Tracking:

Tracking issue for RFC 3527: Associated const underscore #158944

TODOs for myself:

reconsider the design of AssocItem(s)..?
add more tests

r? @ghost

The feature gate for the issue is #![feature(macroless_generic_const_args)]. Using it requires #![feature(min_generic_const_args)] to be enabled as well. Background On stable, there are two kinds o...

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See rust-lang/compiler-team#
The first commit here adds an -Zpolonius=nll argument for tests and so people can disable alpha on nightly.

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Fixes #149745.
Following @jmillikin's suggestion, the builder logic now lives in the pre-existing non-generic methods taking &dyn fmt::Debug (where it used to exi...

ACP: None (happy to create one if requested!)
Tracking Issue: None
Feature Gate: core_time_instant
Background
Instant is currently provided by std as it has a platform specific internal representat...

The GNU Hurd project recently issued their Q2'2026 status report to outline recently development efforts

MCP: rust-lang/compiler-team#968

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.