Commit 50be4794 authored by Aaron Power's avatar Aaron Power

Updated RELEASES.md for 1.33.0

parent b139669f
Version 1.33.0 (2019-02-28)
==========================
Language
--------
- [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
`#[cfg(target_vendor="linux")] fn main() { println!("Hello Linux!"); }`
- [You can now have multiple patterns in `if let` and `while let`
expressions.][57532] You can do this with the same syntax as a `match`
expression. E.g.
```rust
enum Creature {
Crab(String),
Person(String),
}
fn main() {
let state = Creature::Crab("Ferrous");
if let Creature::Crab(name) | Creature::Person(name) {
println!("This creature's name is: {}", name);
}
}
```
- [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
this feature will by default produce a warning as this behaviour can be
unintuitive. E.g. `if let _ = 5 {}`
- [You can now use `let` bindings and pattern destructurcting in
constant functions.][57175]
- [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
E.g. `#[cfg_attr(all(), must_use, optimize)]`
- [You can now specify a specific alignment with the `#[repr(packed)]`
attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
with an alignment of 2 bytes and a size of 6 bytes.
- [You can now call unsafe constant functions.][57067] E.g.
```rust
unsafe const fn foo() -> i32 { 5 }
const fn bar() -> i32 {
unsafe { foo() }
}
```
- [You can now import an item from a module as a `_`.][56303] This allows you to
import a trait's impls, and not have the name in the namespace. E.g.
```rust
use std::io::Read as _;
// Allowed as there is only one `Read` in the module.
pub trait Read {}
```
- [`extern` functions will now abort by default when panicking.][55982]
Compiler
--------
- [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
command line argument.][56351]
- [The mininum required LLVM version has been bumped to 6.0.][56642]
- [Added support for the PowerPC64 architecture on FreeBSD.][57615]
- [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
tier 2 support.][57130] Visit the [platform support] page for information on
Rust's platform support.
- [Added support for the `thumbv7neon-linux-androideabi` and
`thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
- [Added support for the `x86_64-unknown-uefi` target.][56769]
Libraries
---------
- [The functions `overflowing_{add, sub, mul, shl, shr}` are now constant
functions for all numeric types.][57566]
- [The `get` method for all `NonZero` types is now constant.][57167]
- [The functions `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
`swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now constant for all
numeric types.][57234]
- [`Ipv4Addr::new` is now a constant function][57234]
Stabilized APIs
---------------
- [`unix::FileExt::read_exact_at`]
- [`unix::FileExt::write_exact_at`]
- [`Option::transpose`]
- [`Result::transpose`]
- [`convert::identity`]
- [`pin::Pin`]
- [`Vec::resize_with`]
- [`VecDeque::resize_with`]
- [`Duration::as_millis`]
- [`Duration::as_micros`]
- [`Duration::as_nanos`]
Cargo
-----
- [Cargo should now rebuild a crate if a file was modified during the initial
build.][cargo/6484]
[57615]: https://github.com/rust-lang/rust/pull/57615/
[57465]: https://github.com/rust-lang/rust/pull/57465/
[57532]: https://github.com/rust-lang/rust/pull/57532/
[57535]: https://github.com/rust-lang/rust/pull/57535/
[57566]: https://github.com/rust-lang/rust/pull/57566/
[57130]: https://github.com/rust-lang/rust/pull/57130/
[57167]: https://github.com/rust-lang/rust/pull/57167/
[57175]: https://github.com/rust-lang/rust/pull/57175/
[57234]: https://github.com/rust-lang/rust/pull/57234/
[57332]: https://github.com/rust-lang/rust/pull/57332/
[56947]: https://github.com/rust-lang/rust/pull/56947/
[57049]: https://github.com/rust-lang/rust/pull/57049/
[57067]: https://github.com/rust-lang/rust/pull/57067/
[56769]: https://github.com/rust-lang/rust/pull/56769/
[56642]: https://github.com/rust-lang/rust/pull/56642/
[56303]: https://github.com/rust-lang/rust/pull/56303/
[56351]: https://github.com/rust-lang/rust/pull/56351/
[55982]: https://github.com/rust-lang/rust/pull/55982/
[cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#read_exact_at
[`unix::FileExt::write_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#write_exact_at
[`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#transpose
[`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#transpose
[`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
[`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
[`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#resize_with
[`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#resize_with
[`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_millis
[`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_micros
[`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_millis
Version 1.32.0 (2019-01-17)
==========================
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