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

submitted 21 hours ago* (last edited 19 hours ago) by [email protected] to c/[email protected]

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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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[–] [email protected] 23 points 16 hours 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 😅.

[–] [email protected] 1 points 6 hours ago

This is excellent content

[–] [email protected] 2 points 9 hours 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.

[–] [email protected] 9 points 15 hours ago (1 children)

What madness caused this

[–] [email protected] 17 points 15 hours ago

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.