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+Title: This Week in Rust 291
+Number: 291
+Date: 2019-06-18
+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
+
+* [gfx-rs: 5 year anniversary](https://gfx-rs.github.io/2019/06/12/anniversary-5.html).
+* [Green threads explained in 200 lines of Rust](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/).
+* [Facebook's new cryptocurrency Libra uses Rust](https://developers.libra.org/docs/community/coding-guidelines).
+* [Vimeo introduces support for AV1 using rav1e, a Rust library](https://press.vimeo.com/61553-vimeo-introduces-support-for-royalty-free-video-codec-av1).
+* [Amethyst v0.11.0 released, now supporting gfx-hal with Rendy](https://amethyst.rs/posts/release-0-11).
+* [Bzip2 in Rust: porting the randomization table](https://people.gnome.org/~federico/blog/bzip2-in-rust-randomization-table.html).
+* [Building secure systems using RISC-V and Rust](https://content.riscv.org/wp-content/uploads/2019/06/14.05-building_secure_systems-1.pdf).
+
+# Crate of the Week
+
+This week's crate is [safe](https://github.com/Centril/rust-safe), a `#[safe]` attribute for explaining why `unsafe { ... }` is OK. Thanks to [Michael-F-Bryan](https://users.rust-lang.org/t/crate-of-the-week/2704/569) 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.
+
+* [Final async/await testing push](https://internals.rust-lang.org/t/final-async-await-testing-push/10423).
+* [Rubble: Help wanted solving our BLE stack problem](https://mckeogh.tech/help-wanted-ble/). Rubble is a Bluetooth Low Energy compatible protocol stack for embedded Rust.
+* [contrie: Rayon support: FromParallelIterator & ParallelExtend](https://github.com/vorner/contrie/issues/3). ConTrie is a concurrent hash-trie map & set.
+
+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
+
+205 pull requests were [merged in the last week][merged]
+
+[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-06-10..2019-06-17
+
+* [Stabilize copy_within](https://github.com/rust-lang/rust/pull/61398).
+* [Stabilize underscore_const_names in 1.37.0](https://github.com/rust-lang/rust/pull/61347).
+* [Stabilize Option::xor](https://github.com/rust-lang/rust/pull/60376).
+* [rustc: replace `TyCtxt<'a, 'gcx, 'tcx>` with `TyCtxt<'gcx, 'tcx>`](https://github.com/rust-lang/rust/pull/61722).
+* [Unify all uses of 'gcx and 'tcx](https://github.com/rust-lang/rust/pull/61817).
+* [Deprecate ONCE_INIT in future 1.38 release](https://github.com/rust-lang/rust/pull/61757).
+* [Implement RFC 2645 (transparent enums and unions)](https://github.com/rust-lang/rust/pull/60463).
+* [Allow attributes in formal function parameters](https://github.com/rust-lang/rust/pull/60669).
+* [Implement Clone::clone_from for Option and Result](https://github.com/rust-lang/rust/pull/61348).
+* [Implement nth_back for Range(Inclusive)](https://github.com/rust-lang/rust/pull/61671).
+* [Use Symbol, Span in libfmt_macros](https://github.com/rust-lang/rust/pull/61568).
+* [typeck: Fix const generic in repeat param ICE](https://github.com/rust-lang/rust/pull/61698).
+* [Hygienize macros in the standard library](https://github.com/rust-lang/rust/pull/61629).
+* [Optimize matches](https://github.com/rust-lang/rust/pull/60730).
+* [When suggesting borrow, remove useless clones](https://github.com/rust-lang/rust/pull/61143).
+* [lexer: Disallow bare CR in raw byte strings](https://github.com/rust-lang/rust/pull/60793).
+* [Generator optimization: Overlap locals that never have storage live at the same time](https://github.com/rust-lang/rust/pull/60187).
+* [Implement unchecked_{add,sub,mul} intrinsics](https://github.com/rust-lang/miri/pull/776).
+* [Limit dylib symbols](https://github.com/rust-lang/rust/pull/59752).
+
+## 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)
+
+*No RFCs are currently in final comment period.*
+
+### [Tracking Issues & PRs](https://github.com/rust-lang/rust/labels/final-comment-period)
+
+*No issues are currently in final comment period.*
+
+## New RFCs
+
+*No new RFCs were proposed this week.*
+
+# Upcoming Events
+
+### Africa
+
+* [Jul  3. Johannesburg, ZA - Johannesburg Rust Meetup - informal discussions on topics related to the language](https://www.meetup.com/Johannesburg-Rust-Meetup/events/dgqmbryzkbfb/).
+
+### Asia Pacific
+
+* [Jun 24. Sydney, AU - Rust Sydney - Meetup 17](https://www.meetup.com/Rust-Sydney/events/262194894/).
+* [Jun 25. Seoul, KR - Seoul Rust Meetup, Hapjeong - Deep dive into Rusts standard library](https://www.meetup.com/Rust-Seoul-Meetup/events/srxvzqyzjbhc/).
+* [Jun 29. Taipei, TW - Rust Taiwan Meetup](https://www.facebook.com/events/2824830874225735/).
+* [Jul  1. Auckland, NZ - Rust AKL - WASM - Implementing a scalable omiscient debugger in Rust](https://www.meetup.com/rust-akl/events/259480968/).
+* [Jul  7. Tokyo, JP - Tokyo Rust Meetup - Rust LT #6](https://rust.connpass.com/event/133657/).
+
+### Europe
+
+* [Jun 26. Berlin, DE - OpenTechSchool Berlin - Rust Hack and Learn](https://www.meetup.com/opentechschool-berlin/events/gkkttqyzjbjc/).
+* [Jun 26. Milano, IT - Rust Language Milano - Fun with Rusty Robots](https://www.meetup.com/rust-language-milano/events/262155219).
+* [Jun 28-29. Firenze, IT - RustLab 2019](https://www.rustlab.it/).
+
+### North America
+
+* [Jun 24. Durham, NC, US - Triangle Rustaceans - Project Night & Lightning Talks](https://www.meetup.com/triangle-rustaceans/events/mfglwpyzjbgc/).
+* [Jun 25. Dallas, TX, US - Dallas Rust - Last Tuesday](https://www.meetup.com/Dallas-Rust/events/zfgwzmyzjbhc/).
+* [Jun 26. Ann Arbor, US - Ann Arbor Rust Meetup - Monthly Gathering](https://www.meetup.com/Ann-Arbor-Rust-Meetup/events/vsncvqyzjbjc/).
+* [Jun 26. Vancouver, BC, CA - Vancouver Rust meetup](https://www.meetup.com/Vancouver-Rust/events/fzqqwqyzjbjc/).
+* [Jul  3. Atlanta, GA, US - Grab a beer with fellow Rustaceans](https://www.meetup.com/Rust-ATL/events/kkzkxqyzkbfb/).
+* [Jul  3. Indianapolis, IN, US - Indy.rs](https://www.meetup.com/indyrs/events/mffbtpyzkbfb/).
+
+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
+
+* [Blockchain Runtime Engineer at Parity, Berlin, DE or remote](https://www.parity.io/jobs/#berlin-blockchain-runtime-engineer).
+
+*Tweet us at [@ThisWeekInRust](https://twitter.com/ThisWeekInRust) to get your job offers listed here!*
+
+# Quote of the Week
+
+*No quote was selected for QotW.*
+
+[Please submit quotes and vote for next week!](https://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>