# 2.11.1## What's Changed* Bless compile-fail tests for current beta by @DanielEScherzer in https://github.com/bitflags/bitflags/pull/478* example_generated.rs: add missing third slash for doc comment by @DanielEScherzer in https://github.com/bitflags/bitflags/pull/477* Clarify self and other in method docs by @KodrAus in https://github.com/bitflags/bitflags/pull/481## New Contributors* @DanielEScherzer made their first contribution in https://github.com/bitflags/bitflags/pull/478**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.11.0...2.11.1# 2.11.0## What's Changed* Fix use of Result in macro output by @james7132 in https://github.com/bitflags/bitflags/pull/462* Add methods to get the known/unknown bits from a flags value by @WaterWhisperer in https://github.com/bitflags/bitflags/pull/473## New Contributors* @james7132 made their first contribution in https://github.com/bitflags/bitflags/pull/462* @WaterWhisperer made their first contribution in https://github.com/bitflags/bitflags/pull/473**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.10.0...2.11.0# 2.10.0## What's Changed* Implement iterator for all named flags by @ssrlive in https://github.com/bitflags/bitflags/pull/465* Depend on serde_core instead of serde by @KodrAus in https://github.com/bitflags/bitflags/pull/467## New Contributors* @ssrlive made their first contribution in https://github.com/bitflags/bitflags/pull/465**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.9.4...2.10.0# 2.9.4## What's Changed* Add Cargo features to readme by @KodrAus in https://github.com/bitflags/bitflags/pull/460**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.9.3...2.9.4# 2.9.3## What's Changed* Streamline generated code by @nnethercote in https://github.com/bitflags/bitflags/pull/458## New Contributors* @nnethercote made their first contribution in https://github.com/bitflags/bitflags/pull/458**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.9.2...2.9.3# 2.9.2## What's Changed* Fix difference in the spec by @KodrAus in https://github.com/bitflags/bitflags/pull/446* Fix up inaccurate docs on bitflags_match by @KodrAus in https://github.com/bitflags/bitflags/pull/453* Remove rustc internal crate feature by @KodrAus in https://github.com/bitflags/bitflags/pull/454**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.9.1...2.9.2# 2.9.1## What's Changed* Document Cargo features by @KodrAus in https://github.com/bitflags/bitflags/pull/444**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.9.0...2.9.1# 2.9.0## What's Changed* `Flags` trait: add `clear(&mut self)` method by @wysiwys in https://github.com/bitflags/bitflags/pull/437* Fix up UI tests by @KodrAus in https://github.com/bitflags/bitflags/pull/438**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.8.0...2.9.0# 2.8.0## What's Changed* feat(core): Add bitflags_match macro for bitflag matching by @YuniqueUnic in https://github.com/bitflags/bitflags/pull/423* Finalize bitflags_match by @KodrAus in https://github.com/bitflags/bitflags/pull/431## New Contributors* @YuniqueUnic made their first contribution in https://github.com/bitflags/bitflags/pull/423**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.7.0...2.8.0# 2.7.0## What's Changed* Fix `clippy::doc_lazy_continuation` lints by @waywardmonkeys in https://github.com/bitflags/bitflags/pull/414* Run clippy on extra features in CI. by @waywardmonkeys in https://github.com/bitflags/bitflags/pull/415* Fix CI: trybuild refresh, allow some clippy restrictions. by @waywardmonkeys in https://github.com/bitflags/bitflags/pull/417* Update zerocopy version in example by @KodrAus in https://github.com/bitflags/bitflags/pull/422* Add method to check if unknown bits are set by @wysiwys in https://github.com/bitflags/bitflags/pull/426* Update error messages by @KodrAus in https://github.com/bitflags/bitflags/pull/427* Add `truncate(&mut self)` method to unset unknown bits by @wysiwys in https://github.com/bitflags/bitflags/pull/428* Update error messages by @KodrAus in https://github.com/bitflags/bitflags/pull/429## New Contributors* @wysiwys made their first contribution in https://github.com/bitflags/bitflags/pull/426**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.6.0...2.7.0# 2.6.0## What's Changed* Sync CHANGELOG.md with github release notes by @dextero in https://github.com/bitflags/bitflags/pull/402* Update error messages and zerocopy by @KodrAus in https://github.com/bitflags/bitflags/pull/403* Bump minimum declared versions of dependencies by @dextero in https://github.com/bitflags/bitflags/pull/404* chore(deps): bump serde_derive and bytemuck versions by @joshka in https://github.com/bitflags/bitflags/pull/405* add OSFF Scorecard workflow by @KodrAus in https://github.com/bitflags/bitflags/pull/396* Update stderr messages by @KodrAus in https://github.com/bitflags/bitflags/pull/408* Fix typo by @waywardmonkeys in https://github.com/bitflags/bitflags/pull/410* Allow specifying outer attributes in impl mode by @KodrAus in https://github.com/bitflags/bitflags/pull/411## New Contributors* @dextero made their first contribution in https://github.com/bitflags/bitflags/pull/402* @joshka made their first contribution in https://github.com/bitflags/bitflags/pull/405* @waywardmonkeys made their first contribution in https://github.com/bitflags/bitflags/pull/410**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.5.0...2.6.0# 2.5.0## What's Changed* Derive `Debug` for `Flag<B>` by @tgross35 in https://github.com/bitflags/bitflags/pull/398* Support truncating or strict-named variants of parsing and formatting by @KodrAus in https://github.com/bitflags/bitflags/pull/400## New Contributors* @tgross35 made their first contribution in https://github.com/bitflags/bitflags/pull/398**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.4.2...2.5.0# 2.4.2## What's Changed* Cargo.toml: Anchor excludes to root of the package by @jamessan in https://github.com/bitflags/bitflags/pull/387* Update error messages by @KodrAus in https://github.com/bitflags/bitflags/pull/390* Add support for impl mode structs to be repr(packed) by @GnomedDev in https://github.com/bitflags/bitflags/pull/388* Remove old `unused_tuple_struct_fields` lint by @dtolnay in https://github.com/bitflags/bitflags/pull/393* Delete use of `local_inner_macros` by @dtolnay in https://github.com/bitflags/bitflags/pull/392## New Contributors* @jamessan made their first contribution in https://github.com/bitflags/bitflags/pull/387* @GnomedDev made their first contribution in https://github.com/bitflags/bitflags/pull/388**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.4.1...2.4.2# 2.4.1## What's Changed* Allow some new pedantic clippy lints by @KodrAus in https://github.com/bitflags/bitflags/pull/380**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.4.0...2.4.1# 2.4.0## What's Changed* Remove html_root_url by @eldruin in https://github.com/bitflags/bitflags/pull/368* Support unnamed flags by @KodrAus in https://github.com/bitflags/bitflags/pull/371* Update smoke test to verify all Clippy and rustc lints by @MitMaro in https://github.com/bitflags/bitflags/pull/374* Specify the behavior of bitflags by @KodrAus in https://github.com/bitflags/bitflags/pull/369## New Contributors* @eldruin made their first contribution in https://github.com/bitflags/bitflags/pull/368* @MitMaro made their first contribution in https://github.com/bitflags/bitflags/pull/374**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.3.3...2.4.0# 2.3.3## Changes to `-=`The `-=` operator was incorrectly changed to truncate bits that didn't correspond to valid flags in `2.3.0`. This hasbeen fixed up so it once again behaves the same as `-` and `difference`.## Changes to `!`The `!` operator previously called `Self::from_bits_truncate`, which would truncate any bits that only partiallyoverlapped with a valid flag. It will now use `bits & Self::all().bits()`, so any bits that overlap any bitsspecified by any flag will be respected. This is unlikely to have any practical implications, but enables defininga flag like `const ALL = !0` as a way to signal that any bit pattern is a known set of flags.## Changes to formattingZero-valued flags will never be printed. You'll either get `0x0` for empty flags using debug formatting, or theset of flags with zero-valued flags omitted for others.Composite flags will no longer be redundantly printed if there are extra bits to print at the end that don't correspondto a valid flag.## What's Changed* Fix up incorrect sub assign behavior and other cleanups by @KodrAus in https://github.com/bitflags/bitflags/pull/366**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.3.2...2.3.3# 2.3.2## What's Changed* [doc] [src/lib.rs]  delete redundant path prefix by @OccupyMars2025 in https://github.com/bitflags/bitflags/pull/361## New Contributors* @OccupyMars2025 made their first contribution in https://github.com/bitflags/bitflags/pull/361**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.3.1...2.3.2# 2.3.1## What's Changed* Fix Self in flags value expressions by @KodrAus in https://github.com/bitflags/bitflags/pull/355**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.3.0...2.3.1# 2.3.0## Major changes### `BitFlags` trait deprecated in favor of `Flags` traitThis release introduces the `Flags` trait and deprecates the `BitFlags` trait. These two traits are semver compatible so if you have public API code depending on `BitFlags` you can move to `Flags` without breaking end-users. This is possible because the `BitFlags` trait was never publicly implementable, so it now carries `Flags` as a supertrait. All implementations of `Flags` additionally implement `BitFlags`.The `Flags` trait is a publicly implementable version of the old `BitFlags` trait. The original `BitFlags` trait carried some macro baggage that made it difficult to implement, so a new `Flags` trait has been introduced as the _One True Trait_ for interacting with flags types generically. See the the `macro_free` and `custom_derive` examples for more details.### `Bits` trait publicly exposedThe `Bits` trait for the underlying storage of flags values is also now publicly implementable. This lets you define your own exotic backing storage for flags. See the `custom_bits_type` example for more details.## What's Changed* Use explicit hashes for actions steps by @KodrAus in https://github.com/bitflags/bitflags/pull/350* Support ejecting flags types from the bitflags macro by @KodrAus in https://github.com/bitflags/bitflags/pull/351**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.2.1...2.3.0# 2.2.1## What's Changed* Refactor attribute filtering to apply per-flag by @KodrAus in https://github.com/bitflags/bitflags/pull/345**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.2.0...2.2.1# 2.2.0## What's Changed* Create SECURITY.md by @KodrAus in https://github.com/bitflags/bitflags/pull/338* add docs to describe the behavior of multi-bit flags by @nicholasbishop in https://github.com/bitflags/bitflags/pull/340* Add support for bytemuck by @KodrAus in https://github.com/bitflags/bitflags/pull/336* Add a top-level macro for filtering attributes by @KodrAus in https://github.com/bitflags/bitflags/pull/341## New Contributors* @nicholasbishop made their first contribution in https://github.com/bitflags/bitflags/pull/340**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.1.0...2.2.0# 2.1.0## What's Changed* Add docs for the internal Field0 and examples of formatting/parsing by @KodrAus in https://github.com/bitflags/bitflags/pull/328* Add support for arbitrary by @KodrAus in https://github.com/bitflags/bitflags/pull/324* Fix up missing docs for consts within consts by @KodrAus in https://github.com/bitflags/bitflags/pull/330* Ignore clippy lint in generated code by @Jake-Shadle in https://github.com/bitflags/bitflags/pull/331## New Contributors* @Jake-Shadle made their first contribution in https://github.com/bitflags/bitflags/pull/331**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.0.2...2.1.0# 2.0.2## What's Changed* Fix up missing isize and usize Bits impls by @KodrAus in https://github.com/bitflags/bitflags/pull/321**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.0.1...2.0.2# 2.0.1## What's Changed* Fix up some docs issues by @KodrAus in https://github.com/bitflags/bitflags/pull/309* Make empty_flag() const. by @tormeh in https://github.com/bitflags/bitflags/pull/313* Fix formatting of multi-bit flags with partial overlap by @KodrAus in https://github.com/bitflags/bitflags/pull/316## New Contributors* @tormeh made their first contribution in https://github.com/bitflags/bitflags/pull/313**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.0.0...2.0.1# 2.0.0## Major changesThis release includes some major changes over `1.x`. If you use `bitflags!` types in your public API then upgrading this library may cause breakage in your downstream users.### ⚠️ SerializationYou'll need to add the `serde` Cargo feature in order to `#[derive(Serialize, Deserialize)]` on your generated flags types:```rustbitflags! {    #[derive(Serialize, Deserialize)]    #[serde(transparent)]    pub struct Flags: T {        ..    }}```where `T` is the underlying bits type you're using, such as `u32`.The default serialization format with `serde` **has changed** if you `#[derive(Serialize, Deserialize)]` on your generated flags types. It will now use a formatted string for human-readable formats and the underlying bits type for compact formats.To keep the old format, see the https://github.com/KodrAus/bitflags-serde-legacy library.### ⚠️ TraitsGenerated flags types now derive fewer traits. If you need to maintain backwards compatibility, you can derive the following yourself:```rust#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Clone, Copy)]```### ⚠️ MethodsThe unsafe `from_bits_unchecked` method is now a safe `from_bits_retain` method.You can add the following method to your generated types to keep them compatible:```rust#[deprecated = "use the safe `from_bits_retain` method instead"]pub unsafe fn from_bits_unchecked(bits: T) -> Self {    Self::from_bits_retain(bits)}```where `T` is the underlying bits type you're using, such as `u32`.### ⚠️ `.bits` fieldYou can now use the `.bits()` method instead of the old `.bits`.The representation of generated flags types has changed from a struct with the single field `bits` to a newtype.## What's Changed* Fix a typo and call out MSRV bump by @KodrAus in https://github.com/bitflags/bitflags/pull/259* BitFlags trait by @arturoc in https://github.com/bitflags/bitflags/pull/220* Add a hidden trait to discourage manual impls of BitFlags by @KodrAus in https://github.com/bitflags/bitflags/pull/261* Sanitize `Ok` by @konsumlamm in https://github.com/bitflags/bitflags/pull/266* Fix bug in `Debug` implementation by @konsumlamm in https://github.com/bitflags/bitflags/pull/268* Fix a typo in the generated documentation by @wackbyte in https://github.com/bitflags/bitflags/pull/271* Use SPDX license format by @atouchet in https://github.com/bitflags/bitflags/pull/272* serde tests fail in CI by @arturoc in https://github.com/bitflags/bitflags/pull/277* Fix beta test output by @KodrAus in https://github.com/bitflags/bitflags/pull/279* Add example to the README.md file by @tiaanl in https://github.com/bitflags/bitflags/pull/270* Iterator over all the enabled options by @arturoc in https://github.com/bitflags/bitflags/pull/278* from_bits_(truncate) fail with composite flags by @arturoc in https://github.com/bitflags/bitflags/pull/276* Add more platform coverage to CI by @KodrAus in https://github.com/bitflags/bitflags/pull/280* rework the way cfgs are handled by @KodrAus in https://github.com/bitflags/bitflags/pull/281* Split generated code into two types by @KodrAus in https://github.com/bitflags/bitflags/pull/282* expose bitflags iters using nameable types by @KodrAus in https://github.com/bitflags/bitflags/pull/286* Support creating flags from their names by @KodrAus in https://github.com/bitflags/bitflags/pull/287* Update README.md by @KodrAus in https://github.com/bitflags/bitflags/pull/288* Prepare for 2.0.0-rc.1 release by @KodrAus in https://github.com/bitflags/bitflags/pull/289* Add missing "if" to contains doc-comment in traits.rs by @rusty-snake in https://github.com/bitflags/bitflags/pull/291* Forbid unsafe_code by @fintelia in https://github.com/bitflags/bitflags/pull/294* serde: enable no-std support by @nim65s in https://github.com/bitflags/bitflags/pull/296* Add a parser for flags formatted as bar-separated-values by @KodrAus in https://github.com/bitflags/bitflags/pull/297* Prepare for 2.0.0-rc.2 release by @KodrAus in https://github.com/bitflags/bitflags/pull/299* Use strip_prefix instead of starts_with + slice by @QuinnPainter in https://github.com/bitflags/bitflags/pull/301* Fix up some clippy lints by @KodrAus in https://github.com/bitflags/bitflags/pull/302* Prepare for 2.0.0-rc.3 release by @KodrAus in https://github.com/bitflags/bitflags/pull/303* feat: Add minimum permissions to rust.yml workflow by @gabibguti in https://github.com/bitflags/bitflags/pull/305## New Contributors* @wackbyte made their first contribution in https://github.com/bitflags/bitflags/pull/271* @atouchet made their first contribution in https://github.com/bitflags/bitflags/pull/272* @tiaanl made their first contribution in https://github.com/bitflags/bitflags/pull/270* @rusty-snake made their first contribution in https://github.com/bitflags/bitflags/pull/291* @fintelia made their first contribution in https://github.com/bitflags/bitflags/pull/294* @nim65s made their first contribution in https://github.com/bitflags/bitflags/pull/296* @QuinnPainter made their first contribution in https://github.com/bitflags/bitflags/pull/301* @gabibguti made their first contribution in https://github.com/bitflags/bitflags/pull/305**Full Changelog**: https://github.com/bitflags/bitflags/compare/1.3.2...2.0.0# 2.0.0-rc.3## What's Changed* Use strip_prefix instead of starts_with + slice by @QuinnPainter in https://github.com/bitflags/bitflags/pull/301* Fix up some clippy lints by @KodrAus in https://github.com/bitflags/bitflags/pull/302## New Contributors* @QuinnPainter made their first contribution in https://github.com/bitflags/bitflags/pull/301**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.0.0-rc.2...2.0.0-rc.3# 2.0.0-rc.2## Changes to `serde` serialization**⚠️ NOTE ⚠️** This release changes the default serialization you'll get if you `#[derive(Serialize, Deserialize)]`on your generated flags types. It will now use a formatted string for human-readable formats and the underlying bitstype for compact formats.To keep the old behavior, see the [`bitflags-serde-legacy`](https://github.com/KodrAus/bitflags-serde-legacy) library.## What's Changed* Add missing "if" to contains doc-comment in traits.rs by @rusty-snake in https://github.com/bitflags/bitflags/pull/291* Forbid unsafe_code by @fintelia in https://github.com/bitflags/bitflags/pull/294* serde: enable no-std support by @nim65s in https://github.com/bitflags/bitflags/pull/296* Add a parser for flags formatted as bar-separated-values by @KodrAus in https://github.com/bitflags/bitflags/pull/297## New Contributors* @rusty-snake made their first contribution in https://github.com/bitflags/bitflags/pull/291* @fintelia made their first contribution in https://github.com/bitflags/bitflags/pull/294* @nim65s made their first contribution in https://github.com/bitflags/bitflags/pull/296**Full Changelog**: https://github.com/bitflags/bitflags/compare/2.0.0-rc.1...2.0.0-rc.2# 2.0.0-rc.1This is a big release including a few years worth of work on a new `BitFlags` trait, iteration, and better macro organization for future extensibility.## What's Changed* Fix a typo and call out MSRV bump by @KodrAus in https://github.com/bitflags/bitflags/pull/259* BitFlags trait by @arturoc in https://github.com/bitflags/bitflags/pull/220* Add a hidden trait to discourage manual impls of BitFlags by @KodrAus in https://github.com/bitflags/bitflags/pull/261* Sanitize `Ok` by @konsumlamm in https://github.com/bitflags/bitflags/pull/266* Fix bug in `Debug` implementation by @konsumlamm in https://github.com/bitflags/bitflags/pull/268* Fix a typo in the generated documentation by @wackbyte in https://github.com/bitflags/bitflags/pull/271* Use SPDX license format by @atouchet in https://github.com/bitflags/bitflags/pull/272* serde tests fail in CI by @arturoc in https://github.com/bitflags/bitflags/pull/277* Fix beta test output by @KodrAus in https://github.com/bitflags/bitflags/pull/279* Add example to the README.md file by @tiaanl in https://github.com/bitflags/bitflags/pull/270* Iterator over all the enabled options by @arturoc in https://github.com/bitflags/bitflags/pull/278* from_bits_(truncate) fail with composite flags by @arturoc in https://github.com/bitflags/bitflags/pull/276* Add more platform coverage to CI by @KodrAus in https://github.com/bitflags/bitflags/pull/280* rework the way cfgs are handled by @KodrAus in https://github.com/bitflags/bitflags/pull/281* Split generated code into two types by @KodrAus in https://github.com/bitflags/bitflags/pull/282* expose bitflags iters using nameable types by @KodrAus in https://github.com/bitflags/bitflags/pull/286* Support creating flags from their names by @KodrAus in https://github.com/bitflags/bitflags/pull/287* Update README.md by @KodrAus in https://github.com/bitflags/bitflags/pull/288## New Contributors* @wackbyte made their first contribution in https://github.com/bitflags/bitflags/pull/271* @atouchet made their first contribution in https://github.com/bitflags/bitflags/pull/272* @tiaanl made their first contribution in https://github.com/bitflags/bitflags/pull/270**Full Changelog**: https://github.com/bitflags/bitflags/compare/1.3.2...2.0.0-rc.1# 1.3.2- Allow `non_snake_case` in generated flags types ([#256])[#256]: https://github.com/bitflags/bitflags/pull/256# 1.3.1- Revert unconditional `#[repr(transparent)]` ([#252])[#252]: https://github.com/bitflags/bitflags/pull/252# 1.3.0 (yanked)**This release bumps the Minimum Supported Rust Version to `1.46.0`**- Add `#[repr(transparent)]` ([#187])- End `empty` doc comment with full stop ([#202])- Fix typo in crate root docs ([#206])- Document from_bits_unchecked unsafety ([#207])- Let `is_all` ignore extra bits ([#211])- Allows empty flag definition ([#225])- Making crate accessible from std ([#227])- Make `from_bits` a const fn ([#229])- Allow multiple bitflags structs in one macro invocation ([#235])- Add named functions to perform set operations ([#244])- Fix typos in method docs ([#245])- Modernization of the `bitflags` macro to take advantage of newer features and 2018 idioms ([#246])- Fix regression (in an unreleased feature) and simplify tests ([#247])- Use `Self` and fix bug when overriding `stringify!` ([#249])[#187]: https://github.com/bitflags/bitflags/pull/187[#202]: https://github.com/bitflags/bitflags/pull/202[#206]: https://github.com/bitflags/bitflags/pull/206[#207]: https://github.com/bitflags/bitflags/pull/207[#211]: https://github.com/bitflags/bitflags/pull/211[#225]: https://github.com/bitflags/bitflags/pull/225[#227]: https://github.com/bitflags/bitflags/pull/227[#229]: https://github.com/bitflags/bitflags/pull/229[#235]: https://github.com/bitflags/bitflags/pull/235[#244]: https://github.com/bitflags/bitflags/pull/244[#245]: https://github.com/bitflags/bitflags/pull/245[#246]: https://github.com/bitflags/bitflags/pull/246[#247]: https://github.com/bitflags/bitflags/pull/247[#249]: https://github.com/bitflags/bitflags/pull/249# 1.2.1- Remove extraneous `#[inline]` attributes ([#194])[#194]: https://github.com/bitflags/bitflags/pull/194# 1.2.0- Fix typo: {Lower, Upper}Exp - {Lower, Upper}Hex ([#183])- Add support for "unknown" bits ([#188])[#183]: https://github.com/rust-lang-nursery/bitflags/pull/183[#188]: https://github.com/rust-lang-nursery/bitflags/pull/188# 1.1.0This is a re-release of `1.0.5`, which was yanked due to a bug in the RLS.# 1.0.5- Use compiletest_rs flags supported by stable toolchain ([#171])- Put the user provided attributes first ([#173])- Make bitflags methods `const` on newer compilers ([#175])[#171]: https://github.com/rust-lang-nursery/bitflags/pull/171[#173]: https://github.com/rust-lang-nursery/bitflags/pull/173[#175]: https://github.com/rust-lang-nursery/bitflags/pull/175# 1.0.4- Support Rust 2018 style macro imports ([#165])  ```rust  use bitflags::bitflags;  ```[#165]: https://github.com/rust-lang-nursery/bitflags/pull/165# 1.0.3- Improve zero value flag handling and documentation ([#157])[#157]: https://github.com/rust-lang-nursery/bitflags/pull/157# 1.0.2- 30% improvement in compile time of bitflags crate ([#156])- Documentation improvements ([#153])- Implementation cleanup ([#149])[#156]: https://github.com/rust-lang-nursery/bitflags/pull/156[#153]: https://github.com/rust-lang-nursery/bitflags/pull/153[#149]: https://github.com/rust-lang-nursery/bitflags/pull/149# 1.0.1- Add support for `pub(restricted)` specifier on the bitflags struct ([#135])- Optimize performance of `all()` when called from a separate crate ([#136])[#135]: https://github.com/rust-lang-nursery/bitflags/pull/135[#136]: https://github.com/rust-lang-nursery/bitflags/pull/136# 1.0.0- **[breaking change]** Macro now generates [associated constants](https://doc.rust-lang.org/reference/items.html#associated-constants) ([#24])- **[breaking change]** Minimum supported version is Rust **1.20**, due to usage of associated constants- After being broken in 0.9, the `#[deprecated]` attribute is now supported again ([#112])- Other improvements to unit tests and documentation ([#106] and [#115])[#24]: https://github.com/rust-lang-nursery/bitflags/pull/24[#106]: https://github.com/rust-lang-nursery/bitflags/pull/106[#112]: https://github.com/rust-lang-nursery/bitflags/pull/112[#115]: https://github.com/rust-lang-nursery/bitflags/pull/115## How to update your code to use associated constantsAssuming the following structure definition:```rustbitflags! {  struct Something: u8 {     const FOO = 0b01,     const BAR = 0b10  }}```In 0.9 and older you could do:```rustlet x = FOO.bits | BAR.bits;```Now you must use:```rustlet x = Something::FOO.bits | Something::BAR.bits;```# 0.9.1- Fix the implementation of `Formatting` traits when other formatting traits were present in scope ([#105])[#105]: https://github.com/rust-lang-nursery/bitflags/pull/105# 0.9.0- **[breaking change]** Use struct keyword instead of flags to define bitflag types ([#84])- **[breaking change]** Terminate const items with semicolons instead of commas ([#87])- Implement the `Hex`, `Octal`, and `Binary` formatting traits ([#86])- Printing an empty flag value with the `Debug` trait now prints "(empty)" instead of nothing ([#85])- The `bitflags!` macro can now be used inside of a fn body, to define a type local to that function ([#74])[#74]: https://github.com/rust-lang-nursery/bitflags/pull/74[#84]: https://github.com/rust-lang-nursery/bitflags/pull/84[#85]: https://github.com/rust-lang-nursery/bitflags/pull/85[#86]: https://github.com/rust-lang-nursery/bitflags/pull/86[#87]: https://github.com/rust-lang-nursery/bitflags/pull/87# 0.8.2- Update feature flag used when building bitflags as a dependency of the Rust toolchain# 0.8.1- Allow bitflags to be used as a dependency of the Rust toolchain# 0.8.0- Add support for the experimental `i128` and `u128` integer types ([#57])- Add set method: `flags.set(SOME_FLAG, true)` or `flags.set(SOME_FLAG, false)` ([#55])  This may break code that defines its own set method[#55]: https://github.com/rust-lang-nursery/bitflags/pull/55[#57]: https://github.com/rust-lang-nursery/bitflags/pull/57# 0.7.1*(yanked)*# 0.7.0- Implement the Extend trait ([#49])- Allow definitions inside the `bitflags!` macro to refer to items imported from other modules ([#51])[#49]: https://github.com/rust-lang-nursery/bitflags/pull/49[#51]: https://github.com/rust-lang-nursery/bitflags/pull/51# 0.6.0- The `no_std` feature was removed as it is now the default- The `assignment_operators` feature was remove as it is now enabled by default- Some clippy suggestions have been applied