Rust Coding Guidelines (50 Core Rules) Skill

Rust Coding Guidelines (50 Core Rules)

Naming (Rust-Specific)

| Rule | Guideline | |------|-----------| | No get_ prefix | fn name() not fn get_name() | | Iterator convention | iter() / iter_mut() / into_iter() | | Conversion naming | as_ (cheap &), to_ (expensive), into_ (ownership) | | Static var prefix | G_CONFIG for static, no prefix for const |

Data Types

| Rule | Guideline | |------|-----------| | Use newtypes | struct Email(String) for domain semantics | | Prefer slice patterns | if let [first, .., last] = slice | | Pre-allocate | Vec::with_capacity(), String::with_capacity() | | Avoid Vec abuse | Use arrays for fixed sizes |

Strings

| Rule | Guideline | |------|-----------| | Prefer bytes | s.bytes() over s.chars() when ASCII | | Use Cow<str> | When might modify borrowed data | | Use format! | Over string concatenation with + | | Avoid nested iteration | contains() on string is O(n*m) |

Error Handling

| Rule | Guideline | |------|-----------| | Use ? propagation | Not try!() macro | | expect() over unwrap() | When value guaranteed | | Assertions for invariants | assert! at function entry |

Memory

| Rule | Guideline | |------|-----------| | Meaningful lifetimes | 'src, 'ctx not just 'a | | try_borrow() for RefCell | Avoid panic | | Shadowing for transformation | let x = x.parse()? |

Concurrency

| Rule | Guideline | |------|-----------| | Identify lock ordering | Prevent deadlocks | | Atomics for primitives | Not Mutex for bool/usize | | Choose memory order carefully | Relaxed/Acquire/Release/SeqCst |

Async

| Rule | Guideline | |------|-----------| | Sync for CPU-bound | Async is for I/O | | Don't hold locks across await | Use scoped guards |

Macros

| Rule | Guideline | |------|-----------| | Avoid unless necessary | Prefer functions/generics | | Follow Rust syntax | Macro input should look like Rust |

Deprecated → Better

| Deprecated | Better | Since | |------------|--------|-------| | lazy_static! | std::sync::OnceLock | 1.70 | | once_cell::Lazy | std::sync::LazyLock | 1.80 | | std::sync::mpsc | crossbeam::channel | - | | std::sync::Mutex | parking_lot::Mutex | - | | failure/error-chain | thiserror/anyhow | - | | try!() | ? operator | 2018 |

Quick Reference

Naming: snake_case (fn/var), CamelCase (type), SCREAMING_CASE (const)
Format: rustfmt (just use it)
Docs: /// for public items, //! for module docs
Lint: #![warn(clippy::all)]

Claude knows Rust conventions well. These are the non-obvious Rust-specific rules.

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