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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...

That time I found a rustc bug

This is a tracking issue for cleaning up early/late bound lifetimes in the compiler, most notably impacting turbofish syntax (e.g. some_fn::<'static>()). See t-types/#133, as well as the ...

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The OS is great at growing the stack on demand. All we need do is reserve an upper limit of virtual memory. Modern host systems have terabytes of virtual memory available to the ...

Tracking issue: #125418
The previous PR #158294 made function EIIs work on Windows MSVC. This PR fixes support for static EIIs, enabling full EII support on Windows MSVC.
The following fixes are in...

tracking issue: #126840

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Arti 2.5.0 is released and ready for download.

While discussing C++ overloading on Zulip, a bunch of us (re?)discovered a pretty cute idea, which I'm taking the liberty to flesh out here. This RFC comes from the realization that "we have named arguments at home" and "we have function overloading at…

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tracking issue: #154023
See also #t-compiler > representing `_Complex`. The RFC states that the Complex type should match the ABI of _Complex in C, but provides little det...

Why & how we rewrote Bun from Zig to Rust

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This commit removes/moves the tokens field from various AST node types, shrinking them. Details in individual commits.

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...