Version 1.31.1 (2018-12-20)

Version 1.31.0 (2018-12-06)

Language

🎉 This version marks the release of the 2018 edition of Rust. 🎉
New lifetime elision rules now allow for eliding lifetimes in functions and impl headers. E.g. impl<'a> Reader for BufReader<'a> {} can now be impl Reader for BufReader<'_> {}. Lifetimes are still required to be defined in structs.
You can now define and use const functions. These are currently a strict minimal subset of the const fn RFC. Refer to the language reference for what exactly is available.
You can now use tool lints, which allow you to scope lints from external tools using attributes. E.g. #[allow(clippy::filter_map)].
#[no_mangle] and #[export_name] attributes can now be located anywhere in a crate, not just in exported functions.
You can now use parentheses in pattern matches.

Compiler

Updated musl to 1.1.20

Libraries

You can now convert num::NonZero* types to their raw equivalents using the From trait. E.g. u8 now implements From<NonZeroU8>.
You can now convert a &Option<T> into Option<&T> and &mut Option<T> into Option<&mut T> using the From trait.
You can now multiply (*) a time::Duration by a u32.

Stabilized APIs

Cargo