Hello and welcome to another issue of This Week in Rust! Rust is a systems language pursuing the trifecta: safety, concurrency, and speed. This is a weekly summary of its progress and community. Want something mentioned? Tweet us at @ThisWeekInRust or send us a pull request. Want to get involved? We love contributions.

This Week in Rust is openly developed on GitHub. If you find any errors in this week's issue, please submit a PR.

Updates from Rust Community

News & Blog Posts

• How often does Rust change?
• The differences between Ok-wrapping, try blocks, and function level try.
• Mental models around Ok-wrapping.
• The problem of effects in Rust.
• Library-ification and analyzing Rust.
• A possible new backend for Rust.
• Simple but powerful Pratt parsing.
• Ruma is dead, long live Ruma.
• Programming Servo: My own private runtime.
• Hyper traps.
• Downloading all the crates on crates.io.
• Kubernetes: A Rusty Friendship.
• Fallible Iterator Adapters.
• Types over strings: Extensible architectures in Rust.
• [pdf] LLHD: Rust is used to drive research in Hardware Design Languages.
• rust-analyzer changelog 20.
• IntelliJ Rust changelog 120.
• New sysinfo release: processes disk usage.
• April lang team design meetings.

Crate of the Week

This week's crate is sudo, a library to let your program run as root.

Thanks to Stefan Schindler for the suggestion!

Submit your suggestions and votes for next week!

Call for Participation

Always wanted to contribute to open-source projects but didn't know where to start? Every week we highlight some tasks from the Rust community for you to pick and get started!

Some of these tasks may also have mentors available, visit the task page for more information.

• tree-buf: Floating point compression. Tree-buf is an experimental serialization system written in Rust.

If you are a Rust project owner and are looking for contributors, please submit tasks here.

Updates from Rust Core

367 pull requests were merged in the last week

• support #[track_caller] on functions in extern "Rust" { ... }
• handle impl Trait where Trait has an assoc type with missing bounds
• normalize function signature in function casting check procedure
• do not lose or reorder user-provided linker arguments
• suggest move for closures and async blocks in more cases
• remove false positives of unused_braces
• use a SmallVec for Cache::predecessors
• speed up path searching with find_library_crate
• allocate some query results on an arena
• add io::Write::write_all_vectored
• detailed panic messages for Vec functions
• small tweaks in ToOwned::clone_into
• remove the Ord bound that was plaguing drain_filter
• match options directly in the Fuse implementation
• implement Chain with Option fuses
• rearrange BTreeMap::into_iter to match range_mut
• BTreeMap first last proposal tweaks
• add or_insert_with_key to Entry of HashMap/BTreeMap
• hashbrown: add or_insert_with_key to Entry of HashMap
• arch: add more ARM SIMD intrinsics
• cargo: add cargo tree command

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

No RFCs were approved this week.

Final Comment Period

Every week the team announces the 'final comment period' for RFCs and key PRs which are reaching a decision. Express your opinions now.

RFCs

• [disposition: merge] Unsafe blocks in unsafe fn.

Tracking Issues & PRs

• [disposition: merge] Resolving Ok-wrapping for try blocks.
• [disposition: merge] Stabilize Span::mixed_site.
• [disposition: merge] Stabilize most common subset of alloc_layout_extras.
• [disposition: merge] Tracking issue for PathBuf capacity methods.
• [disposition: merge] Add Option to Force Unwind Tables.
• [disposition: merge] Move LLVM bitcode destination.
• [disposition: merge] A big options clean-up.
• [disposition: merge] Stabilize UNICODE_VERSION (feature unicode_version).

New RFCs

• Deduplicate Cargo workspace information.
• Major change proposal process for compiler team.

Upcoming Events

Online

• Apr 23. Turin, IT - Rust Turin online meetup.

Europe

• Apr 30. Berlin, DE - OpenTechSchool Berlin - Rust Hack and Learn.

North America

• Apr 22. Ann Arbor, MI, US - Ann Arbor Rust Meetup - Monthly Gathering.
• Apr 27. Durham, NC, US - Triangle Rustaceans - Project Night & Lightning Talks.
• Apr 28. Dallas, TX, US - Dallas Rust - Last Tuesday.

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Rust Jobs

• Backend Engineer, Data Processing – Rust (Remote) at Kraken.
• Rust Developer (US & Canada) at 1Password.
• Infrastructure Engineer at Aleph Alpha, Heidelberg, Germany.

Tweet us at @ThisWeekInRust to get your job offers listed here!

Quote of the Week

This viewpoint is very controversial, and I have no capacity to debate it with anyone who disagrees with me. But Rust has a very powerful macro system, so I don’t have to.

– withoutboats blogging about failure/fehler

Thanks to lxrec for the suggestions!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nasa42 and llogiq.

Discuss on r/rust.

https://this-week-in-rust.org/blog/2020/04/14/this-week-in-rust-334/