This Week in Rust 340

Hello and welcome to another issue ofThis Week in Rust!Rustis a systems language pursuing the trifecta: safety, concurrency, and speed.This is a weekly summary of its progress and community.Want something mentioned? Tweet us at@ThisWeekInRustorsend us a pull request.Want to get involved?We love contributions.

This Week in Rustis openly developedon GitHub.If you find any errors in this week's issue,please submit a PR.

Check outthis week'sThis Week in Rust Podcast

Updates from Rust Community

News & Blog Posts

• Compiling Rust binaries for Windows 98 SE and more: a journey
• Zero To Production #0: Foreword
• Some Extensive Projects Working with Rust
• Writing Python inside your Rust code — Part 4
• Drawing SVG Graphics with Rust
• Designing the Rust Unleash API Client
• Conway's Game of Life on the NES in Rust
• How to organize your Rust tests
• Just: How I Organize Large Rust Programs
• Integrating Qt events into Actix and Rust
• Actix-Web in Docker: How to build small and secure images
• Angular, Rust, WebAssembly, Node.js, Serverless, and... the NEW Azure Static Web Apps!
• The Chromium project finds that around 70% of our serious security bugs are memory safety problems
• Integration of AV-Metrics Into rav1e, the AV1 Encoder
• Oxidizing the technical interview
• Porting K-D Forests to Rust
• Rust Macro Rules in Practice
• Rust: Dropping heavy things in another thread can make your code 10000 times faster
• Rust's Runtime
• [audio]Tech Except!ons: What Microsoft has to do with Rust? With Ryan Levick
• [video] [Russian]Rust: Not as hard as you think - Meta/conf: Backend Meetup 2020
• [video]3 Part Video for Beginners to Rust Programming on Iteration
• [video]Bringing WebAssembly outside the web with WASI by Lin Clark
• [video]Microsoft's Safe Systems Programming Languages Effort
• [video]Rust, WebAssembly, and the future of Serverless by Steve Klabnik

Crate of the Week

This week's crate iscargo-asm, a cargo subcommand to show the resulting assembly of a function. Useful for performance work.

Thanks toTrevor Spiterifor the suggestion!

Submit your suggestions and votes for next week!

Call for Participation

Always wanted to contribute to open-source projects but didn't 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.

• pijama: easy issues
• mdbx-rs: Add support for more compile time options
• ruma: Replace impl_enum! with strum derives
• time-rs: Revamped parsing/formatting
• http-types: Request::query should match Tide's behavior
• http-types: Status should take TryInto
• http-types: Expose method shorthands for Request constructor

If you are a Rust project owner and are looking for contributors, please submit taskshere.

Updates from Rust Core

359 pull requests weremerged in the last week

• update to LLVM 10
• llvm: expose tiny code model to users
• enable ARM TME (Transactional Memory Extensions)
• implement newasm!syntaxfromRFC #2850
• always generated object code for#![no_builtins]
• break tokens before checking if they are 'probably equal'
• emit a better diagnostic when function actually has a 'self' parameter
• stabilize fn-like proc macros in expression, pattern and statement positions
• useonce_cellcrate instead of custom data structure
• simple NRVO
• remove ReScope
• exhaustively checkty::Kindduring structural match checking
• move borrow-of-packed-field unsafety check out of loop
• fixInlineAsmOperandexpresions being visited twice during liveness checking
• chalk: cleanup crate structure and add features for SLG/recursive solvers
• check non-Send/Syncupvars captured by generator
• support coercion betweenFnDefand arg-less closure and vice versa
• more lazy normalization of constants
• miri: prepare Dlsym system for dynamic symbols on Windows
• useT's discriminant type inmem::Discriminant<T>instead ofu64
• fix discriminant type in generator transform
• impl From<Cow>forBox,Rc, andArc
• another attempt to reducesize_of<HashMap>
• set initial non-emptyVecsize to 4 instead of 1
• makestd::charfunctions and constants associated tochar
• stabilizesaturating_absandsaturating_neg
• addlenandslice_from_raw_partstoNonNull<[T]>
• add fast-path optimization forIpv4Addr::fmt
• impl Ord for proc_macro::LineColumn
• cargo: try installing exact versions before updating
• cargo: automatically updatepatch, and provide better errors if an update is not possible
• cargo: add option to strip binaries
• rustfmt: merge configs from parent directories
• rustfmt: umprove error message when module resolution failed
• rustfmt: parse comma-separated branches in macro definitions

Approved RFCs

Changes to Rust follow the RustRFC (request for comments) process. Theseare the RFCs that were approved for implementation this week:

No RFCs were approved last week.

Final Comment Period

Every weekthe teamannounces the'final comment period' for RFCs and key PRs which are reaching adecision. Express your opinions now.

RFCs

No RFCs are currently in the final comment period.

Tracking Issues & PRs

• [disposition: merge]Tracking issue forstd::io::{BufReader, BufWriter}::capacity
• [disposition: merge]implFrom<[T; N]>forBox<[T]>
• [disposition: merge]Implement PartialOrd and Ord for SocketAddr*
• [disposition: merge]Stabilize AtomicN::fetch_min and AtomicN::fetch_max
• [disposition: merge]Resolve overflow behavior for RangeFrom
• [disposition: merge]impl Step for char (makeRange*<char>iterable)
• [disposition: merge]Stabilize core::panic::Location::caller
• [disposition: merge]Stabilize str_strip feature

New RFCs

No new RFCs were proposed this week.

Upcoming Events

Online

• May 27. Montréal, QC, CA - Remote - RustMTL May 2020
• May 27. Wrocław, PL - Remote - Rust Wrocław Meetup #20
• May 27. London, UK - Remote - LDN Talks May 2020
• May 28. Berlin, DE - Remote - Rust Hack and Learn
• June 3. Johannesburg, ZA - Remote - Johannesburg Rust Meetup
• June 8. Auckland, NZ - Remote - Rust AKL
• June 9. Seattle, WA - Remote - Seattle Rust Meetup

North America

• June 3. Indianapolis, IN, US - Indy.rs Meetup

If you are running a Rust event please add it to thecalendarto getit mentioned here. Please remember to add a link to the event too.Email theRust Community Teamfor access.

Rust Jobs

Tweet us at@ThisWeekInRustto get your job offers listed here!

• Rust Back End Engineer, Core Banking - TrueLayer - Milan, Italy
• Sr. SW Engineer (TW or Remote) - NZXT - Taipei, Taiwan
• Rust Graphics Engineer - Elektron - Gotheburg, Sweden

Quote of the Week

Things that are programming patterns in C are types in Rust.

–Kornel Lesiński on rust-users

Thanks totrentjfor the suggestions!

Please submit quotes and vote for next week!

This Week in Rust is edited by:nellshamrell,llogiq, andcdmistman.

Discuss on r/rust.