draft 312.

Author: nasa42

drafts/2019-11-12-this-week-in-rust.md

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+Title: This Week in Rust 312
+Number: 312
+Date: 2019-11-12
+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
+
+### #Rust2020
+
+Find all #Rust2020 posts at [Read Rust](https://readrust.net/rust-2020/).
+
+# Crate of the Week
+
+This week's crate is [displaydoc](https://github.com/yaahc/displaydoc), a procedural derive macro to implement `Display` by string-interpolating the doc comment.
+
+Thanks to [Willi Kappler](https://users.rust-lang.org/t/crate-of-the-week/2704/652) for the suggesion!
+
+[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.
+
+* [Announcing safety-dance: removing unnecessary unsafe code from popular crates](https://github.com/rust-secure-code/safety-dance).
+* [RFC: make Cargo embed dependency versions in the compiled binary](https://github.com/rust-lang/rfcs/pull/2801).
+* [good first issue] [cargo-sweep: Could cargo-sweep work without rustup](https://github.com/holmgr/cargo-sweep/issues/26)?
+* [good first issue] [Rubble: Add a function for reading the device address to rubble-nrf52](https://github.com/jonas-schievink/rubble/issues/89).
+* [good first issue] [Rubble: Don't give up when missing the initial transmit window](https://github.com/jonas-schievink/rubble/issues/77).
+* [good first issue] [Rubble: LLCP updates are not applied when the event is missed](https://github.com/jonas-schievink/rubble/issues/74).
+* [good first issue] [Rubble: Log buffer overflow on nrf52832](https://github.com/jonas-schievink/rubble/issues/69).
+* [good first issue] [Rubble: Try out `scroll` or `zerocopy` for de/encoding of PDUs](https://github.com/jonas-schievink/rubble/issues/53).
+* [good first issue] [Rubble: Only reply to LL_VERSION_IND once](https://github.com/jonas-schievink/rubble/issues/49).
+
+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
+
+217 pull requests were [merged in the last week][merged]
+
+[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-10-28..2019-11-04
+
+* [Allow foreign exceptions to unwind through Rust code and Rust panics to unwind through FFI](https://github.com/rust-lang/rust/pull/65646)
+* [expand: Feature gate out-of-line modules in proc macro input](https://github.com/rust-lang/rust/pull/66078)
+* [Lint ignored `#[inline]` on function prototypes](https://github.com/rust-lang/rust/pull/65294)
+* [Improve the "try using a variant of the expected type" hint](https://github.com/rust-lang/rust/pull/65562)
+* [Use heuristics to recover parsing of missing `;`](https://github.com/rust-lang/rust/pull/65640)
+* [Point at local similarly named element and tweak references to variants](https://github.com/rust-lang/rust/pull/65421)
+* [Custom lifetime error for `impl` item doesn't conform to `trait`](https://github.com/rust-lang/rust/pull/65068)
+* [Add lint and tests for unnecessary parens around types](https://github.com/rust-lang/rust/pull/65112)
+* [Correct handling of type flags with `ConstValue::Placeholder`](https://github.com/rust-lang/rust/pull/65643)
+* [Use structured suggestion for unnecessary bounds in type aliases](https://github.com/rust-lang/rust/pull/65914)
+* [save-analysis: Account for async desugaring in async fn return types](https://github.com/rust-lang/rust/pull/65936)
+* [Switch CrateMetadata's source_map_import_info from RwLock to Once](https://github.com/rust-lang/rust/pull/65979)
+* [Don't use `eval_always` for miri queries used from codegen](https://github.com/rust-lang/rust/pull/65927)
+* [rustc: use IndexVec<DefIndex, T> instead of Vec<T>](https://github.com/rust-lang/rust/pull/65825)
+* [Make `promote_consts` emit the errors when required promotion fails](https://github.com/rust-lang/rust/pull/65946)
+* [Implement ordered/sorted iterators on `BinaryHeap`](https://github.com/rust-lang/rust/pull/65091)
+* [Make `*`{`const`, `mut`} `T>::offset_from` const fn](https://github.com/rust-lang/rust/pull/63810)
+* [Stabilize `float_to_from_bytes` feature](https://github.com/rust-lang/rust/pull/66002)
+* [hashbrown: Introduce `ahash-compile-time-rng` feature](https://github.com/rust-lang/hashbrown/pull/125)
+* [cargo: Add --filter-platform to `cargo metadata`](https://github.com/rust-lang/cargo/pull/7376)
+* [cargo: Fix `cargo fix` not showing colors](https://github.com/rust-lang/cargo/pull/7550)
+* [chalk: Remove delayed literals](https://github.com/rust-lang/chalk/pull/270)
+* [chalk: Add TypeName::Error variant](https://github.com/rust-lang/chalk/pull/269)
+* [chalk: Output multiple solutions](https://github.com/rust-lang/chalk/pull/263)
+* [rustdoc: Stabilize `cfg(doctest)`](https://github.com/rust-lang/rust/pull/63803)
+
+## 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] [Announcing the FFI-unwinding Project Group](https://github.com/rust-lang/rfcs/pull/2797).
+* [disposition: postpone] [Signing registry index commits](https://github.com/rust-lang/rfcs/pull/2474).
+
+### [Tracking Issues & PRs](https://github.com/rust-lang/rust/labels/final-comment-period)
+
+* [disposition: merge] [Stabilize --extern flag without a path](https://github.com/rust-lang/rust/pull/64882).
+* [disposition: merge] [Fully integrate derive helpers into name resolution](https://github.com/rust-lang/rust/pull/64694).
+* [disposition: merge] [Make the semantics of Vec::truncate(N) consistent with slices](https://github.com/rust-lang/rust/pull/64432).
+* [disposition: merge] [Use ptr::drop_in_place for VecDeque::truncate and VecDeque::clear](https://github.com/rust-lang/rust/pull/65933).
+
+## New RFCs
+
+* [Add method Result::into_ok](https://github.com/rust-lang/rfcs/pull/2799).
+* [Make Cargo embed dependency versions in the compiled binary](https://github.com/rust-lang/rfcs/pull/2801).
+* [Vec::recycle](https://github.com/rust-lang/rfcs/pull/2802).
+* [Target tier policy](https://github.com/rust-lang/rfcs/pull/2803).
+* [[T]::rejoin](https://github.com/rust-lang/rfcs/pull/2806).
+
+# Upcoming Events
+
+### Asia Pacific
+
+* [Nov 13. Selangor, MY - Rust Malaysia Meetup November 2019](https://docs.google.com/forms/d/e/1FAIpQLSfZM9XYmBXq9tjqRziR-O3vBmm4rt1Ltnc9bGcleVrLmZHrSg/viewform).
+
+### Europe
+
+* **[Nov 9 & 10. Barcelona, ES - RustFest Barcelona 2019](https://barcelona.rustfest.eu/).**
+* [Nov 12. Hamburg, DE - Rust Hack & Learn November 2019](https://www.meetup.com/Rust-Meetup-Hamburg/events/265899865/).
+* [Nov 13. Wrocław, PL - Rust Wrocław Meetup #14](https://www.meetup.com/Rust-Wroclaw/events/265813648/).
+* [Nov 13. Berlin, DE - OpenTechSchool Berlin - Rust Hack and Learn](https://www.meetup.com/opentechschool-berlin/events/nxdpgryzpbrb/).
+* [Nov 14. Zurich, CH - Rust Zurich - RustFest Decompression Zürich](https://www.meetup.com/Rust-Zurich/events/265593126/).
+* [Nov 14. Moscow, RU - Rust Moscow November 2019 Meetup](https://www.meetup.com/ru-RU/Rust-%D0%B2-%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B5/events/266184946/).
+* [Nov 15. Barcelona, ES - Rust GTK/GStreamer Workshop at Linux Application Summit 2019](https://www.meetup.com/Barcelona-Free-Software/events/265596417/).
+* [Nov 21. Turin, IT - Mozilla Torino - Gruppo di studio Rust](https://www.meetup.com/Mozilla-Torino/events/265961100).
+
+### North America
+
+* [Nov 12. Seattle, WA, US - Seattle Rust Meetup - Monthly meetup](https://www.meetup.com/Seattle-Rust-Meetup/events/prbtdryzpbqb/).
+* [Nov 13. Atlanta, GA, US - Grab a beer with fellow Rustaceans](https://www.meetup.com/Rust-ATL/events/qxqdgryzpbrb/).
+* [Nov 13. Vancouver, BC, CA - Vancouver Rust meetup](https://www.meetup.com/Vancouver-Rust/events/rwcpfryzpbrb/).
+* [Nov 14. San Diego, CA, US - San Diego Rust November Meetup](https://www.meetup.com/San-Diego-Rust/events/265981542/).
+* [Nov 14. Lehi, UT, US - Utah Rust - November 2019 Regular Meetup](https://www.meetup.com/utah-rust/events/265905259/).
+* [Nov 14. Columbus, OH, US - Columbus Rust Society - Monthly Meeting](https://www.meetup.com/columbus-rs/events/dpkhgryzpbsb/).
+* [Nov 14. Montreal, QC, CA - Montreal Rust Meetup - November 2019 RustMTL: November Common Traits & Causal Profiling](https://www.meetup.com/Rust-Montreal/events/prvrjryzpbqb/).
+* [Nov 20. Portland, OR, US - PDXRust - Hack Night](https://www.meetup.com/PDXRust/events/265998640/).
+
+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
+
+*Tweet us at [@ThisWeekInRust](https://twitter.com/ThisWeekInRust) to get your job offers listed here!*
+
+# Quote of the Week
+
+> I did manage to get this compile in the end - does anyone else find that the process of asking the question well on a public forum organizes their thoughts well enough to solve the problem?
+
+– [David Mason on rust-users](https://users.rust-lang.org/t/std-phantomdata-and-unused-fields-in-structs/34271/3)
+
+Thanks to [Daniel H-M](https://users.rust-lang.org/t/twir-quote-of-the-week/328/725) 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>