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+Title: This Week in Rust 61
+Date: 2014-12-15
+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:
+safe, concurrent, and fast. This is a weekly summary of its progress and
+community. Want something mentioned? [Send me an
+email!](mailto:corey@octayn.net?subject=This%20Week%20in%20Rust%20Suggestion)
+Want to get involved? [We love
+contributions](https://github.com/mozilla/rust/wiki/Note-guide-for-new-contributors).
+
+This Week in Rust is openly developed [on Github](https://github.com/cmr/this-week-in-rust).
+If you find any errors or omissions in this week's issue, [please submit a PR](https://github.com/cmr/this-week-in-rust/pulls).
+
+# What's cooking on master?
+
+60 pull requests were [merged in the last week][1].
+
+[1]: https://github.com/rust-lang/rust/pulls?q=is%3Apr+is%3Amerged+updated%3A2014-12-08..2014-12-15
+
+Now you can follow breaking changes *[as they happen][BitRust]*!
+
+[BitRust]: http://bitrust.octarineparrot.com/
+
+## Breaking Changes
+
+* Implementations of `Copy` must [now be declared
+  explicitly][optin]. This is part of the [opt-in-builtin traits RFC
+  (colloquially knows as OIBIT)][optin-rfc] which is supposed to
+  remove some potential footguns from the typesystem.
+* Most use of closures have been [converted][unboxed] to 'unboxed
+  closures', the new, more flexible, closure model. As a result of API
+  changes some downstream code will break, the PR has detailed
+  instructions for the transition.
+* Slight adjustments have been made to the `fmt` API to make them
+  [safe][fmt]. These APIs are rarely used directly.
+* It's now [impossible to explicitly call the `call` method][call] of
+  the closure types without turning on a feature
+  gate. Futureproofing. Doesn't affect the normal calling syntax.
+* The `Option` and `Result` variants are [no longer reexported from
+  their respective modules][reexp]. This won't break most code
+  because the variants are part of the prelude.
+
+[optin]: https://github.com/rust-lang/rust/pull/19566
+[optin-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
+[fmt]: https://github.com/rust-lang/rust/pull/19506
+[call]: https://github.com/rust-lang/rust/pull/19587
+[reexp]: https://github.com/rust-lang/rust/pull/19653
+[unboxed]: https://github.com/rust-lang/rust/pull/19467
+
+## Other Changes
+
+* Barosl [taught bors how to do rollups][rollup]!!!!!
+* Type bounds can be [constrained by the type of an associated
+  type][assoc-eq], as in `fn sum_uints<I>(iter: I) where I: Iterator,
+  I::A = uint { ... }`. [RFC][assoc-eq-rfc].
+* Lifetime elision [works on unboxed closure type sugar][sugar].
+* The [testing guide][testing] has been overhauled.
+* [`unsafe impl` and `unsafe trait` have landed][unsafe] as port of
+  [OIBIT][oibit-rfc]. This is required to convert `Send` and `Sync`
+  into library types.
+* [`BTreeSet` implements `BitOr`, `BitAnd`, `BitXor`, and `Sub`][btreeset].
+* The `recursion_limit` attribute [can control how deeply various
+  algorithms in the compiler recurse][recur]. It can be used to
+  convince the typechecker to keep working on particularly complicated
+  types.
+* [`String` implements `FromIterator<&str>` and
+  `Extend<&str>`][extend], which means that iterators of `&str` can be
+  collected into or appended on to a single string, e.g. `let s:
+  String = vec!["foo", "bar"].collect();`, `let s = String::new();
+  s.extend(vec!["foo", "bar"]);`.
+* New `os::unix` and `os::windows` modules provide [platform-specific
+  interop with `std::io`][io].
+* The `TupleN` traits [are deprecated][tuplen] because tuple indexing
+  is part of the language.
+
+[testing]: http://doc.rust-lang.org/guide-testing.html
+[sugar]: https://github.com/rust-lang/rust/pull/19589
+[recur]: https://github.com/rust-lang/rust/pull/19466
+[btreeset]: https://github.com/rust-lang/rust/pull/19514
+[extend]: https://github.com/rust-lang/rust/pull/19626
+[io]: https://github.com/rust-lang/rust/pull/19169
+[assoc-eq]: https://github.com/rust-lang/rust/pull/19391
+[assoc-eq-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md#constraining-associated-types
+[tuplen]: https://github.com/rust-lang/rust/pull/19677
+[unsafe]: https://github.com/rust-lang/rust/pull/19703
+[oibit-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
+[rollup]: https://github.com/graydon/bors/pull/47
+
+## New Contributors
+
+* Aaron Weiss
+* Aidan Cully
+* Arthur Liao
+* bluss
+* Jon Haddad
+* Matt Murphy
+* Matt Windsor
+* Maxime Quandalle
+* Nafis
+
+# Approved RFC's
+
+None.
+
+# New RFC's
+
+* [505: API comment conventions][rfc505]. Standardizing current
+  conventions.
+* [507: Release channels take 2][rfc507]. Describes the release train,
+  feature staging and in this iteration merges stability attributes
+  with feature gates.
+* [509: Collections reform part 2][rfc509]. This RFC shores up the
+  finer details of collections reform. In particular, where the
+  previous RFC focused on general conventions and patterns, this RFC
+  focuses on specific APIs. It also patches up any errors that were
+  found during implementation of part 1. Some of these changes have
+  already been implemented, and simply need to be ratified.
+* [517: `io` and `os` reform][rfc517]. This RFC proposes a significant
+  redesign of the std::io and std::os modules in preparation for API
+  stabilization.
+* [519: Panicking tasks should abort process if not handled][rfc519].
+* [520: Change array syntax to prevent ambiguity introduced by RFC
+  439][rfc520]. An alternative to [RFC 498]rfc498] that fixes the
+  ambiguity by changing the array type syntax.
+* [522: Allow the `Self` type to be used in impls][rfc522]. In the
+  implemantion of a trait, instead of writing the explicit type for
+  which a trait is implemented, just write `Self`.
+
+[rfc498]: https://github.com/rust-lang/rfcs/pull/498
+[rfc505]: https://github.com/rust-lang/rfcs/pull/505
+[rfc507]: https://github.com/rust-lang/rfcs/pull/507
+[rfc509]: https://github.com/rust-lang/rfcs/pull/509
+[rfc517]: https://github.com/rust-lang/rfcs/pull/517
+[rfc519]: https://github.com/rust-lang/rfcs/pull/519
+[rfc520]: https://github.com/rust-lang/rfcs/pull/520
+[rfc522]: https://github.com/rust-lang/rfcs/pull/522
+
+# Community
+
+[rustbyexample.com](http://rustbyexample.com) is an [official rust-lang project][rbe]
+now. Contributions highly encouraged. [Reddit][rbe-reddit].
+
+[rbe]: https://github.com/rust-lang/rust-by-example
+[rbe-reddit]: https://www.reddit.com/r/rust/comments/2onzq0/rust_by_example_has_been_transferred_to_rustlang/
+
+## From the Team
+
+* [Rust 1.0: Scheduling the Trains][trains]. About the 1.0 release
+  schedule. [Reddit][trains-reddit]. [HN][trains-hn].
+* [Yehuda Katz and Steve Klabnik are joining the Rust Core
+  Team][core]. [Reddit][core-reddit]. [HN][core-hn].
+* [Weekly-meetings/2014-18-11][mtg]: process changes; box patterns;
+  macros; issues in FIXMEs; placement box. [Reddit][mtg-reddit].
+
+[trains]: http://blog.rust-lang.org/2014/12/12/1.0-Timeline.html
+[trains-reddit]: https://www.reddit.com/r/rust/comments/2p35dk/rust_10_scheduling_the_trains/
+[trains-hn]: https://news.ycombinator.com/item?id=8740751
+[core]: http://blog.rust-lang.org/2014/12/12/Core-Team.html
+[core-reddit]: https://www.reddit.com/r/rust/comments/2p47ee/yehuda_katz_and_steve_klabnik_are_joining_the/
+[core-hn]: https://news.ycombinator.com/item?id=8742953
+[mtg]: https://github.com/rust-lang/meeting-minutes/blob/master/weekly-meetings/2014-12-09.md
+[mtg-reddit]:
+
+## Blog Posts
+
+* [Fun with Threads][funthreads]: Comparing basic parallel programming in C and Rust, from a beginner's perspective. [Reddit][funthreads-reddit] 
+* [Rewriting Rust Serialization, Part 3: Introducing Serde][rustserial]: Part 3 of Erick's great series on serialization. [Reddit][rustserial-reddit] 
+* [Using Rust to Make a Safer Interface for Yahoo’s Fast MDBM Database][mdbm]: [Reddit][mdbm-reddit] 
+* [Bootstrapping Rust][bootstrapping]: A quick look at the issues of compiling a compiler written in itself. [Reddit][bootstrapping-reddit] 
+* [A Beginner’s Thoughts on Programming Languages (Part 2 — RAII, GC, Ownership, noexcept)][begginers]: [Reddit][begginers-reddit] 
+* [Working with AI behavior trees][behaviour]: Using some of the AI features found in Piston. [Reddit][behaviour-reddit] 
+
+
+### 24 Days of Rust continues!
+
+* [24 Days of Rust - racer][24days8]. [Reddit][24days8-reddit].
+* [24 Days of Rust - anymay][24days9]. [Reddit][24days9-reddit].
+* [24 Days of Rust - the glorious tau][24days10]. [Reddit][24days10-reddit].
+* [24 Days of Rust - postgres][24days11]. [Reddit][24days11-reddit].
+* [24 Days of Rust - image][24days12]. [Reddit][24days12-reddit].
+* [24 Days of Rust - uuid][24days13]. [Reddit][24days13-reddit].
+* [24 Days of Rust - nalgebra][24days14]. [Reddit][24days14-reddit].
+
+[funthreads]: http://jvns.ca/blog/2014/12/14/fun-with-threads/
+[funthreads-reddit]: http://www.reddit.com/r/rust/comments/2pabnd/diving_into_concurrency_trying_out_mutexes_and/
+[rustserial]: http://erickt.github.io/blog/2014/12/13/rewriting-rust-serialization/
+[rustserial-reddit]: http://www.reddit.com/r/rust/comments/2p85za/rewriting_rust_serialization_part_3_introducing/
+[mdbm]: http://erickt.github.io/blog/2014/12/13/rust-and-mdbm/
+[mdbm-reddit]: http://www.reddit.com/r/rust/comments/2p70sj/using_rust_to_make_a_safer_interface_for_yahoos/
+[bootstrapping]: http://aidancully.blogspot.com/2014/12/bootstrapping-rust.html
+[bootstrapping-reddit]: http://www.reddit.com/r/rust/comments/2ovuko/bootstrapping_rust/
+[begginers]: https://medium.com/@chcokr/a-beginners-thoughts-on-programming-languages-part-2-raii-gc-ownership-noexcept-1c08f5dfe353
+[begginers-reddit]: http://www.reddit.com/r/rust/comments/2ov7e2/a_beginners_thoughts_on_programming_languages/
+[behaviour]: http://blog.piston.rs/2014/12/09/working-with-ai-behavior-trees/
+[behaviour-reddit]: http://www.reddit.com/r/rust/comments/2orssg/working_with_ai_behavior_trees_piston/
+
+[24days8]: https://siciarz.net/24-days-of-rust-racer/
+[24days8-reddit]: https://www.reddit.com/r/rust/comments/2oo1n5/24_days_of_rust_racer/
+[24days9]: https://siciarz.net/24-days-of-rust-anymap/
+[24days9-reddit]: https://siciarz.net/24-days-of-rust-anymap/
+[24days10]: https://siciarz.net/24-days-of-rust-glorious-tau/
+[24days10-reddit]: https://www.reddit.com/r/rust/comments/2ow3jm/24_days_of_rust_the_glorious_tau/
+[24days11]: https://siciarz.net/24-days-of-rust-postgres/
+[24days11-reddit]: https://www.reddit.com/r/rust/comments/2ozzeg/24_days_of_rust_postgres/
+[24days12]: https://siciarz.net/24-days-of-rust-image/
+[24days12-reddit]: https://www.reddit.com/r/rust/comments/2p3mjf/24_days_of_rust_image/
+[24days13]: https://siciarz.net/24-days-of-rust-uuid/
+[24days13-reddit]: https://www.reddit.com/r/rust/comments/2p6kvf/24_days_of_rust_uuid/
+[24days14]: https://siciarz.net/24-days-of-rust-nalgebra/
+[24days14-reddit]: https://www.reddit.com/r/rust/comments/2pa7md/24_days_of_rust_nalgebra/
+
+## New Projects
+* [Elliptic Curve Crypto][ecc]: Elliptic curve arithmetic and cryptography library in pure Rust
+* [Rustache][rustache]: a flexible template engine for Rust
+* [checked_cast!][checked]: A small macro to deal with the libc typedef hell
+* [Iota][iota]: A simple text editor written in Rust
+* [Metafactory][metafactory]: value construction pipeline builder
+* [superchan][superchan]: A Rust crate containing types for sending data across a network
+* [wxRust][wxRust]: A Rust binding of the wxWidgets cross platform toolkit
+
+[ecc]: https://github.com/Bren2010/ecc
+[rustache]: http://rustache.github.io/
+[checked]: https://github.com/Jurily/rust-checked-cast
+[iota]: https://github.com/gchp/iota
+[metafactory]: https://github.com/Nercury/metafactory-rs
+[superchan]: https://github.com/dradtke/superchan
+[wxRust]: https://github.com/kenz-gelsoft/wxRust
+
+## Project Updates
+
+* [This Week in Servo 14][twis]. Servo has adopted [hyper]. [Reddit][twis-reddit].
+* [Servo meeting notes from Mozlandia][servo-mozlandia]. Notes from the workweek.
+* [Servo running on Firefox OS][fxos]. [Reddit][fxos-reddit].
+* [rusty-tags now supports emacs][rusty-tags]
+
+[twis]: http://blog.servo.org/2014/12/09/twis-14/
+[twis-reddit]: https://www.reddit.com/r/rust/comments/2orabe/this_week_in_servo_15/
+[hyper]: https://github.com/hyperium/hyper
+[servo-mozlandia]: https://groups.google.com/forum/#!topic/mozilla.dev.servo/zK2H8a2dTGQ
+[fxos]: https://twitter.com/larsberg_/status/539937229049581568
+[fxos-reddit]: https://www.reddit.com/r/rust/comments/2orhhh/servo_running_on_firefox_os/
+[rusty-tags]: https://github.com/dan-t/rusty-tags
+
+## Upcoming Events
+
+* There will be a [talk about Rust at PyCon][pycon].
+* [12/18 Bay Area Rust: Crypto][bay].
+
+[pycon]: https://us.pycon.org/2015/schedule/presentation/411/
+[bay]: http://www.meetup.com/Rust-Bay-Area/events/210632582/