add rustfmt sorting

Author: calebcartwright

src/SUMMARY.md

@@ -49,6 +49,7 @@
   - [Cargo: Reject unused inherited default-features](rust-2024/cargo-inherited-default-features.md)
   - [Rustfmt: Combine all delimited exprs as last argument](rust-2024/rustfmt-overflow-delimited-expr.md)
   - [Rustfmt: Raw identifier sorting](rust-2024/rustfmt-raw-identifier-sorting.md)
+  - [Rustfmt: sorting](rust-2024/rustfmt-sorting.md)
   - [`gen` keyword](rust-2024/gen-keyword.md)
   - [Macro fragment specifiers](rust-2024/macro-fragment-specifiers.md)
   - [Missing macro fragment specifiers](rust-2024/missing-macro-fragment-specifiers.md)

src/rust-2024/rustfmt-sorting.md

@@ -0,0 +1,43 @@
+# 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 issues at <https://github.com/rust-lang/rust/issues/123800> and <https://github.com/rust-lang/rust/issues/123802>.
+
+## Summary
+
+`rustfmt` utilizes a new sorting algorithm.
+
+## Details
+
+The [Rust Style Guide] includes [rules for sorting][sorting] that `rustfmt` applies in various contexts, such as on imports.
+
+Previous versions of the Style Guide and Rustfmt generally used an "ASCIIbetical" based approach. In the 2024 Edition this is changed to use a version-sort like algorithm that compares Unicode characters lexicographically and provides better results in ASCII digit comparisons.
+
+For example with a given (unsorted) input:
+
+```rust,ignore
+use std::num::{NonZeroU32, NonZeroU16, NonZeroU8, NonZeroU64};
+use std::io::{Write, Read, stdout, self};
+```
+
+In the prior Editions, `rustfmt` would have produced:
+
+```rust,ignore
+use std::io::{self, stdout, Read, Write};
+use std::num::{NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8};
+```
+
+In the 2024 Edition, `rustfmt` now produces:
+
+```rust,ignore
+use std::io::{self, Read, Write, stdout};
+use std::num::{NonZeroU8, NonZeroU16, NonZeroU32, NonZeroU64};
+```
+
+[Rust Style Guide]: ../../style-guide/index.html
+[sorting]: ../../style-guide/index.html#sorting
+
+## Migration
+
+The change can be applied automatically by running `cargo fmt` or `rustfmt` with the 2024 Edition.