coq-of-ocaml to translate OCaml to Coq

Archive: https://discuss.ocaml.org/t/coq-of-ocaml-to-translate-o= caml-to-coq/8288/1

Guillaume Claret announced

I am pleased to present the coq-of-ocaml project, to translate a subset of OCaml to the Coq= proof assistant. The aim is to do formal verification on OCaml programs. The idea is to generate a C= oq translation as close as possible to the original code in terms of intent but using the Coq= syntax. As a short example, if we take the following OCaml code and run coq-of-oca= ml: 

type 'a tree =3D
| Leaf of 'a
| Node of 'a tree * 'a tree

let rec sum tree =3D
  match tree with
  | Leaf =
n -> n
  | Node =
(tree1, tree2) -> sum tree1 + sum tree2

we get the following Coq file: 

Require Import CoqOfOCaml.CoqOfOCaml.
Require Import CoqOfOCaml.Settings.

Inductive tree (a : Set) : Set :=3D
| Leaf : a -> tree a
| Node : tree a -> tree a -> tree a.

Arguments Leaf {_}.
Arguments Node {_}.

Fixpoint sum (tree : tree int) : int :=3D
  match tree with
  | Leaf n =3D> n
  | Node tree1 tree2 =3D> Z.add (sum tree1) (sum tree2)
  end.

We support the following OCaml features:

  • the core of OCaml (functions, let bindings, pattern-matching,…)<= /li>
  • type definitions (records, inductive types, synonyms, mutual types)
  • monadic programs
  • modules as namespaces
  • modules as polymorphic records (signatures, functors, first-class modul= es)
  • multiple-file projects (thanks to Merlin)
  • both .ml and .mli files
  • existential types (we use impredicative sets option in Coq)

We also have some support for the GADTs, the polymorphic variants, and the = extensible types. We are in particular working on having an axiom-free translation of the GAD= Ts to Coq. We do not support:

  • side-effects outside of a monad (references, exceptions, …);
  • object-oriented programming;
  • various combinations of OCaml features for which coq-of-ocaml should generate a warning.

Our main example and use case is the coq-tezos-of= -ocaml project. This contains a translation of most of the economic protocol of the Tezos blockchain (around 30.000 lines of= OCaml translated to 40.000 lines of Coq). For example, we verify the comparison functions defined in src/proto_alpha/lib_protocol/script_compara= ble.ml with src/Proto_alpha/Proofs/Script_comparable.v.

We are looking for the application to other projects too.

We think the best way to use coq-of-ocaml is to continue devel= oping in OCaml and run coq-of-ocaml to keep a synchronized translation in Coq. Having= a working Coq translation (as compiling in Coq) forces us to avoid some OCaml constructs. We believe = these constructs would probably be hard to verify anyway. Then, on the Coq side, we can veri= fy some important or easy to catch properties. If there is a regression in the OCaml code, re= -running coq-of-ocaml should make the proofs break.

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.

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