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<code>-Zregparm</code> doesn't put 64-bit arguments in registers

-ZregparmUnstable option: -Zregparm Unstable option: -Zregparm

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

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

O-x86_32Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686) Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)

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.

#145694 In rust-lang/rust;

· sulix opened on Aug 21, 2025

Tracking Issue for NUL-terminated file names with <code>#[track_caller]</code>

A-panicArea: Panicking machinery Area: Panicking machinery

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

disposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it. This issue / PR is in PFCP or FCP with a disposition to merge it.

I-lang-radarItems that are on lang's radar and will need eventual work or consideration. Items that are on lang's radar and will need eventual work or consideration.

I-libs-api-nominatedNominated for discussion during a libs-api team meeting. Nominated for discussion during a libs-api team meeting.

P-lang-drag-1Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang

proposed-final-comment-periodProposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off.

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.

#141727 In rust-lang/rust;

· Darksonn opened on May 29, 2025

<code>fn_cast!</code> macro

A-control-flow-integrityArea: Control Flow Integrity (CFI) security mitigation Area: Control Flow Integrity (CFI) security mitigation

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

A-sanitizersArea: Sanitizers for correctness and code quality Area: Sanitizers for correctness and code quality

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

I-lang-radarItems that are on lang's radar and will need eventual work or consideration. Items that are on lang's radar and will need eventual work or consideration.

PG-exploit-mitigationsProject group: Exploit mitigations Project group: Exploit mitigations

T-langRelevant to the language team Relevant to the language team

Status: Open.

#140803 In rust-lang/rust;

· Darksonn opened on May 8, 2025

Tracking Issue for <code>-Zsanitize-kcfi-arity</code>

A-control-flow-integrityArea: Control Flow Integrity (CFI) security mitigation Area: Control Flow Integrity (CFI) security mitigation

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

A-sanitizersArea: Sanitizers for correctness and code quality Area: Sanitizers for correctness and code quality

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

PG-exploit-mitigationsProject group: Exploit mitigations Project group: Exploit mitigations

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.

#138311 In rust-lang/rust;

· ojeda opened on Mar 10, 2025

experiment with relaxing the orphan rule

A-coherenceArea: Coherence Area: Coherence

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

I-lang-radarItems that are on lang's radar and will need eventual work or consideration. Items that are on lang's radar and will need eventual work or consideration.

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

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 team Relevant to the language team

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

Status: Open.

#136979 In rust-lang/rust;

· BennoLossin opened on Feb 13, 2025

Tracking issue for rustdoc <code>--output-format=doctest</code> command-line flag

A-doctestsArea: Documentation tests, run by rustdoc Area: Documentation tests, run by rustdoc

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

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.

#134529 In rust-lang/rust;

· GuillaumeGomez opened on Dec 19, 2024

Tracking Issue for <code>-Zregparm</code>

-ZregparmUnstable option: -Zregparm Unstable option: -Zregparm

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

A-CLIArea: Command-line interface (CLI) to the compiler Area: Command-line interface (CLI) to the compiler

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

O-x86_32Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686) Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)

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.

#131749 In rust-lang/rust;

· azhogin opened on Oct 15, 2024

<code>--extern mycrate=path/to/my/crate/with/random.suffix</code> fails with "file name should be lib*.rlib or lib*.so"

A-cratesArea: Crates and their interactions (like crate loading) Area: Crates and their interactions (like crate loading)

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

E-needs-designThis issue needs exploration and design to see how and if we can fix/implement it This issue needs exploration and design to see how and if we can fix/implement it

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.

#131720 In rust-lang/rust;

· tamird opened on Oct 15, 2024

<code>rustdoc</code> lint to flag potential intra-doc links

A-intra-doc-linksArea: Intra-doc links, the ability to link to items in docs by name Area: Intra-doc links, the ability to link to items in docs by name

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-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

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.

#131510 In rust-lang/rust;

· ojeda opened on Oct 10, 2024

Missed optimization/perf oddity with allocations

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

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

Status: Open.

#128854 In rust-lang/rust;

· peterwmwong opened on Aug 8, 2024

<code>-Cstack-alignment</code>/<code>-Cpreferred-stack-boundary</code> support in <code>rustc</code>

A-CLIArea: Command-line interface (CLI) to the compiler Area: Command-line interface (CLI) to the compiler

A-codegenArea: Code generation Area: 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.

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

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.

#128833 In rust-lang/rust;

· ojeda opened on Aug 8, 2024

<code>-Calign-loops=1</code> support in <code>rustc</code>

A-CLIArea: Command-line interface (CLI) to the compiler Area: Command-line interface (CLI) to the compiler

A-codegenArea: Code generation Area: 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.

A-rust-for-linuxRelevant for the Rust-for-Linux project Relevant for the Rust-for-Linux project

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

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.

#128832 In rust-lang/rust;

· ojeda opened on Aug 8, 2024