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lto=fat results in compressed RV64 instructions even when they are explicitly disabled

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.

#154436 In rust-lang/rust;

· nazar-pc opened on Mar 26, 2026

unused_assignments should provide more information for newcomers

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.

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

D-terseDiagnostics: An error or lint that doesn't give enough information about the problem at hand.Diagnostics: An error or lint that doesn't give enough information about the problem at hand.

L-unused_assignmentsLint: unused_assignmentsLint: unused_assignments

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.

#154434 In rust-lang/rust;

· estebank opened on Mar 26, 2026

run-make tests ignore --test-codegen-backend

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

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

A-test-infraArea: test infrastructure (may span bootstrap/compiletest/more)Area: test infrastructure (may span bootstrap/compiletest/more)

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

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: Open.

#154429 In rust-lang/rust;

· bjorn3 opened on Mar 26, 2026

[ICE]: Res::Err but no error emitted

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

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

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.

#154427 In rust-lang/rust;

· matthiaskrgr opened on Mar 26, 2026

[ICE]: Scalar layout for non-primitive non-enum type unsafe

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

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

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.

requires-debug-assertionsThis issue requires a build of rustc or tooling with debug-assertions in some wayThis issue requires a build of rustc or tooling with debug-assertions 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.

#154426 In rust-lang/rust;

· matthiaskrgr opened on Mar 26, 2026

[ICE]: discriminant_for_variant() is None

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

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

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.

requires-debug-assertionsThis issue requires a build of rustc or tooling with debug-assertions in some wayThis issue requires a build of rustc or tooling with debug-assertions 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.

#154424 In rust-lang/rust;

· matthiaskrgr opened on Mar 26, 2026

large_enums (EnumSizeOpt) MIR pass is unsound

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.

#154413 In rust-lang/rust;

· RalfJung opened on Mar 26, 2026

./x build failed with llvm-config: error: libLLVM-22-rust-1.96.0-nightly.dylib is missing

A-bootstrap-ci-llvmArea: bootstrap CI LLVMArea: bootstrap CI LLVM

A-contributor-roadblockArea: Makes things more difficult for new or seasoned contributors to RustArea: Makes things more difficult for new or seasoned contributors to Rust

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

O-AArch64Armv8-A or later processors in AArch64 modeArmv8-A or later processors in AArch64 mode

O-macosOperating system: macOSOperating system: macOS

P-highHigh priorityHigh priority

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.

Status: Open.

#154408 In rust-lang/rust;

· jieyouxu opened on Mar 26, 2026

assert_eq/assert_matches vs debug_assert_eq/debug_assert_matches have different temporary scoping behavior

A-destructorsArea: Destructors (`Drop`, …)Area: Destructors (`Drop`, …)

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

A-temporary-lifetime-extensionArea: temporary lifetime extensionArea: temporary lifetime extension

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

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.

#154406 In rust-lang/rust;

· theemathas opened on Mar 26, 2026

Misleading message while type mismatch with type alias

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

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

D-invalid-suggestionDiagnostics: A structured suggestion resulting in incorrect code.Diagnostics: A structured suggestion resulting in incorrect 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.

#154404 In rust-lang/rust;

· ywxt opened on Mar 26, 2026

[ICE]: expected type for param #1 in...

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.

#154403 In rust-lang/rust;

· Anonymous1-design opened on Mar 26, 2026

Async Send inference fails with PhantomData<*mut ()> + unsafe impl Send when T is a trait object

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.

#154397 In rust-lang/rust;

· sandersaares opened on Mar 26, 2026