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Updated RELEASES for 1.28.0
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Aaron Power
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RELEASES.md
138
RELEASES.md
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Version 1.28.0 (2018-08-02)
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===========================
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Language
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--------
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- [Stabilised the `#[repr(transparent)]` attribute.][51562] This attribute
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allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
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the inner type across Foreign Function Interface (FFI) boundaries.
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- [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
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and can now be used as identifiers.][51196]
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- [Stabilised the `GlobalAlloc` trait and `#[global_allocator]`
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attribute.][51241] This will allow users to specify a global allocator for
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their program.
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- [Unit test functions marked with the `#[test]` attribute can now return
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`Result<(), E: Debug>` in addition to `()`.][51298]
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- [Stabilised a `lifetime` specifier to `macro_rules!` allowing macros to easily
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target lifetimes.][50385]
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Compiler
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--------
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- [Stabilised the `s` and `z` optimisation levels.][50265] These optimisations
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prioritise making smaller binary sizes. `z` is the same as `s` with the
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exception that it does not vectorise loops, which typically results in an even
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smaller binary.
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- [Stabilised the short error format.][49546] Specified with
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`--error-format=short` this option will provide a more compressed output of
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rust error messages.
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- [Added a lint warning when you have duplicated `macro_export`s.][50143]
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- [Reduced the number of allocations in the macro parser.][50855] This can
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improve compile times of macro heavy crates on average by 5%.
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Libraries
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---------
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- [Implemented `Default` for `&mut str`.][51306]
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- [Implemented `From<bool>` for all integer and unsigned number types.][50554]
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- [Implemented `Extend` for `()`.][50234]
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- [The `Debug` implementation of `time::Duration` should now be more easily
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human readable.][50364] Previously a `Duration` of one second would printed as
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`Duration { secs: 1, nanos: 0 }` will now be printed as `1s`.
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- [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
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`From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
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for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
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`Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
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for `PathBuf`.][50170]
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- [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
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possible.][51050] This can provide up to a 40% speed increase.
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- [Improved error messages when using `format!`.][50610]
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Stabilized APIs
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---------------
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- [`Iterator::step_by`]
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- [`Path::ancestors`]
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- [`btree_map::Entry::or_default`]
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- [`fmt::Alignment`]
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- [`hash_map::Entry::or_default`]
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- [`iter::repeat_with`]
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- [`num::NonZeroU128`]
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- [`num::NonZeroU16`]
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- [`num::NonZeroU32`]
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- [`num::NonZeroU64`]
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- [`num::NonZeroU8`]
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- [`ops::RangeBounds`]
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- [`slice::SliceIndex`]
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- [`slice::from_mut`]
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- [`slice::from_ref`]
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- [`{Any + Send + Sync}::downcast_mut`]
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- [`{Any + Send + Sync}::downcast_ref`]
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- [`{Any + Send + Sync}::is`]
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Cargo
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-----
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- [Cargo will now no longer allow you to publish crates with build scripts that
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modify the `src` directory.][5584] The `src` directory in a crate should be
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considered to be immutable.
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Misc
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----
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- [Stabilised the `suggestion_applicability` field in the json output.][50486]
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This will allow dev tools to check whether a code suggestion would apply
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to them.
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Compatibility Notes
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-------------------
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- [Rust will no longer consider trait objects with duplicated constraints to
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have implementations.][51276] For example the below code will now fail
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to compile.
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```rust
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trait Trait {}
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impl Trait + Send {
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fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
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}
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impl Trait + Send + Send {
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fn test(&self) { println!("two"); }
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}
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```
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[49546]: https://github.com/rust-lang/rust/pull/49546/
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[50143]: https://github.com/rust-lang/rust/pull/50143/
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[50170]: https://github.com/rust-lang/rust/pull/50170/
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[50234]: https://github.com/rust-lang/rust/pull/50234/
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[50265]: https://github.com/rust-lang/rust/pull/50265/
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[50364]: https://github.com/rust-lang/rust/pull/50364/
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[50385]: https://github.com/rust-lang/rust/pull/50385/
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[50486]: https://github.com/rust-lang/rust/pull/50486/
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[50554]: https://github.com/rust-lang/rust/pull/50554/
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[50610]: https://github.com/rust-lang/rust/pull/50610/
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[50855]: https://github.com/rust-lang/rust/pull/50855/
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[51050]: https://github.com/rust-lang/rust/pull/51050/
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[51196]: https://github.com/rust-lang/rust/pull/51196/
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[51200]: https://github.com/rust-lang/rust/pull/51200/
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[51241]: https://github.com/rust-lang/rust/pull/51241/
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[51276]: https://github.com/rust-lang/rust/pull/51276/
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[51298]: https://github.com/rust-lang/rust/pull/51298/
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[51306]: https://github.com/rust-lang/rust/pull/51306/
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[51562]: https://github.com/rust-lang/rust/pull/51562/
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[5584]: https://github.com/rust-lang/cargo/pull/5584/
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[`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
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[`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
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[`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
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[`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
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[`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
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[`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
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[`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
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[`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
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[`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
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[`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
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[`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
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[`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
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[`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
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[`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
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[`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
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[`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
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[`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
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[`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
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Version 1.27.0 (2018-06-21)
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==========================
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