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Dec 12, 2019
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84 changes: 48 additions & 36 deletions drafts/2019-12-10-this-week-in-rust.md
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Expand Up @@ -22,9 +22,9 @@ Find all #Rust2020 posts at [Read Rust](https://readrust.net/rust-2020/).

# Crate of the Week

This week's crate is [joinery](https://docs.rs/joinery), a library for generic string joining.
This week's crate is [StaticVec](https://github.com/slightlyoutofphase/staticvec), a nightly-only const-generics-backed fixed size vec crate.

Thanks to [Nathan West](https://users.rust-lang.org/t/crate-of-the-week/2704/677) for the suggestions!
Thanks to [ABagOfChips](https://users.rust-lang.org/t/crate-of-the-week/2704/682) for the suggestions!

[Submit your suggestions and votes for next week][submit_crate]!

Expand All @@ -46,35 +46,49 @@ If you are a Rust project owner and are looking for contributors, please submit

# Updates from Rust Core

264 pull requests were [merged in the last week][merged]

[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-11-25..2019-12-02

* [stabilize nested self receivers in 1.41.0](https://github.com/rust-lang/rust/pull/64325)
* [add memoization for const function evaluations](https://github.com/rust-lang/rust/pull/66294)
* [add crc and crypto to target feature whitelist on arm](https://github.com/rust-lang/rust/pull/66918)
* [conditional compilation for sanitizers](https://github.com/rust-lang/rust/pull/66245)
* [add support for sanitizer recover and tracking origins of uninitialized memory](https://github.com/rust-lang/rust/pull/66522)
* [async fn resume after completion](https://github.com/rust-lang/rust/pull/66321)
* [use structured suggestion when requiring `Copy` constraint in type param](https://github.com/rust-lang/rust/pull/66567)
* [various tweaks to diagnostic output](https://github.com/rust-lang/rust/pull/66754)
* [add version mismatch help message for unimplemented trait](https://github.com/rust-lang/rust/pull/66561)
* [AST address-of](https://github.com/rust-lang/rust/pull/66671)
* [initial implementation of or-pattern usefulness checking](https://github.com/rust-lang/rust/pull/66612)
* [polonius: illegal subset relation errors using placeholder loans](https://github.com/rust-lang/polonius/pull/137)
* [fix opaque types resulting from projections in function signature](https://github.com/rust-lang/rust/pull/66178)
* [simplify memory categorization](https://github.com/rust-lang/rust/pull/66246)
* [remove interior mutability in mir predecessors cache](https://github.com/rust-lang/rust/pull/64736)
* [rustc: move debug info from LocalDecl and UpvarDecl into a dedicated VarDebugInfo](https://github.com/rust-lang/rust/pull/56231)
* [create promoted MIR fragments for `const` and `static`s](https://github.com/rust-lang/rust/pull/66642)
* [alloc: add new_zeroed() versions like new_uninit()](https://github.com/rust-lang/rust/pull/66128)
* [impl TrustedLen for vec::Drain](https://github.com/rust-lang/rust/pull/66759)
* [atomic as_mut_ptr](https://github.com/rust-lang/rust/pull/66705)
* [implement Debug for MaybeUninit](https://github.com/rust-lang/rust/pull/65013)
* [libc: add support for shared memory operations for solaris/illumos](https://github.com/rust-lang/libc/pull/1584)
* [cargo: stabilize profile-overrides](https://github.com/rust-lang/cargo/pull/7591)
* [rustup: add toolchain install --allow-downgrade option](https://github.com/rust-lang/rustup/pull/2126)
* [docs.rs: match library properly if multiple crate-types are in use](https://github.com/rust-lang/docs.rs/pull/499)
247 pull requests were [merged in the last week][merged]

[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2019-12-02..2019-12-09

* [implement `#[track_caller]` attribute](https://github.com/rust-lang/rust/pull/65881) (RFC #[2091](https://rust-lang.github.io/rfcs/2091-inline-semantic.html))
* [syntax: unify macro and attribute arguments in AST](https://github.com/rust-lang/rust/pull/66935)
* [stdarch: add CRC32 detection to arm32](https://github.com/rust-lang/stdarch/pull/830)
* [fix `TypedArena` returning wrong pointers for recursive allocations](https://github.com/rust-lang/rust/pull/67003)
* [make `ForeignItem` an alias of `Item`](https://github.com/rust-lang/rust/pull/67114)
* [remove boxed closures in address parser](https://github.com/rust-lang/rust/pull/67085)
* [rustc: hide HirId's fmt::Debug output from -Z span_free_formats](https://github.com/rust-lang/rust/pull/66850)
* [make `process_obligations()` greedier](https://github.com/rust-lang/rust/pull/66408)
* [check break target availability when checking breaks with values](https://github.com/rust-lang/rust/pull/66863)
* [include a span in more `expected...found` notes](https://github.com/rust-lang/rust/pull/67011)
* [do not ICE on async fn with non-Copy inferred type arg](https://github.com/rust-lang/rust/pull/67004)
* [make try_mark_previous_green aware of cycles](https://github.com/rust-lang/rust/pull/66846)
* [add feature gate for mut refs in const fn](Add feature gate for mut refs in const fn)
* [change unused_labels from allow to warn](https://github.com/rust-lang/rust/pull/66325)
* [show the sign for signed ops on `exact_div`](https://github.com/rust-lang/rust/pull/66148)
* [chalk: convert ensure_answer_recursively to be iterative instead of recursive](https://github.com/rust-lang/chalk/pull/281)
* [handle diverging functions forwarding their return place](https://github.com/rust-lang/rust/pull/66827)
* [cleanup `BodyCache`](https://github.com/rust-lang/rust/pull/66991)
* [remove hack for top-level or-patterns in match checking](https://github.com/rust-lang/rust/pull/66967)
* [const-prop: fix ICE calculating enum discriminant](https://github.com/rust-lang/rust/pull/66960)
* [miri: tweak and use `OsStr` interfaces](https://github.com/rust-lang/miri/pull/1099)
* [only memoize const fn calls during const eval](https://github.com/rust-lang/rust/pull/66866)
* [miri: add flag to ignore memory leaks](https://github.com/rust-lang/miri/pull/1106)
* [better way to ignore tests in miri](https://github.com/rust-lang/miri/pull/1105)
* [codegen "unreachable" for invalid `SetDiscriminant`](https://github.com/rust-lang/rust/pull/67054)
* [codegen: Migrate to `LLVM`{`Get`, `Set`}`ValueName2`](https://github.com/rust-lang/rust/pull/67033)
* [update the minimum external LLVM to 7](https://github.com/rust-lang/rust/pull/66973)
* [implement illegal subset relations errors using Polonius](https://github.com/rust-lang/rust/pull/67016)
* [add `ExitStatusExt` into prelude](https://github.com/rust-lang/rust/pull/67041)
* [rename `bool::then_*` to `bool::to_option_*` and use where appropriate](https://github.com/rust-lang/rust/pull/65195)
* [add `{f32,f64}::approx_unchecked_to<Int>` unsafe methods](https://github.com/rust-lang/rust/pull/66841)
* [add test for `NAME` environment variable when `cargo new`](https://github.com/rust-lang/cargo/pull/7667)
* [cargo: remove `--offline` empty index error](https://github.com/rust-lang/cargo/pull/7655)
* [cargo: add a `--offline` hint](https://github.com/rust-lang/cargo/pull/7654)
* [rustdoc: less minification](https://github.com/rust-lang/rust/pull/66828)
* [rustfmt: switch to non-recursive mode by default](https://github.com/rust-lang/rustfmt/pull/3938)
* [rustup: output the previous version of a toolchain when it is updated](https://github.com/rust-lang/rustup/pull/2143)
* [rustup: resolve potential future shock (x.yyy.zz)](https://github.com/rust-lang/rustup/pull/2132)
* [crates.io: add audit trail to the publish, yank and unyank transactions](https://github.com/rust-lang/crates.io/pull/1700)

## Approved RFCs

Expand Down Expand Up @@ -136,13 +150,11 @@ Email the [Rust Community Team][community] for access.

# Quote of the Week

> > Heard recently creative coding experience which rust gives. What about unconscious coding experience - do whatever you can to make your code compile as late as you can, then go sleep and find your code correct and working in the morning
>
> Woah, I know people say the Rust compiler is slow but I never had a Rust program that took all night to compile☺
> So, in this regard and IMO, C++ has a saner model here. And if C++ is saner than you, that's not a good sign ☺

– [Maxim Vorobjov and ZiCog in our Quote of the Week Thread](https://users.rust-lang.org/t/twir-quote-of-the-week/328/749)
– [Boris Kolpackov on rust internals](https://internals.rust-lang.org/t/crate-dependency-discovery/11418/4)

Thanks to [both of them and mmmmib](https://users.rust-lang.org/t/twir-quote-of-the-week/328/752) for the suggestion!
Thanks to [UtherII](https://users.rust-lang.org/t/twir-quote-of-the-week/328/753) for the suggestion!

[Please submit quotes and vote for next week!](https://users.rust-lang.org/t/twir-quote-of-the-week/328)

Expand Down