1.25 announcement

_posts/2018-03-29-Rust-1.25.md

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+---
+layout: post
+title: "Announcing Rust 1.25"
+author: The Rust Core Team
+---
+
+The Rust team is happy to announce a new version of Rust, 1.25.0. Rust is a
+systems programming language focused on safety, speed, and concurrency.
+
+If you have a previous version of Rust installed via rustup, getting Rust
+1.25.0 is as easy as:
+
+```bash
+$ rustup update stable
+```
+
+If you don't have it already, you can [get `rustup`][install] from the
+appropriate page on our website, and check out the [detailed release notes for
+1.25.0][notes] on GitHub.
+
+[install]: https://www.rust-lang.org/install.html
+[notes]: https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1250-2018-03-29
+
+## What's in 1.25.0 stable
+
+Rust 1.25 contains a bunch of stuff! The first one is straightforward: we've
+[upgraded to LLVM 6] from LLVM 4. This has a number of effects, a major one
+being a step closer to AVR support.
+
+A new way to write `use` statements has landed: [nested import groups]. If you've
+ever written a set of imports like this:
+
+```rust
+use std::fs::File;
+use std::io::Read;
+use std::path::{Path, PathBuf};
+```
+
+You can now write this:
+
+```rust
+// on one line
+use std::{fs::File, io::Read, path::{Path, PathBuf}};
+
+// with some more breathing room
+use std::{
+    fs::File,
+    io::Read,
+    path::{
+        Path,
+        PathBuf
+    }
+};
+```
+
+This can reduce some repetition, and make things a bit more clear.
+
+There are two big documentation changes in this release: first, [Rust By
+Example is now included on doc.rust-lang.org]! We'll be redirecing the old
+domain there shortly. We hope this will bring more attention to a great
+resource, and you'll get a local copy with your local documentation.
+
+Second, back in Rust 1.23, we talked about the change from Hoedown to
+pulldown-cmark. In Rust 1.25, pulldown-cmark is now the default rendering.
+After years, we have finally removed the last bit of C from rustdoc, and
+properly follow the CommonMark spec.
+
+Finally, in [RFC 1358], `#[repr(align(x))]` was accepted. In Rust
+1.25, [it is now stable]! This attribute lets you set the [alignment]
+of your `struct`s:
+
+```rust
+struct NotAligned(i32);
+
+assert_eq!(std::mem::align_of::<NotAligned>(), 4);
+assert_eq!(std::mem::size_of::<NotAligned>(), 4);
+
+#[repr(align(16))]
+struct Align16(i32);
+
+assert_eq!(std::mem::align_of::<Align16>(), 16);
+assert_eq!(std::mem::size_of::<Align16>(), 16);
+```
+
+If you're working with low-level stuff, control of these kinds of things
+can be very important!
+
+[upgraded to LLVM 6]: https://github.com/rust-lang/rust/pull/47828
+[nested import groups]: https://github.com/rust-lang/rust/pull/47948
+[Rust By Example is now included on doc.rust-lang.org]: https://doc.rust-lang.org/rust-by-example/
+[RFC 1358]: https://github.com/rust-lang/rfcs/blob/master/text/1358-repr-align.md
+[it is now stable]: https://github.com/rust-lang/rust/pull/47006
+[alignment]: https://en.wikipedia.org/wiki/Data_structure_alignment
+
+
+See the [detailed release notes][notes] for more.
+
+### Library stabilizations
+
+
+Additionally, a few new APIs were stabilized this release:
+
+* [] ()
+
+See the [detailed release notes][notes] for more.
+
+### Cargo features
+
+
+See the [detailed release notes][notes] for more.
+
+## Contributors to 1.25.0
+
+Many people came together to create Rust 1.25. We couldn't have done it
+without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.25.0)