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xav

@xavxav

@xldenis on the other one phd in making programs less wrong

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28.09.2023
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Latest posts by xav @xavxav

I want a version of this with “Mercator invents a new map for navigation” to “France nukes a us aircraft carrier over Greenland”

09.03.2026 18:44 👍 0 🔁 0 💬 0 📌 0

I would play both of these games so much

08.03.2026 15:55 👍 5 🔁 0 💬 1 📌 0
Preview
Nuclear Design Bureau on Steam Design. Detonate. Survive. As the Chief Engineer of the Kurchatov Institute, you must design atomic devices to satisfy the demands of the State. A hardcore physics-based puzzle game simulating hydrody...

store.steampowered.com/app/4190240/...

08.03.2026 15:07 👍 36 🔁 3 💬 2 📌 0

asking follow-up questions remains undefeated

04.03.2026 21:10 👍 5 🔁 0 💬 0 📌 0

Setting up a gitlab has become a recurring joke at work in response to outages but it might remain a joke for long at this rate

04.03.2026 17:46 👍 2 🔁 0 💬 0 📌 0
Post image

** Speaker announcement ** We’re taught to believe that iterators are zero cost. But what happens when they aren’t? Xavier Denis explains, at RustWeek 2026!
Info & tickets: 2026.rustweek.org/talks/xavier/

See you in Utrecht May 18-23, 2026!

@xavxav.bsky.social

#rustweek2026 #rustlang

03.03.2026 10:40 👍 2 🔁 2 💬 0 📌 0

Using LLMs and techniques like SysGuS you could help users iterate on languages by exploring what their rules permit and suggest refinements to capture/exclude edge cases that weren’t considered.

13.02.2026 10:42 👍 1 🔁 0 💬 0 📌 0

I’ve long had this idea for a PL ide which would let you co-design syntax, types and semantics and llms/generative techniques would be a core component. We should be able to build rigorous languages more quickly, my internal benchmark is « a mini rust in an afternoon »

13.02.2026 10:41 👍 1 🔁 0 💬 1 📌 0

let me know how it goes and whether I can help with anything!

04.02.2026 17:48 👍 0 🔁 0 💬 0 📌 0

I would contact the creusot team on gh/zulip I’m sure they could provide guidance

02.02.2026 19:20 👍 2 🔁 0 💬 0 📌 0

Well at least in creusot those are the same!

02.02.2026 18:47 👍 2 🔁 0 💬 1 📌 0

If you want to work on recursive proofs you could also look at tools capable of unbounded reasoning like creusot/aeneas/verus.

02.02.2026 17:52 👍 3 🔁 0 💬 2 📌 0
Preview
GitHub - creusot-rs/creusot: Creusot helps you prove your code is correct in an automated fashion. Creusot helps you prove your code is correct in an automated fashion. - creusot-rs/creusot

Curious what you’re trying to verify and why, and maybe you should try GitHub.com/creusot-rs/creusot :p

02.02.2026 17:51 👍 2 🔁 0 💬 1 📌 0

does anyone have a rule of thumb for kloc/s compiled by rustc?

30.01.2026 09:38 👍 0 🔁 0 💬 0 📌 0

C’est bon signe quand la justice se trouve contraint d’inventer sa propre police non?

28.01.2026 08:27 👍 0 🔁 0 💬 0 📌 0

Théoriquement un juge peut nommer n’importe quelle personne comme député si les marshals refusent (utilisé dernièrement pendant la guerre civile)

28.01.2026 08:24 👍 0 🔁 0 💬 1 📌 0
While I may not think a total ban of US-based social media platforms (and TikTok) makes sense in the short term, that doesn’t mean I feel that way about X. We need to remember that the influence of X has long been exaggerated because it was where politicians and the media hung out, and that position has been even further eroded since Musk’s takeover. Given that it is actively enabling the creation of non-consensual deepfakes and child sexual abuse material, not to mention its broader amplification of right-wing narratives, the only real option in my mind is for people to leave, if not for governments to ban it, so that influence is eroded even further. Replacing X is a much less of an ordeal than finding an alternative to Facebook or Instagram.

While I may not think a total ban of US-based social media platforms (and TikTok) makes sense in the short term, that doesn’t mean I feel that way about X. We need to remember that the influence of X has long been exaggerated because it was where politicians and the media hung out, and that position has been even further eroded since Musk’s takeover. Given that it is actively enabling the creation of non-consensual deepfakes and child sexual abuse material, not to mention its broader amplification of right-wing narratives, the only real option in my mind is for people to leave, if not for governments to ban it, so that influence is eroded even further. Replacing X is a much less of an ordeal than finding an alternative to Facebook or Instagram.

I think it would be politically difficult to ban all these major social media platforms overnight, but X is one that should go now — not just over Grok and deepfakes, but also the way Elon Musk has leveraged it to push far-right politics.

disconnect.blog/x-shows-why-...

23.01.2026 21:28 👍 50 🔁 7 💬 2 📌 2

In terms of coursework probably a greater focus on the pragmatics of PL? The _design_ aspect of language development

22.01.2026 13:55 👍 0 🔁 0 💬 1 📌 0

There’s also whole domains not properly captured in PL. I keep thinking what the role for PL in distributed systems is.

22.01.2026 13:53 👍 1 🔁 0 💬 2 📌 0

I think the design space for an agent friendly language is far from settled. How do make a language such that reviewing code is 10x easier (since you’ll need to review 10x more code)?

22.01.2026 13:52 👍 0 🔁 0 💬 2 📌 0

French doesn’t have a word for dumpling so we call them all raviolis

22.01.2026 13:50 👍 3 🔁 0 💬 2 📌 0

My understanding is that this is where zig is trending with io (and already doing w alloc)

22.01.2026 13:39 👍 1 🔁 0 💬 1 📌 0

Écoute, je suis d’accord sur le fond! Mais il y a un vrai travail de préparation qui aurait besoin d’avoir lieu et qui ne se passe pas actuellement. Je ne suis pas fataliste, les opinions se changent mais je pense qui si demain on interdisait Meta cela serait très mal reçu et risque la réaction

20.01.2026 10:30 👍 0 🔁 0 💬 2 📌 0

Pour que ça marche il faudrait connecter meta avec le gouv américain dans l’esprit publique, chose qui n’est pas acquise. Et rendre le sacrifice soutenable (et perdre contacte avec la famille/amis c’est pas rien!).

20.01.2026 09:51 👍 1 🔁 0 💬 0 📌 0

Ok mais soyons honnête quel pourcentage de la population française utilise signal? De toute façons c’est pas un remplacement: je _veux_ voir les stories/posts de mes amis. Une interdiction de Meta est un acte politique et doit être conçu comme tel et non d’un pdv moralisateur

20.01.2026 09:49 👍 0 🔁 0 💬 2 📌 0

Justifier une sanction sur X c’est facile au choix: pedopornographie,nazisme,proximité au régime,influence sur les élections françaises.
Pour Meta tu dois expliquer pourquoi personne peut parler avec leurs amis comme d’hab. faisable mais nettement plus difficile.

20.01.2026 09:02 👍 0 🔁 0 💬 0 📌 0

Ça serait sans doute mieux en net, mais Instagram est très populaire, suffit de voir le Népal/madagascar sur ce qui se passe quand on coupe. Je sais que insta c’est le seul réseau que j’ai en commun avec tout mes amis.

20.01.2026 08:57 👍 0 🔁 0 💬 1 📌 0

Justement comme j’ai dit dans mon autre réplique je pense que meta c’est un peu compliqué car c’est plus difficile à expliquer pourquoi on ne peut plus parler avec des amis/famille etc.. X par contre? C’est juste des journalistes et politiques.

20.01.2026 08:54 👍 0 🔁 0 💬 1 📌 0

À la place je commencerai par X c’est une petite plate-forme très affilié à la droite américaine. Ça aurait peu d’impact économique mais un immense impact psychique. Meta au contraire est très intégré (WhatsApp, insta) et cela serait difficile pour bcp de français (donc politiquement difficile)

20.01.2026 08:51 👍 0 🔁 0 💬 1 📌 0

Après ça pourrait être fait en retaliation. Par contre je pense que Amazon & Microsoft s’y opposerait par intérêt vénale, ils savent que cela voudrait dire la fin du cloud/office en Europe.

20.01.2026 08:47 👍 0 🔁 0 💬 2 📌 0