# Unreleased
# 0.4.2 - 2019-09-29
* [Fixed support for DSTs(Dynamically Sized Types).][113]
[113]: https://github.com/taiki-e/pin-project/pull/113
# 0.4.1 - 2019-09-26
* [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
* [**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<T> PinnedDrop for Foo<'_, T> {
fn drop(mut self: Pin<&mut Self>) {
**self.project().was_dropped = true;
}
}
```
* Added some examples and generated code.
* Improve error messages.
[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]
* Improved documentation.
[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 [taiki-e/pin-project#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 [taiki-e/pin-project#62][62] for more details.
* [Improved error messages][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
* [Applied `#[allow(dead_code)]` to 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
* Avoided 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
* Improved error messages.
# 0.3.3 - 2019-07-15 (yanked)
* Improved error messages.
# 0.3.2 - 2019-03-30
* Avoided suffixes on tuple index.
# 0.3.1 - 2019-03-02
* Improved documentation.
* 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.
* Improved documentation.
# 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
* Improved documentation.
# 0.1.1 - 2019-01-08
* Renamed from `unsafe_pin_project` to `unsafe_project`.
# 0.1.0 - 2019-01-08
Initial release