R CMD check and CRAN's Rust policy

You seem to be taking a confontational tone, which isn't likely to
encourage a reasonable dialogue.

I've looked for other messages on this, and didn't see any besides this
one explaining why including check_rust() in the checks is a problem.
The problem you talk about here is that it encourages vendoring, which
makes it harder for package authors to count downloads.

To be honest, that doesn't seem like a very serious problem.  I assume
the packages ("crates") we are talking about are open source, so this is
entirely in the spirit of how they are allowed to be distributed.

If they aren't open source, then users of those packages should be
warned about that, and a check failure is a good way to do that.

So you need to explain why it is important to be able to download and
install software and not be warned about it.

I am not in R Core or CRAN, but I can suggest why it is better to
include source in the package:  it makes the use of that package more
reliable in the future.  It's not uncommon to run an R computation that
was written a few years ago.  Sometimes libraries or R have changed, and
a user will need to go back to a previous version to reproduce the
calculation.  Being able to able to rebuild a system as it would have
been back then is important.

Is that possible if the package needs to make a download?  The download
site that worked a few years ago may no longer exist.  If the site
exists, the code versions there may be different.

Those are some of the issues that Simon was alluding to.

Duncan Murdoch



On 2025-03-02 5:45 a.m., Mossa Merhi Reimert via R-devel wrote:

Dear Simon Urbanek,

There has been very little engagement with the issue I referred to. If

it was decided that this ?check? ought to be part of the default checks for
R,

then that could have been written to us. Either on the

bugs.r-project.org or the proposed patch. Before we talk about anything
else,

it does seem very strange that we cannot get a reasonable dialogue going.

I would like to say that the R/Rust community has grown substantially.

From my end, there are 3 bindings project, extendr, savvy, and roxido.

Then, there are now many rust-based packages on CRAN, see this most

recent compiled list https://github.com/nanxstats/r-rust-pkgs.

There is also proof-of-concept https://github.com/r-rust/hellorust that

integrates `cargo`, rust?s official build system, with R?s package build
system,

and https://github.com/extendr/hellorustc, which showcases how Rust

compiler could be directly linked with R?s package system.

  Let me say, that the current R CMD check is not meant to be ?helpful?.

When a package is built, `cargo` tells the user ?Downloading crates?.

Thus, this information is already conveyed to the user.

Personally, I do wish we could debate this requirement further. I do not

believe that having R-packages on CRAN vendor rust dependencies

as a good policy. Download statistics is a success metric of a given

r-package and rust packages. By insisting on vendoring, and thus

side-stepping `cargo` / crates.io, we are robbing upstream authors of

their download-numbers. I do not think such policy is honourable.

While C/C++ do not have official package repositories, it could be

thought of, as fair game, to have CRAN act as a pseudo package manager for
C/C++ libraries.

I?m not going to argue for or against this part.

There are many objections from the CRAN side to all things related to

Rust. I don?t want to open multiple topics in the same thread.

But there is plenty to bring up. And I had hoped we could talk this

little issue through, before embarking on a larger discussion.

I do not appreciate the ?random demands? comment, as this is not a

demand, nor is it random.

I have inquired my end of the community for suggestions
to compile a larger proposal, but then I was afraid that this would be

perceived as a big, bulky demand.

Rust is not C/C++/Java, and the support for Rust cannot look like the

support for these languages.

From: Simon Urbanek <simon.urbanek at R-project.org>
Date: Sunday, 2 March 2025 at 00.39
To: Mossa Merhi Reimert <mossa at sund.ku.dk>
Cc: r-devel at r-project.org <r-devel at r-project.org>
Subject: Re: [Rd] R CMD check and CRAN's Rust policy
[Du f?r ikke ofte mails fra simon.urbanek at r-project.org. F? mere at

vide om, hvorfor dette er vigtigt, p?
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Mossa,

the issue you cite is lacking any pertinent information and it's not

even clear why it should be an issue. The check is perfectly justified, it
just reports whether a package using rust declares this correctly and where
it downloads 3rd party content - something that is important to R users in
general and not related to CRAN. I don't see how any of this is
"prohibitive" it just calls out what the package is already doing.

As discussed before, my hope was that the "R"ust community will mature

enough to work on proper support. It is not clear that it happened yet, but
once it does it would make sense to talk about support just as we have for
C, C++ and Java, so certainly that should be the right discussion. However,
it will have to start with some thinking and a proposal on how the
associated issues (compiler support, versioning, dependency sources etc.)
are to be addressed, as opposed to making random demands. All this has
nothing to do with CRAN so the issue you mention seems irrelevant to the
progress. Also I'd like to know what are the "challenges embedded in R
itself".

Cheers,
Simon

On Mar 2, 2025, at 8:45 AM, Mossa Merhi Reimert via R-devel <

r-devel at r-project.org> wrote:

Hello everyone!

I'm Mossa, I'm one of the maintainers of extendr, an automated

generation of bindings project for

Rust code, for use in R-packages.

I'm writing to you, as R 4.4.3 was just released, and there have not

been

follow-up on an issue important to us. Link to the issue as discussed

on r-devel

https://stat.ethz.ch/pipermail/r-devel/2024-October/083666.html

A community member has provided a suggestion to a patch here

https://github.com/r-devel/r-svn/pull/182, and we have also attempted to
bring it up on

Bugzilla: https://bugs.r-project.org/show_bug.cgi?id=18806

TLDR: Default `R CMD check` uses additional CRAN-specific checks for

Rust,

instead of keeping this behind the --as-cran flag.

I would like to say, that there is a growing interest in Rust within

the R community.

And generally, Rust becoming a widely adopted language within the

Python community (including the scientific part of that community). It is
time to deal with the

pain points with using Rust in R.

Therefore, I would kindly ask that we have a dialogue on how to remedy

the issue above first, and how we may deal with other issues going forward.
There are both challenges embedded in R itself, and the current CRAN policy
for Rust is prohibitive.

Mossa Merhi Reimert
Postdoctoral Researcher

K?benhavns Universitet
Department of Veterinary and Animal Sciences
Animal Welfare and Disease Control
Gr?nneg?rdsvej 8
1870 Frederiksberg C
Denmark

+45 35324135
mossa at sund.ku.dk<mailto:mossa at sund.ku.dk>


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