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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

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

LLVM <code>nocapture</code> attribute is used incorrectly

A-codegenArea: Code generationArea: Code generation

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

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-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.

#137668 In rust-lang/rust;

· tmiasko opened on Feb 26, 2025

"accessible" terminology in with_exposed_provenance docs is misleading

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

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

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#137060 In rust-lang/rust;

· saethlin opened on Feb 15, 2025

CString being noalias is a footgun

A-boxArea: Our favorite opsem complicationArea: Our favorite opsem complication

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

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

T-langRelevant to the language teamRelevant to the language team

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#136770 In rust-lang/rust;

· theemathas opened on Feb 9, 2025

Support calling functions with SIMD vectors that couldn't be used in the caller

A-ABIArea: Concerning the application binary interface (ABI)Area: Concerning the application binary interface (ABI)

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

A-SIMDArea: SIMD (Single Instruction Multiple Data)Area: SIMD (Single Instruction Multiple Data)

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

T-opsemRelevant to the opsem teamRelevant to the opsem team

WG-llvmWorking group: LLVM backend code generationWorking group: LLVM backend code generation

Status: Open.

#132865 In rust-lang/rust;

· RalfJung opened on Nov 10, 2024