This commit is in preparation for eventual tier 2 status for the wasm32-wasip3 target. Initially this target will not have support for threads but it's expected to come ~later this year. Th...

其他人写rust：
unsafe {
…
}
日本人写rust：
不安です {
…
}

Proposal Problem statement The standard library has nearly no string manipulation that do not allocate (expect methods that give a substring like spit or trim families). This comes from the fact th...

Tracking issue: #159799
This PR allows declaring the attribute itself unsafe, rather than the impl:
#![feature(dropck_eyepatch)]

struct PerhapsLoosely<T>(T);

impl<#[unsafe(ma...

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The current definition is based on legacy cruft which no longer matter. Let's make it somewhat saner:

Outside Miri: be maximally accepting, use UnsafePinned and MaybeUni...

Taking a shared reference to c_void is never correct, and this impl should never have been added.
This is obviously a breaking change, so needs crater and FCP.
@rustbot label T-libs-api needs-fcp A...

Per a discussion with lang, it was decided that we want Box<T, A> to only be fundamental in T. Given that Box is the only fundamental type with two generic params, simply make it so o...

This is my initial take on the scope! and extend! operators proposed by @traviscross. I've done a bit of interpretation; the exact semantics will need to be discussed. Part of rust-lang/rus...

Empowering everyone to build reliable and efficient software. - [WIP] Polymorphization by camelid · Pull Request #160300 · rust-lang/rust

Not planning on un-drafting this until after #158734 lands.
The "prefer the smaller magnitude" change (#155473) had been applied pretty narrowly: just to option-like niches and ju...

This PR introduces the internal #[rustc_anti_fundamental] trait attribute to prevent downstream crates from implementing traits on non-local #[fundamental] types (such as Pin and Box).
Using this n...

Empowering everyone to build reliable and efficient software.

Tracking issue: #144419
@rustbot modify labels: +T-libs-api

this is a draft for now to show test failure in library/alloc/src/vec, i will update description accordingly as we decide what to do with this test

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Changes in this PR (apart from the LLVM update):

Updated cov-map tests due to minor ordering changes introduced in llvm/llvm-project@5931034. The affected tests are limited to L...

This PR removes the <T> From<!> for T reservation implementation added in #62661 and tracked in #64715 and #64631.
The reservation impl in question was added in order to...

Adds the repr(Swift) attribute, allowing direct representation of Swift structs.
Since rebasing on the latest main it probably doesn't compile anymore.
I'd like to gauge interest to...

This makes closures (and types like them: coroutines and coroutine closures) act like MaybeDangling. This means that the aliasing model will entirely ignore references and Boxes passed around as cl...

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The current code uses the ena crate in sub-optimal ways. Improving this gives big speed wins for the new trait solver on some benchmarks. Details in individual commits.
r? @lcnr

While working on #160813 I noticed TrustedLen is missing for the LinkedList, I suspected that other modules are missing the implementation too, so I wrote a small script to scan the project and fou...