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+Title: This Week in Rust 271
+Number: 271
+Date: 2019-01-29
+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: Advanced paging](https://os.phil-opp.com/advanced-paging/).
+* [Embedding WebAssembly in your Rust application](https://medium.com/wasmer/executing-webassembly-in-your-rust-application-d5cd32e8ce46).
+* [Lock-free Rust: Crossbeam in 2019](https://stjepang.github.io/2019/01/29/lock-free-rust-crossbeam-in-2019.html).
+* [Performance of Rust's match vs. lookup tables](https://kevinlynagh.com/notes/match-vs-lookup/).
+* [Librsvg's GObject boilerplate is in Rust now](https://people.gnome.org/~federico/blog/librsvg-gobject-in-rust.html).
+* [Enjoy a slice of QUIC, and Rust](https://blog.cloudflare.com/enjoy-a-slice-of-quic-and-rust/). Quiche is an implementation of the QUIC transport protocol, by Cloudflare.
+* [Exporting Serde types to TypeScript](http://timryan.org/2019/01/22/exporting-serde-types-to-typescript.html).
+
+# Crate of the Week
+
+This week's crate is [typetag](https://github.com/dtolnay/typetag), a small crate to allow for serde trait objects. Thanks to [Christopher Durham](https://users.rust-lang.org/t/crate-of-the-week/2704/481) 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.
+
+* [Request for implementation - Crates that don't exist, but should](https://github.com/dtolnay/request-for-implementation).
+
+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
+
+186 pull requests were [merged in the last week][merged]
+
+[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-01-21..2019-01-28
+
+* [enable RISC-V atomic compare and swap](https://github.com/rust-lang/rust/pull/57925)
+* [recover from parse errors in literal struct fields and incorrect float literals](https://github.com/rust-lang/rust/pull/57779)
+* [merge visitors in AST validation](https://github.com/rust-lang/rust/pull/57730)
+* [resolve: Fix span arithmetics in the import conflict error](https://github.com/rust-lang/rust/pull/57908)
+* [fix race condition when emitting stored diagnostics](https://github.com/rust-lang/rust/pull/57066)
+* [don't ICE when logging unusual types](https://github.com/rust-lang/rust/pull/57865)
+* [combine all builtin early lints](https://github.com/rust-lang/rust/pull/57726)
+* [add suggestion for moving type declaration before associated type bindings in generic arguments](https://github.com/rust-lang/rust/pull/57886)
+* [add suggestion for incorrect field syntax](https://github.com/rust-lang/rust/pull/57863)
+* [suggest removing leading left angle brackets](https://github.com/rust-lang/rust/pull/57852)
+* [add error for trailing angle brackets](https://github.com/rust-lang/rust/pull/57817)
+* [print visible name for types as well as modules](https://github.com/rust-lang/rust/pull/57802)
+* [use structured suggestion instead of notes](https://github.com/rust-lang/rust/pull/57795)
+* [explain type mismatch cause pointing to return type when it is `impl Trait`](https://github.com/rust-lang/rust/pull/57793)
+* [when using value after move, point at span of local](https://github.com/rust-lang/rust/pull/57294)
+* [conditionally skip two passes if their related attributes were not found](https://github.com/rust-lang/rust/pull/57691)
+* [fix evaluating trivial drop glue in constants](https://github.com/rust-lang/rust/pull/57734)
+* [const_eval: predetermine the layout of all locals when pushing a stack frame](https://github.com/rust-lang/rust/pull/57677)
+* [fix memory leak in `P::filter_map`](https://github.com/rust-lang/rust/pull/57667)
+* [get rid of the fake stack frame for reading from constants](https://github.com/rust-lang/rust/pull/57606)
+* [add intrinsic to create an integer bitmask from a vector mask](https://github.com/rust-lang/rust/pull/57269)
+* [un-deprecate `mem::zeroed`](https://github.com/rust-lang/rust/pull/57825)
+* [make `MutexGuard`'s `Debug` implementation more useful](https://github.com/rust-lang/rust/pull/57703)
+* [make `str` indexing generic on `SliceIndex`](https://github.com/rust-lang/rust/pull/57604)
+* [small perf improvement for `fmt`](https://github.com/rust-lang/rust/pull/57537)
+* [add signed `num::NonZeroI*` types](https://github.com/rust-lang/rust/pull/57475)
+* [std: stabilize fixed-width integer atomics](https://github.com/rust-lang/rust/pull/57425)
+* [use pinning for generators to make trait safe](https://github.com/rust-lang/rust/pull/55704)
+* [implement `optimize(size)` and `optimize(speed)` attributes](https://github.com/rust-lang/rust/pull/55641)
+* [cargo: make incremental compilation the default for all profiles](https://github.com/rust-lang/cargo/pull/6564)
+* [rustdoc: fix ICE from loading proc-macro stubs](https://github.com/rust-lang/rust/pull/57846)
+
+## 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] [stabilize `std::task` and `std::future::Future`](https://github.com/rust-lang/rfcs/pull/2592).
+* [disposition: postpone] [RFC for anonymous variant types, a minimal ad-hoc sum type](https://github.com/rust-lang/rfcs/pull/2587).
+
+### [Tracking Issues & PRs](https://github.com/rust-lang/rust/labels/final-comment-period)
+
+* [disposition: merge] [Deprecate the unstable Vec::resize_default](https://github.com/rust-lang/rust/pull/57656).
+* [disposition: merge] [Error on duplicate matcher bindings](https://github.com/rust-lang/rust/pull/57617).
+* [disposition: merge] [syntax: Remove warning for unnecessary path disambiguators](https://github.com/rust-lang/rust/pull/57565).
+* [disposition: merge] [Automatically open an issue when a tool breaks](https://github.com/rust-lang/rust/pull/56951).
+* [disposition: merge] [[WIP] Unsized rvalues: implement boxed closure impls.](https://github.com/rust-lang/rust/pull/55431).
+* [disposition: merge] [Tracking issue for Range*::contains](https://github.com/rust-lang/rust/issues/32311).
+
+## New RFCs
+
+* [RFC for a formalized notion on where to enforce reference propertes in MIR](https://github.com/rust-lang/rfcs/pull/2631).
+* [proc-macro-attribute-recursion](https://github.com/rust-lang/rfcs/pull/2628).
+
+# Upcoming Events
+
+### Online
+
+* [Feb  6. Rust Community Team Meeting on Discord](https://discordapp.com/channels/442252698964721669/443773747350994945).
+* [Feb 13. Rust Events Team Meeting on Telegram](https://t.me/joinchat/EkKINhHCgZ9llzvPidOssA).
+
+### Africa
+
+* [Feb  6. Sandown, ZA - Johannesburg meetup](https://www.meetup.com/Johannesburg-Rust-Meetup/events/qbhxmqyzdbjb/).
+
+### Asia Pacific
+
+* [Feb 13. Melbourne, AU - Melbourne hack night](https://www.meetup.com/Rust-Melbourne/events/257974991/).
+
+### Europe
+
+* [Jan 31. Helsinki, FI - Helsinki Rust meetup](https://www.meetup.com/Finland-Rust-Meetup/events/257863678/).
+* [Jan 31. Copenhagen, DK - [cph.rs] Copenhagen Rust Hack Night #12 ](http://cph.rs/).
+* [Jan 31. Oslo, NO - Rust Oslo - Hack & Learn](https://www.meetup.com/Rust-Oslo/events/258150829/).
+* [Jan 31. Torino, IT - Turin Rust meetup](https://www.meetup.com/Mozilla-Torino/events/sbtclqyzcbgc/).
+* [Feb  3. Bruxelles, BG - Rust Dev Room @ FOSDEM](https://fosdem.org/2019/).
+* [Feb  6. Berlin, DE - Berlin Rust Hack and Learn](https://www.meetup.com/opentechschool-berlin/events/rjgkhqyzdbjb/).
+
+### North America
+
+* [Jan 31. Phoenix, US - Phoenix Rust: Games](https://www.meetup.com/Desert-Rustaceans/events/257976456).
+* [Feb  6. Atlanta, US - Rust Atlanta Meetup](https://www.meetup.com/Rust-ATL/events/cbcmbqyzdbjb/).
+* [Feb  6. Vancouver, CN - Vancouver Rust meetup](https://www.meetup.com/Vancouver-Rust/events/hkllqqyzdbjb/).
+* [Feb  7. Indianapolis, US - Indy.rs](https://www.meetup.com/indyrs/events/246726699/).
+* [Feb 12. Seattle, US - Seattle Rust Meetup](https://www.meetup.com/Seattle-Rust-Meetup/events/nzfspqyzdbpb/).
+* [Feb 12. Utah, US - Utah Rust monthly meetup](https://www.meetup.com/utahrust/events/257819656/).
+
+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 Embedded Systems Engineer at SpanIO, San Francisco, US](https://www.span.io/careers/embedded-linux).
+* [Senior Software Engineer at Prevoty, Los Angeles, US](https://www.prevoty.com/about/careers?gh_jid=4032159002).
+
+*Tweet us at [@ThisWeekInRust](https://twitter.com/ThisWeekInRust) to get your job offers listed here!*
+
+# Quote of the Week
+
+> Rust is kind of nice in that it lets you choose between type erasure and monomorphization, or between heap-allocation and stack-allocation, but the downside is that you have to choose.
+
+– Brook Heisler [on discord](https://discordapp.com/channels/442252698964721669/448238009733742612/536406836178583562) (login needed, sorry!)
+
+Thanks to [scottmcm](https://users.rust-lang.org/t/twir-quote-of-the-week/328/614) 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>