Rustfmt: Raw identifier sorting

🚧 The 2024 Edition has not yet been released and hence this section is still "under construction".

More information may be found in the tracking issue at https://github.com/rust-lang/rust/issues/124764.

Summary

rustfmt now properly sorts raw identifiers.

The Rust Style Guide includes rules for sorting that rustfmt applies in various contexts, such as on imports.

Prior to the 2024 Edition, when sorting rustfmt would use the leading r# token instead of the ident which led to unwanted results. For example:

use websocket::client::ClientBuilder;
use websocket::r#async::futures::Stream;
use websocket::result::WebSocketError;

In the 2024 Edition, rustfmt now produces:

use websocket::r#async::futures::Stream;
use websocket::client::ClientBuilder;
use websocket::result::WebSocketError;

The change can be applied automatically by running cargo fmt or rustfmt with the 2024 Edition.

With a Cargo.toml file that has edition set to 2024, run:

cargo fmt

Or run rustfmt directly:

rustfmt foo.rs --style-edition 2024