Rust Code Style

This skill holds the layout and readability decisions that rustfmt cannot make. rustfmt owns line width, brace placement, wrapping, and the sort order inside each contiguous block of mod declarations or use imports. The rust-lints skill owns clippy.toml, rustfmt.toml, and the workspace lint tables. The rust-crate-architecture skill owns crate boundaries and dependency direction.

Most rules here are catalog defaults, not Rust facts. Each one carries its reason, so a team can override it on purpose. The flat_map and lines() rules are exceptions: they prevent lost errors and hangs, so they hold everywhere.

Checks

Use the tool where one exists. Review the rest by hand with the checklist.