Updated RELEASES.md for 1.33.0
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Aaron Power
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RELEASES.md
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RELEASES.md
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Version 1.33.0 (2019-02-28)
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==========================
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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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- [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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}
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fn main() {
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let state = Creature::Crab("Ferrous");
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if let Creature::Crab(name) | Creature::Person(name) {
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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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this feature will by default produce a warning as this behaviour can be
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unintuitive. E.g. `if let _ = 5 {}`
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- [You can now use `let` bindings and pattern destructurcting in
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constant 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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```rust
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unsafe const 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 import an item from a module as a `_`.][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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use std::io::Read as _;
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// Allowed as there is only one `Read` in the module.
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pub trait Read {}
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```
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- [`extern` functions will now abort by default when panicking.][55982]
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Compiler
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--------
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- [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
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command line argument.][56351]
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- [The mininum required LLVM version has been bumped to 6.0.][56642]
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- [Added support for the PowerPC64 architecture on FreeBSD.][57615]
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- [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
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tier 2 support.][57130] Visit the [platform support] page for information on
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Rust's platform support.
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- [Added support for the `thumbv7neon-linux-androideabi` and
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`thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
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- [Added support for the `x86_64-unknown-uefi` target.][56769]
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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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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 `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
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`swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now constant for all
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numeric types.][57234]
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- [`Ipv4Addr::new` is now a constant function][57234]
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Stabilized APIs
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---------------
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- [`unix::FileExt::read_exact_at`]
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- [`unix::FileExt::write_exact_at`]
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- [`Option::transpose`]
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- [`Result::transpose`]
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- [`convert::identity`]
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- [`pin::Pin`]
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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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[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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[57532]: https://github.com/rust-lang/rust/pull/57532/
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[57535]: https://github.com/rust-lang/rust/pull/57535/
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[57566]: https://github.com/rust-lang/rust/pull/57566/
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[57130]: https://github.com/rust-lang/rust/pull/57130/
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[57167]: https://github.com/rust-lang/rust/pull/57167/
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[57175]: https://github.com/rust-lang/rust/pull/57175/
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[57234]: https://github.com/rust-lang/rust/pull/57234/
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[57332]: https://github.com/rust-lang/rust/pull/57332/
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[56947]: https://github.com/rust-lang/rust/pull/56947/
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[57049]: https://github.com/rust-lang/rust/pull/57049/
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[57067]: https://github.com/rust-lang/rust/pull/57067/
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[56769]: https://github.com/rust-lang/rust/pull/56769/
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[56642]: https://github.com/rust-lang/rust/pull/56642/
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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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[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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[`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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Version 1.32.0 (2019-01-17)
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==========================
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