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Does MaybeDangling<&[mut] T> make any requirements about the pointer's provenance?

Status: Open.

#605 In rust-lang/unsafe-code-guidelines;

· RalfJung opened on Mar 10, 2026

How far does repr(transparent)'s transparentness stretch in repr(Rust)?

A-layoutTopic: Related to data structure layout (`#[repr]`)Topic: Related to data structure layout (`#[repr]`)

S-not-opsemDespite being in this repo, this is not primarily a T-opsem questionDespite being in this repo, this is not primarily a T-opsem question

Status: Open.

#604 In rust-lang/unsafe-code-guidelines;

· Manishearth opened on Mar 7, 2026

How does Rust's provenance model interact with ARM MTE's hardware provenance?

Status: Open.

#603 In rust-lang/unsafe-code-guidelines;

· ais523 opened on Feb 10, 2026

Can we support stackful coroutines / fibers?

Status: Open.

#602 In rust-lang/unsafe-code-guidelines;

· RalfJung opened on Jan 29, 2026

Should regular assignments really retag?

A-aliasing-modelTopic: Related to the aliasing model (e.g. Stacked/Tree Borrows)Topic: Related to the aliasing model (e.g. Stacked/Tree Borrows)

Status: Open.

#601 In rust-lang/unsafe-code-guidelines;

· RalfJung opened on Jan 28, 2026

Is it possible to *ever* preserve padding bytes?

Status: Open.

#599 In rust-lang/unsafe-code-guidelines;

· clarfonthey opened on Jan 18, 2026

Is life-before-main / #[ctor] safe?

Status: Open.

#598 In rust-lang/unsafe-code-guidelines;

· madsmtm opened on Jan 13, 2026

We have a semantically relevant inlining pass?

Status: Open.

#597 In rust-lang/unsafe-code-guidelines;

· RalfJung opened on Jan 5, 2026

Is assignment to an uninit but non-Drop place okay?

Status: Open.

#596 In rust-lang/unsafe-code-guidelines;

· ChayimFriedman2 opened on Dec 30, 2025

Can we guarantee that repr(rust) union fields live at offset 0?

A-layoutTopic: Related to data structure layout (`#[repr]`)Topic: Related to data structure layout (`#[repr]`)

S-not-opsemDespite being in this repo, this is not primarily a T-opsem questionDespite being in this repo, this is not primarily a T-opsem question

T-lang

Status: Open.

#595 In rust-lang/unsafe-code-guidelines;

· joshlf opened on Dec 29, 2025

Are all referents contiguous?

Status: Open.

#594 In rust-lang/unsafe-code-guidelines;

· joshlf opened on Dec 23, 2025

Surprising behavior of aliasing model: mutable references that are transmuted into existence might not be "unique"

A-aliasing-modelTopic: Related to the aliasing model (e.g. Stacked/Tree Borrows)Topic: Related to the aliasing model (e.g. Stacked/Tree Borrows)

Status: Open.

#593 In rust-lang/unsafe-code-guidelines;

· RalfJung opened on Dec 11, 2025