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...

RFCs for changes to Rust. Contribute to nia-e/rfcs development by creating an account on GitHub.

RFCs for changes to Rust. Contribute to nikomatsakis/rfcs development by creating an account on GitHub.

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Add move($expr) syntax inside closures, async blocks, and generators. A move($expr) evaluates the expression at closure-creation time and captures the result by value. This gives ...

RFCs for changes to Rust. Contribute to notriddle/rust-rfcs development by creating an account on GitHub.

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Tracking Issue: #154046
Stabilization Report: #154046 (comment)
Blocked On: #160952
Description
This PR stabilizes a subset of the core_io feature, namely:

core::io (the modu...