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Tracking issue for release notes of #145954: stabilize extern_system_varargs

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-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-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.

#147001 In rust-lang/rust;

· rustbot opened on Sep 24, 2025

std: Add Motor OS std library port

A-tidyArea: The tidy toolArea: The tidy tool

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

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

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

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 (in progress).

rust-lang/rustnumber 147000

#147000 In rust-lang/rust;

· lasiotus opened on Sep 24, 2025

Rollup of 8 pull requests

A-compiletestArea: The compiletest test runnerArea: The compiletest test runner

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

rollupA PR which is a rollupA PR which is a rollup

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

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-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.

T-rust-analyzerRelevant to the rust-analyzer team, which will review and decide on the PR/issue.Relevant to the rust-analyzer team, which will review and decide on the PR/issue.

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 (in progress).

rust-lang/rustnumber 146999

#146999 In rust-lang/rust;

· matthiaskrgr opened on Sep 24, 2025

Cycle detected when optimizing MIR

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

I-cycleIssue: A query cycle occurred while none was expectedIssue: A query cycle occurred while none was expected

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

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.

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

Status: Open.

#146998 In rust-lang/rust;

· FlixCoder opened on Sep 24, 2025

undefined reference to __aeabi_unwind_cpp_pr0 on arm-unknown-linux-gnueabihf with no_std and -Cforce-unwind-tables=yes

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

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

O-ArmTarget: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 stateTarget: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state

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.

#146996 In rust-lang/rust;

· Enselic opened on Sep 24, 2025

Confusing suggestion when doing a conditional destructuring on a field of Deref struct

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

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.

#146995 In rust-lang/rust;

· Chocorean opened on Sep 24, 2025

Add clippy::unconditional_recursion to ./x clippy ci

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

Status: Draft (not ready).

rust-lang/rustnumber 146994

#146994 In rust-lang/rust;

· cuviper opened on Sep 24, 2025

Exporting a rustc_macro_transparency = "opaque" macro from std spams missing stability attribute errors

A-decl-macros-2-0Area: Declarative macros 2.0 (#39412)Area: Declarative macros 2.0 (#39412)

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

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

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

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.

requires-internal-featuresThis issue requires the use of internal features.This issue requires the use of internal features.

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.

Status: Open.

#146993 In rust-lang/rust;

· Jules-Bertholet opened on Sep 24, 2025

Improve source code for highlight.rs

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-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.

T-rustdoc-frontendRelevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.Relevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.

Status: Open (in progress).

rust-lang/rustnumber 146992

#146992 In rust-lang/rust;

· GuillaumeGomez opened on Sep 24, 2025

const_caller_location to use real Span instead of DUMMY_SP

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.

Status: Open (in progress).

rust-lang/rustnumber 146991

#146991 In rust-lang/rust;

· cachebag opened on Sep 24, 2025

Inhibit all-absent-variant optimization for all enum reprs that inhibit layout optimization, not just repr(C).

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.

Status: Open (in progress).

rust-lang/rustnumber 146989

#146989 In rust-lang/rust;

· zachs18 opened on Sep 24, 2025

Adding an assert! prevents bounds check elision

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

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.

Status: Open.

#146988 In rust-lang/rust;

· DCNick3 opened on Sep 24, 2025

impl Ord for params and use unstable sort

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.

Status: Open (in progress).

rust-lang/rustnumber 146987

#146987 In rust-lang/rust;

· hkBst opened on Sep 24, 2025

Add Amanjeev's personal email to mailmap

A-metaArea: Issues & PRs about the rust-lang/rust repository itselfArea: Issues & PRs about the rust-lang/rust repository itself

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

Status: Open (in progress).

rust-lang/rustnumber 146986

#146986 In rust-lang/rust;

· amanjeev opened on Sep 24, 2025

ICE: cannot convert '{erased} to a region vid

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) ❄️

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.

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.

#146985 In rust-lang/rust;

· matthiaskrgr opened on Sep 24, 2025

Uninhabited repr(uX) enum shouldn't have size zero

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

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

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

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.

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.

#146984 In rust-lang/rust;

· theemathas opened on Sep 24, 2025

Make normalization step in tests/run-make/linker-warning more robust

A-run-makeArea: port run-make Makefiles to rmake.rsArea: port run-make Makefiles to rmake.rs

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.

Status: Open (in progress).

rust-lang/rustnumber 146982

#146982 In rust-lang/rust;

· fmease opened on Sep 24, 2025

Update cargo submodule

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

Status: Open (in progress).

rust-lang/rustnumber 146981

#146981 In rust-lang/rust;

· weihanglo opened on Sep 24, 2025

simplify setup_constraining_predicates, and note it is potentially cubic

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.

Status: Open (in progress).

rust-lang/rustnumber 146980

#146980 In rust-lang/rust;

· hkBst opened on Sep 24, 2025

constify Default on Nanoseconds

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

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 (in progress).

rust-lang/rustnumber 146979

#146979 In rust-lang/rust;

· npmccallum opened on Sep 24, 2025

Emit error when using path-segment keyword as cfg pred

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

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.

Status: Open (in progress).

rust-lang/rustnumber 146978

#146978 In rust-lang/rust;

· mu001999 opened on Sep 24, 2025

Run-make test tests/run-make/linker-warning/ fails for me locally

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

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.

#146977 In rust-lang/rust;

· fmease opened on Sep 24, 2025

constify basic Clone impls

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

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 (in progress).

rust-lang/rustnumber 146976

#146976 In rust-lang/rust;

· npmccallum opened on Sep 24, 2025

Tracking Issue for new VecDeque methods prepend, extend_front, splice, extend_from_within and prepend_from_within

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

S-tracking-unimplementedStatus: The feature has not been implemented.Status: The feature has not been implemented.

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.

#146975 In rust-lang/rust;

· antonilol opened on Sep 24, 2025

panic=immediate-abort with build-std doesn't work: the crate core was compiled with a panic strategy which is incompatible

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

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.

Status: Open.

#146974 In rust-lang/rust;

· burningtnt opened on Sep 24, 2025