"Hello world" example doesn't compile...

[steveklabnik]

• I have looked for existing issues (including closed) about this

Bug Report

https://docs.rs/axum/latest/axum/ has a "Hello world", but if you try it, by default it doesn't work.

Version

0.6.2

Platform

Description

$ cargo build
error[E0433]: failed to resolve: use of undeclared crate or module `tokio`
 --> src\main.rs:6:3
  |
6 | #[tokio::main]
  |   ^^^^^ use of undeclared crate or module `tokio`

error[E0752]: `main` function is not allowed to be `async`
 --> src\main.rs:7:1
  |
7 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

Adding a cargo add tokio --features macros,rt-multi-thread fixes this, but I had to figure it out myself, and I'm still not 100% that that runtime feature is what I'm supposed to be using here.

Adding something about this into the documentation to help guide new users would be great.

[jplatte]

rt-multi-thread is right, but I agree the docs could be more helpful here.