v0.28.0

What's Changed

New lints, new functionality, UX improvements, and an awesome new logo courtesy of NUMI!

Performance
Now running lints in parallel using rayon (#625), for a ~3-4x speedup in lint execution time (i.e. not counting rustdoc generation and parsing time, which still dominate).

• In my measurements, the wall-clock time gains here are on the order of 12s (16s -> 4s) on the biggest crate I know of (aws-sdk-ec2, 240k+ items), and ~1s on most crates of more reasonable size.
• Also added a better breakdown of where time is actually spent, between generating rustdoc, parsing the JSON, and running lints: #630
• The parallelization and the time breakdown improvements were both contributed by @jw013 🎉

New lints

• enum_repr_transparent_removed, contributed by @fprasx in #627
• Ability to write lints for union types, also contributed by @fprasx: obi1kenobi/trustfall-rustdoc-adapter#309
  • This immediately enables writing at least a half dozen new lints, for which I'm happy to mentor contributors: #633

New functionality
Support for custom build.target cargo configurations, contributed by @Nemo157: #619

It also supports setting an explicit cargo build target via our new --build-target CLI flag.

Bugfixes
Bugfix for an unusual situation where having RUSTFLAGS="-Dwarnings" would prevent rustdoc JSON from being built in case a dependency of the crate we're checking had warnings.

This would sometimes happen with the actions-rust-lang/setup-rust-toolchain GitHub Action, which sets RUSTFLAGS="-Dwarnings" by default.

All Merged PRs

• Add table of contents to FAQ and add a few more questions and answers. by @obi1kenobi in #618
• Add Rust 1.74 to the test matrix. by @obi1kenobi in #623
• Add test crate to test async fn and impl Future by @jw013 in #622
• update repr-related reference links by @fprasx in #626
• implement enum_repr_transparent_removed lint by @fprasx in #627
• Add timing output for rustdoc and crate total by @jw013 in #630
• Parallel lints by @jw013 in #625
• cargo update to enable querying Union types' information. by @obi1kenobi in #631
• Weekly cargo update of dependencies by @obi1kenobi in #636
• New Logo by @agreea in #628
• Add separate issue templates for false-positive and false-negatives. by @obi1kenobi in #639
• Mention our lint wishlist issue in the false-negative issue template. by @obi1kenobi in #640
• Update schema link in CONTRIBUTING.md by @obi1kenobi in #641
• Weekly cargo update of dependencies by @obi1kenobi in #642
• Detect when build.target is configured, and allow overriding it from the command line by @Nemo157 in #619
• Fix occasional failure to generate rustdoc when RUSTFLAGS="-Dwarnings". by @obi1kenobi in #643
• Manually update dependencies before publishing new release. by @obi1kenobi in #644
• Release v0.28.0. by @obi1kenobi in #645

New Contributors

• @fprasx made their first contribution in #626
• @agreea made their first contribution in #628
• @Nemo157 made their first contribution in #619

Full Changelog: v0.27.0...v0.28.0