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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.
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This week's crate is httpmock, which is quite unsurprisingly a HTTP mocking library for Rust.
Thanks to Jacob Pratt for the suggestion!
Please submit your suggestions and votes for next week!
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 calls for testing were issued this week.
- No calls for testing were issued this week.
- 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.
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.
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!
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 X (formerly Twitter) or Mastodon!
498 pull requests were merged in the last week
- make
-O mean OptLevel::Aggressive
rustc_target: Add the fp16 target feature for AArch32- add x86-sse2 (32bit) ABI that requires SSE2 target feature
- add cygwin target
- HIR analysis: Remove unnecessary abstraction over list of clauses
- AIX: expect
EINVAL for pthread_mutex_destroy
abi_unsupported_vector_types: say which type is the probleminvalid_from_utf8[_unchecked]: also lint inherent methodstransmute should also assume non-null pointers- allow configuring jemalloc per target
- cast allocas to default address space
- change
swap_nonoverlapping from lang to library UB
- check sig for errors before checking for unconstrained anonymous lifetime
- check whole
Unsize predicate for escaping bound vars
- compiler: die immediately instead of handling unknown target codegen
- compiler: give
ExternAbi truly stable Hash and Ord
- compiler: replace
ExternAbi::name calls with formatters
- correctly escape hashtags when running
invalid_rust_codeblocks lint
- debuginfo: set bitwidth appropriately in
enum variant tags
- do not allow attributes on
struct field rest patterns
- eagerly prove WF when resolving fully qualified paths
- emit MIR for each bit with on
dont_reset_cast_kind_without_updating_operand
- explain that in paths generics can't be set on both the
enum and the variant
- fix
ensure_monomorphic_enough
- fix const items not being allowed to be called
r#move or r#static
- fix diagnostic when using = instead of : in let binding
- fix presentation of purely "additive" replacement suggestion parts
- i686-linux-android: increase CPU baseline to Pentium 4 (without an actual change
- ignore Self in bounds check for associated types with Self:Sized
- implement
supertrait_item_shadowing (v2) (RFC #3624)
- implement pattern type ffi checks
- improve host/cross target checking
- in "specify type" suggestion, skip type params that are already known
- load all builtin targets at once instead of one by one in check-cfg
- made
check_argument_compat public for use in miri
- mark condition/carry bit as clobbered in C-SKY inline assembly
- normalize closure instance before eagerly monomorphizing it
- overhaul
rustc_middle::limits
- overhaul how contracts are lowered on fn-like bodies
- parallel-compiler-related cleanup
- properly deeply normalize in the next solver
- reject
?Trait bounds in various places where we unconditionally warned since 1.0
- remove SSE ABI from i586-pc-windows-msvc
- remove the common prelude module
- replace some u64 hashes with Hash64
- resolve named regions when reporting type test failures in NLL
- rework
name_regions to not rely on reverse scc graph for non-member-constrain usages
- rework rigid alias handling
- set both
nuw and nsw in slice size calculation
- show supported register classes in error message
- try to recover from path sep error in type parsing
- unify LLVM version finding logic
- use
const_error! when possible
- use a trait to enforce field validity for union fields +
unsafe fields + unsafe<> binder types
- use the right binder for rebinding
PolyTraitRef
- valtree performance tuning
- miri: apply random float error
- miri: remove the build script for miri
- stabilize
NonZero::count_ones
- stabilize
const_is_char_boundary and const_str_split_at
- stabilize
get_many_mut as get_disjoint_mut
- stabilize
target_feature_11
- std: replace the
FromInner implementation for addresses with private conversion functions
- implement
Extend<AsciiChar> for String
- implement
f{16, 32, 64, 128}::{erf, erfc} under #![feature(float_erf)]
- implement
read*_exact for std:io::repeat
- use
slice::fill in io::Repeat implementation
- use
tell for <File as Seek>::stream_position
- restrict
DerefPure for Cow<T> impl to T = impl Clone, [impl Clone], str
- forward all default methods for I/O impls
- cargo: embedded: Handle more parsing corner cases
- cargo: embedded: Integrate cargo-script logic into main parser
- cargo: implement workspace feature unification
- cargo: util: provide a better error message for invalid SSH URLs
- rustdoc: only apply LTO to rustdoc at stage 2
- rustdoc: Move line numbers into the
<code> directly
- rustdoc: improve refdef handling in the unresolved link lint
- rustdoc: properly restore search input placeholder
- rustdoc: Fixed
Copy Item Path in rust doc
- rustdoc: do more lazy formatting in librustdoc 🦥
- rustdoc: nuke
Buffer abstraction from librustdoc, take 2 💣
- rustfmt: add option to control trailing zero in floating-point literals
- rustfmt: labels on the closure body block can be disappearing
- bindgen: distinguish
char16_t
- bindgen: report enums in ParseCallbacks
- clippy: new lint:
manual_contains
- clippy: new lint:
mem_replace_option_with_some
- clippy: new lint:
unbuffered_bytes
- clippy:
declare_interior_mutable_const, borrow_interior_mutable_const: resolve <T as Trait>::AssocT projections
- clippy:
doc_link_code: add check for links with code spans that render weird
- clippy:
just_underscores_and_digits: fix false positive in error recovery scenario
- clippy:
manual_ok_err: blockify the replacement of an else if …
- clippy:
unnecessary_map_or: do not consume the comparison value if it does not implement Copy
- clippy:
{expect,unwrap}_used: add options to lint at compilation time
- clippy: add
--allow-no-vcs to cargo dev dogfood --fix
- clippy: add index checks for the slice in
manual_slice_fill
- clippy: fix
literal_string_with_formatting_args lint emitted when it should not
- clippy: fix
used_underscore_items lint uses of foreign functions
- clippy: fix
needless_option_as_deref FP in trait
- rust-analyzer: add cargo's git checkouts to the list of paths to mark as read-only in vscode
- rust-analyzer: apply cfg.setTest to json projects
- rust-analyzer: feat: refactor path lowering and serve a new path diagnostic
- rust-analyzer: apply adjustments to proper expr when invoking
CoerceMany
- rust-analyzer: censor
cfg_attr for attribute macros
- rust-analyzer: do not show safety hints for extern items lacking semantics
- rust-analyzer: don't emit implicit drop inlay hints for macro
- rust-analyzer: don't show drop hints for other pattern
- rust-analyzer: fix detection of ref patterns for path patterns
- rust-analyzer: fix postfix completions inside macros
- rust-analyzer: fix sorting of runnables
- rust-analyzer: handle character boundary in search mode
- rust-analyzer: highlight
extern crate in doc comments
- rust-analyzer: improve sort order of runnables
- rust-analyzer: lower range pattern bounds to expressions
- rust-analyzer: make
rust-analyzer.files.excludeDirs work, actually
- rust-analyzer: propogate error types in mir type projections
- rust-analyzer: stabilize sort order of
related_tests
- rust-analyzer: implement
expand_glob_reexport assist
- rust-analyzer: improve error recovery when method-calling a field
- rust-analyzer: improve error recovery when method-calling an assoc function
- rust-analyzer: pass
struct fields to chalk
- rust-analyzer: simplify
panic_context
This week's results were dominated by the update to LLVM 20 (#135763),
which brought a large number of performance improvements, as usually. There were also two other
significant improvements, caused by improving the representation of const values (#136593) and doing less work when formatting in rustdoc (#136828).
Triage done by @kobzol.
Revision range: c03c38d5..ce36a966
Summary:
| (instructions:u) |
mean |
range |
count |
Regressions ❌
(primary) |
4.4% |
[0.2%, 35.8%] |
10 |
Regressions ❌
(secondary) |
1.2% |
[0.2%, 5.0%] |
13 |
Improvements ✅
(primary) |
-1.6% |
[-10.5%, -0.2%] |
256 |
Improvements ✅
(secondary) |
-1.0% |
[-4.7%, -0.2%] |
163 |
| All ❌✅ (primary) |
-1.3% |
[-10.5%, 35.8%] |
266 |
3 Regressions, 2 Improvements, 4 Mixed; 4 of them in rollups
50 artifact comparisons made in total
Full report here.
Changes to Rust follow the Rust RFC (request for comments) process. These
are the RFCs that were approved for implementation this week:
Every week, the team announces the 'final comment period' for RFCs and key PRs
which are reaching a decision. Express your opinions now.
- No RFCs entered Final Comment Period this week.
- No Cargo Tracking Issues or PRs entered Final Comment Period this week.
- No Language Team Proposals entered Final Comment Period this week.
- No Language Reference RFCs entered Final Comment Period this week.
- No Unsafe Code Guideline Tracking Issues or PRs entered Final Comment Period this week.
Rusty Events between 2025-02-19 - 2025-03-19 🦀
- 2025-02-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust
- 2025-02-20 | Hybrid (Redmond, WA, US) | Seattle Rust User Group
- 2025-02-21 | Virtual (Jersey City, NJ, US) | Jersey City Classy and Curious Coders Club Cooperative
- 2025-02-25 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- 2025-02-25 | Virtual (London, UK) | Women in Rust
- 2025-02-25 | Virtual (Washington, DC, US) | Rust DC
- 2025-02-27 | Virtual (US) | Ardan Labs
- 2025-02-27 | Virtual (Berlin, DE) | Rust Berlin
- 2025-02-27 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
- 2025-03-01 | Virtual (Kampala, UG) | Rust Circle Kampala
- 2025-03-04 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
- 2025-03-05 | Virtual (Indianapolis, IN, US) | Indy Rust
- 2025-03-06 | Virtual (Nürnberg, DE) | Rust Nurnberg DE
- 2025-03-06 | Virtual (Rotterdam, NL) | Bevy Game Development
- 2025-03-06 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
- 2025-03-09 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
- 2025-03-11 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- 2025-03-11 | Virtual (London, UK) | Women in Rust
- 2025-03-13 | Virtual (Berlin, DE) | Rust Berlin
- 2025-03-18 | Virtual (Washington, DC, US) | Rust DC
- 2025-03-18 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
- 2025-03-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust
- 2025-02-19 - 2025-02-20 | London, UK | Rust Nation UK
- 2025-02-20 | Bern, CH | Rust Bern
- 2025-02-21 | London, UK | Rust Global: London 2025
- 2025-02-22 | Stockholm, SE | Stockholm Rust
- 2025-02-25 | Madrid, ES | MadRust
- 2025-02-26 | Darmstadt, DE | Rust Rhein Main
- 2025-02-27 | Oslo, NO | Rust Oslo
- 2025-02-27 | Paris, FR | Rust Paris
- 2025-03-01 | Nürnberg, DE | Rust Nuremberg
- 2025-03-05 | Barcelona, ES | BcnRust
- 2025-03-07 | Prague, CZ | Rust Czech Republic
- 2025-03-12 | Reading, UK | Reading Rust Workshop
- 2025-03-12 | Reading, UK | Reading Rust Workshop
- 2025-03-13 | Biel, CH | Rust Bern
- 2025-03-14 | Paris, FR | Rust in Paris
- 2025-03-18 | Basel, CH | Rust Basel
- 2025-03-18 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
- 2025-02-20 | Chicago, IL, US | Chicago Rust Meetup
- 2025-02-20 | Nashville, TN, US | Music City Rust Developers
- 2025-02-20 | Redmond, WA, US | Seattle Rust User Group
- 2025-02-20 | Spokane, WA, US | Spokane Rust
- 2025-02-21 | México City, MX | Rust MX
- 2025-02-22 | Boston, MA, US | Boston Rust Meetup
- 2025-02-26 | Austin, TX, US | Rust ATX
- 2025-02-27 | Atlanta, GA, US | Rust Atlanta
- 2025-03-02 | Boston, MA, US | Boston Rust Meetup
- 2025-03-06 | Saint Louis, MO, US | STL Rust
- 2025-03-10 | Boston, MA, US | Boston Rust Meetup
- 2025-03-18 | San Francisco, CA, US | San Francisco Rust Study Group
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.
Please see the latest Who's Hiring thread on r/rust
I have found that many automated code review tools, including LLMs, catch 10 out of 3 bugs.
– Josh Triplett on r/rust
Despite a lamentable lack of suggestions, llogiq is properly pleased with his choice.
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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