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const-eval: full support for pointer fragments

I-lang-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

needs-fcpThis change is insta-stable, or significant enough to need a team FCP to proceed.This change is insta-stable, or significant enough to need a team FCP to proceed.

perf-regressionPerformance regression.Performance regression.

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language teamRelevant to the language team

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open (in progress).

rust-lang/rustnumber 144081

#144081 In rust-lang/rust;

· RalfJung opened on Jul 17, 2025

Destructor of packed structs can move dangling references.

A-destructorsArea: Destructors (`Drop`, …)Area: Destructors (`Drop`, …)

A-repr-packedArea: the naughtiest reprArea: the naughtiest repr

C-bugCategory: This is a bug.Category: This is a bug.

I-prioritizeIssue: Indicates that prioritization has been requested for this issue.Issue: Indicates that prioritization has been requested for this issue.

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#143411 In rust-lang/rust;

· theemathas opened on Jul 4, 2025

Tracking issue for release notes of #141260: Allow volatile access to non-Rust memory, including address 0

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

T-langRelevant to the language teamRelevant to the language team

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#142511 In rust-lang/rust;

· rustbot opened on Jun 14, 2025

· 

1.90.0

Can't use fn() for C binding if C uses sentinel value

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#141660 In rust-lang/rust;

· karolherbst opened on May 27, 2025

Missed optimization: multiple instances of a small struct don't reuse the stack allocation

A-codegenArea: Code generationArea: Code generation

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#141649 In rust-lang/rust;

· ohadravid opened on May 27, 2025

<code>&amp;raw const some_union.field</code> erroneously requires <code>unsafe</code>

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

T-langRelevant to the language teamRelevant to the language team

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#141264 In rust-lang/rust;

· kupiakos opened on May 19, 2025

Some platforms cannot provide strict IEEE-754 conformant subnormals due to real-time guarantees and/or hardware limitations

A-floating-pointArea: Floating point numbers and arithmeticArea: Floating point numbers and arithmetic

C-bugCategory: This is a bug.Category: This is a bug.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#139277 In rust-lang/rust;

· DemiMarie opened on Apr 2, 2025

dubious <code>&amp;raw const|mut value</code> compile error

A-raw-pointersArea: raw pointers, MaybeUninit, NonNullArea: raw pointers, MaybeUninit, NonNull

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#139156 In rust-lang/rust;

· Paladynee opened on Mar 30, 2025

core::ptr::replace implementation is unsound since Rust 1.80

C-bugCategory: This is a bug.Category: This is a bug.

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

T-langRelevant to the language teamRelevant to the language team

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#138351 In rust-lang/rust;

· orlp opened on Mar 11, 2025

Atomic*::as_ptr unnecessarily restricts operations on the pointer to atomic operations

A-atomicArea: Atomics, barriers, and sync primitivesArea: Atomics, barriers, and sync primitives

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#138246 In rust-lang/rust;

· briansmith opened on Mar 8, 2025

CopyProp miscompilation when src is moved more than once

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-bugCategory: This is a bug.Category: This is a bug.

I-miscompileIssue: Correct Rust code lowers to incorrect machine codeIssue: Correct Rust code lowers to incorrect machine code

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#137936 In rust-lang/rust;

· tmiasko opened on Mar 3, 2025

Decide what to do about <code>UnsafePinned</code> and safe <code>Pin::as_ref</code>

C-bugCategory: This is a bug.Category: This is a bug.

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

F-unsafe_pinned`#![feature(unsafe_pinned)]``#![feature(unsafe_pinned)]`

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

T-langRelevant to the language teamRelevant to the language team

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#137750 In rust-lang/rust;

· traviscross opened on Feb 27, 2025