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+Title: This Week in Rust 289
+Number: 289
+Date: 2019-06-04
+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
+
+* [Writing an OS in Rust: Updates in May 2019](https://os.phil-opp.com/status-update/2019-06-03/).
+* [Unsafe Code Guidelines Reference now available online](https://rust-lang.github.io/unsafe-code-guidelines/).
+* [Actix-web 1.0 released](https://github.com/actix/actix-web/blob/master/CHANGES.md).
+* [j4rs - calling Java code from Rust](https://astonbitecode.github.io/blog/post/j4rs_0.6.0/).
+* [The Governance WG is going public](https://blog.rust-lang.org/2019/06/03/governance-wg-announcement.html).
+* [Bzip2 in Rust - basic infrastructure and CRC32 computation](https://people.gnome.org/~federico/blog/bzip2-in-rust-basic-infra.html).
+* [Evoli - an official Amethyst showcase game](https://amethyst.rs/posts/evoli-an-official-amethyst-showcase-game).
+* [Poking the macOS IO Kit with Rust](https://svartalf.info/posts/2019-05-31-poking-the-macos-io-kit-with-rust/).
+
+# Crate of the Week
+
+This week's crate is [emu](https://github.com/calebwin/emu), a Rust-based language for programming GPUs. Thanks to [Caleb Winston](https://users.rust-lang.org/t/crate-of-the-week/2704/561) 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.
+
+* [Cargo: Less duplication in activate](https://github.com/rust-lang/cargo/pull/6967#issuecomment-497764185).
+
+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
+
+283 pull requests were [merged in the last week][merged]
+
+[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-05-27..2019-06-03
+
+* [Introduce Rust symbol mangling scheme](https://github.com/rust-lang/rust/pull/57967)
+* [Remove `GlobalArenas` and use `Arena` instead](https://github.com/rust-lang/rust/pull/61389)
+* [Short circuit `Send` and `Sync` impls for `TokenTree`](https://github.com/rust-lang/rust/pull/60967)
+* [Explicitly suggest `type_ascription` feature](https://github.com/rust-lang/rust/pull/61374)
+* [Recover gracefully from argument with missing type or param name](https://github.com/rust-lang/rust/pull/61331)
+* [When encountering move error on an `Option`, suggest using `as_ref`](https://github.com/rust-lang/rust/pull/61147)
+* [Reword malformed attribute input diagnostics](https://github.com/rust-lang/rust/pull/61140)
+* [Apply `#[must_use]` lint to components of tuples](https://github.com/rust-lang/rust/pull/61100)
+* [miri: Tag static/const allocations](https://github.com/rust-lang/miri/pull/748)
+* [Update LLVM to include fmin/fmax optimisations](https://github.com/rust-lang/rust/pull/61384)
+* [Stabilize `reverse_bits` feature](https://github.com/rust-lang/rust/pull/61364)
+* [Stabilize `iter_nth_back` feature](https://github.com/rust-lang/rust/pull/61363)
+* [Stabilize `RefCell::try_borrow_unguarded`](https://github.com/rust-lang/rust/pull/60850)
+* [`Weak::into_raw`](https://github.com/rust-lang/rust/pull/60766)
+* [Implement `iter::Sum` and `iter::Product` for `Option`](https://github.com/rust-lang/rust/pull/58975)
+* [Add `Step::sub_usize`](https://github.com/rust-lang/rust/pull/60542)
+* [`BufReader`: In Seek impl, remove extra discard_buffer call](https://github.com/rust-lang/rust/pull/61157)
+* [Do not print panic message on doctest failures](https://github.com/rust-lang/rust/pull/60549)
+* [cargo: Test the Resolver against the varisat Library](https://github.com/rust-lang/cargo/pull/6980)
+
+## 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 2678: Named custom cargo profiles](https://github.com/rust-lang/rfcs/pull/2678).
+
+## 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)
+
+* [disposition: merge] [Tracking issue for RFC 1789: Conversions from `&mut T` to `&Cell<T>`](https://github.com/rust-lang/rust/issues/43038).
+* [disposition: merge] [Stabilize copy_within](https://github.com/rust-lang/rust/pull/61398).
+* [disposition: merge] [Stabilize support for Profile-guided Optimization](https://github.com/rust-lang/rust/pull/61268).
+* [disposition: merge] [Stabilize `#![feature(repr_align_enum)]` in Rust 1.37.0](https://github.com/rust-lang/rust/pull/61229).
+* [disposition: merge] [Add std::mem::take as suggested in #61129](https://github.com/rust-lang/rust/pull/61130).
+* [disposition: merge] [Support ? Kleene macro operator in 2015](https://github.com/rust-lang/rust/pull/60932).
+
+## New RFCs
+
+* [Get type of an arbitrary expression](https://github.com/rust-lang/rfcs/pull/2706).
+* [Make `..` a pattern syntactically](https://github.com/rust-lang/rfcs/pull/2707).
+* [Amend RFC2603 to allow mangled identifiers to start with a digit](https://github.com/rust-lang/rfcs/pull/2705).
+
+# Upcoming Events
+
+### Asia Pacific
+
+* [Jun 10. Auckland, NZ - Rust AKL - WASM - the past, present and future](https://www.meetup.com/rust-akl/events/259480660/).
+* [Jun 12. Melbourne, AU - Rust Melbourne meetup](https://www.meetup.com/Rust-Melbourne/events/261628621/).
+
+### Europe
+
+* [Jun  6. Wroclaw, PL - Rust Wroclaw Meetup #11](https://www.meetup.com/Rust-Wroclaw/events/261283360/).
+* [Jun 12. Berlin, DE - OpenTechSchool Berlin - Rust Hack and Learn](https://www.meetup.com/opentechschool-berlin/events/gkkttqyzjbqb/).
+
+### North America
+
+* [Jun 11. Detroit, MI, US - Detroit Rust - June Detroit Rust at Bamboo](https://www.meetup.com/rust-detroit/events/244855856/).
+* [Jun 11. Redmond, WA, US - Seattle Rust Meetup - Monthly meetup](https://www.meetup.com/Seattle-Rust-Meetup/events/nzfspqyzjbpb/).
+* [Jun 12. Boston, MA, US - Boston Rust Meetup at MassRobotics](https://www.meetup.com/BostonRust/events/260834642/).
+* [Jun 13. San Diego, CA, US - San Diego Rust May Meetup](https://www.meetup.com/San-Diego-Rust/events/261595821/).
+* [Jun 13. Arlington, VA, US - Rust DC — Mid-month Rustful](https://www.meetup.com/RustDC/events/261239650).
+* [Jun 13. Columbus, OH, US - Columbus Rust Society - Monthly Meeting](https://www.meetup.com/columbus-rs/events/dbcfrpyzjbrb/).
+* [Jun 12. Vancouver, BC, CA - Vancouver Rust meetup](https://www.meetup.com/Vancouver-Rust/events/fzqqwqyzjbqb/).
+* [Jun 18. Denver, CO, US - Rust Boulder/Denver - Rust Meetup for June](https://www.meetup.com/Rust-Boulder-Denver/events/259124426/).
+* [Jun 19. Mexico City, MX - Rust MX - Reunión junio: Hablemos de Fuchsia OS y WebAssembly](https://www.meetup.com/Rust-MX/events/261739565/).
+
+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
+
+* [Software Engineer at 3DSignals, Kfar Saba, IL](https://3dsig.com/positions/software-engineer/).
+* [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
+
+> apparently I wrote Building Git to explain a complex problem to rust devs who could then help me build it in rust
+
+[/dev/horse @ jsconf eu (mountain_ghosts) on twitter](https://twitter.com/mountain_ghosts/status/1134739348593827841)
+
+Thanks to [Dos Moonen](https://users.rust-lang.org/t/twir-quote-of-the-week/328/656) for the suggestion!
+
+[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>