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Dec 15, 2021
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C/QotW + notable changes #2695

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88 changes: 50 additions & 38 deletions draft/2021-12-15-this-week-in-rust.md
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Expand Up @@ -28,9 +28,9 @@ If you find any errors in this week's issue, [please submit a PR](https://github

## Crate of the Week

This week's crate is [tap](https://crates.io/crates/tap), a library with extension traits to provide suffix-position pipeline behavior.
This week's crate is [efg](https://crates.io/crates/efg), a proc macro to allow boolean expression like syntax for `#[cfg]`s.

Thanks to [David Mason](https://users.rust-lang.org/t/crate-of-the-week/2704/988) for the suggestion!
Thanks to [farnbams](https://users.rust-lang.org/t/crate-of-the-week/2704/991) for the suggestion!

[Please submit your suggestions and votes for next week][submit_crate]!

Expand All @@ -49,37 +49,49 @@ If you are a Rust project owner and are looking for contributors, please submit

## Updates from the Rust Project

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

[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2021-11-29..2021-12-06

* [Optimize `rustc_lexer`](https://github.com/rust-lang/rust/pull/91393)
* [Add support for LLVM coverage mapping format versions 5 and 6](https://github.com/rust-lang/rust/pull/91207)
* [Add support for riscv64gc-unknown-freebsd](https://github.com/rust-lang/rust/pull/91284)
* [Fix ICE in `check_must_not_suspend_ty()`](https://github.com/rust-lang/rust/pull/91367)
* [Fix ICE when `yield`ing in function returning `impl Trait`](https://github.com/rust-lang/rust/pull/91488)
* [Don't suggest types whose inner type is erroneous](https://github.com/rust-lang/rust/pull/91450)
* [Only show notable traits if both types are the same](https://github.com/rust-lang/rust/pull/91366)
* [Improve diagnostic for missing half of binary operator in `if` condition](https://github.com/rust-lang/rust/pull/91435)
* [Improve error message for `E0659` if the source is not available](https://github.com/rust-lang/rust/pull/91298)
* [Improve error message for incorrect field accesses through raw pointers](https://github.com/rust-lang/rust/pull/91364)
* [Add `Option::inspect` and `Result::{inspect, inspect_err}`](https://github.com/rust-lang/rust/pull/91346)
* [Add a `try_reduce` method to the `Iterator` trait](https://github.com/rust-lang/rust/pull/87054)
* [Add slice `take` methods](https://github.com/rust-lang/rust/pull/88502)
* [Make `array::`{`try_from_fn`, `try_map`} and `Iterator::try_find` generic over `Try`](https://github.com/rust-lang/rust/pull/91286)
* [Introduce `RawVec::reserve_for_push`](https://github.com/rust-lang/rust/pull/91352)
* [Implement `VecDeque::retain_mut`](https://github.com/rust-lang/rust/pull/91215)
* [libc: Define `max_align_t` for wasi](https://github.com/rust-lang/libc/pull/2577)
* [portable-simd: Generic `core::ops` for `Simd<T, _>`](https://github.com/rust-lang/portable-simd/pull/195)
* [cargo: Stabilize `future-incompat-report`](https://github.com/rust-lang/cargo/pull/10165)
* [cargo: Support abbreviating `--release` as `-r`](https://github.com/rust-lang/cargo/pull/10133)
* [clippy: Consider `NonNull` as a pointer type](https://github.com/rust-lang/rust-clippy/pull/8074)
* [clippy: Escape backslash in `single_char_pattern.rs`](https://github.com/rust-lang/rust-clippy/pull/8067)
* [clippy: Fix `any()` not taking reference in `search_is_some` lint](https://github.com/rust-lang/rust-clippy/pull/7463)
* [clippy: Fix some false negatives for `single_char_pattern`](https://github.com/rust-lang/rust-clippy/pull/8077)
* [clippy: Parenthesize blocks in `needless_bool` suggestion](https://github.com/rust-lang/rust-clippy/pull/8066)
* [clippy: Upgrade `map_flatten` to complexity](https://github.com/rust-lang/rust-clippy/pull/8054)
* [rustfmt: Determine when new comment lines are needed for itemized blocks](https://github.com/rust-lang/rustfmt/pull/5097)
315 pull requests were [merged in the last week][merged]

[merged]: https://github.com/search?q=is%3Apr+org%3Arust-lang+is%3Amerged+merged%3A2021-12-06..2021-12-13

* [asm: allow using r9 (ARM) and x18 (AArch64) if they are not reserved by the current target](https://github.com/rust-lang/rust/pull/91643)
* [suggest using a temporary variable to fix borrowck errors](https://github.com/rust-lang/rust/pull/83174)
* [tweak "call this function" suggestion to have smaller span](https://github.com/rust-lang/rust/pull/91503)
* [tweak assoc type obligation spans](https://github.com/rust-lang/rust/pull/91769)
* [better span for unexpected normalization failure in CTFE engine](https://github.com/rust-lang/rust/pull/91815)
* [give more help in the unaligned_references lint](https://github.com/rust-lang/rust/pull/91718)
* [suggest casting between `i`/`u32` and `char`](https://github.com/rust-lang/rust/pull/91245)
* [add a suggestion if `macro_rules` is misspelled](https://github.com/rust-lang/rust/pull/91337)
* [avoid cloning refcounted types during folding](https://github.com/rust-lang/rust/pull/91353)
* [deduplicate projection sub-obligations](https://github.com/rust-lang/rust/pull/90423)
* [do not ICE when suggesting elided lifetimes on non-existent spans](https://github.com/rust-lang/rust/pull/91764)
* [do not add `;` to expected tokens list when it's wrong](https://github.com/rust-lang/rust/pull/91531)
* [do not attempt to suggest help for overly malformed struct/function call](https://github.com/rust-lang/rust/pull/91634)
* [improve 'cannot contain emoji' error](https://github.com/rust-lang/rust/pull/91476)
* [add `spin_loop` hint for RISC-V architecture](https://github.com/rust-lang/rust/pull/91548)
* [override `Iterator::advance`(`_back`)`_by` for `array::IntoIter`](https://github.com/rust-lang/rust/pull/91512)
* [replace dominators algorithm with simple Lengauer-Tarjan](https://github.com/rust-lang/rust/pull/85013)
* [add `<*{const|mut} T>::{to|from}_bits`](https://github.com/rust-lang/rust/pull/91127)
* [add `array::IntoIter::`{`empty`, `from_raw_parts`}](https://github.com/rust-lang/rust/pull/91341)
* [add `rsplit_array` variants to slices and arrays](https://github.com/rust-lang/rust/pull/91515)
* [make `Option::cloned` `const`](https://github.com/rust-lang/rust/pull/90741)
* [make `(*mut T)::write_bytes` `const`](https://github.com/rust-lang/rust/pull/91824)
* [make `Borrow` and `BorrowMut` impls `const`](https://github.com/rust-lang/rust/pull/90270)
* [make `Unique`s methods `const`](https://github.com/rust-lang/rust/pull/91806)
* [make `intrinsics::write_bytes` `const`](https://github.com/rust-lang/rust/pull/90081)
* [implement `TryFrom<&'_ mut [T]>` for `[T; N]`](https://github.com/rust-lang/rust/pull/91086)
* [implement `core::future::join!`](https://github.com/rust-lang/rust/pull/91645)
* [implement concat_bytes!](https://github.com/rust-lang/rust/pull/87599)
* [provide the `ReadBuf` abstraction](https://github.com/rust-lang/rust/pull/81156)
* [stabilise `feature(const_generics_defaults)`](https://github.com/rust-lang/rust/pull/90207)
* [stabilize `ControlFlow::`{`is_break`, `is_continue`}](https://github.com/rust-lang/rust/pull/91091)
* [stabilize `const_cstr_unchecked`](https://github.com/rust-lang/rust/pull/91855)
* [cargo: improve I/O error message for fingerprint of build script](https://github.com/rust-lang/cargo/pull/10191)
* [rustdoc: show type layout for type aliases](https://github.com/rust-lang/rust/pull/91682)
* [clippy: add new lint to warn when `#[must_use]` attribute should be used on a method](https://github.com/rust-lang/rust-clippy/pull/8071)
* [clippy: fix FP on `question_mark` if returned object is not local](https://github.com/rust-lang/rust-clippy/pull/8080)
* [clippy: fix `blocks_in_if_conditions` false positive](https://github.com/rust-lang/rust-clippy/pull/8100)
* [clippy: fix bad suggestion on `option_if_let_else` when there is complex subpat](https://github.com/rust-lang/rust-clippy/pull/8086)
* [clippy: ignore associated types in traits when considering type complexity](https://github.com/rust-lang/rust-clippy/pull/8030)

### Rust Compiler Performance Triage

Expand Down Expand Up @@ -165,13 +177,13 @@ Email the [Rust Community Team][community] for access.

# Quote of the Week

> v2 of the patch-series "to add support for Rust as a second language to the Linux kernel" was posted to LKML \[..\]
>
> There have been several improvements to the overall Rust support since RFC and v2 described in the linked mail.
> This is safer than you may think, because those who need async tend to know it themselves and
> don't ask "should I use async" question. In other words, asking itself is a signal that answer is
> no. MITM proxy case was a rare exception.

– [Thorsten Leemhuis on twitter](https://twitter.com/kernellogger/status/1467874273582886921?s=20)
– [Seo Sanghyeon on rust-users](https://users.rust-lang.org/t/examples-of-high-performance-rust-multi-thread-network-app-w-o-async/68513/4)

llogiq unanimously suggested and voted that this be our quote for this week.
Thanks to [Zeroexcuses](https://users.rust-lang.org/t/twir-quote-of-the-week/328/1146) 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