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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Updates from Rust Community
Official
Announcing async fn and return-position impl Trait in traits
Rustc Trait System Refactor Initiative Update: A call for testing
Foundation
Improving Supply Chain Security for Rust Through Artifact Signing
Project/Tooling Updates
2023: Slint in Review
Introducing Loco: The Rails of Rust
Observations/Thoughts
My path to becoming a Rustacean
Memory Safety is a Red Herring
The Most Common Rust Compiler Errors as Encountered in RustRover: Part 2
My reference was dropped, why is the compiler complaining about multiple borrows?
Can CppRef be ergonomic?
[video] Rust 1.74.1 & Rust News
Rust Walkthroughs
The dark side of inlining and monomorphization
The Heart of a Language Server
Rust: Multi threading
[series] Meilisearch Expands Search Power with Arroy's Filtered Disk ANN
Encrypted Portals between Macs – built in Rust and Swift (sorta similar to ngrok and tailscale)
[video] Error handling in Rust
Miscellaneous
An anonymous survey about mutable statics
Web development in Rust
Rocket: Web-based Hello World! with tests
Crate of the Week
This week's crate is rouille, a small synchronous web framework.
Thanks to [Peter Puetz](https://users.rust-lang.org/t/crate-of-the-week/2704/1275 for the suggestion!
Please submit your suggestions and votes for next week!
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.
greptimedb - Add more tables into information_schema for better compatibility
Ockam - Check that the bootstrap_server command argument is a valid host:port
Ockam - Refactor to use typed interfaces
Ockam - Check structs comply with the cddl schema
If you are a Rust project owner and are looking for contributors, please submit tasks here.
CFP - Speakers
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.
No new calls for speakers this week
If you are an event organizer hoping to expand the reach of your event, please submit a link to the submission website either through a PR to TWiR or on the [Rust-lang forums].[link TBD]
Updates from the Rust Project
268 pull requests were merged in the last week
add support for for await loops
add illumos aarch64 target for rust
add support for hexagon-unknown-none-elf as target
-Znext-solver: adapt overflow rules to avoid breakage
rustc_codegen_ssa: Don't drop IncorrectCguReuseType , make rustc_expected_cgu_reuse attr work
subtype_predicate: remove unnecessary probe
add check for possible CStr literals in pre-2021
add method to get instance instantiation arguments
add missing feature gate for sanitizer CFI cfgs
avoid redundant Option for cross_crate_inlinable
coverage: check for async fn explicitly, without needing a heuristic
do not allow ABI mismatches inside repr(C) types
do not fetch HIR in inferred_outlives_of
emit better suggestions for &T == T and T == &T
emits error if has bound regions
encode CoroutineKind directly
exhaustiveness: improve complexity on some wide matches
exhaustiveness: keep the original thir::Pat around
exhaustiveness: reveal empty opaques in depth
exhaustiveness: reveal opaque types properly
fallback default to None during ast-lowering for lifetime binder
fix ICE when using raw ptr in a pattern
fix crash due to CrateItem::kind() not handling constructors
give temporaries in if let guards correct scopes
make soft_unstable show up in future breakage reports
make closures carry their own ClosureKind
mark ty::Const::Error when meet unsupport ty for const generic params
pass DeadItem and lint as consistent group in dead-code
remove DiagCtxt API duplication
remove metadata decoding DefPathHash cache
resolve: eagerly feed closure visibilities
resolve: feed visibilities for unresolved trait impl items
resolve: stop feeding visibilities for import list stems
rework -Zverbose
simple modification of non_lifetime_binders's diagnostic information to adapt to type binders
skip duplicate stable crate ID encoding into metadata
split coroutine desugaring kind from source
subtree sync for rustc_codegen_cranelift
suggest = to == in more cases, even in the face of reference mismatch
add function ABI and type layout to StableMIR
separate MIR lints from validation
miri: implement and test simd_masked_load and simd_masked_store
improve coding efficiency for RawDefId
use Vec for region constraints instead of BTreeMap
stabilize file_create_new
stabilize ip_in_core feature
add more niches to rawvec
add IntoAsyncIterator
add hint::assert_unchecked
cargo: extend the build directive syntax with cargo::
cargo: hold the mutate exclusive lock when vendoring
cargo: refactor: centralize git checkouts and db paths
cargo: refactor: custom error types for cargo-util-schemas
cargo: rework --check-cfg generation comment
rustdoc: Add is_object_safe information for traits in JSON output
rustdoc: fix display of warning block if it is first element of the top doc block
clippy: question_mark: also trigger on return statements
clippy: check whether out of bound when access a known length array with a constant index
clippy: do not consider async { (impl IntoFuture).await } as redundant
clippy: extend UNNECESSARY_TO_OWNED to handle split
clippy: move uninhabited_references to nursery
clippy: new lints iter_filter_is_some and iter_filter_is_ok
clippy: stop bool_comparison's suggestion from consuming parentheses
rust-analyzer: complete exported macros in #[macro_use($0)]
rust-analyzer: implement a rust-analyzer span backed proc-macro server mode
rust-analyzer: auto remove unnecessary braces after remove unused imports
rust-analyzer: correctly set and mark the proc-macro spans
rust-analyzer: fix completions analysis not caching all nodes in Semantics
rust-analyzer: fix span marking for builtin fn macros
rust-analyzer: fully remove dummy spans
rust-analyzer: remove wrong comma after remove unnecessary braces
Rust Compiler Performance Triage
Some of the recent noise swings have been appearing again this week, but luckily
less often than before. There were a few actual regressions, but most of them
were localized to a single stress test. On the other hand, there were a few very
nice wins across the board, especially for check and incremental builds, primarily
thanks to #118824 and
#119265.
Triage done by @kobzol.
Revision range: bf9229a2e366b4c311f059014a4aa08af16de5d8..1ab783112ab4e4807304dbd249b39771246013ef
Summary:
(instructions:u)
mean
range
count
Regressions ❌
(primary)
0.6%
[0.6%, 0.6%]
1
Regressions ❌
(secondary)
2.5%
[0.3%, 4.2%]
10
Improvements ✅
(primary)
-0.8%
[-3.3%, -0.1%]
180
Improvements ✅
(secondary)
-1.2%
[-5.5%, -0.2%]
109
All ❌✅ (primary)
-0.8%
[-3.3%, 0.6%]
181
5 Regressions, 7 Improvements, 2 Mixed; 1 of them in rollups
58 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
No RFCs entered Final Comment Period this week.
Tracking Issues & PRs
[disposition: merge] Use version-sorting for all sorting
[disposition: merge] Tracking issue for exclusive range patterns
[disposition: merge] rustdoc: clean up source sidebar hide button
Language Reference
No Language Reference RFCs entered Final Comment Period this week.
Unsafe Code Guidelines
No Unsafe Code Guideline RFCs entered Final Comment Period this week.
New and Updated RFCs
RFC: Allow type inference for const or static
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.
Upcoming Events
Rusty Events between 2023-12-27 - 2024-01-24 �
Virtual
2023-12-28 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
Crafting Interpreters in Rust Collaboratively
2024-01-03 | Virtual (Indianapolis, IN, US) | Indy Rust
Indy.rs - with Social Distancing
2024-01-09 | Virtual (Dallas, TX, US) | Dallas Rust
Last Tuesday
2024-01-11 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
Crafting Interpreters in Rust Collaboratively
2024-01-16 | Virtual (Washington, DC, US) | Rust DC
Mid-month Rustful
Europe
2023-12-27 | Copenhagen, DK | Copenhagen Rust Community
Rust hacknight #1: CLIs, TUIs and plushies
2023-12-28 | Vienna, AT | Rust Vienna
Rust Dojo 3: Holiday Edition
2024-01-11 | Reading, UK | Reading Rust Workshop
Reading Rust Meetup at Browns
2024-01-11 | Wrocław, PL | Rust Wrocław
Rust Meetup #36
2024-01-13 | Helsinki, FI | Finland Rust-lang Group
January Meetup
North America
2023-12-27 | Austin, TX, US | Rust ATX
Rust Lunch - Fareground
2024-01-06 | Boston, MA, US | Boston Rust Meetup
Beacon Hill Rust Lunch
2024-01-08 | Chicago, IL, US | Deep Dish Rust
Rust Hack Night
2024-01-09 | Seattle, WA, US | Cap Hill Rust Coding/Hacking/Learning
Rusty Coding/Hacking/Learning Night
2024-01-09 | Minneapolis, MN, US | Minneapolis Rust Meetup
Minneapolis Rust Meetup Happy Hour
2024-01-14 | Cambridge, MA, US | Boston Rust Meetup
Alewife Rust Lunch
2024-01-16 | San Francisco, CA, US | San Francisco Rust Study Group
Rust Hacking in Person
2024-01-17 | Chicago, IL, US | Deep Dish Rust
Rust Happy Hour
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
Rust can be rather more verbose than C; there are a lot of invariants that have to be expressed in the code. But that is countered by the need for far less error-handling code; it turns out to be a wash, with the size of the two implementations being about the same.
– Alice Ryhl at the Linux Plumbers Conference as quoted by Jonathan Corbet, LWN
Thanks to Ivan Fraixedes 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.
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