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

• Building a shared vision for Async Rust
• [Inside] 1.51.0 pre-release testing
• [Foundation] Introducing Bobby Holley
• [Foundation] Introducing Tyler Mandry

Newsletters

Project/Tooling Updates

• rust-analyzer Changelog #69

Observations/Thoughts

• The biggest threat to Rust's sustainability
• Safe Systems Programming in Rust
• The GPIO war: macro bunkers for typestate explosions
• A look back at asynchronous Rust
• Rust as an App Language
• How often does Rust change?
• Serving a single file over HTTP with Rust and Go
• The Case for the Typestate Pattern - The Typestate Pattern itself
• [ZH] Rust in Embedded World
• [video] Cheaply writing a fast interpreter - Neil Mitchell

Rust Walkthroughs

• Introduction to Apache Arrow with Rust
• How to execute shellcodes from memory in Rust
• Beginner's Guide to Rust Pattern Matching
• Writing a PostgreSQL Pretty Printer in Rust: Part 1.5
• Calling .NET APIs from Rust
• The magical applications of Zero-Sized Types in Rust
• Rust and Rocket - Zero to Deploy
• Learning to Fly: Let's simulate evolution in Rust! (pt 3)
• Building an OpenStreetMap app in Rust, Part VI
• Tutorial: Writing a tiny Entity Component System in Rust
• Implementing RAII guards in Rust
• [JP] [TECH] Actix web で HttpOnly な Cookie を設定する 🍪
• [video] The four-part "Overview of the Rust Programming Language" for beginners is now complete

Papers and Research Projects

No Papers or Research Projects this week

Miscellaneous

• Streaming using Bastion & Kafka - near consumer native correlation
• Performance comparison: counting words in Python, Go, C++, C, AWK, Forth, and Rust
• Linus Torvalds on where Rust will fit into Linux
• Rust: integrating LLVM source-base code coverage with GitLab

Crate of the Week

This week's crate is egg, a project using e-graphs to provide a new way to build program optimizers and synthesizers.

Thanks to Daniel Nugent 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.

• dotenv-linter has many good first issues

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

Updates from Rust Core

389 pull requests were merged in the last week

• enable mutable noalias for LLVM >= 12 (Fingers crossed)
• allow registering tool lints with register_tool
• more precise spans for HIR paths
• const_evaluatable_checked: stop eagerly erroring in is_const_evaluatable
• miri: improve error message of calling unsupported non-"C"/"system"-ABI foreign function
• make source-based code coverage compatible with MIR inlining
• stabilize or_patterns (RFC 2535, 2530, 2175)
• stabilize feature(osstring_ascii)
• stabilize slice::IterMut::as_slice
• stabilize assoc_char_funcs and assoc_char_consts
• implement String::remove_matches
• add a check for ASCII characters in to_upper and to_lower
• fix invalid slice access in String::retain
• constify copy related functions
• add as_str method for split whitespace str iterators
• Vec::dedup_by optimization
• fix overflowing length in Vec<ZST> to VecDeque
• implement TrustedLen and TrustedRandomAccess for Range<integer>, array::IntoIter, VecDequeue's iterators
• cargo: allow cargo update to operate with the --offline flag
• cargo: refactor feature handling, and improve error messages
• rustdoc: reduce GC work during search
• rustfmt: fix issue 'double spaces between struct field prefix and identity when using long attributes

Rust Compiler Performance Triage

An overall busy but decent week for performance. While there were some performance regressions they were mostly small, and they were outnumbered by performance gains. Perhaps the most interesting news is not a compiler performance improvement but rather the introduction of no-alias optimizations at the LLVM level. This slightly hurts optimized build time performance in some cases, but it should make some workloads run faster after compilation.

Triage done by @rylev. Revision range: f24ce9b0..9b6339e4

2 Regressions, 5 Improvements, 3 Mixed

1 of them in rollups

Approved RFCs

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

• Adds must_not_suspend_lint RFC
• adds async stream rfc
• Make the authors field optional

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

• RFC: Declarative macro metavariable expressions
• RFC: Hidden trait implementations

Tracking Issues & PRs

• [disposition: merge] Stabilize bufreader_seek_relative
• [disposition: merge] Add IEEE 754 compliant fmt/parse of -0, infinity, NaN
• [disposition: merge] Implement indexing slices with pairs of core::ops::Bound<usize>

New RFCs

No new RFCs were proposed this week.

Upcoming Events

Online

• March 25, Barcelona, ES - BcnRust Meetup.
• March 30, Munich, DE - Rust Remote #6 - Rust Munich
• March 30, Dallas, TX, US - Last Tuesday - Dallas Rust
• April 1, Berlin, DE - Rust Hack and Learn - Berline.rs
• April 6, Buffalo, NY, US - Buffalo Rust User Group - Buffalo Rust Meetup

Asia Pacific

• March 31, Wellington, NZ - Coffee - Rust Wellington

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

MongoDB

• Senior Rust Engineer, Database Experience (Remote, North America)

IONQ

• Senior Software Engineer, Quantum Operating Systems (Remote)

Pondurance

• Software Data Engineer - National (Remote)

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

Quote of the Week

This is just to say,
I have rebased
the feature branch
opened against
master

and which
you might have been
already working
on fixing

Forgive me,
the diff was so trivial
so minor
so smol

– Jubilee on rust-lang zulip

Thanks to Josh Triplett 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