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capnpc

Cap'n Proto code generation

0.27.0 10M downloads/mo #3115 most downloaded on crates.io capnproto/capnproto-rust

What this package is like to depend on

Last release 21 days ago

02 Aug 2026

Ships fairly regularly

a new release about every 2 months

Some releases are documented

notes for 78 of 148 stable releases

Nothing withdrawn

no release was ever pulled

12 years old

148 releases · first in 2014

14 releases in the last 12 months

see the full history below

Release timeline

148 releases · Nov 2014 to Aug 2026
2015 2017 2019 2021 2023 2025
Release Pre-release

Releases

latest 60 of 148
  1. 0.27.0 02 Aug 2026
    Release notes

    prepare for v0.27.0 release

    Open source →
    Release notes
    • Adjust generated code for updated base crate API.
    Open source →
  2. 0.26.0 17 Jun 2026
    Release notes
    • Adjust generated code for new RawEnumSchema constructor.
    Open source →
  3. 0.25.3 02 Apr 2026
    Release notes
    • Avoid unreachable_pub warnings in generated code.
    Open source →
  4. 0.25.2 30 Mar 2026
    Release notes
    • Use 4-space indents in generated code.
    • Prefer TryFrom over TryInto in generated code.
    Open source →
  5. 0.25.1 29 Mar 2026
    Release notes
    • Add version numbers in toplevel comment of generated code.
    Open source →
  6. 0.25.0 09 Jan 2026
    Release notes
    • Use new GeneratedCodeArena to avoid need for unsafe in generated code.
    Open source →
  7. 0.24.1 08 Jan 2026
    Release notes
    • Add local #[allow(unsafe_code)] annotations to generated code.
    Open source →
  8. 0.24.0 24 Dec 2025
    Release notes
    • Adjust generated code to use new constructors for constants and RawStructSchema.
    Open source →
  9. 0.23.3 24 Dec 2025
    Release notes
    • Adjust generated dispatch code to properly disambiguate when an 'extends' interface method conflicts with another method.
    Open source →
  10. 0.23.2 29 Oct 2025
    Release notes
    • Remove async block in generated code for streaming methods.
    Open source →
  11. 0.23.1 28 Oct 2025
    Release notes
    • Use f64::INFINITY instead of ::core::f64::INFINITY in generated code.
    Open source →
  12. 0.23.0 28 Oct 2025
    Release notes
    • Update generated code of Server trait methods to take self as Rc<Self>.
    Open source →
  13. 0.22.0 27 Oct 2025
    Release notes
    • Update generated code of Server traits to support async fn methods. What previously was a &mut self parameter is now &self. Therefore RPC objects must now add their own interior mutability as needed. Cell or RefCell should suffice in most cases.
    • Remove support for rustc editions older than 2021 (when await was added).
    Open source →
  14. 0.21.4 31 Aug 2025
    Release notes
    • Update minimum required version of capnp base crate, to account for new usage of impl Clone for capnp:: capability::Client.
    Open source →
  15. 0.21.3 28 Aug 2025
    Release notes
    • Fix code generation for non-finite float point constants.
    Open source →
  16. 0.21.2 22 Jul 2025
    Release notes
    • Use new capability::DynClientHook alias to avoid warnings in generated code.
    Open source →
  17. 0.21.1 02 Jul 2025
    Release notes
    • Use new introspect::panic_invalid_field_index() and introspect::panic_invalid_annotation_indices() functions so that generated code can pass Clippy while still working on Rust 2015.
    Open source →
  18. 0.21.0 08 Apr 2025
    Release notes
    • Follow v0.21.0 release of other capnp crates.
    Open source →
  19. 0.20.1 15 Nov 2024
    Release notes
    • Elide more lifetimes in generated code to make Clippy happy.
    Open source →
  20. 0.20.0 17 Sep 2024
    Release notes
    • Add support for stream keyword.
    Open source →
  21. 0.19.0 14 Jan 2024
    Release notes
    • Include new members_by_name field of RawStructSchema.
    • Generalize text, primitive_list, and enum_list setters using impl SetterInput.
    Open source →
  22. 0.18.1 11 Jan 2024
    Release notes
    • Fix overly-restrictive lifetimes in setters of certain list fields.
    Open source →
  23. 0.18.0 04 Sep 2023
    Release notes
    • Update for lazier utf-8 validation.
    Open source →
  24. 0.17.2 26 Jun 2023
    Release notes
    • Add the $Rust.option annotation for declaring fields to be optional.
    • Add CompilerCommand::crate_provides(), allowing cross-crate imports.
    Open source →
  25. 0.17.1 12 May 2023
    Release notes
    • Fix setters of enum fields with defaults.
    Open source →
  26. 0.17.0 08 May 2023
    Release notes
    • Add support for reflection.
    • Implement Debug for all generated struct Reader types.
    Open source →
  27. 0.16.5 02 May 2023
    Release notes
    • Use core::marker instead of std::marker for pointer constants, for no_std compat.
    Open source →
  28. 0.16.4 20 Apr 2023
    Release notes
    • Generate explicit Clone and Copy impls for Reader structs.
    • Fully-qualify ::capnp::Word in generated code.
    • Add capnp --version invocation before capnp compile, for better error reporting.
    • Clear PWD env variable, to silence warning from kj/filesystem-disk-unix.c++.
    Open source →
  29. 0.16.3 27 Feb 2023
    Release notes
    • Generate *_has() methods for capability fields.
    Open source →
  30. 0.16.2 30 Jan 2023
    Release notes
    • Avoid ambiguous associated item in TryFrom implementations.
    Open source →
  31. 0.16.1 17 Jan 2023
    Release notes
    • Fix clippy warnings in generated code.
    Open source →
  32. 0.16.0 17 Jan 2023
    Release notes
    • Update code generation for removal of To16, FromU16, FromStructReader, FromStructBuilder.
    Open source →
  33. 0.15.2 12 Dec 2022
    Release notes
    • Apply clippy lifetime elision suggestion in set_pointer_builder() in generated code.
    Open source →
  34. 0.15.1 05 Dec 2022
    Release notes
    • Lots of style fixes and linting, including for generated code.
    Open source →
  35. 0.15.0 03 Nov 2022
    Release notes
    • Support trait changes in capnp::traits.
    • Remove deprecated function.
    Open source →
  36. 0.14.9 13 Jul 2022
    Release notes
    • Fix Clippy warnings in generated code.
    Open source →
  37. 0.14.8 12 Jul 2022
    Release notes
    • Include name of method in unimplemented error messages.
    • Fix super interface lookup in case of transitive extends chain.
    Open source →
  38. 0.14.7 24 Feb 2022
    Release notes
    • Canonicalize order of type parameters from the bugfix for issue 260.
    Open source →
  39. 0.14.6 24 Feb 2022
    Release notes
    • Fix bug in code generation for unions that don't use all of their enclosing struct's generic params.
    Open source →
  40. 0.14.5 08 Jan 2022
    Release notes
    • Fix bug in code generation for generic groups.
    • Add CompilerCommand.raw_code_generator_request_path().
    Open source →
  41. 0.14.4 11 Jun 2021
    Release notes
    • Check that schema files exist before attempting to invoke the schema compiler.
    Open source →
  42. 0.14.3 09 Apr 2021
    Release notes
    • Include LICENSE in published crate.
    Open source →
  43. 0.14.2 30 Dec 2020
    Release notes
    • Add CompilerCommand::default_parent_module() option.
    • Add codegen::CodeGenerationCommand and deprecate codegen::generate_code().
    Open source →
  44. 0.14.1 22 Dec 2020
    Release notes
    • Get generated code to pass the elided_lifetimes_in_paths lint.
    Open source →
  45. 0.14.0 19 Dec 2020
    Release notes
    • Update for SetPointerBuilder no longer having a To type parameter.
    • Make generated Owned structs unconstructable. They are only intented to be used as types, not values.
    Open source →
  46. 0.13.1 07 Jul 2020
    Release notes
    • Fix some more clippy warnings in generated code.
    Open source →
  47. 0.13.0 06 Jun 2020
    Release notes
    • Update to work without requiring "std" feature of capnp base crate.
    • Refer to core instead of std in generated code.
    • Remove deprecated ToClient structs from generated code.
    Open source →
  48. 0.12.4 23 May 2020
    Release notes
    • Add CompilerCommand.capnp_executable().
    • Remove obsolete RustEdition enum.
    Open source →
  49. 0.12.3 02 May 2020
    Release notes
    • Generate code for new capnp::capability::FromServer trait.
    Open source →
  50. 0.12.2 26 Apr 2020
    Release notes
    • Add parentModule annotation to allow generated code to be included in a submodule.
    Open source →
  51. 0.12.1 13 Feb 2020
    Release notes
    • Add rust.capnp file with name annotation for renaming items in generated Rust code.
    Open source →
  52. 0.12.0 19 Jan 2020
    Release notes
    • Remove deprecated item.
    Open source →
  53. 0.11.1 21 Dec 2019
    Release notes
    • Avoid generating some superfluous parentheses.
    Open source →
  54. 0.11.0 07 Dec 2019
    Release notes
    • Remove unused experimental schema module.
    • Bump minimum supported rustc version to 1.39.0.
    Open source →
  55. 0.10.2 19 Nov 2019
    Release notes
    • Include the string "@generated" generated code.
    • Don't write output files if their content is unchanged.
    Open source →
  56. 0.10.1 04 Jul 2019
    Release notes
    • Allow CompilerCommand to work even when OUT_DIR is not set.
    Open source →
  57. 0.10.0 16 Jun 2019
    Release notes
    • Simplify handling of pointer defaults.
    • Use new const fn ::capnp::word() instead of capnp_word!() macro.
    • Remove deprecated items.
    • Use dyn keyword for trait objects.
    • Deprecate edition() configuration. Apparently the code we generate for Rust 2018 also works for Rust 2015 now.
    • Update to 2018 edition.
    • Update minimum required rustc version to 1.35.
    Open source →
  58. 0.9.5 24 Apr 2019
    Release notes
    • Fix bug in code generation for generic interfaces.
    Open source →
  59. 0.9.4 20 Apr 2019
    Release notes
    • Add support for pointer field defaults.
    Open source →
  60. 0.9.3 02 Dec 2018
    Release notes
    • Generate impls of new IntoInternalStructReader trait, to support set_with_caveats.
    • Update deprecation attributes, to satisfy clippy.
    Open source →

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