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---
name: rust
description: Best practices for Rust development including ownership, error handling, and async patterns.
globs: ["**/*.rs", "**/Cargo.toml", "**/Cargo.lock"]
priority: 90
tags: ["language"]
---
# Rust Best Practices
## Ownership & Borrowing
- Prefer borrowing over ownership transfer
- Use &str for function parameters over String
- Clone only when necessary
- Use Cow<str> for maybe-owned strings
## Error Handling
- Use Result<T, E> for recoverable errors
- Use panic! only for unrecoverable errors
- Use ? operator for error propagation
- Create custom error types with thiserror
- Use anyhow for application errors
## Idioms
- Use iterators over manual loops
- Prefer pattern matching with match
- Use Option for optional values
- Use derive macros for common traits
- Use clippy for linting
## Performance
- Use release builds for benchmarks
- Profile before optimizing
- Consider using Box for large stack types
- Use Arc/Mutex for shared state
## Async
- Use tokio or async-std runtime
- Use async/await for async code
- Avoid blocking in async context
- Use channels for async communication
