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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This project adheres to [Semantic Versioning](https://semver.org).
+
+## [Unreleased]
+
+## [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]
+
+[188]: https://github.com/taiki-e/pin-project/pull/188
+[186]: https://github.com/taiki-e/pin-project/pull/186
+[181]: https://github.com/taiki-e/pin-project/pull/181
+
+## [0.4.8] - 2020-01-27
+
+* [Ensured that users cannot implement `PinnedDrop` without proper attribute argument.][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 - YANKED
+
+* [`#[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]
+
+[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 - YANKED
+
+* [Fixed support for DSTs(Dynamically Sized Types).][113]
+
+[113]: https://github.com/taiki-e/pin-project/pull/113
+
+## [0.4.1] - 2019-09-26 - YANKED
+
+* [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 - YANKED
+
+* [**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 - YANKED
+
+Initial release
+
+[Unreleased]: https://github.com/taiki-e/pin-project/compare/v0.4.9...HEAD
+[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]: https://github.com/taiki-e/pin-project/compare/v0.4.1...v0.4.2
+[0.4.1]: https://github.com/taiki-e/pin-project/compare/v0.4.0...v0.4.1
+[0.4.0]: https://github.com/taiki-e/pin-project/compare/v0.4.0-beta.1...v0.4.0
+[0.4.0-beta.1]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.11...v0.4.0-beta.1
+[0.4.0-alpha.11]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.10...v0.4.0-alpha.11
+[0.4.0-alpha.10]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.9...v0.4.0-alpha.10
+[0.4.0-alpha.9]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.8...v0.4.0-alpha.9
+[0.4.0-alpha.8]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.7...v0.4.0-alpha.8
+[0.4.0-alpha.7]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.6...v0.4.0-alpha.7
+[0.4.0-alpha.6]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.5...v0.4.0-alpha.6
+[0.4.0-alpha.5]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.4...v0.4.0-alpha.5
+[0.4.0-alpha.4]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.3...v0.4.0-alpha.4
+[0.4.0-alpha.3]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.2...v0.4.0-alpha.3
+[0.4.0-alpha.2]: https://github.com/taiki-e/pin-project/compare/v0.4.0-alpha.1...v0.4.0-alpha.2
+[0.4.0-alpha.1]: https://github.com/taiki-e/pin-project/compare/v0.3.5...v0.4.0-alpha.1
+[0.3.5]: https://github.com/taiki-e/pin-project/compare/v0.3.4...v0.3.5
+[0.3.4]: https://github.com/taiki-e/pin-project/compare/v0.3.3...v0.3.4
+[0.3.3]: https://github.com/taiki-e/pin-project/compare/v0.3.2...v0.3.3
+[0.3.2]: https://github.com/taiki-e/pin-project/compare/v0.3.1...v0.3.2
+[0.3.1]: https://github.com/taiki-e/pin-project/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/taiki-e/pin-project/compare/v0.2.2...v0.3.0
+[0.2.2]: https://github.com/taiki-e/pin-project/compare/v0.2.1...v0.2.2
+[0.2.1]: https://github.com/taiki-e/pin-project/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/taiki-e/pin-project/compare/v0.1.8...v0.2.0
+[0.1.8]: https://github.com/taiki-e/pin-project/compare/v0.1.7...v0.1.8
+[0.1.7]: https://github.com/taiki-e/pin-project/compare/v0.1.6...v0.1.7
+[0.1.6]: https://github.com/taiki-e/pin-project/compare/v0.1.5...v0.1.6
+[0.1.5]: https://github.com/taiki-e/pin-project/compare/v0.1.4...v0.1.5
+[0.1.4]: https://github.com/taiki-e/pin-project/compare/v0.1.3...v0.1.4
+[0.1.3]: https://github.com/taiki-e/pin-project/compare/v0.1.2...v0.1.3
+[0.1.2]: https://github.com/taiki-e/pin-project/compare/v0.1.1...v0.1.2
+[0.1.1]: https://github.com/taiki-e/pin-project/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/taiki-e/pin-project/releases/tag/v0.1.0