[johnnyjeans]

This is a good post and I agree with it in full, but I just wanted to point out that (safe) Rust is safer from data races than, say, Haskell due to the properties of an affine type system.

Haskell in general is a much safer than Rust thanks to its more robust type system (which also forms the basis of its metaprogramming facilities), monads being much louder than unsafe blocks, etc. But data races and deadlocks are one of the few things Rust has over it. There are some pure functional languages that are dependently typed like Idris, and thus far safer than Rust, but they're in the minority and I've yet to find anybody using them industrially. Also Fortnite's Verse thing? I don't know how pure that language is though.

[chowells]

I don't think it's true that Rust is safer, using the terminology from the article. Both languages prevent you from doing things that will result in safety violations unless you start mucking with unsafe internals.

Rust absolutely does make it easier to write high-performance threaded code correctly, though. If your system depends on high amounts of concurrent mutation, Rust definitely makes it easier to write correct code.

On the other hand, a system like STM in Haskell can make it easier to write complex concurrency logic correctly in Haskell than Rust, but it can have very bad performance overhead and needs to be treated with extreme suspicion in performance-sensitive code. It's a huge win for simple expression of complex concurrency, but you have to pay for it somewhere. It can be used in ways where that overhead is acceptable, but you absolutely need to be suspicious in a way that's never a concern in Rust.