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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

<code>#[repr]</code> 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

ICE: <code>fn_abi_of_instance(foo, [])</code> 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

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

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

non-camel-case-types lint does not flag <code>repr(C)</code> 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

When a type is <code>#[repr(simd)]</code>, <code>#[repr(align(N))]</code> 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

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

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

<code>improper_ctypes</code> fails to trigger on invalid <code>repr(transparent)</code> 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

<code>repr_transparent_external_private_fields</code> 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