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+Title: This Week in Rust 283
+Number: 283
+Date: 2019-04-23
+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
+
+* [Rust's 2019 roadmap](https://blog.rust-lang.org/2019/04/23/roadmap.html).
+* [Amethyst receives Mozilla grant for WASM development](https://www.amethyst.rs/blog/moss-grant-announce/).
+* [6 useful Rust macros that you might not have seen before](https://medium.com/@benmcdonald_11671/6-useful-rust-macros-that-you-might-not-have-seen-before-59d1386f7bc5).
+* [Learning parser combinators with Rust](https://bodil.lol/parser-combinators/).
+* [What not to do in Rust](https://blog.sentry.io/2018/04/05/you-cant-rust-that).
+* [Generic returns in Rust](https://blog.jcoglan.com/2019/04/22/generic-returns-in-rust/).
+* [Futures 0.1 compatibility layer](https://rust-lang-nursery.github.io/futures-rs/blog/2019/04/18/compatibility-layer.html).
+* [What I learned from my failed attempt of writing baremetal android in Rust](https://onatm.dev/2019/04/22/what-i-learned-from-my-failed-attempt-of-writing-baremetal-android-in-rust/).
+* [Building a plugin system using Rust and Wasmer](https://wiredforge.com/blog/wasmer-plugin-pt-1) ([part 2](https://wiredforge.com/blog/wasmer-plugin-pt-2), [part 3](https://wiredforge.com/blog/wasmer-plugin-pt-3/index.html)).
+* [Using DMA to transfer data with embedded Rust](https://flowdsp.io/blog/stm32f3-02-dac-dma/).
+* [AiC: Adventures in consensus](http://smallcultfollowing.com/babysteps/blog/2019/04/19/aic-adventures-in-consensus/).
+* [rustup 1.18.0 released](https://github.com/rust-lang/rustup.rs/blob/master/CHANGELOG.md#1180---2019-04-22).
+* [RustFest 2019 - next stop: Barcelona](https://blog.rustfest.eu/next-stop-barcelona).
+* [Videos from Rust Latam 2019](https://www.youtube.com/playlist?list=PL85XCvVPmGQjuWUNeFCgl8X2EOC_aAq5N).
+
+# Crate of the Week
+
+This week's crate is [color-backtrace](https://github.com/athre0z/color-backtrace), a crate to give panic backtraces more information (and some color, too). Thanks to [Willi Kappler](https://users.rust-lang.org/t/crate-of-the-week/2704/518) 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.
+
+* The [CFP for "Everything in Rust" in COSCUP](https://blog.coscup.org/2019/04/2019-cfp-open.html#rust) is open now. Rust Taiwan Community is looking for speakers. COSCUP is one of the biggest open source conferences in Asia and takes place in Taipei, Taiwan.
+* The [CFP for Colorado Gold Rust](https://cfp.cogoldrust.com/events/cogoldrust-2019) is open now. The organizers are also looking for volunteers to help people draft talk proposals. If you can help out [send them an email](mailto:coloradogoldrust@gmail.com) or DM them on Twitter at [@COGoldRust](https://twitter.com/cogoldrust).
+* [Evolution Island: Amethyst showcase game looking for collaborators](https://www.reddit.com/r/rust/comments/bf65l3/evolution_island_amethyst_showcase_game_looking/).
+* [good first issue] [futures-jsonrpc: Handler track request/reply](https://github.com/vlopes11/futures-jsonrpc/issues/2).
+* [Out-of-band crate evaluation for 2019-04-19: uuid](https://internals.rust-lang.org/t/out-of-band-crate-evaluation-for-2019-04-19-uuid/9848).
+
+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
+
+221 pull requests were [merged in the last week][merged]
+
+[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-04-15..2019-04-22
+
+* [Implement event filtering for self-profiler](https://github.com/rust-lang/rust/pull/59915)
+* [Continue evaluating after missing main](https://github.com/rust-lang/rust/pull/59903)
+* [Point at try `?` on errors affecting the err match arm of the desugared code](https://github.com/rust-lang/rust/pull/60064)
+* [Make const parameters enforce no variance constraints](https://github.com/rust-lang/rust/pull/60058)
+* [save-analysis: Use serde instead of libserialize to dump JSON data](https://github.com/rust-lang/rust/pull/60053)
+* [Fix ICE on const evaluation of const method](https://github.com/rust-lang/rust/pull/60048)
+* [Specialize `nth_back()` for `Bytes`, `Fuse` and `Enumerate`](https://github.com/rust-lang/rust/pull/60023)
+* [Fix the max value of `usize` on 16-bit platforms](https://github.com/rust-lang/rust/pull/60013)
+* [Fix `LinkedList` invalidating mutable references](https://github.com/rust-lang/rust/pull/60072)
+* [Allow multiple args to `dbg!(..)`](https://github.com/rust-lang/rust/pull/59826)
+* [Add `must_use` annotations to `Result::is_ok` and `is_err`](https://github.com/rust-lang/rust/pull/59648)
+* [chalk: Remove coinductive_traits from `ProgramEnvironment`](https://github.com/rust-lang/chalk/pull/213)
+* [chalk: Simplify crate structure](https://github.com/rust-lang/chalk/pull/215)
+* [cargo: Treat HTTP/2 stream errors as spurious network errors](https://github.com/rust-lang/cargo/pull/6861)
+* [cargo: Validate registry token before operations that require it](https://github.com/rust-lang/cargo/pull/6854)
+* [cargo: Pass `OsStr`/`OsString` args through to the process spawned by cargo run](https://github.com/rust-lang/cargo/pull/6849)
+* [rustdoc: Remove `default` keyword from re-exported trait methods](https://github.com/rust-lang/rust/pull/59978)
+
+## 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] [Attributes in formal function parameter position](https://github.com/rust-lang/rfcs/pull/2565).
+
+### [Tracking Issues & PRs](https://github.com/rust-lang/rust/labels/final-comment-period)
+
+* [disposition: merge] [[Stabilization] Future APIs](https://github.com/rust-lang/rust/issues/59725).
+* [disposition: merge] [Tracking issue for vectored IO support](https://github.com/rust-lang/rust/issues/58452).
+* [disposition: merge] [Tracking issue for Iterator::copied](https://github.com/rust-lang/rust/issues/57127).
+* [disposition: merge] [Implement `iter::Sum` and `iter::Product` for `Option`](https://github.com/rust-lang/rust/pull/58975).
+
+## New RFCs
+
+* [Add `f16b` floating-point type for native support of `bfloat16`](https://github.com/rust-lang/rfcs/pull/2690).
+* [Allow floating-point operations to provide extra precision than specified, as an optimization](https://github.com/rust-lang/rfcs/pull/2686).
+* [Introduce "compiler-team contributors"](https://github.com/rust-lang/rfcs/pull/2689).
+
+# Upcoming Events
+
+### Africa
+
+* [May  2. Johannesburg, ZA - Johannesburg meetup - Everybody Borrows](https://www.meetup.com/Johannesburg-Rust-Meetup/events/gpxrtqyzhbcb/).
+
+### Asia Pacific
+
+* [Apr 20. Beijing, CN - RustCon Asia](https://rustcon.asia/).
+* [Apr 20. Taipei, TW - Rust Taiwan Meetup](https://www.facebook.com/events/400895290642737/).
+* [Apr 24. Tokyo, JP - Tokyo Rust Meetup](https://rust.connpass.com/event/125666/).
+* [May  6. Auckland, NZ - Rust AKL - Rust Debugging Techniques + Lightening Talks](https://www.meetup.com/rust-akl/events/259480601/).
+* [May  8. Kuala Lumpur, MY - Rust Meetup May 2019](https://docs.google.com/forms/d/e/1FAIpQLScUHpCLPMF8I1QxA_WnIz9bipalrNsUckSyLMysGGNB5y0Lyw/viewform).
+
+### Europe
+
+* [Apr 25. Paris, FR - Rust Paris meetup #44](https://www.meetup.com/Rust-Paris/events/260443108/).
+* [Apr 25. Brno, CZ - Rust Brno meetup](https://rust-brno.github.io/).
+* [Apr 26. Stuttgart, DE - Rust Meetup #2](https://gettogether.community/rust-stuttgart/)
+* [Apr 26. Berlin, DE - Oxidize Berlin Conference](https://oxidizeconf.com/).
+* [Apr 30. London, UK - Rust London User Group - LDN Talks](https://www.meetup.com/Rust-London-User-Group/events/260565918/).
+* [Apr 30. Vienna, AT - Rust Meetup](https://www.meetup.com/Rust-Vienna/events/260693863/).
+* [May  1. Berlin, DE - Berlin Rust Hack and Learn](https://www.meetup.com/opentechschool-berlin/events/gkkttqyzhbcb/).
+* [May  2. Munich, DE - Rust Munich - Rust libp2p](https://www.meetup.com/rust-munich/events/259984522/).
+* [May  6. Budapest, HU - Rust Hungary Meetup](https://www.meetup.com/Rust-Hungary-Meetup/events/260651034/).
+* [May  9. Wrocław, PL - Rust Wroclaw Meetup #10](https://www.meetup.com/Rust-Wroclaw/events/260858425/).
+* [May  9. Berlin, DE - Rust+GNOME 2019 Hackfest#5](https://wiki.gnome.org/Hackfests/Rust2019).
+
+### North America
+
+* [Apr 25. San Francisco, US - WebAssembly SF - Let's talk about Rust and a microkernel @ Cloudflare](https://www.meetup.com/wasmsf/events/260288977/).
+* [Apr 30. Dallas, US - Dallas Rust - Last Tuesday](https://www.meetup.com/Dallas-Rust/events/zfgwzmyzgbnc/).
+* [May  1. Vancouver, CA - Vancouver Rust meetup](https://www.meetup.com/Vancouver-Rust/events/hjrwvqyzhbcb/).
+* [May  1. Atlanta, US - Grab a beer with fellow Rustaceans](https://www.meetup.com/Rust-ATL/events/lgtvsqyzhbcb/).
+* [May  9. San Diego, US - San Diego Rust May Meetup](https://www.meetup.com/San-Diego-Rust/events/260763786/).
+* [May  9. Arlington, US - Rust DC — Mid-month Rustful](https://www.meetup.com/RustDC/events/260559957).
+* [May  9. Columbus, US - Columbus Rust Society - Monthly Meeting](https://www.meetup.com/columbus-rs/events/dbcfrpyzhbmb/).
+
+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://twitter.com/ParityTech/status/1120303295606788097).
+* [Senior Firware Engineer (Rust/C) at Helium, San Francisco, US](https://angel.co/helium-2/jobs/541447-senior-firware-engineer-rust-c).
+
+*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 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>