# Change Log
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](http://keepachangelog.com/)
and this project adheres to [Semantic Versioning](http://semver.org/).
## 0.99.4 - 2020-03-28
### New features
- Support for deriving `Error`!!! (many thanks to @ffuugoo and @tyranron)
### Fixes
- Fix generic bounds for `Deref` and `DerefMut` with `forward`, i.e. put `Deref`
bound on whole type, so on `where Box<T>: Deref` instead of on `T: Deref`.
([#107](https://github.com/JelteF/derive_more/issues/114))
- The `tests` directory is now correctly included in the crate (requested by
Debian package maintainers)
## 0.99.3 - 2020-02-19
### Fixes
- Fix generic bounds for `Deref` and `DerefMut` with no `forward`, i.e. no bounds
are necessary. ([#107](https://github.com/JelteF/derive_more/issues/114))
## 0.99.2 - 2019-11-17
### Fixes
- Hotfix for a regression in allowed `Display` derives using `#` flag, such as
`{:#b}` ([#107](https://github.com/JelteF/derive_more/issues/107))
## 0.99.1 - 2019-11-12
### Fixes
- Hotfix for a regression in allowed `From` derives
([#105](https://github.com/JelteF/derive_more/issues/105))
## 0.99.0 - 2019-11-11
This release is a huge milestone for this library.
Lot's of new derives are implemented and a ton of attributes are added for
configuration purposes.
These attributes will allow future releases to add features/options without
breaking backwards compatibility.
This is why the next release with breaking changes is planned to be 1.0.0.
### Breaking changes
- Requires Rust 1.36+
- When using in a Rust 2015 crate, you should add `extern crate core` to your
code.
- `no_std` feature is removed, the library now supports `no_std` without having
to configure any features.
- `Deref` derives now dereference to the type in the newtype. So if you have
`MyBox(Box<i32>)`, dereferencing it will result in a `Box<i32>` not an `i32`.
To get the old behaviour of forwarding the dereference you can add the
`#[deref(forward)]` attribute on the struct or field.
### New features
- Derives for `AsRef`, `AsMut`, `Sum`, `Product`, `IntoIterator`.
- Choosing the field of a struct for which to derive the newtype derive.
- Ignoring variants of enums when deriving `From`, by using `#[from(ignore)]`.
- Add `#[from(forward)]` attribute for `From` derives. This forwards the `from`
calls to the fields themselves. So if your field is an `i64` you can call from
on an `i32` and it will work.
- Add `#[mul(forward)]` and `#[mul_assign(forward)]`, which implement `Mul` and
`MulAssign` with the semantics as if they were `Add`/`AddAssign`.
- You can use features to cut down compile time of the crate by only compiling
the code needed for the derives that you use. (see Cargo.toml for the
features, by default they are all on)
- Add `#[into(owned, ref, ref_mut)]` and `#[try_into(owned, ref, ref_mut)]`
attributes. These cause the `Into` and `TryInto` derives to also implement
derives that return references to the inner fields.
- Make `no_std` work out of the box
- Allow `#[display(fmt="some shared display text for all enum variants {}")]`
attribute on enum.
- Better bounds inference of `Display` trait.
### Other things
- Remove dependency on `regex` to cut down compile time.
- Use `syn` 1.0
## 0.15.0 - 2019-06-08
- Automatic detection of traits needed for `Display` format strings
## 0.14.0 - 2019-02-02
- Added `no_std` support
- Suppress `unused_variables` warnings in derives
## 0.13.0 - 2018-10-19
- Updated to `syn` v0.15
- Extended Display-like derives to support custom formats
## 0.12.0 - 2018-09-19
### Changed
- Updated to `syn` v0.14, `quote` v0.6 and `proc-macro2` v0.4
## 0.11.0 - 2018-05-12
### Changed
- Updated to latest version of `syn` and `quote`
### Fixed
- Changed some URLs in the docs so they were correct on crates.io and docs.rs
- The `Result` type is now referenced in the derives using its absolute path
(`::std::result::Result`) to make sure that the derives don't accidentally use
another `Result` type that is in scope.
## 0.10.0 - 2018-03-29
### Added
- Allow deriving of `TryInto`
- Allow deriving of `Deref`
- Allow deriving of `DerefMut`
## 0.9.0 - 2018-03-18
### Added
- Allow deriving of `Display`, `Binary`, `Octal`, `LowerHex`, `UpperHex`, `LowerExp`, `UpperExp`, `Pointer`
- Allow deriving of `Index`
- Allow deriving of `IndexMut`
### Fixed
- Allow cross crate inlining of derived methods
### Internal changes
- Fix most `clippy` warnings
## 0.8.0 - 2018-03-10
### Added
- Allow deriving of `FromStr`
### Changed
- Updated to latest version of `syn` and `quote`
## 0.7.1 - 2018-01-25
### Fixed
- Add `#[allow(missing_docs)]` to the Constructor definition
### Internal changes
- Run `rustfmt` on the code
## 0.7.0 - 2017-07-25
### Changed
- Changed code to work with newer version of the `syn` library.
## 0.6.2 - 2017-04-23
### Changed
- Deriving `From`, `Into` and `Constructor` now works for empty structs.
## 0.6.1 - 2017-03-08
### Changed
- The `new()` method that is created when deriving `Constructor` is now public.
This makes it a lot more useful.
## 0.6.0 - 2017-02-20
### Added
- Derives for `Into`, `Constructor` and `MulAssign`-like
### Changed
- `From` is now derived for enum variants with multiple fields.
### Fixed
- Derivations now support generics.
## 0.5.0 - 2017-02-02
### Added
- Lots of docs.
- Derives for `Neg`-like and `AddAssign`-like.
### Changed
- `From` can now be derived for structs with multiple fields.