fidzu : thunderbird

The latest version of the Firefox Profiler is now live! Check out the full changelog below to see what's changed:

Changes:

• [Markus Stange] Some FlameGraph changes, for the function list flame graphs (#6402)
• [Markus Stange] Match source-mapped original filenames in call tree search (#6431)
• [fatadel] Automate production deployments (#6304)
• [Markus Stange] Fix source map symbolication in the presence of path collisions (#6432)
• [Markus Stange] Apply the 30s timeout to CLI integration tests (#6434)
• [Nazım Can Altınova] Add functionality to profiler-edit to merge two profiles, one with samples and one with markers (#5448)
• [fatadel] Bump profiler-cli version to 0.13.0 (#6440)

Find out more about the Firefox Profiler on profiler.firefox.com! If you have any questions, join the discussion on our Matrix channel!

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04 Nov 2026 1:13pm GMT

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.bsky.social on Bluesky 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.

Want TWIR in your inbox? Subscribe here.

Updates from Rust Community

Official

• Maintainer spotlight: Anthony Bolden (@Walnut356)
• Announcing rustup 1.29.3

Foundation

• Update on Rust Foundation Staffing

Newsletters

• Rust Trends Issue 86 - systemd Opens the Door to Rust

Project/Tooling Updates

• systemd ❤️ Rust
• sysinfo: fixing performance to retrieve process GPU usage
• Towards formal verification: mbrotli and mzstd
• Ruffle: Stable Releases, API, Text... and Everything Else!
• Progress Report #44: rustc_codegen_gcc can now bootstrap rustc on Aarch64!

Observations/Thoughts

• Thinking in Traits
• How to speed up the Rust compiler in November 2026
• It's the memory latency, stupid · Pivot blog
• The Missing Future State
• Everything you need to know to secure your Rust projects against the wave of cyberattacks
• [audio] Small Crates Behind Big Rust Systems
• [audio] Migrating C to Rust with Jonas Kruckenberg
• Building fine-grained version control for agents with Rust and Durable Objects

Rust Walkthroughs

• [series] Userland Linux scheduler in Rust - faster than time
• Who Are You? versus Who Owns You? - What Rust Memory Safety and Wireless Addressing Have in Common
• [video] Rust Atomics Demystified
• [video] Fix Your Rust Functions

Crate of the Week

This week's crate is tellus, a tokio-based actor framework that can be used without writing async code.

Thanks to Sean Kwak for the partial-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.

If you are a feature implementer and would like your RFC to appear in this list, add a 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.

No calls for testing were issued this week by Rust, Cargo, Rustup or Rust language RFCs.

Let us know if you would like your feature to be tracked as a part of this list.

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.

• [INVAR - Turn the HELLTEST hostile-input probes into committed regression tests](https://github.com/Ramesh-35/invar/issues/2

• Plastor - Port the tracing step from Python to Rust

• Plastor - Read depth from tone bands and cross-contours (fix flat heads on real drawings)
• Plastor - CI: build and run the Blender-free checks on Linux, macOS and Windows
• Plastor - mh score: report watertight and Euler characteristic
• Quill - Show the service message for chats started through a free messages link
• Quill - Apply the free messages token when opening a link that carries one
• Quill - Try Quill on real Windows and Linux machines and report what breaks

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 Bluesky 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.

• **FOSDEM'27 Rust Devroom | 2026-11-20 23:59 CET | Brussels, Belgium | 2027-01-31

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 Bluesky or Mastodon!

Updates from the Rust Project

597 pull requests were merged in the last week

Compiler

• GCI: check where-clauses of associated constants for well-formedness
• MIR move elimination (1.5/6): Ensure ZSTs are always initialized
• MIR move elimination (5/6): Storage reconstruction
• check associated const binding types
• destringlyfy lint infrastructure
• expand an early return case in coerce_unsized
• new solver opts for diesel (part 2)
• new solver opts for diesel (part 3)
• perf: emit field names as a concatenated string in derive(Debug) for structs

Library

• add MaybeUninit::from_ref
• add {Receiver, Sender, SyncSender}::{is_empty,len}
• add strict_ methods to NonZero
• add TrySendError::into_inner
• core: constify resumable_breakpoint and re-export it in std
• ensure the display impl of uXX is small with optimize_for_size
• implement Duration::display_seconds
• implement Fn traits for safe functions of any ABI
• implement Vec::retain_unstable ACP
• implement advance_back_by on Fuse
• make IoSlice and IoSliceMut methods unstably const
• move lang item collection to the resolver
• specialize vec extend_with
• optimize large elements for slice rotating

Cargo

• windows: Delay-load system DLLs that most commands don't use
• fix manifest schema generation: TomlOptLevel and StringOrVec
• warn about conflicting proc-macro manifest settings

Rustdoc

• add unstable option --crate-list-heading to customize the sidebar crate list
• improve ItemKind
• notable trait badge and popover enhancements

Rustfmt

• have cfg_select! double-brace concise formatting respect control_brace_style

Clippy

• don't report missing safety doc for #[target_feature(enable)] attributed functions
• fix ICE in arbitrary_source_item_ordering
• fix assert_is_empty false positive with constant context
• fix borrowed_box suggestion for trait objects to mention .as_ref() at call sites
• fix manual_inspect suggestions for mutating closures
• fix: signed abs rounding error in remainder identity check

Rust-Analyzer

• fix LSP panic on unbound function when generics are present
• fix lowering of yield in async gen
• fix: suggest reference after dereferences
• panic Expr not in lookup due to projection types
• perf: provide ThinMap, a map that uses ThinVec when the length is small

Rust Compiler Performance Triage

This week a 0.4% increase in instructions is traded for a 33% reduction in rmeta size on some real benchmarks. Even with that regression, this week's average is still very positive thanks to a refactoring around AttrTokenStream, by using Symbols instead of Strings in the lint infrastructure, and by avoiding an extra AST walk for lang item collection, among other things. A lot of noise this week, which is mostly caused by two large rollups whose base PR was noise.

Triage done by @JonathanBrouwer. Revision range: 019b59d8..4c46afa6

3 Regressions, 11 Improvements, 27 Mixed; 2 of them in rollups 195 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:

• RFC: Add required-targets for workspace package selection
• Update actions/deploy-pages action to v5.0.1

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.

Tracking Issues & PRs

Rust

• Properly feature gate doc(rust_logo)
• core: Stabilize abort_immediate as crash

Compiler Team (MCPs only)

• Add bootstrap tool to analyze compiler tests code coverage
• Add testing for lint machinery at runtime

No Items entered Final Comment Period this week for Rust RFCs, Cargo, Language Team, Language Reference, Leadership Council or Unsafe Code Guidelines. Let us know if you would like your PRs, Tracking Issues or RFCs to be tracked as a part of this list.

New and Updated RFCs

• Crate list heading RFC

Upcoming Events

Rusty Events between 2026-11-04 - 2026-12-02 🦀

Virtual

• 2026-11-04 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-11-05 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-11-10 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-11-12 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-11-15 | Virtual | Rust 🦀 Maven
  • Cursed Rust
• 2026-11-15 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: Third Sunday
• 2026-11-17 | Virtual | Rust 🦀 Maven
  • Miscompilation in Rust 1.97
• 2026-11-17 | Virtual (London, UK) | Women in Rust
  • Lunch & Learn: The Harness Wore a Trenchcoat - Building a Rust MCP Server
• 2026-11-17 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-11-18 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Writing a firmware for Xteink ereader in Rust
• 2026-11-19 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-11-24 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday Rust Bookclub
• 2026-12-01 | Virtual (London, UK) | Women in Rust
  • Christmas Coding Challenge - Kick Off!
• 2026-12-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing

Asia

• 2026-11-14 | Bengaluru, IN | Rust Bangalore
  • November 2026 Rustacean Meetup

Europe

• 2026-11-04 | Dublin, IE | Rust Dublin
  • Rust 263: Getting Started with the New Rust Driver for Oracle AI Database
• 2026-11-04 | Köln, DE | Rust Cologne
  • Rust in November: std discovery tour
• 2026-11-05 | Milano, IT | Rust Language Milan
  • Digital Model Trains & Rust: Bare-Metal DCC Command Station on ESP32
• 2026-11-05 | Oxford, UK | Oxford ACCU/Rust Meetup.
  • Epitome of synaptic excellence
• 2026-11-12 | Frankfurt, DE | Rust Rhein-Main
  • Debugging in Rust
• 2026-11-12 | Geneva, CH | Rust Geneva
  • Rust Meetup Geneva
• 2026-11-12 | Milano, MI, IT | Rust Language Milan
  • From Curiosity to Capability: Build Your Own Device Swarm
• 2026-11-17 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Everlock: Everything Is Git, Protocols Are Just Adapters
• 2026-11-19 | Aarhus, DK | Rust Aarhus
  • Talk Night at EIVA
• 2026-11-19 | Bergen, NO | Rust Bergen
  • Rust: FFI with C++, and Intro to Async
• 2026-11-20 and 2026-11-21 | Augsburg, DE | Rust Meetup Augsburg
  • Embedded Rust mit Embassy - Workshop und Projekttag
• 2026-11-26 | Copenhagen, DK | Copenhagen Rust Community
  • Rust meetup #73 sponsored by Adapt!
• 2026-11-26 | London, UK | Rust London User Group
  • Rust London x Zed
• 2026-11-26 | Manchester, UK | Rust Manchester
  • Rust Manchester November Code Night
• 2026-11-26 | Stockholm, SE | Stockholm Rust
  • Rust Meetup @Lovable
• 2026-12-01 | Paris, FR | Rust Paris
  • Rust meetup #90

North America

• 2026-11-05 | Montréal, CA | Rust Montréal
  • November Monthly Social
• 2026-11-05 | San Francisco, CA | Rust LA: NVIDIA
  • NVIDIA x Lawrence Harvey | CUDA Rust
• 2026-11-05 | Saint Louis, MO, US | STL Rust
  • HTMX and Rust
• 2026-11-12 | Lehi, UT, US | Utah Rust
  • Rust Game Jam
• 2026-11-12 | San Diego, CA, US | San Diego Rust
  • San Diego Rust November Meetup - Back in person!
• 2026-11-14 | Boston, MA, US | Boston Rust Meetup
  • MIT Rust Lunch, Nov 14
• 2026-11-17 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA November w/ Hadrian!
• 2026-11-17 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-11-18 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Writing a firmware for Xteink ereader in Rust
• 2026-11-18 | San Francisco, CA, US) | Bay Area Rust
  • Bay Area Rust - Social Night
• 2026-11-21 | Boston, MA, US | Boston Rust Meetup
  • Winter Hill Rust Lunch, Nov 21
• 2026-11-28 | Boston, MA, US | Boston Rust Meetup
  • South Station Rust Lunch, Nov 28

South America

• 2026-11-07 | Planalto Paulista, BR | Rust São Paulo Meetup
  • Encontro do Rust-SP - Agora no Luma

Oceania:

• 2026-11-24 | Barton, AU | Canberra Rust User Group
  • November Meetup

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

Think about how your contributions may be received before you send them. This kind of thought, true thought, with real emotion and reasoning, is the only thing that you, a human, are guaranteed to be able to contribute.

- Jubilee on rust-users

Thanks to Jonas Fassbender for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by:

• nellshamrell
• llogiq
• ericseppanen
• extrawurst
• U007D
• mariannegoldin
• bdillo
• opeolluwa
• bnchi
• KannanPalani57
• tzilist

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

04 Nov 2026 5:00am GMT

Github Link

The following changes have been pushed to bugzilla.mozilla.org:

• Bug 2087000 - Sometimes phab "last modified" timestamp updates without actual changes to the revision
• Bug 2081860 - Migrate Bug REST resource to native Mojo API: bug objects (get, search, create, update, possible_duplicates, history)
• Bug 2070239 - Add DB-backed tests for flag-event bugmail recipient selection (prev-status tie-break, flag-type cc_list)
• Bug 2082543 - Clean up after the REST-to-Mojo migration: shared helpers in Bugzilla::API::V1::Util

Discuss these changes in the BMO Matrix Room

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03 Nov 2026 10:05pm GMT