Welcome to another issue of This Week in Rust! This week marks the addition of some more feature gates, removal of std::io, and some feature proposals.

What's cooking on master?

47 PRs were merged this week, and we passed issue number 10000.

Breaking Changes

• Most of the crypto in the stdlib has been removed.
• std::io has been removed, with corresponding improvements in std::rt::io.
• The frame_address intrinsic has been removed.
• @-ptrs are now feature-gated, reflecting the fact that they will exist in a very different form once they are finished.
• All of the logging that used fmt (debug! and so forth) have been transitioned to format!.
• asm! is also featured gated.
• sys::log_str has moved.

Other changes

• The long-awaited addition of mut in patterns has finally happened. let (mut x, y) = (1, 2); works.
• The scheduler now uses lock free data structures, which are supposed to perform much better.
• The homing code now does less work, which does one third as many write's.
• stdout is now buffered.
• A non-libuv event loop has been added.
• std::rand has seen more work.
• rustpkg now supports arbitrary dependencies, such as C libraries.
• mut is now allowed on self.
• Nested comments are now allowed.
• rustpkg will now [find crates in the current directory], so you can say rustpkg build in a source dir and it will build in a workspace.
• Some new float intrinsics have been exposed.
• println! allocates less.

New contributors

• Igor Bukanov
• Mark Rowe
• Michael Letterle
• reedlepee

Announcements etc

• There will be a meetup in the San Fransisco Mozilla office. Patrick Walton will be talking about sprocketnes. If you're in the area, you should definitely go!
• rust-ci has been created, which lets you have travis automatically rebuild and test your repo daily, to reduce language/library breakage.
• rust-mustache and rust-zmq have been updated for master.
• Short talk about Rust at Scala.IO in Paris (October 25th).
• A Bit of Functional Programming in Rust, or A Misguided First Look at Rust for ML Programmers.
• A draft proposal for single inheritance.
• Iterators yielding mutable references.
• Servo transitions from libcss to a new CSS library written in Rust.
• On stack safety.