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<code>unused_assignments</code> when writing to variable and then reading from its raw pointer

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

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.

L-unused_assignmentsLint: unused_assignmentsLint: unused_assignments

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.

#150656 In rust-lang/rust;

· Giftzwerg02 opened on Jan 3, 2026

ICE while formatting fluent string (<code>rustc --cfg foo="12xy"</code>)

A-cfgArea: `cfg` conditional compilationArea: `cfg` conditional compilation

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) ❄️

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.

#150654 In rust-lang/rust;

· anforowicz opened on Jan 3, 2026

Poor codegen for u64::isqrt()

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

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

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.

#150653 In rust-lang/rust;

· 10-hard-problems opened on Jan 3, 2026

ICE <code>expected region 'static to be of kind ReVar</code>

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) ❄️

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-nightlyPerformance or correctness regression from stable to nightly.Performance or correctness regression from stable to nightly.

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.

#150648 In rust-lang/rust;

· matthiaskrgr opened on Jan 3, 2026

<code>as_chunks</code> lead to unnecessary loop unrolling

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.

#150647 In rust-lang/rust;

· Evian-Zhang opened on Jan 3, 2026

Regression affecting <code>static-init</code> versions 1.0.1-1.0.3: "failed to resolve: use of unresolved module or unlinked crate <code>parking_lot</code>"

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-cargo-nominatedNominated for discussion during a cargo team meeting.Nominated for discussion during a cargo team meeting.

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

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this issue

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

Status: Open.

#150646 In rust-lang/rust;

· theemathas opened on Jan 3, 2026

Rustdoc <code>--sort-modules-by-appearance</code> sometimes doesn't respect order

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

requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.This issue requires a nightly compiler in some way. When possible, use a F-* label instead.

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.

#150634 In rust-lang/rust;

· crlf0710 opened on Jan 3, 2026

Followup work from making <code>ValTree</code> recurse through <code>ty::Const</code>

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

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.

#150624 In rust-lang/rust;

· BoxyUwU opened on Jan 2, 2026

MGCA: Check that const arguments in struct exprs are correctly typed

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

E-mentorCall for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.

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

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.

#150623 In rust-lang/rust;

· BoxyUwU opened on Jan 2, 2026

MGCA: support struct expressions with <code>..rest</code> patterns as direct const args?

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

S-blockedStatus: Blocked on something else such as an RFC or other implementation work.Status: Blocked on something else such as an RFC or other implementation work.

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.

#150622 In rust-lang/rust;

· BoxyUwU opened on Jan 2, 2026

MGCA: Avoid code duplication between HIR ty lowering and elsewhere

A-technical-debtArea: Internal cleanup workArea: Internal cleanup work

C-cleanupCategory: PRs that clean code up or issues documenting cleanup.Category: PRs that clean code up or issues documenting cleanup.

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

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

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.

#150621 In rust-lang/rust;

· BoxyUwU opened on Jan 2, 2026

Validate HIR ty lowering's produced generic parameters

A-technical-debtArea: Internal cleanup workArea: Internal cleanup work

C-cleanupCategory: PRs that clean code up or issues documenting cleanup.Category: PRs that clean code up or issues documenting cleanup.

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

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

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.

#150620 In rust-lang/rust;

· BoxyUwU opened on Jan 2, 2026