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What are some mind blowing Rust tricks? (programming.dev)

submitted 3 weeks ago* (last edited 3 weeks ago) by little_ferris@programming.dev to c/rust@programming.dev

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If we were to create a Rust version of this page for Haskell, what cool programming techniques would you add to it?

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[–] SorteKanin@feddit.dk 29 points 3 weeks ago (3 children)

Not exactly the same thing but this is still pretty funny. This is code that is technically 100% legal Rust but you should definitely never write such code 😅.

[–] AsudoxDev@programming.dev 11 points 3 weeks ago (1 children)

What madness caused this

[–] SorteKanin@feddit.dk 22 points 3 weeks ago (1 children)

It's a test for the compiler which ensures that these legal yet extremely weird expressions continue to compile as the compiler is updated. So there is a purpose to the madness but it does still look pretty funny.

[–] nilloc@discuss.tchncs.de 8 points 2 weeks ago

That’s make sense. We used to write some ridiculous tests too, but users still managed to find a way


fn union() {
    union union<'union> { union: &'union union<'union>, }
}

Is my favorite.

[–] barsoap@lemm.ee 6 points 3 weeks ago* (last edited 2 weeks ago)

That makes complete sense. Ranges implement fmt::Debug, .. is a range, in particular the full range (all values) ..= isn't because the upper bound is missing but ..=.. ranges from the beginning to the... full range. Which doesn't make sense semantically but you can debug print it so add a couple more nested calls and you get a punch card.

I totally didn't need the Rust playground to figure that out.

EDIT: Oh, glossed over that: .. is only the full range if standing alone, it's also an infix operator which is why you can add as many as you want (be careful with whitespace, though). .. .. .. .. .. .. .. .. .. .. is a valid Rust expression.

[–] silasmariner@programming.dev 4 points 3 weeks ago

This is excellent content