Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. 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

Foundation

• Implementing the Network Time Protocol (NTP) in Rust

Project/Tooling Updates

• rust-analyzer changelog #152
• IntelliJ Rust Changelog #181
• mirrord 3.0 is out!
• gix credential and diffing with similar
• New release – gtk-rs
• Zellij 0.32.0: YAML => KDL, actions through CLI, command panes and a new layout system
• RPITs, RPITITs and AFITs and their relationship
• Evaluating Build Scripts in the IntelliJ Rust Plugin

Observations/Thoughts

• Adding Ada to Rust
• Adding a JavaScript interpreter to your Rust project
• Rust in the Linux Kernel: Just the Beginning
• A deeper look into the GCC Rust front-end
• The HTTP crash course nobody asked for
• Making Rust attractive for writing GTK applications
• Adventures In Cross Compilation
• Compiling Brainfuck code - Part 1: A Optimized Interpreter
• Rust Embedded Graphics with the MAX7219
• Buffers on the edge: Python and Rust · Alex Gaynor
• Writing Better Integration Tests with RAII
• Contention on multi-threaded regex matching

Rust Walkthroughs

• Serde by Example 2: OpenStreetMap
• Enums and Pattern Matching in Rust
• Creating a minimal RESTful song request API using Rocket
• Compiling Rust libraries for Android apps: a deep dive
• Inline Crates
• Writing a HashMap in Rust without unsafe
• A Rust web app with HTML templates
• Nine Rules for Creating Procedural Macros in Rust: Practical Lessons from anyinput, a New Macro for Easily Accepting String/Path/Iterator/Array-Like Inputs
• [series] Sqlite File Parser Pt 4
• MacroKata: Rustlings style exercises for learning macros

Miscellaneous

• [video] Web-native Rust apps (what will YOU build?)
• [video] Rapid Prototyping in Rust: Write fast like Python; Run fast like C
• [video] Let our rusty crab explore the depths of the C by Yvan Sraka
• [video] Case Study: Rust in axle OS by Philip Tennen
• [video] Aya: Extending the Linux Kernel with eBPF and Rust by Michal Rostecki
• [video] Building a Lightweight IR and Backend for YJIT / Maxime Chevalier-Boisvert
• [video] RustcContributor::explore: @compiler-errors session - RPITIT deep dive
• Step-by-step guide to building a web-crawler
• SQLx in 12 minutes - Rust + Actix Web + PostgreSQL
• Bevy Basics Scenes(re-upload)

Crate of the Week

This week's crate is humantime, a parser and formatter for std::time::{Duration, SystemTime}.

Thanks to Aleksey Kladov for the suggestion!

Please 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.

• zerocopy - Optimize caching in CI
• boa - hacktoberfest issues
• boa - bugs that cause boa to panic
• Ockam - Show "help" output when no args passed on subscription show clap command
• Ockam - Add argument to node create clap command to terminate on EOF on STDIN
• Ockam - Extract duplicated code into a shared helper function

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

Updates from the Rust Project

398 pull requests were merged in the last week

• linker: fix weak lang item linking with combination windows-gnu + LLD + LTO
• recover when unclosed char literal is parsed as a lifetime in some positions
• allow #[unstable] impls for fn() with unstable abi
• allow Vec::leak when using no_global_oom_handling
• allow semicolon after closure within parentheses in macros
• change unknown_lint applicability to MaybeIncorrect
• require Drop impls to have the same constness on its bounds as the bounds on the struct have
• require lifetime bounds for opaque types in order to allow hidden types to capture said lifetimes
• add default trait implementations for "c-unwind" ABI function pointers
• filtering spans when emitting json
• suggest let for assignment, and some code refactor
• do not suggest trivially false const predicates
• standardize "use parentheses to call" suggestions between typeck and trait selection
• escape string literals when fixing overlong char literal
• handle return-position impl Trait in traits properly in register_hidden_type
• improve "~const is not allowed here" message
• add diagnostic for calling a function with the same name with unresolved Macro
• chalk: consider ADT's generic parameters
• miri: fix ICE when trying to GC a Stack with an unknown bottom
• miri: add scalar-abi-only field retagging option
• erase regions before checking for Default in uninitialized binding error
• introduce deduced parameter attributes, and use them for deducing readonly on indirect immutable freeze by-value function parameters
• let expressions on RHS shouldn't be terminating scopes
• make diagnostic for unsatisfied Termination bounds more precise
• make order_dependent_trait_objects show up in future-breakage reports
• reduce false positives in msys2 detection
• enable LTO for rustc_driver.so
• remove byte swap of valtree hash on big endian
• remove more attributes from metadata
• use Set instead of Vec in transitive_relation
• sort tests at compile time, not at startup
• use already checked RHS ty for LHS deref suggestions
• stabilize proc_macro::Span::source_text
• stabilize duration_checked_float
• stabilize asm_sym
• make transpose const and inline
• mark std::os::wasi::io::AsFd etc. as stable
• eliminate 280-byte memset from ReadDir iterator
• optimize slice_iter.copied().next_chunk()
• implement String::leak
• adjust argument type for mutable with_metadata_of
• hashbrown: add support for 16-bit targets
• futures: do not store items field in ReadyChunks
• cargo: fix publishing with a dependency on a sparse registry
• cargo: improve the error message if publish is false or empty list
• cargo: publish: check remote git registry more than once post-publish
• rustdoc: eliminate uses of EarlyDocLinkResolver::all_traits
• rustdoc: do not filter out cross-crate Self: Sized bounds
• crates.io: introduce daily limit of published versions per crate
• docs.rs: perf: change the link in the topbar to avoid a redirect
• bindgen: avoid suppressing panic messages
• bindgen: use panic hooks instead of using catch_unwind
• clippy: add missing_trait_methods lint
• clippy: add lint to tell about let else pattern
• clippy: enable test no_std_main_recursion
• clippy: fix allow_attributes_without_reason applying to external crate macros
• clippy: fix ICE due to out-of-bounds array access
• clippy: improvement for equatable_if_let
• clippy: collapsible_match specify field name when destructuring structs
• clippy: unwrap_used, expect_used do not lint in test cfg
• clippy: ref_option_ref do not lint when inner reference is mutable
• clippy: add from_raw_with_void_ptr lint
• clippy: fix box-default ignoring trait objects' types
• clippy: support map_or for or_fun_call lint
• rust-analyzer: support const generics for builtin derive macro
• rust-analyzer: workaround the python vscode extension's polyfill
• rust-analyzer: add multiple getters mode in generate_getter
• rust-analyzer: don't catch the server activation error
• rust-analyzer: don't respond with an error when requesting a shutdown while starting
• rust-analyzer: fix DidSaveDocument requests blocking the server on startup
• rust-analyzer: fix standard flycheck command not being executed in the workspace it is being invoked for
• rust-analyzer: handle multiple projects sharing dependency correctly in once strategy

Rust Compiler Performance Triage

An amazing week. We saw more wins than losses; I want to call out specifically the wins from removing attributes from metadata (up to 8.2% faster builds for 18 benchmarks) and from enabling LTO for rustc_driver.so (up to 9.6% faster builds for an epic 230 benchmarks, with zero regressions).

Triage done by @pnkfelix. Revision range: e0f8e60d..629a414d

2 Regressions, 6 Improvements, 2 Mixed; 2 of them in rollups 53 artifact comparisons made in total

See full report for details.

Call for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization. The following RFCs would benefit from user testing before moving forward:

• No RFCs issued a call for testing this week.

If you are a feature implementer and would like your RFC to appear on the above list, add the new call-for-testing label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature need testing.

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

• No RFCs entered Final Comment Period this week.

Tracking Issues & PRs

• [disposition: merge] Make PROC_MACRO_DERIVE_RESOLUTION_FALLBACK a hard error
• [disposition: merge] Elaborate supertrait obligations when deducing closure signatures
• [disposition: merge] Tracking Issue for Integer::{ilog,ilog2,ilog10}
• [disposition: close] Propagate deref coercion into block
• [disposition: merge] Derive Eq and Hash for ControlFlow

New and Updated RFCs

• [new] Warning on unintended implicit drops
• [new] Niches
• [new] Deprecate PhantomData dropck

Upcoming Events

Rusty Events between 2022-10-26 - 2022-11-23 🦀

Virtual

• 2022-10-26 | Virtual (Redmond, WA, US / New York, NY, US / Toronto, CA / Stockholm, SE / London, UK) | Microsoft Reactor Redmond
  • Your First Rust Project: Rust Basics | New York Mirror | Toronto Mirror | Stockholm Mirror | London Mirror
• 2022-10-27 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Using Applicative Functors to parse command line options
• 2022-10-27 | Virtual (Karlsruhe, DE) | The Karlsruhe Functional Programmers Meetup Group
  • Stammtisch (gemeinsam mit der C++ UG KA) (various topics, from C++ to Rust...)
• 2022-10-27 | Virtual (Linz, AT) | Rust Linz
  • Rust Meetup Linz - 26th Edition
• 2022-10-29 | Virtual (Ludwigslust, DE) | Ludwigslust Rust Meetup
  • Von Nullen und Einsen | Rust Meetup Ludwigslust #1
• 2022-11-01 | Virtual (Beijing, CN) | WebAssembly and Rust Meetup (Rustlang)
  • Monthly WasmEdge Community Meeting, a CNCF sandbox WebAssembly runtime
• 2022-11-01 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2022-11-02 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Rust and C++ Cardiff Virtual Meet
• 2022-11-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2022-11-02 | Virtual (Redmond, WA, US / San Francisco, SF, US / New York, NY, US / Toronto, CA / London, UK) | Microsoft Reactor Redmond
  • Getting Started with Rust: From Java Dev to Rust Developer | San Francisco Mirror | New York Mirror | Toronto Mirror | London Mirror
• 2022-11-02 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-11-08 | Virtual (Berlin, DE) | OpenTechSchool Berlin
  • Rust Hack and Learn
• 2022-11-08 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday
• 2022-11-08 | Virtual (Rostock, DE) | Altow Academy
  • Rust Meetup Rostock
• 2022-11-08 | Virtual (Stockholm, SE) | Func Prog Sweden
  • Tenth Func Prog Sweden MeetUp 2022 – Online (with "Ready for Rust" by Erik Dörnenburg)
• 2022-11-09 | Virtual (Malaysia, MY) | Rust Malaysia
  • Rust Meetup November 2022 - a couple of lightning talks
• 2022-11-10 | Virtual (Budapest, HU) | HWSW free!
  • RUST! RUST! RUST! meetup (online formában!)
• 2022-11-12 | Virtual | Rust GameDev
  • Rust GameDev Monthly Meetup
• 2022-11-15 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2022-11-15 | Virtual (Nairobi, KE / New York, NY, US)| Data Umbrella Africa
  • Online: Introduction to Rust Programming | New York Mirror
• 2022-11-16 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2022-11-17 | Virtual (Amsterdam, NL) | ITGilde Tech-Talks
  • Introduction “Rust” an ITGilde Tech Talk delivered by Pascal van Dam
• 2022-11-21 | Virtual (Paris, FR) | Meetup Paris - École Supérieure de Génie Informatique (ESGI)
  • Découverte de WebAssembly

Asia

• 2022-11-08 | Bangkok, TH | Tech@Agoda
  • Rustacean Bangkok 5.0.0

Europe

• 2022-10-26 | London, UK | Rust London User Group
  • LDN Talks October 2022: Host by Amazon Prime Video
• 2022-10-26 | Bristol, UK | Rust and C++ Cardiff/Rust Bristol
  • Programming Veloren & Rust for a living
• 2022-10-27 | København, DK | Copenhagen Rust Group
  • Hack Night #30
• 2022-11-23 | Bratislava, SK | Bratislava Rust Meetup Group
  • Initial Meet and Greet Rust meetup

North America

• 2022-10-27 | Lehi, UT, US | Utah Rust
  • Bevy Crash Course with Nathan and Food!
• 2022-11-10 | Columbus, OH, US | Columbus Rust Society
  • Monthly Meeting

Oceania

• 2022-11-09 | Sydney, NSW, AU | Rust Sydney
  • RustAU Sydney - Last physical for 2022 !
• 2022-11-22 | Canberra, ACT, AU | Canberra Rust User Group
  • November Meetup

South America

• 2022-11-05 | São Paulo, SP, BR | Rust São Paulo Meetup
  • Rust-SP meetup Outubro 2022

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.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

Also, I don't know how much of this is because Rust is special or because BurntSushi is a national treasure and his CSV library is impeccably constructed and documented.

– Gabe Durazo on github

Thanks to scottmcm for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, andrewpollack, U007D, kolharsam, joelmarcey, mariannegoldin, bennyvasquez.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust