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Updated RELEASES.md for 1.38.0 #64283

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Version 1.38.0 (2019-09-26)
==========================

Language
--------
- [The `#[global_allocator]` attribute can now be used in submodules.][62735]
- [The `#[deprecated]` attribute can now be used on macros.][62042]

Compiler
--------
- [Added pipelined compilation support to `rustc`.][62766] This will
improve compilation times in some cases. For further information please refer
to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
- [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
`i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
`x86_64-uwp-windows-msvc` targets.][60260]
- [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
`armv7-unknown-linux-musleabi` targets.][63107]
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@Mark-Simulacrum

Mark-Simulacrum Sep 8, 2019

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We should note that these are tier 3 (I believe, not sure) targets here to give appropriate expectations for end-users.

- [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
- [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]

\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.

Libraries
---------
- [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
- [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
is available at `std::clone::Clone`). This also makes all built-in macros
available in `std`/`core` root. e.g. `std::include_bytes!`.
- [`str::Chars` now implements `Debug`.][63000]
- [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
- [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
- [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
- [Added euclidean remainder and division operations (`div_euclid`,
`rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
`overflowing`, and `wrapping` versions are available for all
integer primitives.
- [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
`PartialEq`.][61491]
- [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]

Stabilized APIs
---------------
- [`<*const T>::cast`]
- [`<*mut T>::cast`]
- [`Duration::as_secs_f32`]
- [`Duration::as_secs_f64`]
- [`Duration::div_duration_f32`]
- [`Duration::div_duration_f64`]
- [`Duration::div_f32`]
- [`Duration::div_f64`]
- [`Duration::from_secs_f32`]
- [`Duration::from_secs_f64`]
- [`Duration::mul_f32`]
- [`Duration::mul_f64`]
- [`any::type_name`]
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@killercup

killercup Sep 8, 2019

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link missing, ref link name is [`intrinsics::type_name`]


Cargo
-----
- [Added pipelined compilation support to `cargo`.][cargo/7143]
- [You can now pass the `--features` option multiple times to enable
multiple features.][cargo/7084]

Misc
----
- [`rustc` will now warn about some incorrect uses of
`mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]

[60260]: https://github.com/rust-lang/rust/pull/60260/
[61457]: https://github.com/rust-lang/rust/pull/61457/
[61491]: https://github.com/rust-lang/rust/pull/61491/
[61884]: https://github.com/rust-lang/rust/pull/61884/
[61953]: https://github.com/rust-lang/rust/pull/61953/
[62042]: https://github.com/rust-lang/rust/pull/62042/
[62528]: https://github.com/rust-lang/rust/pull/62528/
[62583]: https://github.com/rust-lang/rust/pull/62583/
[62735]: https://github.com/rust-lang/rust/pull/62735/
[62766]: https://github.com/rust-lang/rust/pull/62766/
[62784]: https://github.com/rust-lang/rust/pull/62784/
[62814]: https://github.com/rust-lang/rust/pull/62814/
[63000]: https://github.com/rust-lang/rust/pull/63000/
[63056]: https://github.com/rust-lang/rust/pull/63056/
[63107]: https://github.com/rust-lang/rust/pull/63107/
[63346]: https://github.com/rust-lang/rust/pull/63346/
[63421]: https://github.com/rust-lang/rust/pull/63421/
[cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
[cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
[`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
[`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
[`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
[`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
[`Duration::div_duration_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_duration_f32
[`Duration::div_duration_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_duration_f64
[`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
[`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
[`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
[`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
[`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
[`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
[`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
[forge-platform-support]: https://forge.rust-lang.org/platform-support.html
[pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199

Version 1.37.0 (2019-08-15)
==========================

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