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Idiomatic Rust patterns, ownership, error handling, traits, concurrency, and best practices for building safe, performant applications.
Passed 22 of 22 test cases with the skill, and 21 of 22 without it.
1 fixed21 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
A test case the skill fixed. Same model, same prompt, with and without the skill.
I wrote a Rust function that loads user preferences from a JSON string, but I'm relying on multiple unwrap calls and manual loops with cloning. Could you review this snippet and provide a refactored version following standard Rust best practices for clean ownership, iterator usage, and robust error propagation?
| Checked | Without skill | With skill |
|---|---|---|
| The refactored code replaces unwrap calls with error propagation using the question mark operator. | Passed | Passed |
| The refactored code uses an iterator pipeline rather than a manual loop with explicit cloning. | Missed | Passed |
The instructions your model reads when the skill loads.
Idiomatic Rust patterns and best practices for building safe, performant, and maintainable applications.
This skill enforces idiomatic Rust conventions across six key areas: ownership and borrowing to prevent data races at compile time, Result/? error propagation with thiserror for libraries and anyhow for applications, enums and exhaustive pattern matching to make illegal states unrepresentable, traits and generics for zero-cost abstraction, safe concurrency via Arc<Mutex<T>>, channels, and async/await, and minimal pub surfaces organized by domain.
Rust's ownership system prevents data races and memory bugs at compile time.
// Good: Pass references when you don't need ownership
fn process(data: &[u8]) -> usize {
data.len()
}
// Good: Take ownership only when you need to store or consume
fn store(data: Vec<u8>) -> Record {
Record { payload: data }
}
// Bad: Cloning unnecessarily to avoid borrow checker
fn process_bad(data: &Vec<u8>) -> usize {
let cloned = data.clone(); // Wasteful — just borrow
cloned.len()
}
Cow for Flexible Ownershiptest cases passed, vs 21 / 22 without
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