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+Title: This Week in Rust 281
+Number: 281
+Date: 2019-04-09
+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).
+
+**Important Update**: The *This Week in Rust* privacy policy has changed due to our migration to GitHub pages for hosting. The current policy can be accessed [here](https://this-week-in-rust.org/pages/privacy-policy.html). The git-diff can be [viewed here](https://github.com/cmr/this-week-in-rust/pull/885/files).
+
+# Updates from Rust Community
+
+## News & Blog Posts
+
+* [Rust is the most loved language four years in a row](https://insights.stackoverflow.com/survey/2019#most-loved-dreaded-and-wanted).
+* [How to compose functions in Rust](https://stackoverflow.com/questions/45786955/how-to-compose-functions-in-rust).
+* [A basic web application with Rust and Actix-web](https://zupzup.org/rust-webapp/).
+* [More tricks up in the ArcSwap’s sleeve](https://vorner.github.io/2019/04/06/tricks-in-arc-swap.html).
+* [Arenas vs. indices](https://llogiq.github.io/2019/04/06/arena.html).
+* [Protocols in Tokio (i3 IPC)](https://leshow.github.io/post/impl_proto_tokio/).
+* [Array1 and function traits (scientific computing: a Rust adventure, part 2)](https://www.lpalmieri.com/posts/2019-04-07-scientific-computing-a-rust-adventure-part-2-array1/).
+
+# Crate of the Week
+
+This week's crate is [interact](https://github.com/interact-rs/interact), a framework for online introspection of the running program state. Thanks to [Willi Kappler](https://users.rust-lang.org/t/crate-of-the-week/2704/513) 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.
+
+* [Releasing nom 5.0](https://www.reddit.com/r/rust/comments/ba366j/call_for_help_releasing_nom_50/).
+* [Veloren, the open-source voxel MMORPG, is looking for contributors](https://veloren.net/).
+* [pulldown-cmark: Create a framework for detecting quadratic time regressions](https://github.com/raphlinus/pulldown-cmark/issues/257).
+* [compact_arena: Make the crate `no_std`](https://github.com/llogiq/compact_arena/issues/1).
+
+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
+
+198 pull requests were [merged in the last week][merged]
+
+[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-04-01..2019-04-08
+
+* [Show better errors for LLVM IR output](https://github.com/rust-lang/rust/pull/59744)
+* [Use for_each to extend collections](https://github.com/rust-lang/rust/pull/59740)
+* [wasi: Use shared API for preopened file descriptors](https://github.com/rust-lang/rust/pull/59727)
+* [Never return uninhabited values at all](https://github.com/rust-lang/rust/pull/59639)
+* [Shrink `mir::Statement`](https://github.com/rust-lang/rust/pull/59630)
+* [Refactor async fn return type lowering](https://github.com/rust-lang/rust/pull/59286)
+* [Unsized rvalues: implement boxed closure impls](https://github.com/rust-lang/rust/pull/59500)
+* [Fixes for shallow borrows](https://github.com/rust-lang/rust/pull/59585)
+* [Suggest using anonymous lifetime in `impl Trait` return](https://github.com/rust-lang/rust/pull/58919)
+* [Fix invalid bounds string generation in rustdoc](https://github.com/rust-lang/rust/pull/58894)
+* [More restrictive 2 phase borrows - take 2](https://github.com/rust-lang/rust/pull/58739)
+* [Tweak `Span` encoding](https://github.com/rust-lang/rust/pull/58458)
+* [Add 'partition_at_index/_by/_by_key' for slices](https://github.com/rust-lang/rust/pull/55448)
+* [Support allocating iterators with arenas](https://github.com/rust-lang/rust/pull/59533)
+* [Remove duplicated code from Iterator::{ne, lt, le, gt, ge}](https://github.com/rust-lang/rust/pull/59262)
+* [Forward formatter settings to bounds of `Range<T>` in `fmt::Debug` impl](https://github.com/rust-lang/rust/pull/59596)
+* [std: Avoid usage of `Once` in `Instant`](https://github.com/rust-lang/rust/pull/59676)
+* [Improve worst-case performance of HashSet.is_subset](https://github.com/rust-lang/rust/pull/59665)
+* [Improve worst-case performance of BTreeSet intersection](https://github.com/rust-lang/rust/pull/59186)
+* [Implement useful steps_between for all integers](https://github.com/rust-lang/rust/pull/59444)
+* [cargo: Add install-upgrade](https://github.com/rust-lang/cargo/pull/6798)
+* [cargo: Improve error message to rerun a test in a workspace](https://github.com/rust-lang/cargo/pull/6824)
+* [cargo Resolve: Be less strict while offline](https://github.com/rust-lang/cargo/pull/6814)
+* [cargo: Add more suggestions on how to deal with excluding a package from a workspace](https://github.com/rust-lang/cargo/pull/6805)
+* [Allow `cargo install --path P` to load config from P](https://github.com/rust-lang/cargo/pull/6804)
+* [Allow `cargo doc --open` with multiple packages](https://github.com/rust-lang/cargo/pull/6803)
+* [Speed up rustdoc run](https://github.com/rust-lang/rust/pull/59452)
+* [crates.io: Add monitoring for common spam patterns](https://github.com/rust-lang/crates.io/pull/1678)
+
+## 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 2480: Stabilize the alloc crate](https://github.com/rust-lang/rfcs/pull/2480).
+
+## 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] [Permit `-> _` return types for improved diagnostics](https://github.com/rust-lang/rust/issues/56132).
+
+## New RFCs
+
+* [Named custom cargo profiles](https://github.com/rust-lang/rfcs/pull/2678).
+* [Add the Close trait](https://github.com/rust-lang/rfcs/pull/2677).
+
+# Upcoming Events
+
+### 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/).
+
+### Europe
+
+* [Apr 11. Oslo, NO - Rust Oslo - Hack & Learn](https://www.meetup.com/Rust-Oslo/events/260244075/).
+* [Apr 13. Kyiv, UA - PeerLab Kyiv #NativeDev: Rust 1.34 Release in Depth](https://www.meetup.com/PeerLab-Native-Developers/events/260050471/).
+* [Apr 16. Rome, IT - Rust Roma - Rust learning and hacking evening #17](https://www.meetup.com/Rust-Roma/events/260430915/).
+* [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/).
+* [Apr 25. Toulouse, FR - Mon premier service web en Rust](https://www.meetup.com/Toulouse-Rust-Meetup/events/260218832).
+* [Apr 26. Stuttgart, DE - Rust Meetup #2](https://gettogether.community/rust-stuttgart/)
+* [Apr 26. Berlind, DE - Oxidize Berlin Conference](https://oxidizeconf.com/).
+
+### North America
+
+* [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 11. San Diego, US - San Diego Rust April Meetup](https://www.meetup.com/San-Diego-Rust/events/260346466/).
+* [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/).
+* [Apr 22. Durham, US - Triangle Rustaceans](https://www.meetup.com/triangle-rustaceans/events/mfglwpyzgbdc/).
+* [Apr 23. Chicago, US - Chicago Rust Meetup - Discussion: Better Method Chaining in Rust](https://www.meetup.com/Chicago-Rust-Meetup/events/260321118).
+* [Apr 24. Sacramento, US - Hands-on Rust](https://www.meetup.com/Rust-Sacramento/events/260347016/).
+* [Apr 24. Ann Arbor, US - Ann Arbor Rust Meetup - Monthly Gathering](https://www.meetup.com/Ann-Arbor-Rust-Meetup/events/vsncvqyzgbgc/).
+
+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
+
+* [Senior Software Engineer, Backend - Rust at Kraken, Remote](https://jobs.lever.co/kraken/4c864c8f-bde6-443d-b521-dd90df0e9105).
+* [Rust Systems Software Engineer at Cloudseal, Remote (US)](https://www.cloudseal.io/hiring/rust-systems-software-engineer-sp19).
+* [Compilers (LLVM), distributed systems, & theorem proving engineers at Offscale.io, Remote/Sydney, AU](https://www.reddit.com/r/rust/comments/bb33yo/job_compilers_llvm_distributed_systems_theorem/).
+
+*Tweet us at [@ThisWeekInRust](https://twitter.com/ThisWeekInRust) to get your job offers listed here!*
+
+# Quote of the Week
+
+Sadly there was no suggestion this week.
+
+[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](https://www.reddit.com/r/rust/comments/b93t3p/this_week_in_rust_280/).</small>