You see, that's the point - even if you do something as simple, there are many ways to do it (and different compiler versions, especially in the case of D), different optimizations at the code and compiler level and all that - it's practically impossible to have a reliable, comprehensive benchmark.

(That said, D is lightning fast for me!)

HashSet uses a cryptographically secure hashing algorithm by default, it’s gonna be slow.

What's the Rust equivalent of Go maps or D associative arrays then?

The Rust HashMap and HashSet implementations are generic over hasher: you can pick a faster one if you don't have to worry about getting ddos'd. Last I checked, the go-to fast hasher was fnv: https://doc.servo.org/fnv/

How often do I need to explain that this siphash claim of DDOS protection is utter nonsense. siphash can easily be brute forced like every insecure hash function (<256 bits), and proper DDOS protection can only be provided by a proper collision strategy. Even DJB himself does so.

Well, it's not in the standard lib and I couldn't get my program to compile. Compare that to D or Go, where you don't have to fight the copiler.

Rust has a different take on the standard library than many other languages. It's kept quite minimal, because it's trivial to use a package.

Is there any way to use it directly in the source w/o having to create a Crate.toml and src dirs? Is there a getting started document? Dub recently included such a feature.

That's the hard way. `cargo new` generates both for you, so you don't need to do any of that stuff manually.

If you really, really want to, you could use https://crates.io/crates/cargo-script to do the way you're talking about.

https://doc.rust-lang.org/cargo/ has installation, getting started, a reference, all of that. It needs some work, but for the basics of doing this, it's got it all.

Yup, this is 100% correct.