Search results

Redundant Copies with #[repr(align)] Enum References

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size of generated code.

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.

Status: Open.

#140182 In rust-lang/rust;

· WindFrank opened on Apr 23, 2025

#[repr] on zero-variant enums leaves the reader with questions

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

A-enumArea: Enums (discriminated unions, or more generally ADTs (algebraic data types))Area: Enums (discriminated unions, or more generally ADTs (algebraic data types))

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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.

Status: Open.

#139703 In rust-lang/rust;

· Veykril opened on Apr 12, 2025

4 comments

ICE: fn_abi_of_instance(foo, []) failed: Layout(Unknown(Foo))

A-layoutArea: Memory layout of typesArea: Memory layout of types

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

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.

Status: Open.

#138008 In rust-lang/rust;

· matthiaskrgr opened on Mar 4, 2025

1 comment

repr(u8) appears on std documentation of c_void

A-cross-crate-reexportsArea: Documentation that has been re-exported from a different crateArea: Documentation that has been re-exported from a different crate

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

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

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

Status: Open.

#137440 In rust-lang/rust;

· geeklint opened on Feb 22, 2025

1



16k-aligned statics crash rustc on Windows

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

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-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

E-needs-investigationCall for partcipation: This issues needs some investigation to determine current statusCall for partcipation: This issues needs some investigation to determine current status

I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

O-windowsOperating system: WindowsOperating system: Windows

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.

Status: Open.

#135752 In rust-lang/rust;

· purplesyringa opened on Jan 20, 2025

4 comments

non-camel-case-types lint does not flag repr(C) types

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

L-non_camel_case_typesLint: non_camel_case_typesLint: non_camel_case_types

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

Status: Open.

#132925 In rust-lang/rust;

· jstarks opened on Nov 12, 2024

Internal SIMD layout specification is not flexible enough for SPIR-V

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

PG-portable-simdProject group: Portable SIMD (https://github.com/rust-lang/project-portable-simd)Project group: Portable SIMD (https://github.com/rust-lang/project-portable-simd)

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.

Status: Open.

#130405 In rust-lang/rust;

· fu5ha opened on Sep 15, 2024

4 comments

When a type is #[repr(simd)], #[repr(align(N))] annotations are ignored.

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

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.

Status: Open.

Bug

#130402 In rust-lang/rust;

· fu5ha opened on Sep 15, 2024

1

3 comments

Repr is incorrectly documented for structs with hidden field

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

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

Status: Open.

#128364 In rust-lang/rust;

· dtolnay opened on Jul 29, 2024

1

1 comment



repr(C) on an enum accepts discriminants that do not fit into the default C enum size

A-enumArea: Enums (discriminated unions, or more generally ADTs (algebraic data types))Area: Enums (discriminated unions, or more generally ADTs (algebraic data types))

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

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

O-windowsOperating system: WindowsOperating system: Windows

O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: Windows

Status: Open.

#124403 In rust-lang/rust;

· RalfJung opened on Apr 26, 2024

13 comments

improper_ctypes fails to trigger on invalid repr(transparent) types

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

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

L-improper_ctypesLint: improper_ctypesLint: improper_ctypes

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.

Status: Open.

#116959 In rust-lang/rust;

· workingjubilee opened on Oct 19, 2023

1 comment

repr_transparent_external_private_fields lint is not totally clear about what exactly triggers the lint

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

L-repr_transparent_external_private_fieldsLint: repr_transparent_external_private_fieldsLint: repr_transparent_external_private_fields

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.

Status: Open.

#115956 In rust-lang/rust;

· compiler-errors opened on Sep 19, 2023

improper_ctypes lint triggers on valid #[repr(transparent)] types

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

L-improper_ctypesLint: improper_ctypesLint: improper_ctypes

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.

Status: Open.

#115457 In rust-lang/rust;

· madsmtm opened on Sep 1, 2023

7 comments

ZST's layout leaks

A-crate-compatArea: Impacting SemVer compatibility of crates in the ecosystemArea: Impacting SemVer compatibility of crates in the ecosystem

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#114391 In rust-lang/rust;

· joshlf opened on Aug 2, 2023

1 comment

repr(transparent) newtypes do not preserved preferred alignment

A-layoutArea: Memory layout of typesArea: Memory layout of types

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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.

Status: Open.

#109560 In rust-lang/rust;

· RalfJung opened on Mar 24, 2023

#[repr(align(N))] fields not allowed in #[repr(packed(M>=N))] structs

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-layoutArea: Memory layout of typesArea: Memory layout of types

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

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

O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: Windows

Status: Open.

#100743 In rust-lang/rust;

· asahilina opened on Aug 19, 2022

18 comments

Should repr(transparent) require *inhabited* 1-ZSTs?

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#96921 In rust-lang/rust;

· scottmcm opened on May 10, 2022

13 comments

repr(C, align) is unsound on enums

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-enumArea: Enums (discriminated unions, or more generally ADTs (algebraic data types))Area: Enums (discriminated unions, or more generally ADTs (algebraic data types))

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#82101 In rust-lang/rust;

· mahkoh opened on Feb 14, 2021

32 comments

repr(C) on MSVC targets does not always match MSVC type layout when ZST are involved

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

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

O-windowsOperating system: WindowsOperating system: Windows

O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: Windows

P-mediumMedium priorityMedium priority

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#81996 In rust-lang/rust;

· mahkoh opened on Feb 11, 2021

1

129 comments

Test for repr-transparent-aggregates-1.rs fails cross-compiling wasm32-unknown-unknown with LLVM 11.0

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

O-wasmTarget: WASM (WebAssembly), http://webassembly.org/Target: WASM (WebAssembly), http://webassembly.org/

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.

Status: Open.

#81189 In rust-lang/rust;

· sundbry opened on Jan 19, 2021

1 comment

repr(transparent) should not consider non_exhaustive types as 1-ZSTs outside their crate

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

E-help-wantedCall for participation: Help is requested to fix this issue.Call for participation: Help is requested to fix this issue.

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

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#78586 In rust-lang/rust;

· scottmcm opened on Oct 30, 2020

1

22 comments

#[repr(transparent)] for str and String

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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.

Status: Open.

#70473 In rust-lang/rust;

· RReverser opened on Mar 27, 2020

11 comments

Tracking issue for future-incompatibility lint conflicting_repr_hints

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

C-future-incompatibilityCategory: Future-incompatibility lintsCategory: Future-incompatibility lints

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

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

Status: Open.

#68585 In rust-lang/rust;

· Centril opened on Jan 27, 2020

7 comments

repr(C) is not respected for enums with uninhabited variants

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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.

#68065 In rust-lang/rust;

· jswrenn opened on Jan 9, 2020

1 comment

Suggestion for incorrect repr use

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

A-suggestion-diagnosticsArea: Suggestions generated by the compiler applied by `cargo fix`Area: Suggestions generated by the compiler applied by `cargo fix`

D-papercutDiagnostics: An error or lint that needs small tweaks.Diagnostics: An error or lint that needs small tweaks.

P-lowLow priorityLow priority

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.

Status: Open.

#61286 In rust-lang/rust;

· estebank opened on May 28, 2019