转载

Rust一周集锦（二）：7个项目更新及相关Meetup

欢迎来到这周的《Rust一周精彩回顾》，Rust是一种追求安全性、并发性和速度的系统语言。这是来自 http://this-week-in-rust.org /网站关于Rust的新的一周博文、活动、版本开发、贡献者的集锦。在此，我们转载了过来，以便国内Rust语言爱好者学习。

精彩博文：

Announcing Rust 1.2
Writing Unsafe and Low-Level Code in Rust
Creating a PHP Extension to Rust
Objective-C from Rust: objc_msgSend
A Simple Web App in Rust, Part 4 -- CLI Option Parsin
[video] The Rust Programming Language from Google TechTalks

新版发布和项目更新：

Check out the new unofficial German-language Rust forums
rust-cpp . Embed C++ directly inside your rust code.
rustty . A terminal UI library.
coalesce-rs . Combine disjoint types that share common traits.
mdBook . Create a book from markdown files.
Serde 0.5.0 adds support for bincode .
Cargo Crusader 0.1 . A tool for validating changes to APIs prior to publishing.

新的Rust贡献者名单：

Ivan Jager
Jan Likar
Marko Lalic
Matt Friedman
Mike Marcacci
Ruby
Tim Neumann

子团队报告：

每周 Rust团队会发布关于项目进度的报告，这里是这周报告的集锦。

Libs团队

Full report

上周的决定：

RFC PR #1184 : RFC: Stabilize the #![no_std] attribute
Merged
RFC PR #1183 : RFC: Allow changing the default allocator
Merged
RFC PR #770 : io error handling design
Closed
RFC PR #980 : read_exact
Merged
RFC PR #1194 : RFC: Add item recovery collection APIs
To be merged, pending last bits of bikeshedding
PR #26818 : Stabilize duration (with renamings)
Merge, need to decide about 1.3 backport

我们愿意让大家关注以下两个RFCs政策：

PR #1242 : RFC: policy for rust-lang crates
PR #1224 : Update the RFC process with sub-teams, amongst other things.

还有Rust中有关catch_panic 和安全案例的RFC：

PR #1236 : RFC: Stabilize catch_panic

这周的RFCs的讨论进入了最终阶段：

FCP PR #1195 : ordered query API
FCP PR #1192 : RFC for inclusive ranges with ...

Lang团队

Full report

以下是在最终讨论阶段提出的RFCs：

PR #886 : Permit #[must_use] attributes on functions as well as types. This allows for functions whose return value should not be ignored even if the type of that value is unexceptional (e.g., the ok() method of Result ).
PR #890 : Custom preludes. This RFC proposes an extension that allows crates to define their own preludes. This can be used to have common names available throughout a crate without forcing them to be explicitly imported everywhere. This is particularly useful when combined with the convention of having external crates define a pub mod prelude that downstream crates can import into their own local preludes. While clearly convenient, there were some concerns raised that this will give rise to multiple dialects of Rust.
PR #953 : This defines traits to support += and other operators, closing a gap in our operator overloading support. The traits take the LHS via an &mut reference to permit in-place updates, take the RHS by value, and do not require that the Add trait also be implemented.
PR #1135 : This PR permits raw fat pointers (e.g., *[i32] or *Trait ) to be compared, just like raw thin pointer (e.g., *i32 ). The semantics are to compare both the pointer itself and any accompanying data (e.g., the length of the slice).
PR #1189 : This PR simply corrects typos.

以下两个被接受：

PR #1214 : Clarify (and improve) rules for projections and well-formedness.
PR #1219 : Allow aliasing imports when importing as a group.

最终，我愿意把注意力放在这个RFC上：

PR #1238 : Nonparametric dropck. This RFC simplifies the dropck rules to close some soundness holes and make room for specialization. The change is expected to cause little to no breakage in practice, e.g., a crater run found no affected crates, but it nonetheless affects a core component of the language.

Compiler 团队

Full report

@arielb1 opened PR #27551 , which changes how structs and enums are represented in the compiler, replacing various hashtables with a single AdtDef struct. This is a reimplementation of a similar PR by @aatch. In addition to cleaner code, it results in a small performance boost (approximately 5%).

There has been some progress towards removing drop flags. @pnkfelix landed his "nonzeroing move hints" branch ( PR #26173 ). Unfortunately, some critical bugs were found shortly thereafter. The fix ( PR #27413 ) is not yet ready.

近期的Rust活动：