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Rollup merge of rust-lang#51722 - Aaronepower:master, r=Mark-Simulacrum
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Updated RELEASES for 1.28.0

[Rendered](https://github.com/Aaronepower/rust/blob/master/RELEASES.md)
r? @Mark-Simulacrum
cc @rust-lang/release
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Mark-Simulacrum authored Jul 10, 2018
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Version 1.28.0 (2018-08-02)
===========================

Language
--------
- [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
the inner type across Foreign Function Interface (FFI) boundaries.
- [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
and can now be used as identifiers.][51196]
- [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
stable.][51241] This will allow users to specify a global allocator for
their program.
- [Unit test functions marked with the `#[test]` attribute can now return
`Result<(), E: Debug>` in addition to `()`.][51298]
- [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
allows macros to easily target lifetimes.

Compiler
--------
- [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
prioritise making smaller binary sizes. `z` is the same as `s` with the
exception that it does not vectorise loops, which typically results in an even
smaller binary.
- [The short error format is now stable.][49546] Specified with
`--error-format=short` this option will provide a more compressed output of
rust error messages.
- [Added a lint warning when you have duplicated `macro_export`s.][50143]
- [Reduced the number of allocations in the macro parser.][50855] This can
improve compile times of macro heavy crates on average by 5%.

Libraries
---------
- [Implemented `Default` for `&mut str`.][51306]
- [Implemented `From<bool>` for all integer and unsigned number types.][50554]
- [Implemented `Extend` for `()`.][50234]
- [The `Debug` implementation of `time::Duration` should now be more easily
human readable.][50364] Previously a `Duration` of one second would printed as
`Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
- [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
`From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
`Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
for `PathBuf`.][50170]
- [Implemented `Shl` and `Shr` for `Wrapping<u128>`
and `Wrapping<i128>`.][50465]
- [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
possible.][51050] This can provide up to a 40% speed increase.
- [Improved error messages when using `format!`.][50610]

Stabilized APIs
---------------
- [`Iterator::step_by`]
- [`Path::ancestors`]
- [`btree_map::Entry::or_default`]
- [`fmt::Alignment`]
- [`hash_map::Entry::or_default`]
- [`iter::repeat_with`]
- [`num::NonZeroUsize`]
- [`num::NonZeroU128`]
- [`num::NonZeroU16`]
- [`num::NonZeroU32`]
- [`num::NonZeroU64`]
- [`num::NonZeroU8`]
- [`ops::RangeBounds`]
- [`slice::SliceIndex`]
- [`slice::from_mut`]
- [`slice::from_ref`]
- [`{Any + Send + Sync}::downcast_mut`]
- [`{Any + Send + Sync}::downcast_ref`]
- [`{Any + Send + Sync}::is`]

Cargo
-----
- [Cargo will now no longer allow you to publish crates with build scripts that
modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
considered to be immutable.

Misc
----
- [The `suggestion_applicability` field in `rustc`'s json output is now
stable.][50486] This will allow dev tools to check whether a code suggestion
would apply to them.

Compatibility Notes
-------------------
- [Rust will no longer consider trait objects with duplicated constraints to
have implementations.][51276] For example the below code will now fail
to compile.
```rust
trait Trait {}

impl Trait + Send {
fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
}

impl Trait + Send + Send {
fn test(&self) { println!("two"); }
}
```

[49546]: https://github.com/rust-lang/rust/pull/49546/
[50143]: https://github.com/rust-lang/rust/pull/50143/
[50170]: https://github.com/rust-lang/rust/pull/50170/
[50234]: https://github.com/rust-lang/rust/pull/50234/
[50265]: https://github.com/rust-lang/rust/pull/50265/
[50364]: https://github.com/rust-lang/rust/pull/50364/
[50385]: https://github.com/rust-lang/rust/pull/50385/
[50465]: https://github.com/rust-lang/rust/pull/50465/
[50486]: https://github.com/rust-lang/rust/pull/50486/
[50554]: https://github.com/rust-lang/rust/pull/50554/
[50610]: https://github.com/rust-lang/rust/pull/50610/
[50855]: https://github.com/rust-lang/rust/pull/50855/
[51050]: https://github.com/rust-lang/rust/pull/51050/
[51196]: https://github.com/rust-lang/rust/pull/51196/
[51200]: https://github.com/rust-lang/rust/pull/51200/
[51241]: https://github.com/rust-lang/rust/pull/51241/
[51276]: https://github.com/rust-lang/rust/pull/51276/
[51298]: https://github.com/rust-lang/rust/pull/51298/
[51306]: https://github.com/rust-lang/rust/pull/51306/
[51562]: https://github.com/rust-lang/rust/pull/51562/
[cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
[`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
[`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
[`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
[`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
[`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
[`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
[`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
[`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
[`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
[`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
[`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
[`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
[`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
[`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
[`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
[`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
[`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
[`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
[`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2


Version 1.27.0 (2018-06-21)
==========================

Expand Down Expand Up @@ -188,7 +331,7 @@ Language
- [Closures now implement `Copy` and/or `Clone` if all captured variables
implement either or both traits.][49299]
- [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
- [Stablise `'_`. The underscore lifetime can be used anywhere where a
- [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere where a
lifetime can be elided.][49458]
- [`impl Trait` is now stable allowing you to have abstract types in returns
or in function parameters.][49255] e.g. `fn foo() -> impl Iterator<Item=u8>` or
Expand Down Expand Up @@ -389,7 +532,7 @@ Version 1.25.0 (2018-03-29)

Language
--------
- [Stabilised `#[repr(align(x))]`.][47006] [RFC 1358]
- [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
- [You can now use nested groups of imports.][47948]
e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
- [You can now have `|` at the start of a match arm.][47947] e.g.
Expand Down

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