[cwn] Attn: Development Editor, Latest OCaml Weekly News
Alan Schmitt
alan.schmitt at polytechnique.org
Tue Jun 23 05:50:30 PDT 2020
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Hello
Here is the latest OCaml Weekly News, for the week of June 16 to 23,
2020.
Table of Contents
?????????????????
Alt-Ergo-free 2.2.0 release
Ocaml-migrate-parsetree 2.0.0
Free culture OCaml book progress
OCaml 4.11.0, third alpha release with RISC-V backend
Roll your own bubblewrap sandboxing scripts in OCaml
Second release of Sek
Tools or pointers for control flow analysis of OCaml code?
A new build system API in Dune: please send thoughts, ideas and wishes
Other OCaml News
Old CWN
Alt-Ergo-free 2.2.0 release
???????????????????????????
Archive:
[https://discuss.ocaml.org/t/ann-alt-ergo-free-2-2-0-release/5988/1]
Albin Coquereau announced
?????????????????????????
As discussed with our users and both our academic and industrial
partners in the [Alt-Ergo Users' Club], we are pleased to announce the
new free release of Alt-Ergo. Alt-Ergo 2.2.0 is now under the Apache
license. The `alt-ergo-free' package has been updated in the opam
repository to this version as well.
You can find the source archive, changes and more on the [Alt-Ergo
website]. The main changes are the new SAT solver (from Alt-Ergo
2.1.0) and the experimental support for the SMT-lib standard
(introduced in Alt-Ergo 2.2.0)
[Alt-Ergo Users' Club] https://alt-ergo.ocamlpro.com/#club
[Alt-Ergo website] https://alt-ergo.ocamlpro.com/#releases
Ocaml-migrate-parsetree 2.0.0
?????????????????????????????
Archive:
[https://discuss.ocaml.org/t/ocaml-migrate-parsetree-2-0-0/5991/1]
J?r?mie Dimino announced
????????????????????????
We are preparing a 2.0.0 release of [ocaml-migrate-parsetree]. This
new major release will simplify the project to its core purpose, which
is to provide migration functions between the various versions of the
parsetree types. Everything else, such as the driver or the
per-version copy of various modules from the compiler distribution
will go away. This will have an impact for projects that are currently
using these functionalities and this post describes what we think such
projects should do and how we plan to help.
The motivation for this change is to simplify ocaml-migrate-parsetree
and make it easier to maintain. The core functionality it provides is
valuable and worth maintaining, however right now the project is way
too big and difficult to maintain. Going through compiler upgrades has
been unpleasant and difficult. And because of this, bugs of the
segfault kind have accidentally been introduced and detected much
later.
Once we have dropped everything that doesn't fit in the purpose of the
project, what will remain will be pretty simple, coherent and easy to
maintain.
[ocaml-migrate-parsetree]
https://github.com/ocaml-ppx/ocaml-migrate-parsetree/
What is the replacement?
????????????????????????
At the moment, ocaml-migrate-parsetree offers one way of writing ppx
rewriters. For instance, one might write the following to create a ppx
rewriter with ocaml-migrate-parsetree:
?????
? open Migrate_parsetree
? open Ast_404
?
? let structure = ...
? let signature = ...
?
? let () =
? Driver.register ~name:"ppx_cstruct" Versions.ocaml_404
? (fun _config _cookies -> {default_mapper with structure; signature})
?????
Following the simplification, the above code will break for at least
two reasons:
? the `Migrate_parsetree.Driver' will be gone
? the `default_mapper' and `mapper' type coming from
`Ast_404.Ast_mapper' will be gone
As a result, ocaml-migrate-parsetree itself will no longer be enough
to write ppx rewriters.
We recommend that ppx rewriters using the ocaml-migrate-parsetree API
switch to [ppxlib]. The purpose of ppxlib is to provide a good API
for ppx rewriters with in particular a simple and good composition
model, so it seems like a natural choice. Since ppxlib will take a
more central place in the ecosystem, we are currently addressing the
more controversial aspects of this library. For instance, we are
dropping the dependency on Base.
[ppxlib] https://github.com/ocaml-ppx/ppxlib/
Organising the transition
?????????????????????????
The following ticket is the meta issue tracking the preparation of the
2.0.0 release:
[https://github.com/ocaml-ppx/ocaml-migrate-parsetree/issues/101]
To make this transition smoother, we are planning to help with the
porting effort. We have prepared [a list of ppx rewriters to port to
ppxlib]. This list is not exhaustive and in particular excludes ppx
rewriters that have no reverse dependencies in opam in order to keep
this work manageable for us. In any case, help porting projects to
ppxlib would be very much appreciated.
If you would like to help porting a project, please mention on the
corresponding ticket from the list that you are looking at porting
this project so that we know someone is working on it. If you would
like to port a project that is not on this list, you should feel free
to open a new ticket and mention that you are porting this project. In
this case, please make sure to add the label `port-to-ppxlib' to the
issue.
Once we have successfully converted a few projects, we will proceed
with the release of ocaml-migrate-parsetree 2.0.0 and a compatible
ppxlib release. At this point, most existing reverse dependencies of
ocaml-migrate-parsetree will be marked as incompatible with
ocaml-migrate-parsetree 2.0.0 and we will continue porting existing
projects to ppxlib to gradually make the world compatible with
ocaml-migrate-parsetree 2.0.0.
[a list of ppx rewriters to port to ppxlib]
https://github.com/ocaml-ppx/ppxlib/issues?q=is%3Aopen+is%3Aissue+label%3Aport-to-ppxlib
Consequences for other ppx libraries
????????????????????????????????????
? ppx_deriving
The master of [ppx_deriving] is now using ppxlib, so there shouldn't
be much to do to make ppx_deriving compatible with
ocaml-migrate-parsetree 2.0.0.
[ppx_deriving] https://github.com/ocaml-ppx/ppx_deriving
? ppx_tools_versioned
[ppx_tools_versioned] will no longer have a reason to exist in this
new state of the world and so will stop being updated.
[ppx_tools_versioned] https://github.com/ocaml-ppx/ppx_tools_versioned
Nicol?s Ojeda B?r asked and J?r?mie Dimino replied
??????????????????????????????????????????????????
what is the story with dune? Right now, dune ?just works?
with ppx rewriters based on OMP, what will happen after
the announced evolutions?
OMP won't provide a driver anymore. To write a ppx rewriter that is
compatible with Dune, you will have to use ppxlib. You could also
write your own driver, thought I wouldn't recommend doing that; we are
trying to reduce the number of APIs rather that increase it :)
Will the planned updates to ppxlib (getting rid of base,
etc.) be done in time for the release of OMP 2.0.0?
Yes. @ceastlund started working on dropping the Base dependency and
since it will be the same group of people doing the ppxlib and omp
changes, we will make sure that there is a new version of ppxlib
available on time. We plan to do things in this order:
? prepare OMP2 and an updated ppxlib
? add upper bounds to all OMP reverse dependencies in the opam
repository
? release OMP2
? release an updated ppxlib shortly after OMP2 is merged in the opam
repository
Would it be possible to make a minimal version of
ppxlib/OMP for those that are willing to write a ppx
rewriter against compiler-libs directly and do not
need/want the rest of the library, but still want their
rewriters to be compatible with dune?
Technically yes. That said, I wouldn't recommend going down this
route. Once most of the dependencies of ppxlib have been dropped and
OMP has been simplified, the resulting OMP+ppxlib combo will be pretty
lean. If there are aspects of ppxlib that would prevent people from
switching to it, we are happy to consider those.
Once we have finished our work on simplifying the ppx ecosystem, I
also expect that the bare ppx API in the compiler will disappear, so I
would definitely not recommend to use it.
Could you say a few words on how the evolution of ppxlib
is related to ppx 1?
Sure. The ppx project is part of [this work]. Our plan was to move to
a world like this:
? the compiler offers a minimal stable Astlib library, using a dynamic
AST
? the ppx project is written only against Astlib and not the rest of
compiler-libs
? ppx has a stable API
? ppx rewriters are written against the ppx API
In this world, existing ppx rewriters are compatible with trunk at all
times. Moreover, when a new compiler is released:
? existing released ppx rewriters are immediately compatible with the
new compiler
? one can use existing ppx rewriters and the new features of the
language
in other words, you can in theory release a ppx rewriters once and
never touch it again. The trade-off is that it uses a technology that
is quite complex and users don't have direct access to the parsetree
types.
However, we don't expect everyone to switch to this API at once. So we
will need a transition period where the existing APIs are implemented
as shims on top of the new ppx API. The more ppx APIs we have to
consider and the more difficult this work will be for us. So one can
see this work of simplifying OMP and ppxlib as preparatory work.
Now, all of the above was our original plan. We are now considering an
alternative plan that would lead to a technically simpler system that
is easier to reason about. The new plan would lead to the following
world:
? the compiler offers a minimal stable Astlib library, using the OMP
technology
? ppxlib is written only against Astlib and not the rest of
compiler-libs
? ppx rewriters are written against ppxlib
In this world, existing ppx rewriters are compatible with trunk at all
times. Moreover, when a new compiler is released:
? existing released ppx rewriters are immediately compatible with the
new compiler
? one cannot use existing ppx rewriters and the new features of the
language until:
? ppxlib has been updated to use the new parsetree types
? the subset of ppx rewriters that are broken by this change have
been updated as well
This new plan requires updating potentially many packages after each
new compiler release. We know that from a technical point of view this
is relatively easy. In fact, we do that all the time at Jane Street:
when we bump the version of the AST, one single person sit downs and
updates all the ppx rewriters at once, which doesn't take very
long. In the open-source world, this was historically impossible,
though now that most OCaml projects are using dune this is becoming
more realistic; we can create one big dune workspace with all the ppx
rewriters and update them all at once. That said, there is a social
component to this approach since the various packages are owned by
various groups of people and even if one person does all the work, we
still need various groups of people to take action to merge PRs and
make new releases. So we plan to try this idea with one or two
compiler release. In fact, @NathanReb is experimenting with this idea
as we speak for the 4.10 upgrade of ppxlib. If this all works out
well, we'll continue with this new plan. Otherwise, we'll go back to
the original plan.
[this work] https://discuss.ocaml.org/t/the-future-of-ppx/3766
Anton Kochkov added
???????????????????
There is also [ppx_deriving_protobuf #28] for porting to ppxlib.
[ppx_deriving_protobuf #28]
https://github.com/ocaml-ppx/ppx_deriving_protobuf/issues/28
Free culture OCaml book progress
????????????????????????????????
Archive:
[https://discuss.ocaml.org/t/free-culture-ocaml-book-progress/5994/1]
Daniil Baturin announced
????????????????????????
You may (or may not) remember that I've been working on a free culture
OCaml book, under "Unreal world OCaml" working title.
Zeroth, it's now named "OCaml from the ground up". I hope that title
tells what I want the book to be. "Unreal world OCaml" clearly wasn't
a title it could use forever. I briefly considered naming it
"Elements of OCaml", but the Bourbaki reference is a bit too obscure
and it sounds strange (not that their "Elements of Mathematic" doesn't
sound strange to begin with?).
First, it has a proper home now at [https://ocamlbook.org/] The old
[https://ocaml-book.baturin.org] URL redirects to it now. It's hosted
on Netlify for better availability. From my quick research, Netlify
doesn't do anything obviously evil, but if I missed something, let me
know.
Second, there's now CI setup, so the live version is going to be in
sync with the source. Examples in "(triple backtick)ocaml" blocks are
automatically typechecked (with `ocamlc -stop-after typing'). These
fail the build if they fail to typecheck. Intentionally invalid
examples should be in "(triple backtick)invalid-ocaml" blocks
instead?those are run through syntax highlighting but excluded from
type checking.
Content-wise, I've made some improvements to the Records and
References chapter. I'll keep posting progress here in the thread if
no one objects.
OCaml 4.11.0, third alpha release with RISC-V backend
?????????????????????????????????????????????????????
Archive:
[https://discuss.ocaml.org/t/ocaml-4-11-0-third-alpha-release-with-risc-v-backend/5997/1]
octachron announced
???????????????????
A new alpha version of OCaml 4.11.0 has been published.
Exceptionally, this third alpha release integrates a new exciting
feature: a native-code backend for RISC-V. Since this new backend
cannot affect negatively other architecture, the feature has been
backported to the 4.11 branch.
Beyond this important change, the full change list compared to the
second alpha is rather small:
? *new feature* [9440]: Add RISC-V RV64G native-code backend. (Nicol?s
Ojeda B?r, review by Xavier Leroy and Gabriel Scherer)
? *additional fixes* [8920], [9238], [9239], [9254], [9458]: New API
for statistical memory profiling in Memprof.Gc. The new version
does no longer use ephemerons and allows registering callbacks for
promotion and deallocation of memory blocks. The new API no longer
gives the block tags to the allocation callback.
? [7520], [9547]: Odd behaviour of refutation cases with polymorphic
variants (Jacques Garrigue, report by Leo White, reviews by Gabriel
Scherer and Leo)
? [7741], [9645]: Failure to report escaping type variable (Jacques
Garrigue, report by Gabriel Radanne, review by Gabriel Scherer)
? [9623], [9642]: fix typing environments in
Typedecl.transl_with_constraint (Gabriel Scherer, review by Jacques
Garrigue and Leo White, report by Hugo Heuzard)
? [9610]: manual, C FFI: naked pointers are deprecated, detail the
forward-compatible options for handling out-of-heap
pointers. (Xavier Leroy, review by Mark Shinwell, David Allsopp and
Florian Angeletti)
? [9618]: clarify the Format documentation on the margin and maximum
indentation limit (Florian Angeletti, review by Josh Berdine)
We are expecting this third alpha release to be the last alpha
release.
The compiler can be installed as an OPAM switch with one of the
following commands
?????
? opam switch create ocaml-variants.4.11.0+alpha3 --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git
?????
or
?????
? opam switch create ocaml-variants.4.11.0+alpha3+<VARIANT> --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git
?????
where <VARIANT> is replaced with one of these: afl, flambda, fp,
fp+flambda
The source code for the alpha is also available at these addresses:
[https://github.com/ocaml/ocaml/archive/4.11.0+alpha3.tar.gz]
[https://caml.inria.fr/pub/distrib/ocaml-4.11/ocaml-4.11.0+alpha3.tar.gz]
If you find any bugs, please report them here:
[https://github.com/ocaml/ocaml/issues]
[9440] https://github.com/ocaml/ocaml/issues/9440
[8920] https://github.com/ocaml/ocaml/issues/8920
[9238] https://github.com/ocaml/ocaml/issues/9238
[9239] https://github.com/ocaml/ocaml/issues/9239
[9254] https://github.com/ocaml/ocaml/issues/9254
[9458] https://github.com/ocaml/ocaml/issues/9458
[7520] https://github.com/ocaml/ocaml/issues/7520
[9547] https://github.com/ocaml/ocaml/issues/9547
[7741] https://github.com/ocaml/ocaml/issues/7741
[9645] https://github.com/ocaml/ocaml/issues/9645
[9623] https://github.com/ocaml/ocaml/issues/9623
[9642] https://github.com/ocaml/ocaml/issues/9642
[9610] https://github.com/ocaml/ocaml/issues/9610
[9618] https://github.com/ocaml/ocaml/issues/9618
Roll your own bubblewrap sandboxing scripts in OCaml
????????????????????????????????????????????????????
Archive:
[https://discuss.ocaml.org/t/roll-your-own-bubblewrap-sandboxing-scripts-in-ocaml/6003/1]
Darren announced
????????????????
I recently used a small bit of OCaml code to help generate bash
scripts for sandboxing programs via bubblewrap and have found the
suite to be fairly useful and saved a fair bit of typing.
The repo: [https://github.com/darrenldl/sandboxing]
*Note*: This is not a well packaged project right now, and has no
versioning. I suggest forking the repo if you actually plan on using
it. Might do proper packaging work at some point, however.
Syscall filter handling
???????????????????????
Seccomp BPF compilation (for syscall filter) can also be handled via
the suite in OCaml's side. (If you've seen this project over at
Discord before, then this part is the new addtion that was previously
absent)
? Context: right now bubblewrap only allows specification of syscall
filtering via a compiled BPF file, this is handled by the suite as
follows: `OCaml code --generates--> C code --generates--> BPF
filter'
Firefox example
???????????????
Some code for firefox is as follows
? OCaml side
Firefox profile specification in `bw-script-gen/src/profiles.ml'
?????
? let make_firefox_profile ~(suffix : string option) : profile =
? let name = match suffix with None -> "firefox" | Some s -> "firefox-" ^ s in
? {
? name;
? cmd = "/usr/lib/firefox/firefox --ProfileManager";
? home_jail_dir = Some name;
? syscall_blacklist = default_syscall_blacklist;
? args =
? usr_share_common
? @ usr_lib_lib64_bin_common
? @ etc_common
? @ proc_dev_common
? @ tmp_run_common
? @ sound_common
? @ wayland_common
? @ dconf_common
? @ dbus_common
? @ set_up_jail_home ~tmp:false ~name
? @ [
? Bind ("$HOME/.mozilla", Some "/home/jail/.mozilla");
? Bind ("$HOME/.cache/mozilla", Some "/home/jail/.cache/mozilla");
? Unsetenv "DBUS_SESSION_BUS_ADDRESS";
? Setenv ("SHELL", "/bin/false");
? Setenv ("USER", "nobody");
? Setenv ("LOGNAME", "nobody");
? Setenv ("MOZ_ENABLE_WAYLAND", "1");
? Hostname "jail";
? Unshare_user;
? Unshare_pid;
? Unshare_uts;
? Unshare_ipc;
? Unshare_cgroup;
? New_session;
? ];
? }
?????
? C code
The generated C code for compiling the BPF file can be seen here:
[https://github.com/darrenldl/sandboxing/blob/master/seccomp-bpf/firefox.c]
? Bash script
The generated bash script:
?????
? #!/usr/bin/env bash
?
? set -euxo pipefail
?
? gcc "$(dirname $0)"/../seccomp-bpf/firefox.c -lseccomp -o "$(dirname $0)"/../seccomp-bpf/firefox.exe
? "$(dirname $0)"/../seccomp-bpf/firefox.exe
? mv firefox_seccomp_filter.bpf "$(dirname $0)"/../seccomp-bpf
?
? mkdir -p "$HOME/jails/firefox"
? mkdir -p "$HOME/jails/firefox/Downloads"
?
? bwrap \
? --ro-bind "/usr/share/X11" "/usr/share/X11" \
? --ro-bind "/usr/share/icons" "/usr/share/icons" \
? --ro-bind-try "/usr/share/fontconfig" "/usr/share/fontconfig" \
? --ro-bind "/usr/share/fonts" "/usr/share/fonts" \
? --ro-bind "/usr/share/mime" "/usr/share/mime" \
? --ro-bind "/usr/share/ca-certificates" "/usr/share/ca-certificates" \
? --ro-bind "/usr/share/glib-2.0" "/usr/share/glib-2.0" \
? --ro-bind "/usr/lib" "/usr/lib" \
? --ro-bind "/usr/lib64" "/usr/lib64" \
? --tmpfs "/usr/lib/modules" \
? --tmpfs "/usr/lib/systemd" \
? --symlink "/usr/lib" "/lib" \
? --symlink "/usr/lib64" "/lib64" \
? --ro-bind "/usr/bin" "/usr/bin" \
? --symlink "/usr/bin" "/bin" \
? --symlink "/usr/bin" "/sbin" \
? --ro-bind "/etc/fonts" "/etc/fonts" \
? --ro-bind "/etc/machine-id" "/etc/machine-id" \
? --ro-bind "/etc/resolv.conf" "/etc/resolv.conf" \
? --proc "/proc" \
? --dev "/dev" \
? --tmpfs "/tmp" \
? --tmpfs "/run" \
? --ro-bind-try "/usr/share/gst-plugins-bad" "/usr/share/gst-plugins-bad" \
? --ro-bind-try "/usr/share/gst-plugins-base" "/usr/share/gst-plugins-base" \
? --ro-bind-try "/usr/share/gstreamer-1.0" "/usr/share/gstreamer-1.0" \
? --ro-bind "/run/user/$UID/pulse" "/run/user/$UID/pulse" \
? --ro-bind "/run/user/$UID/wayland-0" "/run/user/$UID/wayland-0" \
? --setenv "QT_QPA_PLATFORM" "wayland" \
? --bind "/run/user/$UID/dconf" "/run/user/$UID/dconf" \
? --ro-bind "/run/user/$UID/bus" "/run/user/$UID/bus" \
? --bind "$HOME/jails/firefox" "/home/jail" \
? --setenv "HOME" "/home/jail" \
? --bind "$HOME/.mozilla" "/home/jail/.mozilla" \
? --bind "$HOME/.cache/mozilla" "/home/jail/.cache/mozilla" \
? --unsetenv "DBUS_SESSION_BUS_ADDRESS" \
? --setenv "SHELL" "/bin/false" \
? --setenv "USER" "nobody" \
? --setenv "LOGNAME" "nobody" \
? --setenv "MOZ_ENABLE_WAYLAND" "1" \
? --hostname "jail" \
? --unshare-user \
? --unshare-pid \
? --unshare-uts \
? --unshare-ipc \
? --unshare-cgroup \
? --new-session \
? --seccomp 10 10<"$(dirname $0)"/../seccomp-bpf/firefox_seccomp_filter.bpf \
? /usr/lib/firefox/firefox --ProfileManager
?????
Second release of Sek
?????????????????????
Archive:
[https://sympa.inria.fr/sympa/arc/caml-list/2020-06/msg00023.html]
Fran?ois Pottier announced
??????????????????????????
We are pleased to announce the second release of Sek, an OCaml library
that offers an efficient implementation of sequences.
The library offers both ephemeral (mutable) sequences and persistent
(immutable) sequences, and offers constant-time conversions between
these flavors.
It supports all of the standard operations on stacks, queues, deques
(e.g. push, pop at either end), catenable sequences (concat, split),
and random access sequences (get, set).
The new release makes a large number of additions to the library's
API. The most significant one is the introduction of very efficient
iterators over ephemeral and persistent sequences. A full list of
changes appears below.
To install the new version of Sek, just type
?????
? opam update && opam install sek.20200618
?????
The API documentation is online:
[http://cambium.inria.fr/~fpottier/sek/doc/sek/Sek/]
Feedback is welcome!
Arthur Chargu?raud and Fran?ois Pottier
2020/06/18
??????????
? The time complexity of every operation is now documented as part of
its specification.
? New submodules `E.Iter' and `P.Iter', which offer very efficient
iterators over ephemeral and persistent sequences.
? New functions `take', `drop', `sub', `iter_segments', `to_seq',
`of_list_segment', `of_list', `of_seq_segment', `of_seq', `find',
`find_opt', `find_map', `for_all', `exists', `mem', `memq', `map',
`mapi', `rev', `zip', `unzip', `filter', `filter_map', `partition',
`flatten', `flatten_map', `iter2', `iter2_segments', `fold_left2',
`fold_right2', `map2', `for_all2', `exists2', `equal', `compare',
`sort', `stable_sort', `uniq', `merge', in ephemeral and persistent
flavors.
? New functions `E.fill' and `E.blit'.
? New function `other' of type `side -> side'.
? New function `opposite' of type `direction -> direction'.
? New functor `SupplyDefault', which allows supplying a default
element once and for all so as to obtain a simpler
API. Unfortunately, this requires choosing a fixed type of elements
at the same time.
? New submodules `Emulated.Array' and `Emulated.List', which can be
used as drop-in replacements for OCaml's standard `Array' and `List'
modules.
? New submodule `Segment', which offers a few facilities for iterating
over array segments.
? *Breaking change:* the default behavior of `E.copy' is now to
produce a disjoint sequence in time `O(n)'. The previous behavior,
which exploits sharing and produces a result in time `O(K)', is
obtained by invoking `E.copy ~mode:`Share'. The two copying modes
have the same observable behavior; they differ only in their
performance characteristics.
? *Breaking change:* the submodules `Queue' and `Stack' are renamed
`Emulated.Queue' and `Emulated.Stack'. This makes it easier to
avoid unintended shadowing of `Stdlib.Queue', `Stdlib.Stack',
etc. It is now safe to use `open Sek'.
? *Breaking change:* the functor `Make' now takes just one structure
as a parameter, instead of several structures. This is more
pleasant and should make future evolution easier.
Tools or pointers for control flow analysis of OCaml code?
??????????????????????????????????????????????????????????
Archive:
[https://discuss.ocaml.org/t/tools-or-pointers-for-control-flow-analysis-of-ocaml-code/3805/4]
Anton Kochkov announced
???????????????????????
Just a heads up - there is a work going on adding OCaml to GitHub
Semantic, see the corresponding PRs:
? [https://github.com/tree-sitter/tree-sitter-ocaml/pull/37]
? [https://github.com/tree-sitter/haskell-tree-sitter/pull/283]
Once these are merged, it will be possible to start adding Semantic
support itself.
A new build system API in Dune: please send thoughts, ideas and wishes
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Archive:
[https://discuss.ocaml.org/t/a-new-build-system-api-in-dune-please-send-thoughts-ideas-and-wishes/6012/1]
J?r?mie Dimino announced
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Do you have ideas about what a good build API should look like? Are
there functionalities you always wished a build system API would give
you?
If yes, please write your thoughts, ideas or wishes on the following
github ticket: [https://github.com/ocaml/dune/issues/3571]
To give a bit more context, the Dune team is preparing to design a new
build system API. This API is what comes in between the core build
system engine and the build rules explaining how to go from .ml files
to a final executable. The main motivation for doing this work now is
to help migrating from Jenga to Dune inside Jane Street. However,
eventually we would like to open this API to users, so that everyone
can write their own set of build rules outside of Dune. For this
reason, we'd like to open the discussion to the community.
Other OCaml News
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From the ocamlcore planet blog
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Here are links from many OCaml blogs aggregated at [OCaml Planet].
? [Really low latency multipliers and cryptographic puzzles]
? [Every proof assistant: Cur - Designing a less devious proof
assistant]
[OCaml Planet] http://ocaml.org/community/planet/
[Really low latency multipliers and cryptographic puzzles]
https://blog.janestreet.com/really-low-latency-multipliers-and-cryptographic-puzzles/
[Every proof assistant: Cur - Designing a less devious proof assistant]
http://math.andrej.com/2020/06/22/cur-designing-a-less-devious-proof-assistant/
Old CWN
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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
archives].
If you also wish to receive it every week by mail, you may subscribe
[online].
[Alan Schmitt]
[send me a message] mailto:alan.schmitt at polytechnique.org
[the archive] http://alan.petitepomme.net/cwn/
[RSS feed of the archives] http://alan.petitepomme.net/cwn/cwn.rss
[online] http://lists.idyll.org/listinfo/caml-news-weekly/
[Alan Schmitt] http://alan.petitepomme.net/
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