Stabilize an MVP subset of the unstable Allocator trait as core::alloc::Alloc. This new trait provides memory allocation only (it can be considered a trait version of alloc / realloc / dealloc), an...

Implements MCP rust-lang/compiler-team#997
Based on #157166
In the current implementation, gen/async/async gen blocks and closures have type Coroutine(..) and CoroutineClosure(..). Those types impl...

This commit adds a new ABI string to the Rust compiler, "wasm-multivalue", which corresponds to a new ABI for WebAssembly defined at WebAssembly/tool-conventions#268. The purpose ...

Proposal Problem statement Currently any failure to allocate in Vec methods will call the global OOM handler which diverges (try_reserve is the one stable exception), Some users want to be able to ...

Windows Reactor is a UI library for Rust developers targeting WinUI 3 to deliver native, efficient Windows experiences.
Overview
windows-reactor brings a React-like component model to native Window...

Announcing stumpalo, an extremely fast bump allocator for rust, with chunk reuse and safe scoped stack support.

When a &Freeze reference is stored (with retag), emit !captures !{!"address", !"read_provenance"} metadata to indicate that it's UB to write thro...

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Want to follow along with Rust development? Curious how you might get involved? Take a look!

r? @fee1-dead
follow-up to #148820
I needed to add some more rustc code because turns out I forgot to add tests to the previous PR which actually codegen while using comptime fns. Check builds neve...

This is similar to an earlier PR I made for Thread::into_raw: #143859.
When using AtomicPtr for synchronization it's incredibly useful when you've got a couple bits you can stuff me...

Previously, the soundness argument for the pin!() macro relied on very complicated conditions on what coercions are possible. As a result, it was not obvious whether the macro was sound or not, and...

Continuation of: #115362
Quote from the previous PR:

This PR adds resolution and AST lowering for where clauses on binders. The meaning for for<T> now becomes for<T: Sized&amp...

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This PR implements rust-lang/rfcs#3943: a MIR optimization pass that eliminates unnecessary copies. Since the new pass relies on the new MIR semantics from RFC 3943, it is gated ...

This is an alternative approach to rust-lang/all-hands-2026#73. Unlike #157590 this uses wasmi + wasm32-wasip1. The advantage of this that it allows us to unconditionally depend on support for wasm...

This PR proposes the complete removal of the unstable feature arbitrary_self_types_pointers.
1. Introduction
The arbitrary_self_types_pointers feature (tracked under the same issue as arbitrary_sel...

Tracking issue: #130703
This PR is a proposal to resolve all of the concerns around the random feature by removing the most controversial parts in a future-compatible fashion.
RandomSource
The main...

This is work in progress

tracking issue: #140829
reference PR: rust-lang/reference#2300
closes #140829
Summary
An extern "custom" fn is a function with a custom ABI is unknown to rust. Often these are low...

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ACP: rust-lang/libs-team#755
Tracking issue: #154046
Blocked on: #155625
Blocked on: #155849
Description
Moves as much of std::io into core::io and alloc::io as practically po...