fidzu : thunderbird

Github Link

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

• Bug 2064523 - [meta] tracking bug for BMO dependency upgrades
• Bug 2081849 - Migrate Bug REST resource to native Mojo API: field metadata (fields, legal_values, flag_types)
• Bug 2082654 - 2_test_flags2.t picks a component before the bug page has loaded the new product's components
• Bug 2083156 - Add an alert for excessive lag in the phab-bot feed processing queue
• Bug 2083532 - Webhook bug.modify payload has empty bug.flags when flags are set at bug creation
• Bug 2020752 - [PHABBUGZ] Improve testing of phabricator and bmo integration
• Bug 2079840 - allow @username in the textarea like github
• Bug 2081859 - Migrate Bug REST resource to native Mojo API: comments (comments, add_comment, render_comment, reactions, tags)
• Bug 2078770 - Migrate User REST resource to native Mojo API: MFA (enroll, verify_totp_code)

Discuss these changes in the BMO Matrix Room

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21 Oct 2026 10:23pm GMT

The latest version of PerfCompare is now live!

Check out the change-log below to see the updates:

[kala-moz]:

• Bug 2058236: Show a notice when column filters hide result rows

• Bug: 2075044 Significance filter and sort selections don't persist

[gopar]:

• Bug-2039589 - Add caching to ttest/mwu views

• Bug 1846013 Add ability to display multiple framework results

• Bug-1941337 - Add new formatter for delta values

[moijes]

• Bug-1982588: Align breadcrumbs and replicates button in Subtests View

Thank you for the contributions!

Bugs or feature requests can be filed on Bugzilla. The team can also be found on the #perfcompare channel on Matrix. Come and chat!

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21 Oct 2026 3:20pm 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

• Announcing Rust 1.99.1
• Announcing the GPU notification group and Linker Working Area

Newsletters

• Rust Trends Issue 85 - If It Compiles, the Agent Got It Right

Project/Tooling Updates

• Introducing tsrs: a Port of TypeScript to Rust

Observations/Thoughts

• Cloudflare is rewriting everything in Rust
• What agents mean for Rust (and vice versa)
• Black-Box HashDoS: Attacking Hash Tables Without Knowing the Hash Function
• 2026 is an exciting year for the Rust compiler (and me)
• What the crates.io download count really measures: 90 days of daily data from 69 crates
• Safe self-referential data structures in kernel Rust
• Cross-crate forward declarations in Rust
• Why tellus message handlers are synchronous
• Upstreaming Tyr: Rust, DRM, and the Linux Kernel

Rust Walkthroughs

• I forced a speech model onto the GPU for months. The CPU was faster.
• Superoptimizing an FPU emulator
• Draw and Animate Loading Spinner with GPUI
• [series] Encoding TCP in Rust's Type System, Part 1: A Sequence Number Is Not a u32
• [series] Running 10 million Codex CLIs on one server - LFI processes

Research

• An Incremental Approach to JIT Construction
• [video] [Scheme'26] An Incremental Approach to JIT Construction

Miscellaneous

Crate of the Week

This week's crate is eilmeldung, a TUI RSS reader.

llogiq is pretty pleased with his choice, despite a lamentable lack of suggestions.

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.

ScreenCue

• ScreenCue - Add a reproducible desktop bug-report issue form

sysknife

• sysknife - README says the CLI's approval gate is sysknife approve; the CLI approves in-process after its own prompt
• sysknife - --dry-run exits 0 for a plan that breaks --max-risk or that this distro cannot run
• sysknife - Re-running sysknife-setup while the daemon runs fails with ETXTBSY and can leave mismatched binaries

Manguebyte

• Manguebyte - Put ParamSmoother under the allocation guard
• Manguebyte - Treat a NaN delay as the shortest delay in DelayLine::read and Delay::set_time
• Manguebyte - Check security advisories in the cargo deny job
• Manguebyte - Let a plugin report its tail to hosts
• Manguebyte - Add audio widgets, starting with an on-screen keyboard

krate

• krate - Fix two warnings on the wasm32 and Windows targets (easy)
• krate - Linux: follow the person's dark mode and text size (medium)
• krate - krate pack: add a --keep-debug flag (medium)

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.

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

601 pull requests were merged in the last week

Compiler

• improve diagnostic for literals in lint attributes
• improve diagnostics for non-well-formed associated items
• fix diagnostic::on_unknown format placeholder for paths in expressions and type paths
• move fully_perform early return earlier
• overhaul span compression
• perf: drop error in unwrap_failed instead of unwrap
• port lint attributes
• provide context span pointing at trait/item when talking about assoc items
• restore the old behavior for derive(Default) on fieldless types
• skip move checks when the size limit is zero
• stabilize -Zembed-metadata
• support function args const generics

Library

• add codeview_annotation intrinsic
• add core::process::resumable_breakpoint
• make std::fs::{File, ReadDir, DirEntry} always needs_drop even when unsupported
• make tuple PartialOrd chaining easier on mir-opt
• windows: stabilise inherit_handles

Cargo

• build-std: Add build.build-std.when and crates config keys
• prerelease: support [patch] with -Zprerelease
• config: Apply dotted tuple support for rustflags
• config: Don't load registry config from credentials.toml
• fingerprint: choose a stable path when source mtimes tie
• util-schemas: compile out the file-path hint where url can't build it
• shell completion show all the packages having the feature
• check crate type when pruning -L paths

Rustfmt

• config: fix lookup of global config files
• don't remove empty generic args when formatting in a macro context
• enforce comment width in item lists
• fix cfg_select! parser recovery handling and parser session error count leak
• fix statement comment wrapping
• prevent rustfmt from removing expression attrs when removing nested parens
• prevent rustfmt from removing necessary blocks in cfg_select! arms

Rustdoc

• add disambiguators for identically named method in sidebar
• improvements for rustc_must_implement_one_of

Clippy

• allow allow_attributes from inside macros
• bail all doc lints when attributes come from external macro expansion
• clear collection reassignment
• extend from_str_radix_10 to NonZero types
• fix try_from_instead_of_from_str lint suggestion causes error when TryFrom::try_from parameter is not named value
• fix wildcard_imports infinite loop on macro generated glob imports
• fix trailing semicolon with nonstandard_macro_braces
• new lint: bufreader_stdin
• useless_attribute: no longer lint clippy::allow_attributes

Rust-Analyzer

• viewMir panicking in code containing field projections
• bail out of struct_tail_erasing_lifetimes on infinite structs
• build non-ambiguous monikers in crates with multiple targets
• emit E0029 for range patterns with inferred invalid types
• escape keyword module name completions
• improve attribute completions without snippet
• ops: resolve ref-version-mismatch, stale-action-refs, and unpinned-uses

Rust Compiler Performance Triage

A week dominated by changes of small magnitude. However, a number of improvements landed that results in an overall average improvement of 1.4%, which is a quite nice to see.

Triage done by @simulacrum. Revision range: 7211ea59..bd4c6cc4

6 Regressions, 9 Improvements, 8 Mixed; 0 of them in rollups 43 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:

• Fix libs nominated triagebot.toml

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

• core: Add assert_matches and debug_assert_matches to the next prelude
• Lower #[no_mangle] to #[symbol_name]/#[link_name]
• stabilize String::into_chars
• stabilize {Rc, Arc}::is_unique
• vec: stabilise allocators for into_iter
• Don't require unsafe for struct and array patterns against union fields
• Add a future incompat warning for #[no_link]
• raise ambiguity error on attribute macro that could be tool attribute
• stabilize -Znext-solver=globally
• Stabilize --remap-path-scope in rustdoc and the documentation scope

Compiler Team (MCPs only)

• Add support for annotate-snippets's no-graphics output format

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

• Deprecate std::env::{vars, args}
• RFC: document a strict Future contract that forbids snoozing
• RFC: extern "Rust_manyregs" ABI
• RFC: add poll_progress to AsyncIterator

Upcoming Events

Rusty Events between 2026-10-21 - 2026-11-18 🦀

Virtual

• 2026-10-21 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2026-10-21 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Operating Systems Book Club: Paging Mechanisms
• 2026-10-22 | Virtual | Rust 🦀 Maven
  • Rust and the GPU from Native to Web: An Introduction to wgpu
• 2026-10-22 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-10-26 | Virtual | Rust 🦀 Maven
  • No Python was harmed: teaching a tiny MCU to learn as it goes
• 2026-10-27 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday Rust Bookclub
• 2026-10-27 | Virtual (London, UK) | Women in Rust
  • Lunch & Learn: Reasoning with Async Rust
• 2026-10-29 | Virtual | Rust 🦀 Maven
  • Creating a hexadecimal editor in Rust
• 2026-11-01 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: First Sunday
• 2026-11-03 | Virtual | Rust 🦀 Maven
  • Solving Real-World Planning Problems in Rust with SolverForge
• 2026-11-03 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 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

Asia

• 2026-11-03 | Tel Aviv-Yafo, IL | Rust 🦀 TLV
  • In person Rust November 2026 at AWS in Tel Aviv
• 2026-11-14 | Bengaluru, IN | Rust Bangalore
  • November 2026 Rustacean Meetup

Europe

• 2026-10-22 | Karlsruhe, DE | Rust Hack & Learn Karlsruhe
  • Karlsruhe Rust Hack and Learn Meetup bei BlueYonder
• 2026-10-22 | Toulouse, FR | Rust Toulouse
  • Rust Toulouse Meetup - Rust & Python interoperability
• 2026-10-27 | Aarhus, DK | Rust Aarhus
  • Hack Night: Rust meets AI
• 2026-10-27 | Paris, FR | Rust Paris
  • Rust meetup #89
• 2026-10-28 | Copenhagen, DK | Copenhagen Rust Community
  • Rust meetup #72 sponsored by Google!
• 2026-10-31 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #31
• 2026-11-01 - 2026-11-03 | Italy, IN | RustLab
  • RustLab - The International Conference on Rust in Italy
• 2026-11-04 | Dublin, IE | Rust Dublin
  • Rust 263: Getting Started with the New Rust Driver for Oracle AI Database
• 2026-11-05 | Milano, IT | Rust Language Milan
  • Digital Model Trains & Rust: Bare-Metal DCC Command Station on ESP32
• 2026-11-17 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Everlock: Everything Is Git, Protocols Are Just Adapters

North America

• 2026-10-21 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2026-10-21 | San Francisco, CA, US | Bay Area Rust
  • Bay Area Rust - Embedded Meetup
• 2026-10-22 | New York, NY, US | Rust NYC
  • Rust NYC w/Bryan Cantrill - Code Matters: Reflections on Rust in the LLM Age
• 2026-10-24 | Boston, MA, US | Boston Rust Meetup
  • Davis Square Rust Lunch, Oct 24
• 2026-10-28 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-10-31 | Boston, MA, US | Boston Rust Meetup
  • North End Rust Lunch, Oct 31
• 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](https://www.meetup.com/rust-montreal/events/316919004/](https://luma.com/iqe7wng1)
• 2026-11-05 | Saint Louis, MO, US | STL Rust
  • HTMX and Rust
• 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

South America

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

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

To me it seems the same things that make Rust a desirable target for LLM generated code are the same things that make it desirable for me as a human writing code, that being the fantastic compiler feedback and the first class tooling.

- Christian Haynes on rust-users

Thanks to Moy2010 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

21 Oct 2026 4:00am GMT