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

Official

• [Foundation] Hello World!
• [Inside] 1.50.0 pre-release testing

Newsletters

• This Month in Rust GameDev #18 - January 2021
• This Month in Rust OSDev (January 2021)

Project/Tooling Updates

• rust-analyzer Changelog #63
• Launching wasm.rs: a collection of crates, a community
• A Memory Safe TLS Module for the Apache HTTP Server

Observations/Thoughts

• Benchmarking Tokio Tasks and Goroutines
• A Better Rust Profiler
• An unsafe tour of Rust's Send and Sync
• Improving texture atlas allocation in WebRender

Rust Walkthroughs

• Async Rust: Futures, Tasks, Wakers; Oh My!
• Rust for Haskell Programmers!
• Rust CLI Game of Life tutorial - Part 1
• Where everything went wrong...
• Rust for Clojurists
• [ES] El formato RON: Rusty Object Notation
• [video] 1Password Developer Fireside Chat: Introduction to Rust Macros
• [video] Dynamic vs Static Dispatch in Rust

Miscellaneous

• Congratulations, Rustaceans, on the creation of the Rust Foundation!
• Microsoft joins Rust Foundation
• Google joins the Rust Foundation
• Mozilla Welcomes the Rust Foundation
• Trusted Programming - Our Rust Mission at Huawei
• YSK: VSCode's most recent update fixed a quirk in Rust workflows
• curl supports rustls
• Architecting Artichoke Ruby: A Modular Ruby implementation written in Rust
• [video] Interview with Ashley Williams, Rust Foundation Interim Executive Director (Part 1)

Crate of the Week

This week's crate is threadIO, a crate that makes disk IO in a background thread easy and elegant.

Thanks to David Andersen 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.

Fuchsia has several issues available:

• [netstack3] ARP: Add tests for ARP on a broadcast medium
• [netstack3] Migrate all transport protocols to trait associated types
• [netstack3] Split IpProto into Ipv4Proto and Ipv6NextHeader
• [net-types] Add common prefix length calculation for IP addresses
• [netstack3] Make sure ICMP messages are not sent in response to non-initial fragment packets
• [internet-checksum] Clarify documentation around odd byte lengths
• [netstack3] IP fragment reassembly vulnerable to FragmentSmack

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

Updates from Rust Core

384 pull requests were merged in the last week

• add AArch64 big-endian and ILP32 targets
• improve handling of spans around macro result parse errors
• identify unreachable subpatterns more reliably
• fix issues with move closures and mutability
• const_evaluatable: consider sub-expressions to be evaluatable
• introduce future-compatibility warning for forbidden lint groups
• Box the biggest ast::ItemKind variants
• improve error message for disallowed ptr-to-int casts in const eval
• typeck: emit structured suggestions for tuple struct syntax
• faster few span methods
• fix bug with assert!() calling the wrong edition of panic!()
• make Allocator object-safe
• add Frames Iterator for Backtrace
• add Vec::extend_from_within method under vec_extend_from_within feature gate
• BTreeMap: make Ord bound explicit, compile-test its absence
• implement TrustedLen for Fuse<I: TrustedLen>
• rename Iterator::fold_first to reduce and stabilize it
• stabilize the Wake trait
• stabilize peekable_next_if
• stabilize poison API of Once, rename poisoned()
• stabilize remaining integer methods as const fn
• futures-rs: avoid once_cell in static wakers
• hashbrown: implement From<HashMap<T, ()>> for HashSet<T>
• cargo: fix panic with doc collision orphan
• cargo: fix env/cfg set for cargo test and cargo run
• make rustdoc respect --error-format short in doctests
• clippy: fix let_underscore_drop false positive
• clippy: fix let_and_return false positive
• clippy: don't trigger exhaustive_structs for structs with private fields
• clippy: add new lint missing_panics_doc
• compiletest: Add option to emit compiler stderr per bitwidth

Rust Compiler Performance Triage

No triage report this week

Approved RFCs

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

• Rust 2021 Roadmap

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

• adds async stream rfc
• RFC: add the Freeze trait to libcore/libstd
• Generic Pointer to Field

Tracking Issues & PRs

• [disposition: merge] Allow leading | anywhere we allow or-patterns
• [disposition: merge] impl PartialEq<Punct> for char; symmetry for #78636
• [disposition: merge] Add an impl of Error on Arc<impl Error>.
• [disposition: merge] Add NotSupported to std::io::ErrorKind
• [disposition: merge] Tracking issue for Option::expect_none(msg) and unwrap_none()

New RFCs

• Add named path bases to cargo

Upcoming Events

Online

• February 11, Washington, DC, US - Let's learn to Rust nice with others - Rust DC
• February 11, San Diego, CA, US - February 2021 Tele-Meetup - San Diego Rust
• February 17, Vancouver, BC, CA - Rust Study/Hack/Hang-out night - Vancouver Rust
• February 18, Berlin, DE - Rust Hack and Learn - Berline.rs
• February 23, Dallas, TX, US - Last Tuesday - Dallas Rust

North America

• February 11, Columbus, OH, US - Monthly Meeting - Columbus Rust Society

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

• Rust Backend Engineer at TrueLayer (London, UK)
• Rust Backend Engineer at TrueLayer (Milan, Italy)
• Rust Technical Lead at TrueLayer (London, UK)
• Rust Technical Lead at TrueLayer (Milan, Italy)
• Senior Software Engineer (Rust & C++) at NZXT (Remote)
• Rust Software Engineer at JetASAP (Remote US or CA)
• Backend Engineer - Rust at Kraken (Remote)
• Backend Engineer, Kraken Futures - Rust at Kraken (Remote)
• Rust API SDET at Kraken (Remote)
• Rust Engineer, Desktop GUI - Cryptowatch at Kraken (Remote)
• Senior Banking Engineer - Rust at Kraken (Remote)
• Software Engineer - Trading Technology (Rust) at Kraken (Remote)

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

Quote of the Week

The main theme of Rust is not systems programming, speed, or memory safety - it's moving runtime problems to compile time. Everything else is incidental. This is an invaluable quality of any language, and is something Rust greatly excels at.

– /u/OS6aDohpegavod4 on /r/rust

Thanks to Chris for the suggestion.

Please submit quotes and vote for next week!

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

Discuss on r/rust