Rust周报 378(译)

• this-week-in-rust
• 日期：2021-02-17
• 原文：378 期

你好，欢迎再来一期本周的螃蟹行情！Rust是一种追求三位一体的系统语言：安全性、并发性和速度。这是它的进展和社区的每周总结。有什么要说的吗？推特@ThisWeekInRust或向我们发送请求。 想参与吗？我们热爱贡献.

这本周的螃蟹行情是在在 Github 上公开的。如果你在本周的问题中发现任何错误，请提交 PR。

Updates from Rust Community

本周没有新闻通讯。

Official

• Announcing Rust 1.50.0

Project/Tooling Updates

• IntelliJ Rust changelog #141
• rust-analyzer changelog #64
• A big release for relm

Observations/Thoughts

• The XDG 基础目录规范 and Rust
• Zero dependency images (of chaos) in Rust
• Examples of declarative style in Rust
• Rust 2030 Christmas list: Better cfg
• For the Love of Macros
• The Tokio Upgrade from 0.2 to 1.x
• Cranelift, Part 2: Compiler Efficiency, CFGs, and a Branch Peephole Optimizer
• [audio] building with rust: luca palmieri on truelayer and zero to production
• [audio] chats with james 008 - yoshua wuyts
• [video] rust 1.50 patch review

Rust Walkthroughs

• Actors with Tokio
• Building a microservice with Rust
• Rust is cool - Enums
• Rust CLI Game of Life tutorial - Part 2
• Calling Rust from a Cloudflare Worker
• Validating JSON input with Rust web services
• What would SQLite look like if written in Rust? – Part 1
• Generalizing over Generics in Rust (Part 1) - AKA 高阶类型 in Rust
• Procedural Macros: The Basics
• Building an OpenStreetMap app in Rust, Part II
• Look, Ma! No JS! - Compiling Rust to WebAssembly
• Simple ray tracer written in Rust from scratch
• 短示例合集 in Rust
• Zero to Production in Rust, Part 7.1 - Skeleton And Principles For A Maintainable Test Suite
• CCSS Devclub Rust Workshop（一站式 Rust 学习）
• [video] graphs in rust: let’s build a maze!

Miscellaneous

• Cleora - an ultra fast graph embedding tool written in Rust
• Cost-based query optimizations in multithreaded environments
• Writing our own Cheat Engine: Exact Value scanning
• What would SQLite look like if written in Rust? — Part 1

Crate of the Week

尽管没有提名，本周的箱子还是firestorm，一个快速的侵入式火焰图分析库。

无论如何，llogiq 对该建议感到非常满意。

提交下周的建议和投票！

Call for Participation

一直想为开源项目做贡献，但不知道从哪里开始？每周我们都会重点介绍 Rust 社区的一些任务，供您选择和开始！

其中一些任务也可能有导师，请访问任务页面以获取更多信息。

• Fuchsia - netstack3: Support stable interface IDs

如果您是 Rust 项目的所有者并且正在寻找贡献者，请提交任务这里。

Updates from Rust Core

共有 340 个拉取请求在上周合并

• parser: fix panic in ‘const impl’ recovery
• fix derived PartialOrd operators
• borrowck: 将 visited map 重构为一个 bitset
• 添加相似的 mut 方法，for for loop
• miri: Remove non-power-of-two SIMD vectors
• chalk: add Movability to Generator
• try fast_reject::simplify_type in coherence before doing full check（先执行一致性/统一检查，优化优化）
• 修复建议：introduce explicit lifetime
• make suggestion of changing mutability of arguments 更广泛
• optimize Vec::retain
• make Vec::split_at_spare_mut public
• BTreeMap: 解开 Drop implementation from IntoIter
• 直接在 heap，初始化 BTree nodes
• stabilize the partition_point feature
• add Box::into_inner
• stdsimd: add SIMD shuffles for SimdType{2, 4, 8, 16, 32, 64}
• stdsimd: add bitmasks and simplify mask API
• libtest: allow multiple filters
• cargo: change git dependencies to use HEAD by default
• cargo: 发出警告 on env variable case mismatch
• crates.io: add COM0 and LPT0 to the list of 保留的 crate names (Windows users rejoice)
• clippy: fix suggestions that need parens in from_iter_instead_of_collect lint
• clippy: fix missing_panics_doc warning on unreachable!
• clippy: fix vec_init_then_push false positives
• clippy: downgrade trivial_regex to nursery
• clippy: new lint: bytes_nth

Rust Compiler Performance Triage

尽管安静的一周，但在 bootstrap 时间方面有了很大的改善，但大部分时间都是安静的，由于正在编译的代码发生了变化，因此使总数量减少了几个百分点，而 rustc_middle 减少了 10％。

分类由 @simulacrum 完成。修订范围：ea09825..f1c47c7

1 个退步，2 个改进，1 个混合

Approved RFCs

对 Rust 的更改跟随 RustRFC (request for comments) process。以下是本周批准实施的 RFC：

本周未批准任何 RFC。

Final Comment Period

每周the team宣布即将做出决定的 RFC 和主要 PR 的“最终评论期”。立即发表您的意见。

RFCs

• Adds must_not_suspend_lint RFC
• RFC: Checking conditional compilation at compile time
• RFC: add the Freeze trait to libcore/libstd
• Generic Pointer to Field

Tracking Issues & PRs

• [disposition: merge] Make char and u8 methods const
• [disposition: merge] 降阶 x86_64-rumprun-netbsd target
• [disposition: merge] impl PartialEq<Punct> for char; symmetry for #78636
• [disposition: merge] 使 rustdoc lints 成为 a tool lint ，而不是 built-in
• [disposition: merge] Stabilize unsafe_op_in_unsafe_fn lint
• [disposition: merge] Add NotSupported to std::io::ErrorKind
• [disposition: merge] [librustdoc] Only split lang string on ,, , and \t
• [disposition: merge] Lint for unused borrows as part of UNUSED_MUST_USE
• [disposition: merge] 跟踪问题： str_split_once
• [disposition: merge] 跟踪问题： ASCII methods on OsStr
• [disposition: close] 跟踪问题： Option::expect_none(msg) and unwrap_none()

New RFCs

• Add named path bases to cargo

Quote of the Week

您是否看到有人用一只手杂耍了几件物品？这就是异步的意义。阻塞它就像书写一样（非异步）-每只手都需要不断地工作。如果您想以两倍的速度书写，则需要两只手同时书写。那就是多线程的。如果您玩杂耍，那么当物品离开您的手并悬停在空中时，您将无事可做。这就与网络 IO 类似 —— 您发出请求，只是在等待服务器响应。在此期间，您可能正在做一些事情，例如抓到另一个物品，然后再次扔回去。“ await”的意思就是 —— 我扔了起来，然后飞向空中，这时我想让现在的线程（或者说手）切换过来捕捉其他东西。

– /u/OS6aDohpegavod4 on /r/rust

Thanks to Jacob Pratt for the suggestion.

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, and cdmistman.

Discuss on r/rust