Derive Conventions
Alphabetically sort #[derive] attributes.
This isn't done by rustfmt because there could be code differences if you reorder derives, see: https://github.com/rust-lang/rustfmt/issues/4112.
First all attributes from the std library unprefixed, then traits from external crates prefixed with the crate name.
Use crate prefixed #[derive] attributes
Using the prefixing means the derives will be unambiguous. (Many crates reuse the name Serialize and Deserialize).
This means if you want to derive serde::Serialize.
// Instead of this,
use serde::Serialize;
#[derive(Serialize)]
struct Foo {
x: i32,
y: i32,
}// use this.
#[derive(serde::Serialize)]
struct Foo {
x: i32,
y: i32,
}
Comments should go before derives.
Comments can get large, it's possible to miss a derive if it's above the comments.