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+Title: This Week in Rust 279
+Number: 279
+Date: 2019-03-26
+Category: This Week in Rust
+
+Hello and welcome to another issue of *This Week in Rust*!
+[Rust](http://rust-lang.org) is 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 [@ThisWeekInRust](https://twitter.com/ThisWeekInRust) or [send us a pull request](https://github.com/cmr/this-week-in-rust).
+Want to get involved? [We love contributions](https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md).
+
+*This Week in Rust* is openly developed [on GitHub](https://github.com/cmr/this-week-in-rust).
+If you find any errors in this week's issue, [please submit a PR](https://github.com/cmr/this-week-in-rust/pulls).
+
+# Updates from Rust Community
+
+## News & Blog Posts
+
+* [Why Hashbrown (Rust's new HashMap implementation) does a double-lookup on insertion](https://gankro.github.io/blah/hashbrown-insert/).
+* [Chaining functions without returning self](https://randompoison.github.io/posts/returning-self/).
+* ["Learning Rust With Entirely Too Many Linked Lists" has been updated for Rust 2018](https://rust-unofficial.github.io/too-many-lists/).
+* [Miri available as rustup component](https://www.ralfj.de/blog/2019/03/26/miri-as-rustup-component.html).
+* [How to debug Rust with Visual Studio Code](https://www.forrestthewoods.com/blog/how-to-debug-rust-with-visual-studio-code/).
+* [Rust: The hard parts - part one: References, borrowing, and ownership](https://naftuli.wtf/2019/03/20/rust-the-hard-parts/).
+* [Procedural macro in Rust 101](https://dev.to/naufraghi/procedural-macro-in-rust-101-k3f).
+* [Generalizing seqlocks: The swym algorithm](https://mtak-blog.github.io/generalizing-seqlocks).
+* [The phantom builder](https://wiredforge.com/blog/phantom-builder/index.html).
+* [Variance in Rust: An intuitive explanation](https://ehsanmkermani.com/2019/03/16/variance-in-rust-an-intuitive-explanation/).
+* [Rust All Hands 2019: Array iterators, Rayon, and more](https://developers.redhat.com/blog/2019/03/22/rust-all-hands-2019-array-iterators-rayon-and-more/).
+* [This week in Rust and WebAssembly 14](https://rustwasm.github.io/2019/03/21/this-week-in-rust-and-wasm-014.html).
+* [The Embedded WG newsletter 17](https://rust-embedded.github.io/blog/newsletter-17/).
+
+# Crate of the Week
+
+This week's crate is [safety-guard](https://gitlab.com/tdiekmann/safety-guard), a crate providing a `#[safety]` attribute that generates both a doc entry and debug assertion. Thanks to [Willi Kappler](https://users.rust-lang.org/t/crate-of-the-week/2704/506) for the suggestion!
+
+[Submit your suggestions and votes for next week][submit_crate]!
+
+[submit_crate]: https://users.rust-lang.org/t/crate-of-the-week/2704
+
+# 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.
+
+* [Call for proposal - RustLab 2019, June 28-29, Florence, IT](https://www.rustlab.it/page/1398227/call-for-proposal).
+* [Tools Team: tell us your sorrows](https://internals.rust-lang.org/t/tools-team-tell-us-your-sorrows/9657).
+* [grpc-rs: Add support for well-known types](https://github.com/pingcap/grpc-rs/issues/276).
+* [TiKV: Flush logs on fatal errors](https://github.com/tikv/tikv/issues/4328).
+* [TiKV: Disable test suites that contain no tests](https://github.com/tikv/tikv/issues/4391).
+* [GNOME Google Summer of Code](https://twitter.com/sdroege_/status/1109135842793148419): couple of Rust-related ideas lined up for this year's GSOC. From low-level libraries like Gstreamer, and Librsvg, to system services, to desktop applications. More details can be found by searching [this wiki page](https://wiki.gnome.org/Outreach/SummerOfCode/2019/Ideas).
+
+If you are a Rust project owner and are looking for contributors, please submit tasks [here][guidelines].
+
+[guidelines]: https://users.rust-lang.org/t/twir-call-for-participation/4821
+
+# Updates from Rust Core
+
+169 pull requests were [merged in the last week][merged]
+
+[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-03-18..2019-03-25
+
+* [Move libtest out of rust-lang/rust](https://github.com/rust-lang/rust/pull/57842)
+* [Introduce assembly tests suite](https://github.com/rust-lang/rust/pull/58791)
+* [syntax: Better recovery for `$ty::AssocItem` and `ty!()::AssocItem`](https://github.com/rust-lang/rust/pull/59058)
+* [MIR optimization: Run branch cleanup after copy propagation](https://github.com/rust-lang/rust/pull/59290)
+* [Do not complain about non-existing fields after parse recovery](https://github.com/rust-lang/rust/pull/59266)
+* [Make meta-item API compatible with `LocalInternedString::get` soundness fix](https://github.com/rust-lang/rust/pull/59256)
+* [Use a valid name for graphviz graphs](https://github.com/rust-lang/rust/pull/59251)
+* [When moving out of a for loop head, suggest borrowing it](https://github.com/rust-lang/rust/pull/59195)
+* [When encountering `||{}()`, suggest the likely intended `(||{})()`](https://github.com/rust-lang/rust/pull/59035)
+* [Point at coercion reason for `if` expressions without else clause if caused by return type](https://github.com/rust-lang/rust/pull/58981)
+* [Elide object safety errors on non-existent trait function](https://github.com/rust-lang/rust/pull/58929)
+* [Unify `OsString`/`OsStr` for byte-based implementations](https://github.com/rust-lang/rust/pull/58953)
+* [Add provided methods `Seek::`{`stream_len`, `stream_position`}](https://github.com/rust-lang/rust/pull/58422)
+* [Add `todo!()` macro](https://github.com/rust-lang/rust/pull/56348)
+* [Implement `ExactSizeIterator` for `ToLowercase` and `ToUppercase`](https://github.com/rust-lang/rust/pull/58778)
+* [Make `Option<ThreadId>` no larger than `ThreadId` with `NonZeroU64`](https://github.com/rust-lang/rust/pull/59291)
+* [Stabilize `refcell_map_split` feature](https://github.com/rust-lang/rust/pull/59280)
+* [Add const generics to rustdoc](https://github.com/rust-lang/rust/pull/59170)
+* [crates.io: Allow download counts to fail to be updated](https://github.com/rust-lang/crates.io/pull/1675)
+
+## Approved RFCs
+
+Changes to Rust follow the Rust [RFC (request for comments)
+process](https://github.com/rust-lang/rfcs#rust-rfcs). These
+are the RFCs that were approved for implementation this week:
+
+*No RFCs were approved this week.*
+
+## Final Comment Period
+
+Every week [the team](https://www.rust-lang.org/team.html) announces the
+'final comment period' for RFCs and key PRs which are reaching a
+decision. Express your opinions now.
+
+### [RFCs](https://github.com/rust-lang/rfcs/labels/final-comment-period)
+
+* [disposition: merge] [Roadmap for 2019](https://github.com/rust-lang/rfcs/pull/2657).
+* [disposition: merge] [Transparent Unions and Enums](https://github.com/rust-lang/rfcs/pull/2645).
+* [disposition: close] [`mut (x, y, ..)` and `mut [x, y, ..]` pattern shorthand](https://github.com/rust-lang/rfcs/pull/2401).
+
+### [Tracking Issues & PRs](https://github.com/rust-lang/rust/labels/final-comment-period)
+
+* [disposition: merge] [More restrictive 2 phase borrows - take 2](https://github.com/rust-lang/rust/pull/58739).
+* [disposition: merge] [Introduce RefCell::try_borrow_unguarded](https://github.com/rust-lang/rust/pull/59211).
+* [disposition: merge] [Tracking issue for {f32, f64}::copysign](https://github.com/rust-lang/rust/issues/58046).
+
+## New RFCs
+
+* [RFC for a match based surface syntax to get pointer-to-field](https://github.com/rust-lang/rfcs/pull/2666).
+
+# Upcoming Events
+
+### Africa
+
+* [Mar 30. Nairobi, KE - Rust Nairobi Meetup: Projects Showcase](https://www.meetup.com/Rust-Nairobi/events/259650701/).
+* [Apr  3. Johannesburg, ZA - Johannesburg meetup - using Rust in production](https://www.meetup.com/Johannesburg-Rust-Meetup/events/gpxrtqyzgbfb/).
+
+### Asia Pacific
+
+* [Mar 29. Noida, IN - Fearless Concurrency in Rust - Knoldus Meetup](https://www.meetup.com/Reactive-Application-Programmers-in-Delhi-NCR/events/259722745/).
+* [Mar 30. Taipei, TW - Rust Taiwan Meetup](https://www.facebook.com/events/431401857668601/).
+* [Apr 20. Beijing, CN - RustCon Asia](https://rustcon.asia/).
+
+### Europe
+
+* [Mar 28. Copenhagen, DK - Copenhagen Rust Hack Night #14](https://cph.rs/).
+* [Mar 28. Toulouse, FR - Rust Toulouse meetup](https://www.meetup.com/fr-FR/Toulouse-Rust-Meetup/events/259589986/).
+* [Mar 31. St. Petersburg, RU - St. Petersburg Rust Meetup](https://www.meetup.com/spbrust/events/whmxrqyzfbpc).
+* [Apr  3. Berlin, DE - Berlin Rust Hack and Learn](https://www.meetup.com/opentechschool-berlin/events/gkkttqyzgbfb/).
+* [Apr  4. Zagreb, HR - Rust Meetup 201904: Persistent data in Rust](https://www.meetup.com/Zagreb-Rust-Meetup/events/259597646/).
+* [Apr 04. Wroclaw, PL - Rust Wroclaw Meetup](https://www.meetup.com/Rust-Wroclaw/events/259511136/).
+* [Apr 13. Kyiv, UA - PeerLab Kyiv #NativeDev: Rust 1.34 Release in Depth](https://www.meetup.com/PeerLab-Native-Developers/events/260050471/).
+* [Jun 28-29. Firenze, IT - RustLab](https://www.rustlab.it/).
+
+### North America
+
+* [Apr  3. Indianapolis, US - Indy.rs](https://www.meetup.com/indyrs/events/246726699/).
+* [Apr  3. Atlanta, US - Rust Atlanta Meetup](https://www.meetup.com/Rust-ATL/events/lgtvsqyzgbfb/).
+* [Apr  3. Vancouver, CA - Vancouver Rust meetup](https://www.meetup.com/Vancouver-Rust/events/gqbksqyzgbfb/).
+* [Apr  9. Seattle, US - Seattle Rust Meetup - Monthly meetup](https://www.meetup.com/Seattle-Rust-Meetup/events/nzfspqyzgbmb/).
+* [Apr 11. Arlington, US - Rust DC — Mid-month Rustful](https://www.meetup.com/RustDC/events/259782531).
+* [Apr 11. Columbus, US - Columbus Rust Society - Monthly Meeting](https://www.meetup.com/columbus-rs/events/dbcfrpyzgbpb/).
+
+### South America
+
+* [Mar 29. Montevideo, UY - Rust Latam @ Montevideo, Uruguay](https://rustlatam.org/).
+
+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][community] for access.
+
+[calendar]: https://www.google.com/calendar/embed?src=apd9vmbc22egenmtu5l6c5jbfc%40group.calendar.google.com
+[community]: mailto:community-team@rust-lang.org
+
+# Rust Jobs
+
+* [WebAssembly / Cranelift Intern (Summer 2019) at Mozilla, San Francisco, US](https://careers.mozilla.org/position/gh/1501382/).
+* [Senior Software Engineer at Metaswitch, North London, UK](https://www.metaswitch.com/careers-blog/senior-software-engineer-enfield).
+* [Lead Engineer (Cryptography) at Cosmian, Paris, FR](https://cosmian.com/wp-content/uploads/2019/03/Rust-CPP-lead-engineer.pdf).
+* [Database Engineer Developer at Parity, Berlin, DE](https://www.parity.io/jobs/#berlin-database-engine-developer).
+* [Rust Software Consultant at Knoldus, Noida, IN](https://www.knoldus.com/careers/rust-software-consultant.knol).
+
+*Tweet us at [@ThisWeekInRust](https://twitter.com/ThisWeekInRust) to get your job offers listed here!*
+
+# Quote of the Week
+
+> all the ergonomic improvements in rust 2018 are really messing up my book that consists entirely of running face-first into compiler errors so i can explain concepts.
+
+– Alexis Beingessner, author of “Learning Rust With Entirely Too Many Linked Lists”
+
+Thanks to [icefoxen](https://users.rust-lang.org/t/twir-quote-of-the-week/328/631) for the suggestion!
+
+[Please submit your quotes for next week](http://users.rust-lang.org/t/twir-quote-of-the-week/328)!
+
+*This Week in Rust is edited by: [nasa42](https://github.com/nasa42), [llogiq](https://github.com/llogiq), and [Flavsditz](https://github.com/Flavsditz).*
+
+<small>[Discuss on r/rust]().</small>