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This Week in Rust 582

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? Tag us at @ThisWeekInRust on X (formerly Twitter) or @ThisWeekinRust on mastodon.social, or send us a pull request. Want to get involved? We love contributions.

This Week in Rust is openly developed on GitHub and archives can be viewed at this-week-in-rust.org. If you find any errors in this week's issue, please submit a PR.

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Updates from Rust Community

Official

Announcing Rust 1.84.0

This Month in Our Test Infra: December 2024

Foundation

Announcing Rust Global 2025: London

Newsletters

This Month in Rust OSDev: December 2024

Rust Trends Issue #57

Project/Tooling Updates

cargo.nvim - A Neovim plugin for Rust's Cargo commands

Context-Generic Programming Updates: v0.3.0 Release and New Chapters

The RTen machine learning runtime - a 2024 retrospective

Observations/Thoughts

The gen auto-trait problem

Async Rust is about concurrency, not (just) performance

The Emotional Appeal of Rust

[audio] Brave with Anton Lazarev

[audio] Lychee with Matthias Endler

Rust Walkthroughs

Creating an embedded device driver in Rust

Const Evaluation in Rust For Hex Strings Validation

Concurrent and parallel future execution in Rust

[video] Intro to Embassy: embedded development with async Rust

[video] Comprehending Proc Macros

[video] CppCon - C++/Rust Interop: Using Bridges in Practice

Miscellaneous

December 2024 Rust Jobs Report

Tracing Large Memory Allocations in Rust with BPFtrace

On LLMs and Code Optimization

Nand2Tetris - Project 7 (VM Translator Part 1)

Crate of the Week

This week's crate is vidyut, a Sanskrit toolkit containing functionality about meter, segmentation, inflections, etc.

Thanks to Arun Prasad for the self-suggestion!

Please submit your suggestions and votes for next week!

Calls 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:

RFCs

No calls for testing were issued this week.

Rust

Tracking issue for RFC 3695: Allow boolean literals as cfg predicates

Testing steps

Rustup

No calls for testing were issued 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.

RFCs

Rust

Rustup

Call for Participation; projects and speakers

CFP - Projects

Always wanted to contribute to open-source projects but did not 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.

rama - see if improvements can/have-to be made to rama's http open telemetry layer support

rama – add rama to TechEmpower's FrameworkBenchmark

rama – add rama server benchmark to sharkbench

If you are a Rust project owner and are looking for contributors, please submit tasks here or through a PR to TWiR or by reaching out on X (formerly Twitter) or Mastodon!

CFP - Events

Are you a new or experienced speaker looking for a place to share something cool? This section highlights events that are being planned and are accepting submissions to join their event as a speaker.

Rust Week (Rust NL) | Closes on 2024-01-19 | Utrecht, NL | Event on 2025-05-13 & 2025-05-14

Rust Summit | Rolling deadline | Belgrade, RS | Event on 2025-06-07

If you are an event organizer hoping to expand the reach of your event, please submit a link to the website through a PR to TWiR or by reaching out on X (formerly Twitter) or Mastodon!

Updates from the Rust Project

469 pull requests were merged in the last week

add new {x86_64,i686}-win7-windows-gnu targets

arm: add unstable soft-float target feature

-Zrandomize-layout harder. Foo<T> != Foo<U>

best_blame_constraint: Blame better constraints when the region graph has cycles from invariance or 'static

mir_transform: implement #[rustc_force_inline]

run_make_support: add #![warn(unreachable_pub)]

account for identity substituted items in symbol mangling

add -Zmin-function-alignment

add default_field_values entry to unstable book

add a list of symbols for stable standard library crates

add an InstSimplify for repetitive array expressions

add inherent versions of MaybeUninit methods for slices

add missing provenance APIs on NonNull

assert that Instance::try_resolve is only used on body-like things

avoid ICE: Account for for<'a> types when checking for non-structural type in constant as pattern

avoid replacing the definition of CURRENT_RUSTC_VERSION

cleanup suggest_binding_for_closure_capture_self diag in borrowck

condvar: implement wait_timeout for targets without threads

convert typeck constraints in location-sensitive polonius

depth limit const eval query

detect mut arg: &Ty meant to be arg: &mut Ty and provide structured suggestion

do not ICE when encountering predicates from other items in method error reporting

eagerly collect mono items for non-generic closures

ensure that we don't try to access fields on a non-struct pattern type

exhaustively handle expressions in patterns

fix ICE with references to infinite structs in consts

fix cycle error only occurring with -Zdump-mir

fix handling of ZST in win64 ABI on windows-msvc targets

implement const Destruct in old solver

lower Guard Patterns to HIR

make (unstable API) UniqueRc invariant for soundness

make MIR cleanup for functions with impossible predicates into a real MIR pass

make lit_to_mir_constant and lit_to_const infallible

normalize each signature input/output in typeck_with_fallback with its own span

remove a bunch of diagnostic stashing that doesn't do anything

remove allocations from case-insensitive comparison to keywords

remove special-casing for argument patterns in MIR typeck (attempt to fix perf regression of #133858)

reserve x18 register for aarch64 wrs vxworks target

rm unnecessary OpaqueTypeDecl wrapper

suggest Replacing Comma with Semicolon in Incorrect Repeat Expressions

support target specific optimized-compiler-builtins

unify conditional-const error reporting with non-const error reporting

use a post-monomorphization typing env when mangling components that come from impls

use llvm.memset.p0i8.* to initialize all same-bytes arrays

used pthread name functions returning result for FreeBSD and DragonFly

warn about broken simd not only on structs but also enums and unions when we didn't opt in to it

implement trait upcasting

mir-opt: GVN some more transmute cases

miri: add FreeBSD maintainer; test all of Solarish

miri: added Android to epoll and eventfd test targets

miri: adjust the way we build miri-script in RA, to fix proc-macros

miri: illumos: added epoll and eventfd

miri: supported fioclex for ioctl on macos

miri: switched FreeBSD to pthread_setname_np

miri: use deref_poiner_as instead of deref_pointer

proc_macro: Use ToTokens trait in quote macro

add #[inline] to copy_from_slice

impl String::into_chars

initial fs module for uefi

hashbrown: added Allocator template argument for rustc_iter

account for optimization levels other than numbers

cargo: schemas: Fix 'metadata' JSON Schema

cargo: schemas: Fix the [lints] JSON Schema

cargo: perf: cargo-package: match certain path prefix with pathspec

cargo: fix: emit warnings as warnings when learning rust target info

cargo: make "C" explicit in extern "C"

cargo: setup cargo environment for cargo rustc --print

cargo: simplify SourceID Ord/Eq

rustdoc-json: include items in stripped modules in Crate::paths

rustdoc: use import stability marker in display

rustdoc: use stable paths as preferred canonical paths

rustfmt: drop nightly-gating of the --style-edition flag registration

clippy: add new lint unneeded_struct_pattern

clippy: auto-fix slow_vector_initialization in some cases

clippy: do not intersect spans coming from different contexts

clippy: do not look for significant drop inside .await expansion

clippy: do not propose to elide lifetimes if this causes an ambiguity

clippy: do not remove identity mapping if mandatory mutability would be lost

clippy: do not trigger redundant_pub_crate in external macros

clippy: don't emit machine applicable map_flatten lint if there are code comments

clippy: don't suggest to use cloned for Cow in unnecessary_to_owned

clippy: fix type suggestion for manual_is_ascii_check

clippy: improve needless_as_bytes to also detect str::bytes()

clippy: new lint: manual_ok_err

clippy: remove unneeded parentheses in unnecessary_map_or lint output

rust-analyzer: add a new and improved syntax tree view

rust-analyzer: add config setting which allows adding additional include paths to the VFS

rust-analyzer: re-implement rust string highlighting via tool attribute

rust-analyzer: fix JSON project PackageRoot buildfile inclusion

rust-analyzer: do not compute prettify_macro_expansion() unless the "Inline macro" assist has actually been invoked

rust-analyzer: do not offer completions within macro strings

rust-analyzer: fix env/option_env macro check disregarding macro_rules definitions

rust-analyzer: fix ref text edit for binding mode hints

rust-analyzer: fix a bug with missing binding in MBE

rust-analyzer: fix actual token lookup in completion's expand()

rust-analyzer: fix another issue with fixup reversing

rust-analyzer: fix diagnostics not clearing between flychecks

rust-analyzer: make edition per-token, not per-file

rust-analyzer: implement #[rust_analyzer::skip] for bodies

rust-analyzer: implement implicit sized bound inlay hints

rust-analyzer: improve hover module path rendering

Rust Compiler Performance Triage

A quiet week with little change to the actual compiler performance. The biggest compiler regression was quickly recognized and reverted.

Triage done by @rylev. Revision range: 0f1e965f..1ab85fbd

Summary:

(instructions:u) mean range count Regressions ❌ (primary) 0.4% [0.1%, 1.8%] 21 Regressions ❌ (secondary) 0.5% [0.0%, 2.0%] 35 Improvements ✅ (primary) -0.8% [-2.7%, -0.3%] 6 Improvements ✅ (secondary) -10.2% [-27.8%, -0.1%] 13 All ❌✅ (primary) 0.2% [-2.7%, 1.8%] 27

4 Regressions, 3 Improvements, 3 Mixed; 3 of them in rollups 44 artifact comparisons made in total

Full report here

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

Supertrait item shadowing v2

Tracking Issues & PRs

Rust

remove support for the (unstable) #[start] attribute

fully de-stabilize all custom inner attributes

Uplift clippy::double_neg lint as double_negations

Optimize Seek::stream_len impl for File

[rustdoc] Add sans-serif font setting

Tracking Issue for PathBuf::add_extension and Path::with_added_extension

Make the wasm_c_abi future compat warning a hard error

const-eval: detect more pointers as definitely not-null

Consider fields to be inhabited if they are unstable

disallow repr() on invalid items

Cargo

No Cargo Tracking Issues or PRs entered Final Comment Period this week.

Language Team

No Language Team Proposals entered Final Comment Period this week.

Language Reference

distinct 'static' items never overlap

Unsafe Code Guidelines

No Unsafe Code Guideline Tracking Issues or PRs entered Final Comment Period this week.

New and Updated RFCs

Make trait methods callable in const contexts

RFC: Allow packages to specify a set of supported targets

Upcoming Events

Rusty Events between 2025-01-15 - 2025-02-12 🦀

Virtual

2025-01-15 | Virtual (London, UK) | London Rust Project Group

Meet and greet with project allocations

2025-01-15 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪

An introduction to WASM in Rust with Márk Tolmács (Virtual, English)

2025-01-15 | Virtual (Vancouver, BC, CA) | Vancouver Rust

Leptos

2025-01-16 | Virtual (Berlin, DE) | OpenTechSchool Berlin + Rust Berlin

Rust Hack and Learn | Mirror: Rust Hack n Learn Meetup

2025-01-16 | Virtual (San Diego, CA, US) | San Diego Rust

San Diego Rust January 2025 Tele-Meetup

2025-01-16 | Virtual and In-Person (Redmond, WA, US) | Seattle Rust User Group

January Meetup

2025-01-17 | Virtual (Jersey City, NJ, US) | Jersey City Classy and Curious Coders Club Cooperative

Rust Coding / Game Dev Fridays Open Mob Session!

2025-01-21 | Virtual (Tel Aviv-Yafo, IL) | Rust 🦀 TLV

Exploring Rust Enums with Yoni Peleg (Virtual, Hebrew)

2025-01-21 | Virtual (Washington, DC, US) | Rust DC

Mid-month Rustful

2025-01-22 | Virtual (Rotterdam, NL) | Bevy Game Development

Bevy Meetup #8

2025-01-23 & 2025-01-24 | Virtual | Mainmatter Rust Workshop

Remote Workshop: Testing for Rust projects – going beyond the basics

2025-01-24 | Virtual (Jersey City, NJ, US) | Jersey City Classy and Curious Coders Club Cooperative

Rust Coding / Game Dev Fridays Open Mob Session!

2025-01-26 | Virtual (Tel Aviv-Yafo, IL) | Rust 🦀 TLV

Rust and embedded programming with Leon Vak (online in Hebrew)

2025-01-27 | Virtual (London, UK) | London Rust Project Group

using traits in Rust for flexibility, mocking/ unit testing, and more

2025-01-28 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

Last Tuesday

2025-01-30 | Virtual (Berlin, DE) | OpenTechSchool Berlin + Rust Berlin

Rust Hack and Learn | Mirror: Rust Hack n Learn Meetup

2025-01-30 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup

Quantum Computers Can’t Rust-Proof This!

2025-01-30 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪

Are We Embedded Yet? - Implementing tiny HTTP server on a microcontroller

2025-01-31 | Virtual (Delhi, IN) | Hackathon Raptors Association

Blazingly Fast Rust Hackathon

2025-01-31 | Virtual (Jersey City, NJ, US) | Jersey City Classy and Curious Coders Club Cooperative

Rust Coding / Game Dev Fridays Open Mob Session!

2025-02-01 | Virtual (Kampala, UG) | Rust Circle Kampala

Rust Circle Meetup

2025-02-04 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup

Buffalo Rust User Group

2025-02-05 | Virtual (Indianapolis, IN, US) | Indy Rust

Indy.rs - with Social Distancing

2025-02-07 | Virtual (Jersey City, NJ, US) | Jersey City Classy and Curious Coders Club Cooperative

Rust Coding / Game Dev Fridays Open Mob Session!

2025-02-11 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

Second Tuesday

2025-02-11 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪

Meet Elusion: New DataFrame Library powered by Rust 🦀 with Borivoj Grujicic

Europe

2025-01-16 | Amsterdam, NL | Rust Developers Amsterdam Group

Meetup @ Avalor AI

2025-01-16 | Karlsruhe, DE | Rust Hack & Learn Karlsruhe

Karlsruhe Rust Hack and Learn Meetup bei BlueYonder

2025-01-18 | Stockholm, SE | Stockholm Rust

Ferris' Fika Forum #8

2025-01-21 | Edinburgh, GB | Rust and Friends

Rust and Friends (evening pub)

2025-01-21 | Ghent, BE | Systems Programming Ghent

Tech Talks & Dinner: Insights on Systems Programming Side Projects (in Rust) - Leptos (full-stack Rust with webassembly), Karyon (distributed p2p software in Rust), FunDSP (audio synthesis in Rust)

2025-01-21 | Leipzig, SN, DE | Rust - Modern Systems Programming in Leipzig

Self-Organized Peer-to-Peer Networks using Rust

2025-01-22 | London, GB | Rust London User Group

Rust London's New Years Party & Community Swag Drop

2025-01-22 | Oberursel, DE | Rust Rhein Main

Rust 2024 Edition and Beyond

2025-01-23 | Barcelona, ES | Barcelona Free Software

Why Build a New Browser Engine in Rust?

2025-01-23 | Paris, FR | Rust Paris

Rust meetup #74

2025-01-24 | Edinburgh, GB | Rust and Friends

Rust and Friends (daytime coffee)

2025-01-27 | Prague, CZ | Rust Prague

Rust Meetup Prague (January 2025)

2025-01-28 | Aarhus, DK | Rust Aarhus

Hack Night - Advent of Code

2025-01-28 | Manchester, GB | Rust Manchester

Rust Manchester January Code Night

2025-01-30 | Augsburg, DE | Rust Meetup Augsburg

Rust Meetup #11: Hypermedia-driven development in Rust

2025-01-30 | Berlin, DE | Rust Berlin

Rust and Tell - Title

2025-02-01 | Brussels, BE | FOSDEM 2025

FOSDEM Rust Devroom

2025-02-01 | Nürnberg, DE | Rust Nuremberg

Technikmuseum Sinsheim

2025-02-05 | Oxford, GB | Oxford Rust Meetup Group

Oxford Rust and C++ social

2025-02-12 | Reading, GB | Reading Rust Workshop

Reading Rust Meetup

North America

2025-01-16 | Nashville, TN, US | Music City Rust Developers

Rust Game Development Series 1: Community Introductions

2025-01-16 | Redmond, WA, US | Seattle Rust User Group

January Meetup

2025-01-16 | Spokane, WA, US | Spokane Rust

Spokane Rust Monthly Meetup: Traits and Generics

2025-01-17 | México City, MX | Rust MX

Multithreading y Async en Rust 101 - HolaMundo - Parte 3

2025-01-18 | Boston, MA, US | Boston Rust Meetup

Back Bay Rust Lunch, Jan 18

2025-01-21 | New York, NY, US | Rust NYC

Rust NYC Monthly Meetup

2025-01-21 | San Francisco, CA, US | San Francisco Rust Study Group

Rust Hacking in Person

2025-01-22 | Austin, TX, US | Rust ATX

Rust Lunch - Fareground

2025-01-23 | Mountain View, CA, US | Hacker Dojo

RUST MEETUP at HACKER DOJO | Rust Meetup at Hacker Dojo - Mountain View Rust Meetup Page

2025-01-28 | Boulder, CO, US | Boulder Rust Meetup

From Basics to Advanced: Testing

2025-02-06 | Saint Louis, MO, US | STL Rust

Async, the Future of Futures

Oceania:

2025-02-04 | Auckland, NZ | Rust AKL

Rust AKL: How We Learn Rust

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

This is a wonderful unsoundness and I am incredibly excited about it :3

– lcnr on github

Thanks to Christoph Grenz for the suggestion!

Please submit quotes and vote for next week!

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

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Discuss on r/rust

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