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Changelog

All notable changes to this skill are documented here. The format is based on Keep a Changelog, and the project aims to follow semantic versioning for the rule set.

[1.5.1]

Changed

  • Depth pass: expanded own-rc-single-thread (breaking cycles with Weak, the Rc::clone idiom, strong_count/weak_count, !Send/!Sync) and own-refcell-interior (Cell for Copy types).
  • Added cross-references from ~18 foundational rules to the newer categories (conc-, conv-, num-, serde-, trait-, closure-, coll-, pat-) for better navigation between related rules.

1.5.0

Added

  • Const & Compile-Time category (const-, 4 rules): const fn, const vs static, const generics, inline const { } blocks.
  • Trait & Generics Design category (trait-, 6 rules): static vs dynamic dispatch, associated types vs generic params, default methods, blanket impls, object safety, the orphan rule + newtype.
  • Collections category (coll-, 4 rules): map choice (HashMap/BTreeMap/ IndexMap), sequence choice (Vec/VecDeque), set membership, BinaryHeap.
  • checks/gen_index.py — generates SKILL.md's priority table and Quick Reference (and the rule counts) from rules/ so the index can't drift; CI runs it in --check mode.
  • CONTRIBUTING.md and this CHANGELOG.md.

Now 265 rules across 26 categories.

1.4.0

Added

  • Closures category (closure-, 5 rules): Fn/FnMut/FnOnce bounds, returning impl Fn, move capture, static vs dynamic dispatch, disjoint capture.

Now 251 rules across 23 categories.

1.3.0

Added

  • Serde category (serde-, 8 rules): rename_all, default, skip, flatten, enum representation, deny_unknown_fields, custom (de)serialize, validate-on- deserialize.
  • Numeric & Arithmetic Safety category (num-, 5 rules): explicit overflow handling, as vs TryFrom, float comparison, clamping, NonZero.

Now 246 rules across 22 categories.

1.2.0

Added

  • Macros category (macro-, 8 rules): declarative-macro hygiene and fragment specifiers, and procedural-macro design with syn/quote.
  • Observability category (obs-, 7 rules): tracing, spans, structured fields, error chains, and keeping secrets out of logs.

Now 233 rules across 20 categories.

1.1.x

Added

  • Unsafe Code (unsafe-), Concurrency (conc-), Conversions (conv-), and Pattern Matching (pat-) categories, plus new rules across existing categories — 39 rules in total.
  • A compile-check harness (checks/) and a GitHub Actions CI workflow that validates rule structure, links, the index, and that examples compile.

Changed

  • Updated throughout for the Rust 2024 edition and current stable (Rust 1.96): fixed &mut T is not Copy, impl Trait in traits, collect_into status, resolver = "3", env::set_var now unsafe, and more.

Now 218 rules across 18 categories.

1.0.0

Added

  • Initial release: 179 rules across 14 categories.