documentation issues

[dynnamitt]

Background

rustc 1.59.0

When Learning to use "rand" I tend to end up in a loop of frustration that I must address.
In my quest as a (rust) newbie I tried following the code snippets in your book , I end up with "failed to resolve" at times :

Rand Book

StdGen snippets works fine,
But how do I "use" SmallRng or ChaCha20Rng, usually "failed to resolve" no matter what I try.

I seems my Cargo.toml / dependencies is missing something, or is it the sample snippet missing "use" ?
How many dependencies (with options) do I need for each sample snippet.. could this be more specific perhaps?

[dynnamitt]

A perfect solution for me at least I think is if someone added:

"this is how your Cargo.toml must look like to run EVERY sample code block inside this book: ..."

[dhardy]

So, SmallRng is behind a feature flag, hence you need something like this:

rand = { version = "0.8", features = ["small_rng"] }

ChaCha is in another crate, so you need to depend on that:

rand_chacha = "0.3"

Then, you can e.g.:

use rand_chacha::ChaCha8Rng;

Does this answer your questions? If so, it would be useful to get more specific feedback on how to include this in the book (or even if you make a pull request yourself: https://github.com/rust-random/book/pulls). My perspective is a little different than yours, hence it's not always obvious to me what is missing.

[dynnamitt]

Thanks!,
I think my comment above is one suggestion , I'm not rusty enough to comfortably pull-request accurate text, instead I have to learn more about feature options in the toml etc :)