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Mostly a Rust hacker

Interests: Reversible programming, HTTP Live Streaming and derivatives, FreeBSD
My train is on the plan again after a long summer.

This cuts down my transport time down to less than half of what it has been the last few months. 🚂
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@ma3ke I am just imagining a big letterpress that runs continuously
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re: Selfie, EC
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@freya Here the sun was free for clouds for the whole duration except the highpoint ±2 minutes :( though still got a nice view of it the rest of the time :)
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I have been thinking a lot about the RangeFrom type (n..) in Rust so I thought I would write up a bunch of history about to have somewhere to start a further discussion about it: https://erk.dev/2026/08/12/rangefrom-part-1
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I was asked recently about the cost of running a (#rustlang) conference and why the ticket prices are what they are. We figured we can just publicly share the numbers for RustWeek, in the name of . :)

RustWeek has many subevents (conference, hackathon, unconference, workshops, Rust All Hands, etc.), but I've tried to extract just the two day conference part of RustWeek 2026:

Venue rent: € ~50k
Lunch, snacks, drinks two full days: € ~130k (incl. catering services and exclusive access to 1000 person restaurant all day)
A/V services: € ~30k (incl. livestreaming, professionals operating the cameras/microphones/screens in the rooms, editing the recordings, etc.)
Stuff we set up at the venue: € ~20k (sponsor booths, entertainment, banners, stickers, wifi, etc.)
Travel compenstation for speakers: € ~10k
External services: € ~25k (accounting, registration & payment, event management, insurance, etc.)
Miscelaneous: € ~15k

This adds up to roughly € 280k for just the two conference days. (The total for all of RustWeek is ~€ 400k.)

The money we get from sponsors covers roughly half of the costs. The other half has to be covered by tickets.

We are currently the biggest Rust conference with 850+ attendees. We give free tickets to all the speakers and volunteers, which is almost a hundred people total. The sponsor packages also include a total of roughly 100 tickets. That leaves ~650 sold tickets.

Those are roughly 250 corporate tickets (~410 euro after tax), 300 individual tickets (~190 euro after tax), and 100 student tickets (~30 euro after tax). Accounting for the various discounts (early bird, discount codes, etc.) and overhead, this leaves us with roughly 140k.

Those student tickets are sold at a significant loss, but it's very important to us to not just run this conference for those with a well paid job.

Setting the ticket prices is very tricky, because you have to set them a year in advance, before you know what amount of sponsorship to expect. We only find out *after* the event if we guessed correctly or if we ran at a loss. This year, we made a (very small) profit, which we'll spend on our Rust Maintainers Team: https://rustnl.org/maintainers/

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SMK – Statens Museum for Kunst

Gudskelov for Wikipedia!
Vi er glade for åbenhed, og i de sidste 15 år har SMK haft stor glæde af Wikipedia. Samlingen er fornemt repræsenteret, og har igennem årene bevæget sig ud på over 9.000 forskellige opslag på det store, fælles onlineleksikon.
Hvilke værker bruges mest? Tak for spørgsmålet, for vi har netop kigget dybt i statistikken. Og det drejer sig om:

🖼️ Cornelis Cornelisz. van Haarlem, Titanernes fald, 1588 – 1590.
🖼️Nicolai Abildgaard, Hamlet hos sin moder, 1776 – 1779
🖼️C.A. Lorentzen, Dannebrog falder ned fra himlen under Volmerslaget ved Lyndanisse (Tallin) i Estland den 15. juni 1219, 1809
🖼️ Henri Matisse, Selvportræt, 1906

Samlet vises SMK-kunst omkring 2.2 millioner gange om måneden på Wikipedia 👌

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@ma3ke The diffraction makes the lights very pretty, it nearly makes it seem unreal. Great photos!
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@maya I feel like I always went the complete different direction where every year when it sounded I would down a research hole and read up on it everywhere I could. To this day I still look after the sirens when I am walking around.
But I can see how they are possible to find scary if you don't know about it, I was a bit surprised the first time I heard them in the Netherlands, but I had some coworkers who could tell me that it was normal.
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@ma3ke In Denmark they are only tested once per year with sound, when I lived in NL I remember that we used it as the lunch alarm (well the one day per month) which it works well as.
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@maya Its such a great way, its how I have been learning Linux for the past decade :P
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@maya that is when the withdrawal symptoms begin to show
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Imagine organizing a Rust conference and having zero women on stage. That's just embarrasing. https://oxidizeconf.com/

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@aDot for _reasons_ I have been looking into the history of the range types and a pretty interesting thing I fell over was the exact comment that is the reasons for that impl https://github.com/rust-lang/rust/issues/19794#issuecomment-66860712 the early days of rust did not have as much rigor as there is today, which maybe was a good thing at the time to actually finish a release.
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@q Can you set the numeric IP instead?
Like for those two it would be:
U32 IP for [192, 168, 88, 5]: 3232258053
U32 IP for [255, 255, 255, 0]: 4294967040

( small playground to calculate them as I could not find a thing online for it: https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=613c59bcfe48840216cf1f2f70e2a704 )
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This months meetup is up. Looking forward to seeing everyone :)

https://www.meetup.com/copenhagen-rust-community/events/315767999

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Now I can finally commit Rust code crimes legally. 😌

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A post by @Mara have been stuck in my head for about two months now so I just had to write out my thoughts on what the most central railway station in the Netherlands is: https://erk.dev/2026/06/21/the-most-central-station-in-nl
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Took a cool self-portrait of me on the boat at dusk.

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