Rollup merge of #66377 - XAMPPRocky:relnotes-1.40.0, r=Mark-Simulacrum
Update RELEASES.md for 1.40.0 ### [Rendered](https://github.com/XAMPPRocky/rust/blob/relnotes-1.40.0/RELEASES.md) r? @Mark-Simulacrum cc @rust-lang/release
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Yuki Okushi
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RELEASES.md
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RELEASES.md
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Version 1.40.0 (2019-12-19)
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===========================
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Language
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--------
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- [You can now use tuple `struct`s and tuple `enum` variant's constructors in
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`const` contexts.][65188] e.g.
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```rust
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pub struct Point(i32, i32);
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const ORIGIN: Point = {
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let constructor = Point;
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constructor(0, 0)
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};
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```
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- [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
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indicate that there may be variants or fields added in the future.][64639]
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For example this requires adding a wild-card branch (`_ => {}`) to any match
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statements on a non-exhaustive `enum`. [(RFC 2008)]
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- [You can now use function-like procedural macros in `extern` blocks and in
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type positions.][63931] e.g. `type Generated = macro!();`
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- [Function-like and attribute procedural macros can now emit
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`macro_rules!` items, so you can now have your macros generate macros.][64035]
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- [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
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attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
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`#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
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Compiler
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--------
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- [Added tier 3 support\* for the
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`thumbv7neon-unknown-linux-musleabihf` target.][66103]
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- [Added tier 3 support for the
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`aarch64-unknown-none-softfloat` target.][64589]
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- [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
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`mips64el-unknown-linux-muslabi64` targets.][65843]
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\* Refer to Rust's [platform support page][forge-platform-support] for more
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information on Rust's tiered platform support.
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Libraries
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---------
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- [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
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Stabilized APIs
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---------------
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- [`BTreeMap::get_key_value`]
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- [`HashMap::get_key_value`]
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- [`Option::as_deref_mut`]
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- [`Option::as_deref`]
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- [`Option::flatten`]
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- [`UdpSocket::peer_addr`]
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- [`f32::to_be_bytes`]
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- [`f32::to_le_bytes`]
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- [`f32::to_ne_bytes`]
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- [`f64::to_be_bytes`]
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- [`f64::to_le_bytes`]
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- [`f64::to_ne_bytes`]
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- [`f32::from_be_bytes`]
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- [`f32::from_le_bytes`]
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- [`f32::from_ne_bytes`]
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- [`f64::from_be_bytes`]
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- [`f64::from_le_bytes`]
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- [`f64::from_ne_bytes`]
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- [`mem::take`]
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- [`slice::repeat`]
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- [`todo!`]
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Cargo
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-----
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- [Cargo will now always display warnings, rather than only on
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fresh builds.][cargo/7450]
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- [Feature flags (except `--all-features`) passed to a virtual workspace will
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now produce an error.][cargo/7507] Previously these flags were ignored.
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- [You can now publish `dev-dependencies` without including
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a `version`.][cargo/7333]
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Misc
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----
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- [You can now specify the `#[cfg(doctest)]` attribute to include an item only
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when running documentation tests with `rustdoc`.][63803]
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Compatibility Notes
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-------------------
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- [As previously announced, any previous NLL warnings in the 2015 edition are
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now hard errors.][64221]
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- [The `include!` macro will now warn if it failed to include the
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entire file.][64284] The `include!` macro unintentionally only includes the
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first _expression_ in a file, and this can be unintuitive. This will become
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either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
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- [Using `#[inline]` on function prototypes and consts now emits a warning under
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`unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
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or `extern` blocks now correctly emits a hard error.
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[65294]: https://github.com/rust-lang/rust/pull/65294/
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[66103]: https://github.com/rust-lang/rust/pull/66103/
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[65843]: https://github.com/rust-lang/rust/pull/65843/
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[65188]: https://github.com/rust-lang/rust/pull/65188/
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[65092]: https://github.com/rust-lang/rust/pull/65092/
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[64589]: https://github.com/rust-lang/rust/pull/64589/
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[64639]: https://github.com/rust-lang/rust/pull/64639/
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[64221]: https://github.com/rust-lang/rust/pull/64221/
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[64284]: https://github.com/rust-lang/rust/pull/64284/
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[63931]: https://github.com/rust-lang/rust/pull/63931/
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[64035]: https://github.com/rust-lang/rust/pull/64035/
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[63674]: https://github.com/rust-lang/rust/pull/63674/
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[63803]: https://github.com/rust-lang/rust/pull/63803/
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[cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
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[cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
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[cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
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[cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
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[(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
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[`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
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[`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
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[`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
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[`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
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[`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
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[`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
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[`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
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[`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
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[`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
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[`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
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[`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
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[`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
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[`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
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[`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
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[`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
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[`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
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[`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
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[`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
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[`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
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[`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
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[`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
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Version 1.39.0 (2019-11-07)
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===========================
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