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+Title: This Week in Rust 280
+Number: 280
+Date: 2019-04-02
+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
+
+* [Five super helpful Rust things that nobody told you about](https://saghm.github.io/five-rust-things/).
+* [RaptorQ (RFC6330) and performance optimization in Rust](https://www.cberner.com/2019/03/30/raptorq-rfc6330-rust-optimization/).
+* [Idiomatic monads in Rust](https://varkor.github.io/blog/2019/03/28/idiomatic-monads-in-rust.html).
+* [BoringTun, a userspace WireGuard implementation in Rust](https://blog.cloudflare.com/boringtun-userspace-wireguard-rust/).
+* [Understanding futures in Rust - part 1](https://www.viget.com/articles/understanding-futures-in-rust-part-1/).
+* [Mocking in Rust with conditional compilation](https://klausi.github.io/rustnish/2019/03/31/mocking-in-rust-with-conditional-compilation.html).
+* [Face detection with Tensorflow Rust](https://cetra3.github.io/blog/face-detection-with-tensorflow-rust/).
+* [DSL in Rust: Challenges](https://blog.yoshuawuyts.com/2019-03-03-dsls-2/).
+* [Explained: How does async work in Rust](https://dev.to/gruberb/explained-how-does-async-work-in-rust-46f8)?
+* [This week in Rust and WebAssembly 15](https://rustwasm.github.io/2019/03/28/this-week-in-rust-and-wasm-015.html).
+
+# Crate of the Week
+
+This week's crate is [sonic](https://github.com/valeriansaliou/sonic), a fast, lightweight & schema-less search backend. Thanks to [Vikrant](https://users.rust-lang.org/t/crate-of-the-week/2704/509) 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.
+
+* [rust: Add rustc-guide to toolstate](https://github.com/rust-lang/rust/issues/59597).
+
+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
+
+251 pull requests were [merged in the last week][merged]
+
+[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-03-25..2019-04-01
+
+* [Add intial support for `wasm32-unknown-wasi`](https://github.com/rust-lang/libc/pull/1307)
+* [Allow closure to unsafe fn coercion](https://github.com/rust-lang/rust/pull/59580)
+* [Include bounds in generic re-ordering diagnostic](https://github.com/rust-lang/rust/pull/59572)
+* [Optimize indentation in the pretty printer](https://github.com/rust-lang/rust/pull/59507)
+* [Use `SmallVec` in `TokenStreamBuilder`](https://github.com/rust-lang/rust/pull/59476)
+* [Make ASCII case conversions more than 4× faster](https://github.com/rust-lang/rust/pull/59283)
+* [Adjust `MaybeUninit` API to discussions](https://github.com/rust-lang/rust/pull/59284)
+* [Introduce `proc_macro::Span::source_text`](https://github.com/rust-lang/rust/pull/55780)
+* [Add `Default` to `std::alloc::System`](https://github.com/rust-lang/rust/pull/59451)
+* [Add `FromStr` impl for `NonZero` types](https://github.com/rust-lang/rust/pull/58717)
+* [Implement `AsRawFd` for stdio locks](https://github.com/rust-lang/rust/pull/59512)
+* [Simplify `checked_duration_since`](https://github.com/rust-lang/rust/pull/59374)
+* [Stabilize `refcell_replace_swap`](https://github.com/rust-lang/rust/pull/59581)
+* [stabilize `ptr::hash`](https://github.com/rust-lang/rust/pull/59603)
+* [Stabilize {`f32`, `f64`}`::copysign()`](https://github.com/rust-lang/rust/pull/59503)
+* [cargo metadata: Don't show `null` deps](https://github.com/rust-lang/cargo/pull/6534)
+* [cargo install: Be more restrictive about cli flags](https://github.com/rust-lang/cargo/pull/6801)
+* [rustdoc: Fix infinite recursion](https://github.com/rust-lang/rust/pull/59539)
+* [rustdoc: collapse blanket impls in the same way as normal impls](https://github.com/rust-lang/rust/pull/59534)
+
+## 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:
+
+* [RFC 2657: Roadmap for 2019](https://github.com/rust-lang/rfcs/pull/2657).
+
+## 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: postpone] [Destructuring assignment](https://github.com/rust-lang/rfcs/pull/2649).
+
+### [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] [Tracking issue: const fn std::mem::needs_drop](https://github.com/rust-lang/rust/issues/51929).
+
+## New RFCs
+
+*No new RFCs were proposed this week.*
+
+# Upcoming Events
+
+### Asia Pacific
+
+* [Apr 20. Beijing, CN - RustCon Asia](https://rustcon.asia/).
+
+### Europe
+
+* [Apr  4. Zagreb, HR - Rust Meetup 201904: Persistent data in Rust](https://www.meetup.com/Zagreb-Rust-Meetup/events/259597646/).
+* [Apr  4. Wroclaw, PL - Rust Wroclaw Meetup](https://www.meetup.com/Rust-Wroclaw/events/259511136/).
+* [Apr  4. Madrid, ES - Madrid Rust Meetup](https://www.meetup.com/MadRust/events/259988070/).
+* [Apr 13. Kyiv, UA - PeerLab Kyiv #NativeDev: Rust 1.34 Release in Depth](https://www.meetup.com/PeerLab-Native-Developers/events/260050471/).
+* [Apr 17. Berlin, DE - Berlin Rust Hack and Learn](https://www.meetup.com/opentechschool-berlin/events/gkkttqyzgbwb/).
+* [Apr 18. Turin, IT - Mozilla Torino - Gruppo di studio Rust](https://www.meetup.com/Mozilla-Torino/events/ktqcpqyzgbhc/).
+
+### North America
+
+* [Apr  9. Seattle, US - Seattle Rust Meetup - Monthly meetup](https://www.meetup.com/Seattle-Rust-Meetup/events/nzfspqyzgbmb/).
+* [Apr  9. Irvine, US - Orange County Rust - C2Rust - Rewrite all the things](https://www.meetup.com/oc-rust/events/260233390/).
+* [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/).
+* [Apr 18. Denver, US - Rust Boulder/Denver - Rust Meetup for April](https://www.meetup.com/Rust-Boulder-Denver/events/259124388/).
+* [Apr 17. Vancouver, CA - Vancouver Rust meetup](https://www.meetup.com/Vancouver-Rust/events/gqbksqyzgbwb/).
+
+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
+
+* [Rust Developer at Smarkets, London, UK](https://smarkets.com/job/1617761/).
+* [Database Engine Developer at Parity, Berlin, DE](https://www.parity.io/jobs/#berlin-database-engine-developer).
+* [Lead Engineer (Cryptography) at Cosmian, Paris, FR](https://cosmian.com/wp-content/uploads/2019/03/Rust-CPP-lead-engineer.pdf).
+
+*Tweet us at [@ThisWeekInRust](https://twitter.com/ThisWeekInRust) to get your job offers listed here!*
+
+# Quote of the Week
+
+> Thanks for walking through the process.
+>
+> Quite the mental exercise, some people do Sudoku, others solve borrow puzzles!
+
+– [Gambhiro on rust-users](https://users.rust-lang.org/t/solved-channel-in-a-loop-in-a-thread-borrowed-value-does-not-live-long-enough/26733/9)
+
+Thanks to [Tom Phinney](https://users.rust-lang.org/t/twir-quote-of-the-week/328/633) 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>