Hello and welcome to another issue of This Week in Rust! Rust is a systems language pursuing the trifecta: safe, concurrent, and fast. This is a weekly summary of its progress and community. Want something mentioned? Send me an email! Want to get involved? We love contributions.

What's cooking on master?

66 pull requests were merged this week.

Breaking Changes

• mem::uninit has been renamed to uninitialized, and everything in mem is either stable or deprecated (to be removed). There are a bunch of other changes to mem that go with this.
• All uses of ~str have been removed.
• UnsafeArc has been removed, replaced with Arc<Unsafe<T>>.
• Rng.choose now returns an Option.
• Bitv::init_to_vec has been removed.
• Test shards with the built-in test runner are now indexed by 1 in the CLI.
• Result.unwrap_or_handle has been renamed to unwrap_or_else for consistency with Option.
• Some miscellaneous renames in libcollections.
• rustc is more strict about where it will accept a given mod foo; statement.

Other Changes

There were a lot of various bugfixes and documentation additions all around.

• There is now support for weak failure.
• The docs for the cell types has been massively improved.
• bytes!() now properly returns a static slice.
• A liballoc has materialized, that contains all allocation support

New Contributors

• Anton Löfgren
• Jihyeok Seo
• Jonathan Bailey
• Michael Dagitses
• P1start
• TyOverby
• Valerii Hiora

RFCs

• Allow the unsafe qualifier on struct fields
• Guaranteed tail-call optimization
• Add syntax to partially destructure self in method signatures
• Generalize macro_registar to plugin_registrar
• Bounds on trait objects should be separated with +
• Macro syntax to count sequence repetitions
• Loadable lints
• Lexer syntax simplification

Community Updates

• Guaranteeing Memory Safety in Rust (a talk by Niko)
• Approaches to resource disposal
• Introducing js.rs
• Practicality with Rust: Setting Up A Project
• Burn, a programming language implemented in Rust
• Rust for C++ programmers - part 7: data types
• cxx2rust: the pains of wrapping C++ in Rust on the example of Qt5
• Add a new language design faq
• rspt: a physically based renderer