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# Changelog
All notable changes to this project will be documented in this file.
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## [Unreleased]
## [1.1.0] - 2023-05-13
- Update `syn` dependency to 2. This increase the minimum supported Rust version from Rust 1.37 to Rust 1.56. ([#352](https://github.com/taiki-e/pin-project/pull/352), [#354](https://github.com/taiki-e/pin-project/pull/354), thanks @maurer and @daxpedda)
## [1.0.12] - 2022-08-15
- Suppress `unused_tuple_struct_fields` lint in generated code.
## [1.0.11] - 2022-07-02
## [1.0.10] - 2021-12-31
- Revert the increase of the minimal version of `syn` that was done in 1.0.9.
## [1.0.9] - 2021-12-26
- Update minimal version of `syn` to 1.0.84.
## [1.0.8] - 2021-07-21
- [Suppress `clippy::use_self` and `clippy::type_repetition_in_bounds` lints in generated code.](https://github.com/taiki-e/pin-project/pull/331)
## [1.0.7] - 2021-04-16
- [Fix compile error when using `self::` as prefix of path inside `#[pinned_drop]` impl.](https://github.com/taiki-e/pin-project/pull/326)
## [1.0.6] - 2021-03-25
- [Suppress `clippy::semicolon_if_nothing_returned` lint in generated code.](https://github.com/taiki-e/pin-project/pull/318)
## [1.0.5] - 2021-02-03
## [1.0.4] - 2021-01-09
- [Suppress `clippy::ref_option_ref` lint in generated code.](https://github.com/taiki-e/pin-project/pull/308)
## [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
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/commit/ddcd88079ba2d82857c365f2a3543ad146ade54c).
- [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
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/commit/ddcd88079ba2d82857c365f2a3543ad146ade54c).
- [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<T> {
Variant(#[pin] T),
}
- #[project]
fn func<T>(x: Pin<&mut Enum<T>>) {
- #[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.
- [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<T> {
Variant(#[pin] T),
}
- #[project]
fn func<T>(x: Pin<&mut Enum<T>>) {
- #[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.
- 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.
## [0.4.30] - 2022-07-02
## [0.4.29] - 2021-12-26
## [0.4.28] - 2021-03-28
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Fix `unused_must_use` warning on unused borrows, which will be added to rustc in the future.](https://github.com/taiki-e/pin-project/pull/322) See [#322](https://github.com/taiki-e/pin-project/pull/322) for more details.
(Note: 1.0 does not have this problem.)
## [0.4.27] - 2020-10-11
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- Update minimal version of `syn` to 1.0.44.
## [0.4.26] - 2020-10-04
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Fix drop order of pinned fields in `project_replace`.](https://github.com/taiki-e/pin-project/pull/287)
## [0.4.25] - 2020-10-01
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Suppress `drop_bounds` lint, which will be added to rustc in the future.](https://github.com/taiki-e/pin-project/pull/273) 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
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Fix compatibility of generated code with `forbid(future_incompatible)`.](https://github.com/taiki-e/pin-project/pull/282)
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
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Fix compile error with `?Sized` type parameters.](https://github.com/taiki-e/pin-project/pull/263)
## [0.4.22] - 2020-06-14
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- Documentation improvements.
## [0.4.21] - 2020-06-13
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Deprecated `#[project]`, `#[project_ref]`, and `#[project_replace]` attributes due to some unfixable limitations.](https://github.com/taiki-e/pin-project/pull/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<T> {
Variant(#[pin] T),
}
fn func<T>(x: Pin<&mut Enum<T>>) {
match x.project() {
EnumProj::Variant(y) => {
let _: Pin<&mut T> = y;
}
}
}
```
- [Support `Self` in fields and generics in type definitions.](https://github.com/taiki-e/pin-project/pull/245)
- [Fix errors involving *"`self` value is a keyword only available in methods with `self` parameter"* in apparently correct code.](https://github.com/taiki-e/pin-project/pull/250)
- Diagnostic improvements.
## [0.4.20] - 2020-06-07
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [You can now use `project_replace` argument without Replace argument.](https://github.com/taiki-e/pin-project/pull/243)
This used to require you to specify both.
```diff
- #[pin_project(Replace, project_replace = EnumProjOwn)]
+ #[pin_project(project_replace = EnumProjOwn)]
enum Enum<T> {
Variant(#[pin] T)
}
```
- [Make `project_replace` argument an alias for `Replace` argument so that it can be used without a value.](https://github.com/taiki-e/pin-project/pull/243)
```rust
#[pin_project(project_replace)]
enum Enum<T> {
Variant(#[pin] T)
}
```
*The `Replace` argument will be deprecated in the future.*
- [Suppress `unreachable_pub` lint in generated code.](https://github.com/taiki-e/pin-project/pull/240)
## [0.4.19] - 2020-06-04
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Suppress `unused_results` lint in generated code.](https://github.com/taiki-e/pin-project/pull/239)
## [0.4.18] - 2020-06-04
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Support `Self` in more syntax positions inside `#[pinned_drop]` impl.](https://github.com/taiki-e/pin-project/pull/230)
- [Suppress `clippy::type_repetition_in_bounds` and `clippy::used_underscore_binding` lints in generated code.](https://github.com/taiki-e/pin-project/pull/233)
- Documentation improvements.
- Diagnostic improvements.
## [0.4.17] - 2020-05-18
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
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<T> {
Variant(#[pin] T),
}
fn func<T>(x: Pin<&mut Enum<T>>) {
match x.project() {
EnumProj::Variant(y) => {
let _: Pin<&mut T> = y;
}
}
}
```
## [0.4.16] - 2020-05-11
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Fix an issue that users can call internal function generated by `#[pinned_drop]`.](https://github.com/taiki-e/pin-project/pull/223)
## [0.4.15] - 2020-05-10
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [`#[project]` attribute can now handle all `project*` attributes in that scope with one wrapper attribute.](https://github.com/taiki-e/pin-project/pull/220)
## [0.4.14] - 2020-05-09
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Add `!Unpin` option to `#[pin_project]` attribute for guarantee the type is `!Unpin`.](https://github.com/taiki-e/pin-project/pull/219)
```rust
#[pin_project(!Unpin)]
struct Struct<T, U> {
field: T,
}
```
This is equivalent to use `#[pin]` attribute for `PhantomPinned` field.
```rust
#[pin_project]
struct Struct<T, U> {
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)*
- [Fix an issue where duplicate `#[project]` attributes were ignored.](https://github.com/taiki-e/pin-project/pull/218)
- [Suppress `single_use_lifetimes` lint in generated code.](https://github.com/taiki-e/pin-project/pull/217)
- [Hide generated items from --document-private-items.](https://github.com/taiki-e/pin-project/pull/211) See [#211](https://github.com/taiki-e/pin-project/pull/211) for details.
- Documentation improvements.
## [0.4.13] - 2020-05-07
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
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):
- [Fix an issue that `#[project]` on non-statement expression does not work without unstable features.](https://github.com/taiki-e/pin-project/pull/197)
- [Suppress `clippy::needless_pass_by_value` lint in generated code of `#[pinned_drop]`.](https://github.com/taiki-e/pin-project/pull/200)
- Documentation improvements.
- Diagnostic improvements.
## [0.4.12] - 2020-05-07
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- A release to avoid [a regression in 0.4.11](https://github.com/taiki-e/pin-project/issues/206). No code changes from [0.4.10](https://github.com/taiki-e/pin-project/releases/tag/v0.4.10).
## [0.4.11] - 2020-05-07
**Note:** This release has been yanked. See [#206](https://github.com/taiki-e/pin-project/issues/206) for details.
- [Fix an issue that `#[project]` on non-statement expression does not work without unstable features.](https://github.com/taiki-e/pin-project/pull/197)
- [Suppress `clippy::needless_pass_by_value` lint in generated code of `#[pinned_drop]`.](https://github.com/taiki-e/pin-project/pull/200)
- Documentation improvements.
- Diagnostic improvements.
## [0.4.10] - 2020-05-04
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Add `project_replace` method and `#[project_replace]` attribute.](https://github.com/taiki-e/pin-project/pull/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.](https://github.com/taiki-e/pin-project/pull/190)
- [Hide all generated items except for projected types from calling code.](https://github.com/taiki-e/pin-project/pull/192) See [#192](https://github.com/taiki-e/pin-project/pull/192) for details.
## [0.4.9] - 2020-04-14
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Fix lifetime inference error when associated types are used in fields.](https://github.com/taiki-e/pin-project/pull/188)
- [Fix compile error with tuple structs with `where` clauses.](https://github.com/taiki-e/pin-project/pull/186)
- [`#[project]` attribute can now be used for `if let` expressions.](https://github.com/taiki-e/pin-project/pull/181)
## [0.4.8] - 2020-01-27
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Ensure that users cannot implement `PinnedDrop` without proper attribute argument.](https://github.com/taiki-e/pin-project/pull/180)
- [Fix use of `Self` in expression position inside `#[pinned_drop]` impl.](https://github.com/taiki-e/pin-project/pull/177)
## [0.4.7] - 2020-01-20
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
## [0.4.6] - 2019-11-20
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Fix compile error when there is `Self` in the where clause.](https://github.com/taiki-e/pin-project/pull/169)
## [0.4.5] - 2019-10-21
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
## [0.4.4] - 2019-10-17
**Note:** This release has been yanked because it [failed to compile with syn 1.0.84 and later](https://github.com/taiki-e/pin-project/pull/335).
- [Fix an issue where `PinnedDrop` implementations can call unsafe code without an unsafe block.](https://github.com/taiki-e/pin-project/pull/149)
## [0.4.3] - 2019-10-15
**Note:** This release has been yanked. See [#148](https://github.com/taiki-e/pin-project/pull/148) for details.
- [`#[pin_project]` can now interoperate with `#[cfg_attr()]`.](https://github.com/taiki-e/pin-project/pull/135)
- [`#[pin_project]` can now interoperate with `#[cfg()]` on tuple structs and tuple variants.](https://github.com/taiki-e/pin-project/pull/135)
- [Fix support for DSTs(Dynamically Sized Types) on `#[pin_project(UnsafeUnpin)]`](https://github.com/taiki-e/pin-project/pull/120)
- Diagnostic improvements.
## [0.4.2] - 2019-09-29
**Note:** This release has been yanked. See [#148](https://github.com/taiki-e/pin-project/pull/148) for details.
## [0.4.1] - 2019-09-26
**Note:** This release has been yanked. See [#148](https://github.com/taiki-e/pin-project/pull/148) for details.
- [Fix an issue that caused an error when using `#[pin_project]` on a type that has `#[pin]` + `!Unpin` field with no generics or lifetime.](https://github.com/taiki-e/pin-project/pull/111)
## [0.4.0] - 2019-09-25
**Note:** This release has been yanked. See [#148](https://github.com/taiki-e/pin-project/pull/148) for details.
- [**Pin projection has become a safe operation.**](https://github.com/taiki-e/pin-project/pull/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](https://github.com/taiki-e/pin-project/pull/18), [#33](https://github.com/taiki-e/pin-project/pull/33))
- [The `Unpin` argument has been removed - an `Unpin` impl is now generated by default.](https://github.com/taiki-e/pin-project/pull/18)
- Drop impls must be specified with `#[pinned_drop]` instead of via a normal `Drop` impl. ([#18](https://github.com/taiki-e/pin-project/pull/18), [#33](https://github.com/taiki-e/pin-project/pull/33), [#86](https://github.com/taiki-e/pin-project/pull/86))
- [`Unpin` impls must be specified with an impl of `UnsafeUnpin`, instead of implementing the normal `Unpin` trait.](https://github.com/taiki-e/pin-project/pull/18)
- [`#[pin_project]` attribute now determines the visibility of the projection type/method is based on the original type.](https://github.com/taiki-e/pin-project/pull/96)
- [`#[pin_project]` can now be used for public type with private field types.](https://github.com/taiki-e/pin-project/pull/53)
- [`#[pin_project]` can now interoperate with `#[cfg()]`.](https://github.com/taiki-e/pin-project/pull/77)
- [Add `project_ref` method to `#[pin_project]` types.](https://github.com/taiki-e/pin-project/pull/93)
- [Remove "project_attr" feature and always enable `#[project]` attribute.](https://github.com/taiki-e/pin-project/pull/94)
- [`#[project]` attribute can now be used for `impl` blocks.](https://github.com/taiki-e/pin-project/pull/46)
- [`#[project]` attribute can now be used for `use` statements.](https://github.com/taiki-e/pin-project/pull/85)
- [`#[project]` attribute now supports `match` expressions at the position of the initializer expression of `let` expressions.](https://github.com/taiki-e/pin-project/pull/51)
Changes since the 0.4.0-beta.1 release:
- [Fix 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.](https://github.com/taiki-e/pin-project/pull/107)
## [0.4.0-beta.1] - 2019-09-21
- [Change the argument type of project method back to `self: Pin<&mut Self>`.](https://github.com/taiki-e/pin-project/pull/90)
- [Remove "project_attr" feature and always enable `#[project]` attribute.](https://github.com/taiki-e/pin-project/pull/94)
- [`#[project]` attribute can now be used for `use` statements.](https://github.com/taiki-e/pin-project/pull/85)
- [Add `project_ref` method and `#[project_ref]` attribute.](https://github.com/taiki-e/pin-project/pull/93)
- [`#[pin_project]` attribute now determines the visibility of the projection type/method is based on the original type.](https://github.com/taiki-e/pin-project/pull/96)
## [0.4.0-alpha.11] - 2019-09-11
```rust
#[pinned_drop]
impl<T> PinnedDrop for Foo<'_, T> {
fn drop(mut self: Pin<&mut Self>) {
**self.project().was_dropped = true;
}
}
```
- Add some examples and generated code.
- Diagnostic improvements.
## [0.4.0-alpha.10] - 2019-09-07
- [`#[pin_project]` can now interoperate with `#[cfg()]`.](https://github.com/taiki-e/pin-project/pull/77)
- Documentation improvements.
## [0.4.0-alpha.9] - 2019-09-05
- [Add `project_into` method to `#[pin_project]` types](https://github.com/taiki-e/pin-project/pull/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
}
```
- [Prevent `UnpinStruct` from appearing in the document by default.](https://github.com/taiki-e/pin-project/pull/71) See [#71](https://github.com/taiki-e/pin-project/pull/71) for more details.
## [0.4.0-alpha.8] - 2019-09-03
- [Improve document of generated code.](https://github.com/taiki-e/pin-project/pull/62). Also added an option to control the document of generated code. See [#62](https://github.com/taiki-e/pin-project/pull/62) for more details.
## [0.4.0-alpha.7] - 2019-09-02
## [0.4.0-alpha.6] - 2019-09-01
- [Allow using `#[pin_project]` type with private field types](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.](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
- [Change `project` method generated by `#[pin_project]` attribute to take an `&mut Pin<&mut Self>` argument.](https://github.com/taiki-e/pin-project/pull/47)
- [`#[project]` attribute can now be used for impl blocks.](https://github.com/taiki-e/pin-project/pull/46)
- [`#[pin_project]` attribute can now detect that the type used does not have its own drop implementation without actually implementing drop.](https://github.com/taiki-e/pin-project/pull/48) This removed some restrictions.
## [0.4.0-alpha.2] - 2019-08-13
- Update `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.
- Make `#[project]` attribute disabled by default.
## [0.3.5] - 2019-08-14
- Update `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](https://github.com/taiki-e/pin-project/issues/16) for details.
- Diagnostic improvements.
## [0.3.2] - 2019-03-30
- Avoid suffixes on tuple index.
## [0.3.1] - 2019-03-02
- Documentation improvements.
- Update minimum `syn` version to 0.15.22.
## [0.3.0] - 2019-02-20
- Remove `unsafe_fields` attribute.
- Remove `unsafe_variants` attribute.
## [0.2.2] - 2019-02-20
- Fix a bug that generates incorrect code for the some structures with trait bounds on type generics.
## [0.2.1] - 2019-02-20
- Fix a bug that generates incorrect code for the structures with where clause and associated type fields.
## [0.2.0] - 2019-02-11
- Make `unsafe_fields` optional.
- Documentation improvements.
## [0.1.8] - 2019-02-02
- Add the feature to create projected enums to `unsafe_project`.
- Add `project` attribute to support pattern matching.
## [0.1.7] - 2019-01-19
- Fix documentation.
## [0.1.6] - 2019-01-19
- `unsafe_fields` can now opt-out.
- Add `unsafe_variants` attribute. This attribute is available if pin-project is built with the "unsafe_variants" feature.
## [0.1.5] - 2019-01-17
- Add support for tuple struct to `unsafe_project`.
## [0.1.4] - 2019-01-12
- Add options for automatically implementing `Unpin` to both `unsafe_project` and `unsafe_fields`.
## [0.1.3] - 2019-01-11
- Fix dependencies.
- Add `unsafe_fields` attribute.
## [0.1.2] - 2019-01-09
- Documentation improvements.
## [0.1.1] - 2019-01-08
- Rename from `unsafe_pin_project` to `unsafe_project`.
## [0.1.0] - 2019-01-08
**Note:** This release has been yanked.
Initial release