Update RELEASES.md
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Aaron Power
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RELEASES.md
69
RELEASES.md
@ -5,21 +5,25 @@ Language
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--------
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- [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
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`#[cfg(target_vendor="linux")] fn main() { println!("Hello Linux!"); }`
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- [Integer patterns such as in a match expression can now be exhaustive.][56362]
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E.g. You can have match statement on a `u8` that covers `0..=255` and
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you would no longer be required to have a `_ => unreachable!()` case.
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- [You can now have multiple patterns in `if let` and `while let`
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expressions.][57532] You can do this with the same syntax as a `match`
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expression. E.g.
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```rust
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enum Creature {
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Crab(String),
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Person(String),
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Crab(String),
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Lobster(String),
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Person(String),
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}
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fn main() {
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let state = Creature::Crab("Ferris");
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let state = Creature::Crab("Ferris");
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if let Creature::Crab(name) | Creature::Person(name) = state {
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println!("This creature's name is: {}", name);
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}
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if let Creature::Crab(name) | Creature::Person(name) = state {
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println!("This creature's name is: {}", name);
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}
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}
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```
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- [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
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@ -27,18 +31,18 @@ Language
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unintuitive. E.g. `if let _ = 5 {}`
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- [You can now use `let` bindings, assignments, expression statements, and pattern destructuring in
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const functions.][57175]
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- [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
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E.g. `#[cfg_attr(all(), must_use, optimize)]`
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- [You can now specify a specific alignment with the `#[repr(packed)]`
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attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
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with an alignment of 2 bytes and a size of 6 bytes.
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- [You can now call unsafe constant functions.][57067] E.g.
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- [You can now call unsafe const functions.][57067] E.g.
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```rust
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const unsafe fn foo() -> i32 { 5 }
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const fn bar() -> i32 {
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unsafe { foo() }
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}
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```
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- [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
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E.g. `#[cfg_attr(all(), must_use, optimize)]`
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- [You can now specify a specific alignment with the `#[repr(packed)]`
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attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
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with an alignment of 2 bytes and a size of 6 bytes.
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- [You can now import an item from a module as an `_`.][56303] This allows you to
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import a trait's impls, and not have the name in the namespace. E.g.
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```rust
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@ -64,13 +68,17 @@ Compiler
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Libraries
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---------
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- [The functions `overflowing_{add, sub, mul, shl, shr}` are now constant
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- [The functions `overflowing_{add, sub, mul, shl, shr}` are now `const`
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functions for all numeric types.][57566]
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- [The `get` method for all `NonZero` types is now constant.][57167]
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- [The functions `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
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are now `const` functions for all numeric types.][57105]
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- [The functions `is_positive` and `is_negative` are now `const` functions for
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all signed numeric types.][57105]
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- [The `get` method for all `NonZero` types is now `const`.][57167]
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- [The functions `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
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`swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now const for all
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`swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
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numeric types.][57234]
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- [`Ipv4Addr::new` is now a const function][57234]
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- [`Ipv4Addr::new` is now a `const` function][57234]
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Stabilized APIs
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---------------
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@ -80,17 +88,25 @@ Stabilized APIs
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- [`Result::transpose`]
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- [`convert::identity`]
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- [`pin::Pin`]
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- [`marker::Unpin`]
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- [`marker::PhantomPinned`]
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- [`Vec::resize_with`]
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- [`VecDeque::resize_with`]
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- [`Duration::as_millis`]
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- [`Duration::as_micros`]
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- [`Duration::as_nanos`]
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Cargo
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-----
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- [Cargo should now rebuild a crate if a file was modified during the initial
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build.][cargo/6484]
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Compatibility Notes
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-------------------
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- The functions `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
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are now offically deprecated, and their usage will now produce a warning. Please use the
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`str::{trim_start, trim_end, trim_start_matches, trim_end_matches}` functions instead.
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[57615]: https://github.com/rust-lang/rust/pull/57615/
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[57465]: https://github.com/rust-lang/rust/pull/57465/
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@ -110,18 +126,21 @@ Cargo
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[56303]: https://github.com/rust-lang/rust/pull/56303/
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[56351]: https://github.com/rust-lang/rust/pull/56351/
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[55982]: https://github.com/rust-lang/rust/pull/55982/
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[57105]: https://github.com/rust-lang/rust/pull/57105
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[cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
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[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#read_exact_at
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[`unix::FileExt::write_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#write_exact_at
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[`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#transpose
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[`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#transpose
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[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
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[`unix::FileExt::write_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_exact_at
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[`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
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[`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
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[`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
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[`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
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[`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#resize_with
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[`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#resize_with
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[`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_millis
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[`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_micros
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[`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_millis
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[`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
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[`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
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[`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
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[`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
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[`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
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[`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
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[`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
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[platform-support]: https://forge.rust-lang.org/platform-support.html
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Version 1.32.0 (2019-01-17)
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