Top rust issues

Warn about unused macro arms.

A-lint A-macros C-feature-request T-lang

cannot create local mono-item for DefId

A-codegen C-bug E-needs-mcve E-needs-test I-ICE I-monomorphization ICEBreaker-Cleanup-Crew P-medium T-compiler

Impossible case reached: src/librustc_ty/needs_drop.rs:111

A-async-await A-generators AsyncAwait-Triaged C-bug E-easy E-help-wanted E-needs-mcve I-ICE T-compiler

LLVM error: "Instruction does not dominate all uses!" on Windows

A-LLVM A-async-await A-codegen AsyncAwait-Triaged C-bug E-needs-mcve I-ICE ICEBreaker-Cleanup-Crew ICEBreaker-LLVM O-windows-msvc P-high T-compiler regression-from-stable-to-nightly

Optimize away bounds check in loop indexing into slice, given an assertion

A-LLVM C-enhancement I-slow T-compiler

Duplicate crate macros failing to differentiate

A-macros C-bug E-needs-test T-compiler

unwrap branches are not optimized away.

A-LLVM C-bug E-needs-mcve I-slow T-compiler

Miri: rename "undef" -> "uninit"

A-miri C-cleanup E-easy E-mentor T-compiler

Insufficient concurrency in the rust-lang-ci organization

A-github-actions C-bug T-infra

Tracking Issue for the slice::fill method

A-slice B-unstable C-tracking-issue Libs-Tracked T-libs