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Rust Refactoring Guide guidance for Fortress Rollback. Use when Refactoring code, planning safe transformations, verification after changes.
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| name | refactoring |
| description | Rust Refactoring Guide guidance for Fortress Rollback. Use when Refactoring code, planning safe transformations, verification after changes. |
| Signal | Action |
|---|---|
unwrap()/expect() in production | Convert to Result propagation |
.clone() without clear need | Analyze ownership, use references |
| Manual loops with indexing | Convert to iterators |
| Primitive types for domain concepts | Wrap in newtypes |
Vec<T> where &[T] suffices | Accept slices at boundaries |
| Large enum variants | Box the large variants |
# Pre-refactoring
cargo nextest run && cargo clippy --workspace --all-targets --features tokio,json
# After each change
cargo check && cargo nextest run
# Post-refactoring
cargo fmt && cargo clippy --workspace --all-targets --features tokio,json && cargo nextest run
rg "unwrap\(\)|expect\(|panic!\(|todo!\(" src/
| # | Pattern | From | To | Clippy Lint |
|---|---|---|---|---|
| 1 | Clone to Reference | fn(x: String) | fn(x: &str) | needless_pass_by_value |
| 2 | Unnecessary to_string() | name.to_string() for lookup | Direct &str | unnecessary_to_owned |
| 3 | Pre-allocate Collections | Vec::new() + push loop | Vec::with_capacity(n) | -- |
| 4 | Reuse Collections in Loops | New buffer each iteration | .clear() + reuse | -- |
| 5 | clone_from | x = y.clone() | x.clone_from(&y) | -- |
| 6 | Index Loop to Iterator | for i in 0..len | .iter() chain | -- |
| 7 | Avoid Intermediate collect() | -> Vec<T> | -> impl Iterator | -- |
| 8 | chunks_exact | .chunks(n) | .chunks_exact(n) | -- |
| 9 | iter().copied() | .iter().map(|&b| b) | .iter().copied() | -- |
| 10 | swap_remove | .remove(i) unordered | .swap_remove(i) | -- |
| 11 | unwrap() to ? | .unwrap() | .ok_or(err)? | unwrap_used |
| 12 | expect() to Error | .expect(msg) | .map_err(|e| Err)? | expect_used |
| 13 | Index to get() | collection[i] | .get(i)? | indexing_slicing |
| 14 | Silent Swallow to Explicit | let _ = result | Propagate or handle | -- |
| 15 | unwrap_or to unwrap_or_else | unwrap_or(expensive()) | unwrap_or_else(|| ...) | or_fun_call |
| 16 | &String/&Vec to slice | fn(v: &Vec<T>) | fn(v: &[T]) | ptr_arg |
| 17 | Return Borrowed to Owned | Complex lifetime returns | Cow<'_, str> | -- |
| 18 | mem::take | Clone + clear | mem::take(&mut x) | -- |
| 19 | Struct Decomposition | &mut self conflicts | Direct field access / parts_mut() | -- |
| 20 | Cow for Conditional Ownership | Always clone | Cow::Borrowed/Cow::Owned | -- |
| 21 | Primitive to Newtype | fn(from: u64, to: u64) | Type-safe wrappers | -- |
| 22 | Bool to Enum | fn(secure: bool) | Security::Secure | -- |
| 23 | Option Fields to Types | email: Option<String> | VerifiedUser { email: String } | -- |
| 24 | String Status to Enum | status: String | TaskStatus::Complete | -- |
| 25 | Checked Arithmetic | center - radius | center.checked_sub(radius)? | arithmetic_side_effects |
Vec<T> to impl Iterator is breakingmem::take with invalid Default -- use mem::replace with valid replacement#[non_exhaustive] on error enumscargo nextest runcargo clippy --workspace --all-targets --features tokio,jsonCrate Publishing guidance for Fortress Rollback. Use when Publishing to crates.io, version bumps, release checklist.
Changelog Practices guidance for Fortress Rollback. Use when Writing CHANGELOG entries, deciding what to document.
Design Decision Log Pattern guidance for Fortress Rollback. Use when Architectural decisions, design alternatives, superseding prior choices.
Repository-wide engineering policy and project context for Fortress Rollback. Use when implementing, diagnosing, reviewing, testing, documenting, or releasing changes in this repository.
GitHub Actions Best Practices guidance for Fortress Rollback. Use when Writing GitHub Actions workflows, CI debugging, actionlint, caching.
Workspace Organization guidance for Fortress Rollback. Use when Organizing workspace, splitting crates, module structure decisions.