# Changelog All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](https://semver.org). ## [Unreleased] ## [1.0.3] - 2021-01-05 - Exclude unneeded files from crates.io. ## [1.0.2] - 2020-11-18 - [Suppress `clippy::unknown_clippy_lints` lint in generated code.](https://github.com/taiki-e/pin-project/pull/303) ## [1.0.1] - 2020-10-15 - [Fix warnings when `#[pin_project]` attribute used within `macro_rules!` macros.](https://github.com/taiki-e/pin-project/pull/298) ## [1.0.0] - 2020-10-13 - [Remove deprecated `#[project]`, `#[project_ref]`, and `#[project_replace]` attributes.](https://github.com/taiki-e/pin-project/pull/265) Name the projected type by passing an argument with the same name as the method to the `#[pin_project]` attribute instead: ```diff - #[pin_project] + #[pin_project(project = EnumProj)] enum Enum { Variant(#[pin] T), } - #[project] fn func(x: Pin<&mut Enum>) { - #[project] match x.project() { - Enum::Variant(_) => { /* ... */ } + EnumProj::Variant(_) => { /* ... */ } } } ``` - [Remove deprecated `Replace` argument from `#[pin_project]` attribute.](https://github.com/taiki-e/pin-project/pull/266) Use `project_replace` argument instead. - [Optimize code generation when used on enums.](https://github.com/taiki-e/pin-project/pull/270) - [Raise the minimum supported Rust version of this crate from Rust 1.34 to Rust 1.37.](https://github.com/taiki-e/pin-project/pull/292) - Suppress `explicit_outlives_requirements`, `box_pointers`, `clippy::large_enum_variant`, `clippy::pattern_type_mismatch`, `clippy::implicit_return`, and `clippy::redundant_pub_crate` lints in generated code. ([#276](https://github.com/taiki-e/pin-project/pull/276), [#277](https://github.com/taiki-e/pin-project/pull/277), [#284](https://github.com/taiki-e/pin-project/pull/284)) - Diagnostic improvements. Changes since the 1.0.0-alpha.1 release: - [Fix drop order of pinned fields in project_replace](https://github.com/taiki-e/pin-project/pull/287) - Update minimal version of `syn` to 1.0.44 ## [1.0.0-alpha.1] - 2020-09-22 - [Remove deprecated `#[project]`, `#[project_ref]`, and `#[project_replace]` attributes.](https://github.com/taiki-e/pin-project/pull/265) Name the projected type by passing an argument with the same name as the method to the `#[pin_project]` attribute instead: ```diff - #[pin_project] + #[pin_project(project = EnumProj)] enum Enum { Variant(#[pin] T), } - #[project] fn func(x: Pin<&mut Enum>) { - #[project] match x.project() { - Enum::Variant(_) => { /* ... */ } + EnumProj::Variant(_) => { /* ... */ } } } ``` - [Remove deprecated `Replace` argument from `#[pin_project]` attribute.](https://github.com/taiki-e/pin-project/pull/266) Use `project_replace` argument instead. - [Optimize code generation when used on enums.](https://github.com/taiki-e/pin-project/pull/270) - Suppress `explicit_outlives_requirements`, `box_pointers`, `clippy::large_enum_variant`, `clippy::pattern_type_mismatch`, and `clippy::implicit_return` lints in generated code. ([#276](https://github.com/taiki-e/pin-project/pull/276), [#277](https://github.com/taiki-e/pin-project/pull/277)) - Diagnostic improvements. See also [tracking issue for 1.0 release](https://github.com/taiki-e/pin-project/issues/264). ## [0.4.27] - 2020-10-11 - Update minimal version of `syn` to 1.0.44 ## [0.4.26] - 2020-10-04 - [Fix drop order of pinned fields in project_replace](https://github.com/taiki-e/pin-project/pull/287) ## [0.4.25] - 2020-10-01 - Suppress `drop_bounds` lint, which will be added to rustc in the future. See [#272](https://github.com/taiki-e/pin-project/issues/272) for more details. (Note: 1.0.0-alpha.1 already contains this change.) ## [0.4.24] - 2020-09-26 - Fix compatibility of generated code with `forbid(future_incompatible)` Note: This does not guarantee compatibility with `forbid(future_incompatible)` in the future. If rustc adds a new lint, we may not be able to keep this. ## [0.4.23] - 2020-07-27 - [Fix compile error with `?Sized` type parameters.][263] [263]: https://github.com/taiki-e/pin-project/pull/263 ## [0.4.22] - 2020-06-14 - Documentation improvements. ## [0.4.21] - 2020-06-13 - [Deprecated `#[project]`, `#[project_ref]`, and `#[project_replace]` attributes due to some unfixable limitations.][244] Consider naming the projected type by passing an argument with the same name as the method to the `#[pin_project]` attribute instead. ```rust #[pin_project(project = EnumProj)] enum Enum { Variant(#[pin] T), } fn func(x: Pin<&mut Enum>) { match x.project() { EnumProj::Variant(y) => { let _: Pin<&mut T> = y; } } } ``` See [#225][225] for more details. - [Support `Self` in fields and generics in type definitions.][245] - [Fix errors involving *"`self` value is a keyword only available in methods with `self` parameter"* in apparently correct code.][250] - Diagnostic improvements. [225]: https://github.com/taiki-e/pin-project/pull/225 [244]: https://github.com/taiki-e/pin-project/pull/244 [245]: https://github.com/taiki-e/pin-project/pull/245 [250]: https://github.com/taiki-e/pin-project/pull/250 ## [0.4.20] - 2020-06-07 - [You can now use project_replace argument without Replace argument.][243] This used to require you to specify both. ```diff - #[pin_project(Replace, project_replace = EnumProjOwn)] + #[pin_project(project_replace = EnumProjOwn)] enum Enum { Variant(#[pin] T) } ``` - [Makes `project_replace` argument an alias for `Replace` argument so that it can be used without a value.][243] ```rust #[pin_project(project_replace)] enum Enum { Variant(#[pin] T) } ``` *The `Replace` argument will be deprecated in the future.* - Suppress `unreachable_pub` lint in generated code. [243]: https://github.com/taiki-e/pin-project/pull/243 ## [0.4.19] - 2020-06-04 - [Fix `unused_results` lint in generated code.][239] [239]: https://github.com/taiki-e/pin-project/pull/239 ## [0.4.18] - 2020-06-04 - [Support `Self` in more syntax positions inside `#[pinned_drop]` impl.][230] - [Suppress `clippy::type_repetition_in_bounds` and `clippy::used_underscore_binding` lints in generated code.][233] - Documentation improvements. - Diagnostic improvements. [230]: https://github.com/taiki-e/pin-project/pull/230 [233]: https://github.com/taiki-e/pin-project/pull/233 ## [0.4.17] - 2020-05-18 - [Support naming the projection types.][202] By passing an argument with the same name as the method to the attribute, you can name the projection type returned from the method: ```rust #[pin_project(project = EnumProj)] enum Enum { Variant(#[pin] T), } fn func(x: Pin<&mut Enum>) { match x.project() { EnumProj::Variant(y) => { let _: Pin<&mut T> = y; } } } ``` [202]: https://github.com/taiki-e/pin-project/pull/202 ## [0.4.16] - 2020-05-11 - [Fixed an issue that users can call internal function generated by `#[pinned_drop]`.][223] [223]: https://github.com/taiki-e/pin-project/pull/223 ## [0.4.15] - 2020-05-10 - [`#[project]` attribute can now handle all project\* attributes in that scope with one wrapper attribute.][220] [220]: https://github.com/taiki-e/pin-project/pull/220 ## [0.4.14] - 2020-05-09 - [Added `!Unpin` option to `#[pin_project]` attribute for guarantee the type is `!Unpin`.][219] ```rust #[pin_project(!Unpin)] struct Struct { field: T, } ``` This is equivalent to use `#[pin]` attribute for `PhantomPinned` field. ```rust #[pin_project] struct Struct { field: T, #[pin] // Note that using `PhantomPinned` without `#[pin]` attribute has no effect. _pin: PhantomPinned, } ``` *[Note: This raises the minimum supported Rust version of this crate from Rust 1.33 to Rust 1.34.](https://github.com/taiki-e/pin-project/pull/219#pullrequestreview-408644187)* - [Fixed an issue where duplicate `#[project]` attributes were ignored.][218] - [Suppress `single_use_lifetimes` lint in generated code.][217] - [Support overlapping lifetime names in HRTB.][217] - [Hide generated items from --document-private-items.][211] See [#211][211] for details. - Documentation improvements. [211]: https://github.com/taiki-e/pin-project/pull/211 [217]: https://github.com/taiki-e/pin-project/pull/217 [218]: https://github.com/taiki-e/pin-project/pull/218 [219]: https://github.com/taiki-e/pin-project/pull/219 ## [0.4.13] - 2020-05-07 - [Fixed a regression in 0.4.11.][207] Changes from [0.4.10](https://github.com/taiki-e/pin-project/releases/tag/v0.4.10) and [0.4.12](https://github.com/taiki-e/pin-project/releases/tag/v0.4.12): - [Fixed an issue that `#[project]` on non-statement expression does not work without unstable features.][197] - [Support overwriting the name of core crate.][199] - [Suppress `clippy::needless_pass_by_value` lint in generated code of `#[pinned_drop]`.][200] - Documentation improvements. - Diagnostic improvements. [207]: https://github.com/taiki-e/pin-project/pull/207 ## [0.4.12] - 2020-05-07 - A release to avoid [a regression in 0.4.11][206]. No code changes from [0.4.10](https://github.com/taiki-e/pin-project/releases/tag/v0.4.10). [206]: https://github.com/taiki-e/pin-project/issues/206 ## [0.4.11] - 2020-05-07 **Note: This release has been yanked.** See [#206][206] for details. - [Fixed an issue that `#[project]` on non-statement expression does not work without unstable features.][197] - [Support overwriting the name of core crate.][199] - [Suppress `clippy::needless_pass_by_value` lint in generated code of `#[pinned_drop]`.][200] - Documentation improvements. - Diagnostic improvements. [197]: https://github.com/taiki-e/pin-project/pull/197 [199]: https://github.com/taiki-e/pin-project/pull/199 [200]: https://github.com/taiki-e/pin-project/pull/200 ## [0.4.10] - 2020-05-04 - [Added `project_replace` method and `#[project_replace]` attribute.][194] `project_replace` method is optional and can be enabled by passing the `Replace` argument to `#[pin_project]` attribute. See [the documentation](https://docs.rs/pin-project/0.4/pin_project/attr.pin_project.html#project_replace) for more details. - [Support `Self` and `self` in more syntax positions inside `#[pinned_drop]` impl.][190] - [Hided all generated items except for projected types from calling code.][192] See [#192][192] for details. [190]: https://github.com/taiki-e/pin-project/pull/190 [192]: https://github.com/taiki-e/pin-project/pull/192 [194]: https://github.com/taiki-e/pin-project/pull/194 ## [0.4.9] - 2020-04-14 - [Fixed lifetime inference error when associated types are used in fields.][188] - [Fixed compile error with tuple structs with `where` clauses.][186] - [`#[project]` attribute can now be used for `if let` expressions.][181] [181]: https://github.com/taiki-e/pin-project/pull/181 [186]: https://github.com/taiki-e/pin-project/pull/186 [188]: https://github.com/taiki-e/pin-project/pull/188 ## [0.4.8] - 2020-01-27 - [Ensured that users cannot implement `PinnedDrop` without proper attribute argument.][180] - [Fixed use of `Self` in expression position inside `#[pinned_drop]` impl.][177] [177]: https://github.com/taiki-e/pin-project/pull/180 [180]: https://github.com/taiki-e/pin-project/pull/180 ## [0.4.7] - 2020-01-20 - [Fixed support for lifetime bounds.][176] [176]: https://github.com/taiki-e/pin-project/pull/176 ## [0.4.6] - 2019-11-20 - [Fixed compile error when there is `Self` in the where clause.][169] [169]: https://github.com/taiki-e/pin-project/pull/169 ## [0.4.5] - 2019-10-21 - [Fixed compile error with `dyn` types.][158] [158]: https://github.com/taiki-e/pin-project/pull/158 ## [0.4.4] - 2019-10-17 - [Fixed an issue where `PinnedDrop` implementations can call unsafe code without an unsafe block.][149] [149]: https://github.com/taiki-e/pin-project/pull/149 ## [0.4.3] - 2019-10-15 **Note: This release has been yanked.** See [#148] for details. - [`#[pin_project]` can now interoperate with `#[cfg_attr()]`.][135] - [`#[pin_project]` can now interoperate with `#[cfg()]` on tuple structs and tuple variants.][135] - [Fixed support for DSTs(Dynamically Sized Types) on `#[pin_project(UnsafeUnpin)]`][120] - Diagnostic improvements. [#148]: https://github.com/taiki-e/pin-project/pull/148 [120]: https://github.com/taiki-e/pin-project/pull/120 [135]: https://github.com/taiki-e/pin-project/pull/135 ## [0.4.2] - 2019-09-29 **Note: This release has been yanked.** See [#148] for details. - [Fixed support for DSTs(Dynamically Sized Types).][113] [113]: https://github.com/taiki-e/pin-project/pull/113 ## [0.4.1] - 2019-09-26 **Note: This release has been yanked.** See [#148] for details. - [Fixed an issue that caused an error when using `#[pin_project]` on a type that has `#[pin]` + `!Unpin` field with no generics or lifetime.][111] [111]: https://github.com/taiki-e/pin-project/pull/111 ## [0.4.0] - 2019-09-25 **Note: This release has been yanked.** See [#148] for details. - [**Pin projection has become a safe operation.**][18] In the absence of other unsafe code that you write, it is impossible to cause undefined behavior. - `#[unsafe_project]` attribute has been replaced with `#[pin_project]` attribute. ([#18][18], [#33][33]) - [The `Unpin` argument has been removed - an `Unpin` impl is now generated by default.][18] - Drop impls must be specified with `#[pinned_drop]` instead of via a normal `Drop` impl. ([#18][18], [#33][33], [#86][86]) - [`Unpin` impls must be specified with an impl of `UnsafeUnpin`, instead of implementing the normal `Unpin` trait.][18] - [`#[pin_project]` attribute now determines the visibility of the projection type/method is based on the original type.][96] - [`#[pin_project]` can now be used for public type with private field types.][53] - [`#[pin_project]` can now interoperate with `#[cfg()]`.][77] - [Added `project_ref` method to `#[pin_project]` types.][93] - [Added `#[project_ref]` attribute.][93] - [Removed "project_attr" feature and always enable `#[project]` attribute.][94] - [`#[project]` attribute can now be used for `impl` blocks.][46] - [`#[project]` attribute can now be used for `use` statements.][85] - [`#[project]` attribute now supports `match` expressions at the position of the initializer expression of `let` expressions.][51] Changes since the 0.4.0-beta.1 release: - [Fixed an issue that caused an error when using `#[pin_project(UnsafeUnpin)]` and not providing a manual `UnsafeUnpin` implementation on a type with no generics or lifetime.][107] [18]: https://github.com/taiki-e/pin-project/pull/18 [33]: https://github.com/taiki-e/pin-project/pull/107 [107]: https://github.com/taiki-e/pin-project/pull/107 ## [0.4.0-beta.1] - 2019-09-21 - [Changed the argument type of project method back to `self: Pin<&mut Self>`.][90] - [Removed "project_attr" feature and always enable `#[project]` attribute.][94] - [Removed "renamed" feature.][100] - [`#[project]` attribute can now be used for `use` statements.][85] - [Added `project_ref` method and `#[project_ref]` attribute.][93] - [`#[pin_project]` attribute now determines the visibility of the projection type/method is based on the original type.][96] [85]: https://github.com/taiki-e/pin-project/pull/85 [90]: https://github.com/taiki-e/pin-project/pull/90 [93]: https://github.com/taiki-e/pin-project/pull/93 [94]: https://github.com/taiki-e/pin-project/pull/94 [96]: https://github.com/taiki-e/pin-project/pull/96 [100]: https://github.com/taiki-e/pin-project/pull/100 ## [0.4.0-alpha.11] - 2019-09-11 - [Changed #[pinned_drop] to trait implementation.][86] ```rust #[pinned_drop] impl PinnedDrop for Foo<'_, T> { fn drop(mut self: Pin<&mut Self>) { **self.project().was_dropped = true; } } ``` - Added some examples and generated code. - Diagnostic improvements. [86]: https://github.com/taiki-e/pin-project/pull/86 ## [0.4.0-alpha.10] - 2019-09-07 - [`#[pin_project]` can now interoperate with `#[cfg()]`.][77] - Documentation improvements. [77]: https://github.com/taiki-e/pin-project/pull/77 ## [0.4.0-alpha.9] - 2019-09-05 - [Added 'project_into' method to `#[pin_project]` types][69]. This can be useful when returning a pin projection from a method. ```rust fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut T> { self.project_into().pinned } ``` - [Prevented UnpinStruct from appearing in the document by default.][71] See [#71][71] for more details. [69]: https://github.com/taiki-e/pin-project/pull/69 [71]: https://github.com/taiki-e/pin-project/pull/69 ## [0.4.0-alpha.8] - 2019-09-03 - [Improved document of generated code.][62]. Also added an option to control the document of generated code. See [#62][62] for more details. - [Diagnostic improvements.][61] [61]: https://github.com/taiki-e/pin-project/pull/61 [62]: https://github.com/taiki-e/pin-project/pull/62 ## [0.4.0-alpha.7] - 2019-09-02 - [Suppress `dead_code` lint in generated types.][57] [57]: https://github.com/taiki-e/pin-project/pull/57 ## [0.4.0-alpha.6] - 2019-09-01 - [Allowed using `#[pin_project]` type with private field types][53] [53]: https://github.com/taiki-e/pin-project/pull/53 ## [0.4.0-alpha.5] - 2019-08-24 - [`#[project]` attribute now supports `match` expressions at the position of the initializer expression of `let` expressions.][51] [51]: https://github.com/taiki-e/pin-project/pull/51 ## [0.4.0-alpha.4] - 2019-08-23 - Suppress `clippy::drop_bounds` lint in generated code. ## [0.4.0-alpha.3] - 2019-08-23 - [Changed `project` method generated by `#[pin_project]` attribute to take an `&mut Pin<&mut Self>` argument.][47] - [`#[project]` attribute can now be used for impl blocks.][46] - [`#[pin_project]` attribute can now detect that the type used does not have its own drop implementation without actually implementing drop.][48] This removed some restrictions. [46]: https://github.com/taiki-e/pin-project/pull/46 [47]: https://github.com/taiki-e/pin-project/pull/47 [48]: https://github.com/taiki-e/pin-project/pull/48 ## [0.4.0-alpha.2] - 2019-08-13 - Updated `proc-macro2`, `syn`, and `quote` to 1.0. ## [0.4.0-alpha.1] - 2019-08-11 - **Pin projection has become a safe operation.** - `#[unsafe_project]` has been replaced with `#[pin_project]`. - The `Unpin` argument has been removed - an `Unpin` impl is now generated by default. - Drop impls must be specified with `#[pinned_drop]` instead of via a normal `Drop` impl. - `Unpin` impls must be specified with an impl of `UnsafeUnpin`, instead of implementing the normal `Unpin` trait. - Made `#[project]` attribute disabled by default. See also [tracking issue for 0.4 release][21]. [21]: https://github.com/taiki-e/pin-project/issues/21 ## [0.3.5] - 2019-08-14 - Updated `proc-macro2`, `syn`, and `quote` to 1.0. ## [0.3.4] - 2019-07-21 - Diagnostic improvements. ## [0.3.3] - 2019-07-15 **Note: This release has been yanked.** See [#16] for details. - Diagnostic improvements. [#16]: https://github.com/taiki-e/pin-project/issues/16 ## [0.3.2] - 2019-03-30 - Avoided suffixes on tuple index. ## [0.3.1] - 2019-03-02 - Documentation improvements. - Updated minimum `syn` version to 0.15.22. ## [0.3.0] - 2019-02-20 - Removed `unsafe_fields` attribute. - Removed `unsafe_variants` attribute. ## [0.2.2] - 2019-02-20 - Fixed a bug that generates incorrect code for the some structures with trait bounds on type generics. ## [0.2.1] - 2019-02-20 - Fixed a bug that generates incorrect code for the structures with where clause and associated type fields. ## [0.2.0] - 2019-02-11 - Made `unsafe_fields` optional. - Documentation improvements. ## [0.1.8] - 2019-02-02 - Added the feature to create projected enums to `unsafe_project`. - Added `project` attribute to support pattern matching. ## [0.1.7] - 2019-01-19 - Fixed documentation. ## [0.1.6] - 2019-01-19 - `unsafe_fields` can now opt-out. - Added `unsafe_variants` attribute. This attribute is available if pin-project is built with the "unsafe_variants" feature. ## [0.1.5] - 2019-01-17 - Added support for tuple struct to `unsafe_project`. ## [0.1.4] - 2019-01-12 - Added options for automatically implementing `Unpin` to both `unsafe_project` and `unsafe_fields`. ## [0.1.3] - 2019-01-11 - Fixed dependencies. - Added `unsafe_fields` attribute. ## [0.1.2] - 2019-01-09 - Documentation improvements. ## [0.1.1] - 2019-01-08 - Renamed from `unsafe_pin_project` to `unsafe_project`. ## [0.1.0] - 2019-01-08 **Note: This release has been yanked.** Initial release [Unreleased]: https://github.com/taiki-e/pin-project/compare/v1.0.3...HEAD [1.0.3]: https://github.com/taiki-e/pin-project/compare/v1.0.2...v1.0.3 [1.0.2]: https://github.com/taiki-e/pin-project/compare/v1.0.1...v1.0.2 [1.0.1]: https://github.com/taiki-e/pin-project/compare/v1.0.0...v1.0.1 [1.0.0]: https://github.com/taiki-e/pin-project/compare/v1.0.0-alpha.1...v1.0.0 [1.0.0-alpha.1]: https://github.com/taiki-e/pin-project/compare/v0.4.23...v1.0.0-alpha.1 [0.4.27]: https://github.com/taiki-e/pin-project/compare/v0.4.26...v0.4.27 [0.4.26]: https://github.com/taiki-e/pin-project/compare/v0.4.25...v0.4.26 [0.4.25]: https://github.com/taiki-e/pin-project/compare/v0.4.24...v0.4.25 [0.4.24]: https://github.com/taiki-e/pin-project/compare/v0.4.23...v0.4.24 [0.4.23]: https://github.com/taiki-e/pin-project/compare/v0.4.22...v0.4.23 [0.4.22]: https://github.com/taiki-e/pin-project/compare/v0.4.21...v0.4.22 [0.4.21]: https://github.com/taiki-e/pin-project/compare/v0.4.20...v0.4.21 [0.4.20]: https://github.com/taiki-e/pin-project/compare/v0.4.19...v0.4.20 [0.4.19]: https://github.com/taiki-e/pin-project/compare/v0.4.18...v0.4.19 [0.4.18]: https://github.com/taiki-e/pin-project/compare/v0.4.17...v0.4.18 [0.4.17]: https://github.com/taiki-e/pin-project/compare/v0.4.16...v0.4.17 [0.4.16]: https://github.com/taiki-e/pin-project/compare/v0.4.15...v0.4.16 [0.4.15]: https://github.com/taiki-e/pin-project/compare/v0.4.14...v0.4.15 [0.4.14]: https://github.com/taiki-e/pin-project/compare/v0.4.13...v0.4.14 [0.4.13]: https://github.com/taiki-e/pin-project/compare/v0.4.11...v0.4.13 [0.4.12]: https://github.com/taiki-e/pin-project/compare/v0.4.10...v0.4.12 [0.4.11]: https://github.com/taiki-e/pin-project/compare/v0.4.10...v0.4.11 [0.4.10]: https://github.com/taiki-e/pin-project/compare/v0.4.9...v0.4.10 [0.4.9]: https://github.com/taiki-e/pin-project/compare/v0.4.8...v0.4.9 [0.4.8]: https://github.com/taiki-e/pin-project/compare/v0.4.7...v0.4.8 [0.4.7]: https://github.com/taiki-e/pin-project/compare/v0.4.6...v0.4.7 [0.4.6]: https://github.com/taiki-e/pin-project/compare/v0.4.5...v0.4.6 [0.4.5]: https://github.com/taiki-e/pin-project/compare/v0.4.4...v0.4.5 [0.4.4]: https://github.com/taiki-e/pin-project/compare/v0.4.3...v0.4.4 [0.4.3]: https://github.com/taiki-e/pin-project/compare/v0.4.2...v0.4.3 [0.4.2]: 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