Added

• Introduce a new experimental attribute builder(generics(setters)) for overwriting generic types on the builder. (#364, #368, #370). Thanks @dflemstr for the contribution!
• Support builder(overwritable) with builder(getter) (#369)

Internal

• Regular maintenance (#365)

Fixed

• Don't attempt to compile big default value showcases as ignored rust doctests (#360)

Internal

• Regular maintenance (#361, #354, #363)

Fixed

• Fix clippy::wrong_self_convention warning for fields with is_ prefix etc. (#349). Thanks @nicmue for the contribution!

Internal

• Add a regression test for clippy::wrong_self_convention (#350)

Lint Update Notice

This release brings some rustdoc improvements and no other visible API changes except that rustc and clippy will start reporting some more true-positive lints. For example builder methods defined via an impl block annotated with #[bon] will now be correctly reported as unused if they are not used. Also, using a private type in a public builder method will trigger a private_interfaces lint now.

This is all thanks to the updated span handling design researched and implemented by @Eisverygoodletter. It's not clear what other new lints the new span handling may trigger in other realworld codebases. If you see a lint from the code generated by bon that you think shouldn't be there, please, open an issue, and it'll be fixed as soon as possible!

Changed

• Make rustdoc source links for the starting function reference original function (#341). Thanks @Eisverygoodletter for the contribution!
• Make rustdoc source links for setters/getters reference original member (#345)

Internal

• Regular maintenance (#342, #343, #347)

Fixed

• Add missing lifetime replacement for generic param declarations on derive(IntoFuture) impl block (#337)
• Set the lower bound requirement of rustversion to v1.0.19 (#336). Thanks @Fokko for the contribution!

This is a small patch release to make bon easier to package for Debian.

Other

• Add Copyright header to the MIT License (#331)

Internal

• Fix MSRV tests and lints from nightly 13-08-2025 (#329)
• Revert refactoring PR 320 to make code compatible with darling 0.20 (#332)

Added

• Add support for #[builder(derive(IntoFuture(Box)))] (#322).
  This allows calling builder.await instead of builder.call().await. Thanks @jakubadamw for the contribution!

Fixed

• Add missing where clause forwarding to #[builder(derive(Into))] (#325)

Internal

• Make tests pass without the experimental-overwritable feature (#326)
• Sunset financial support by Kindness (#324)
• Fix clippy lints from nightly (2025-08-09) (#323)

This is a regular maintenance release with no essential API/behavior changes. Enjoy the stability 😄.

Docs

• Add all 3 variations of builder syntax to the Basics guide pages (#315)

Internal

• Update the dependency darling (crate for parsing the attributes) from 0.20 to 0.21 and other internal dependencies (#317, #320, #304)
• Switch from iai to iai-callgrind for high-precision benchmarking of bon (#311). iai-callgrind is a better maintained alternative to iai, but in any case, both deserve a huge thanks for providing the benchmarking capabilities for bon!
• Migrate to OIDC for trusted publishing. Huge thanks for this new crates.io feature to everyone who made it happen! (#318)
• Fix clippy::or_fun_call lint from the nightly toolchain (#316)

Added

• Improve error reporting when using the #[bon::builder] fully qualified attribute inside of impl blocks (#297)

Fixed

• Fix missing support for #[builder(field)] with #[builder(const)] (#291)