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

• 🎈🎉 Announcing Rust 1.43.0. 🎉🎈
• How to speed up the Rust compiler in 2020.
• A taste of WebGPU in Firefox.
• Data ingestion with Rust and AWS Lambda.
• Embedded Rust pattern - zero sized references.
• Implementing a linear quadtree in Rust.
• Memory efficient serialization of tagged union.
• Unpacking Serde.
• [video] Rust stream: ownership, closures, and threads - oh my.
• [video] Crust of Rust: lifetime annotations.
• First impressions on Rust and WebAssembly.
• From Rust to WebAssembly: Building an interactive note-taking web app with Actix & Yew.
• Rust concurrency: five easy pieces.
• (Almost) lockless stream buffering.
• Rust and Node.js: a match made in heaven.
• Reducing the size of a Rust GStreamer plugin.
• Writing Python inside your Rust code — Part 2.

Crate of the Week

This week's crate is coercible_errors, a library that allows generic trait implementations to omit the size cost of Result::Err if errors never happen.

Thanks to Zac Burns 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.

• ALMA: Add flag to install to partition instead of formatting disk.

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

• don't run various MIR optimizations at mir-opt-level=0
• replace thread_local with generator resume arguments in box_region
• fix -Zast-json to output correct JSON form
• allow wasm32 compilation of librustc_data_structures/profiling.rs
• proc_macro::is_available()
• proc_macro: stabilize Span::resolved_at and Span::located_at
• attempt to recover perf by removing exports_all_green
• chalk: use FxHashMap/FxHashSet and add well-formed clause for tuples
• ConstProp: use a BitSet<Local> instead of IndexVec<Local, bool>
• fix span of while (let) expressions after lowering
• Miri Frame: use mir::Location to represent position in function
• add BinaryHeap::retain
• add a function to turn Box<T> into Box<[T]>
• add missing Send and Sync impls for linked list Cursor and CursorMut
• implement BitOr and BitOrAssign for the NonZero integer types
• stabilize most common subset of alloc_layout_extras
• stabilize Span::mixed_site
• stabilize BTreeMap::remove_entry
• futures: introduce ready_chunks adaptor
• backport to 0.1: Avoid starvation from FuturesUnordered::poll_next
• futures: add AsyncWriteExt::write_all_vectored utility
• hashbrown: future-proof specialization code
• hashbrown: remove unsound use of specialization
• cargo: fix warning for resolve mismatch in workspace
• cargo: add resolver opt-in for new feature resolver
• rustdoc: replace big JS dict with JSON parsing

Approved RFCs

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

• RFC 2836: Introduce the ASM project group.

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] Project Groups.

Tracking Issues & PRs

• [disposition: merge] Stabilize the #[alloc_error_handler] attribute (for no_std + liballoc).
• [disposition: merge] Make handle_alloc_error default to panic (for no_std + liballoc).
• [disposition: merge] Remove language-level UB for non-UTF-8 str.
• [disposition: merge] Define UB in float-to-int casts to saturate.

New RFCs

No new RFCs were proposed this week.

Upcoming Events

Online

• Apr 30. Zurich, CH - Rust Zurich - Security in Rust: cargo-crev and cargo-audit.
• May 4. Auckland, NZ - Rust AKL - Rust Implementation of Ethereum2.0 + Adding WASM Support to a Native Application.
• May 20. Vancouver, BC, CA - Vancouver Rust - Rust Study/Hack/Hang-out night.

North America

• May 6. Portland, OR, US - PDXRust - NES Emulation in Rust.
• May 6. Indianapolis, IN, US - Indy.rs - Rust Meetup.
• May 15. Columbus, OH, US - Columbus Rust Society - Monthly Meeting.

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

• Systems Engineer - Findora, Menlo Park, CA, US.
• Software Engineer, SDK - DFINITY, Palo Alto & San Francisco CA, US.
• 2D Graphics Programmer - DUNGEONFOG, Vienna, AT.
• Senior Backend Engineer - OneSignal, San Mateo, CA, US.
• Backend Software Engineer - OneSignal, San Mateo, CA, US.
• Site Reliability Engineer - OneSignal, San Mateo, CA, US.
• Software Engineer in Test - OneSignal, San Mateo, CA, US.
• IT Cyber Security Engineer - ALEPH ALPHA GmbH, Heidelberg, DE.
• Machine Learning Engineer - ALEPH ALPHA GmbH, Heidelberg, DE.
• Software Infrastructure Engineer - ALEPH ALPHA GmbH, Heidelberg, DE.
• Rust Developer at Fusion Engineering, Delft, NL.

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

Quote of the Week

Vecs in Rust in general, are crazy fast; faster than I can replicate in C. Amazing.

– Jonathan Eisenzopf on rust-users

Thanks to Louis Cloete for the suggestions!

Please submit quotes and vote for next week!

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

Discuss on r/rust.