Rust 1.25.0

Language

--------

- [The #[repr(align(x))] attribute is now stable.][47006] [RFC 1358]

- [You can now use nested groups of imports.][47948]

e.g. use std::{fs::File, io::Read, path::{Path, PathBuf}};

- [You can now have | at the start of a match arm.][47947] e.g.

enum Foo { A, B, C }
fn main() {
let x = Foo::A;
match x {
| Foo::A
| Foo::B => println!("AB"),
| Foo::C => println!("C"),
}
}

Compiler

--------

- [Upgraded to LLVM 6.][47828]

- [Added -C lto=val option.][47521]

- [Added i586-unknown-linux-musl target][47282]

Libraries

---------

- [Impl Send for process::Command on Unix.][47760]

- [Impl PartialEq and Eq for ParseCharError.][47790]

- [UnsafeCell::into_inner is now safe.][47204]

- [Implement libstd for CloudABI.][47268]

- [Float::{from_bits, to_bits} is now available in libcore.][46931]

- [Implement AsRef for Component][46985]

- [Implemented Write for Cursor<&mut Vec>][46830]

- [Moved Duration to libcore.][46666]

Stabilized APIs

---------------

- [Location::column]

- [ptr::NonNull]

The following functions can now be used in a constant expression.

eg. static MINUTE: Duration = Duration::from_secs(60);

- [Duration::new][47300]

- [Duration::from_secs][47300]

- [Duration::from_millis][47300]

Cargo

-----

- [cargo new no longer removes rust or rs prefixes/suffixes.][cargo/5013]

- [cargo new now defaults to creating a binary crate, instead of a

library crate.][cargo/5029]

Misc

----

- [Rust by example is now shipped with new releases][46196]

Compatibility Notes

-------------------

- [Deprecated net::lookup_host.][47510]

- [rustdoc has switched to pulldown as the default markdown renderer.][47398]

- The borrow checker was sometimes incorrectly permitting overlapping borrows

around indexing operations (see [#47349][47349]). This has been fixed (which also

enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).

- [Removed deprecated unstable attribute #[simd].][47251]

[33903]: https://github.com/rust-lang/rust/pull/33903

[47947]: https://github.com/rust-lang/rust/pull/47947

[47948]: https://github.com/rust-lang/rust/pull/47948

[47760]: https://github.com/rust-lang/rust/pull/47760

[47790]: https://github.com/rust-lang/rust/pull/47790

[47828]: https://github.com/rust-lang/rust/pull/47828

[47398]: https://github.com/rust-lang/rust/pull/47398

[47510]: https://github.com/rust-lang/rust/pull/47510

[47521]: https://github.com/rust-lang/rust/pull/47521

[47204]: https://github.com/rust-lang/rust/pull/47204

[47251]: https://github.com/rust-lang/rust/pull/47251

[47268]: https://github.com/rust-lang/rust/pull/47268

[47282]: https://github.com/rust-lang/rust/pull/47282

[47300]: https://github.com/rust-lang/rust/pull/47300

[47349]: https://github.com/rust-lang/rust/pull/47349

[46931]: https://github.com/rust-lang/rust/pull/46931

[46985]: https://github.com/rust-lang/rust/pull/46985

[47006]: https://github.com/rust-lang/rust/pull/47006

[46830]: https://github.com/rust-lang/rust/pull/46830

[46095]: https://github.com/rust-lang/rust/pull/46095

[46666]: https://github.com/rust-lang/rust/pull/46666

[46196]: https://github.com/rust-lang/rust/pull/46196

[cargo/5013]: https://github.com/rust-lang/cargo/pull/5013

[cargo/5029]: https://github.com/rust-lang/cargo/pull/5029

[RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358

[Location::column]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column

[ptr::NonNull]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html