Issues

• -Znext-solver Confusing item does not constrain {opaque}` diagnostics on overflowing opaques

  A-diagnosticsD-confusingF-type_alias_impl_traitT-compilerWG-trait-system-refactor
  rust-lang/rust#163784 · Filter by author ShoyuVanilla opened on Oct 5, 2026

• With GVN, Miri flags loads of a const packed struct field as insufficiently aligned

  A-mir-optC-bugI-miscompileI-prioritizeneeds-triageT-compiler
  rust-lang/rust#163782 · Filter by author saethlin opened on Oct 5, 2026
  1

• SsaRangePropagation propagates range information from optional asserts

  A-mir-optC-bugI-miscompileI-prioritizeregression-from-stable-to-stableT-compiler
  rust-lang/rust#163779 · Filter by author saethlin opened on Oct 5, 2026
  3

  

• ReferencePropagation looks through field projections to find reborrow chains, but not when replacing

  A-mir-optC-bugI-miscompileI-prioritizeneeds-triageT-compiler
  rust-lang/rust#163777 · Filter by author saethlin opened on Oct 5, 2026
  1

  

• [ICE]: unstable fingerprints for evaluate_obligation(d40445186fc295cc-99705675039751b2)

  C-bugE-needs-mcveI-ICEneeds-triageT-compiler
  rust-lang/rust#163760 · Filter by author Enet4 opened on Oct 4, 2026

• ./x check being killed (by rust-analyzer) may leave .git/index.lock file

  C-bugneeds-triageT-bootstrapT-rust-analyzer
  rust-lang/rust#163751 · Filter by author qouteall opened on Oct 4, 2026
  6

• Regression 1.98 → 1.99: thread_local! destructors no longer run at thread exit on wasm32-wasip1-threads

  A-thread-localsC-bugI-prioritizeO-wasiregression-from-stable-to-stableT-libs
  rust-lang/rust#163748 · Filter by author Brooooooklyn opened on Oct 4, 2026
  2

• [codegen] Matching on i32::cmp materializes Ordering instead of branching directly on comparison flags

  C-optimizationneeds-triage
  rust-lang/rust#163747 · Filter by author Yanwords opened on Oct 4, 2026

• Tracking Issue for movdir64b_target_feature and movdiri_target_feature

  A-target-featureC-tracking-issueneeds-triageS-tracking-unimplemented
  rust-lang/rust#163741 · Filter by author jlpetz opened on Oct 4, 2026

• Tracking Issue for non-ZST allocators

  C-tracking-issueS-tracking-unimplementedT-libs
  rust-lang/rust#163738 · Filter by author clarfonthey opened on Oct 4, 2026

• MergeFunctions + -Cpasses=sancov-module leaves coverage counters without a PC table (breaks cargo fuzz --build-std)

  A-LLVMC-bugF-linkageI-miscompile
  rust-lang/rust#163737 · Filter by author lbrooney opened on Oct 4, 2026
  2

• Safe code indexes with a negative i32 at opt-level=3 on x86_64-pc-windows-msvc: CodeGenPrepare hoists zext nneg above its sign guard

  A-LLVMC-bugI-miscompileI-prioritizeO-windowsT-compiler
  rust-lang/rust#163734 · Filter by author monochrome3694 opened on Oct 4, 2026
  2

• Optimized conditional struct construction returns unclamped i64 field

  A-LLVMC-bugE-needs-testI-miscompilellvm-fixed-upstreamT-compiler
  rust-lang/rust#163728 · Filter by author DavidCC00 opened on Oct 3, 2026
  5

• Instance::try_resolve uses queries which expect TypingMode::fully_monomorphized

  C-bugneeds-triagerequires-debug-assertionsT-types
  rust-lang/rust#163724 · Filter by author lcnr opened on Oct 3, 2026
  1

• rustdoc: impl From<OwnedHandle> for Dir is not shown

  C-bugneeds-triageT-rustdoc
  rust-lang/rust#163720 · Filter by author RalfJung opened on Oct 3, 2026
  4

  

• Tracking issue for release notes of #146099: Stabilize debug_closure_helpers

  needs-triagerelnotesrelnotes-needs-reviewrelnotes-tracking-issueT-compilerT-libsT-rustdoc
  rust-lang/rust#163716 · Filter by author rustbot opened on Oct 3, 2026 · 1.101.0

• Tracking issue for release notes of #157273: Stabilize optimize attribute

  A-attributesA-rustdoc-jsonneeds-triagerelnotesrelnotes-needs-reviewrelnotes-tracking-issueT-compilerT-lang
  rust-lang/rust#163715 · Filter by author rustbot opened on Oct 3, 2026
  1

• Tracking issue for release notes of #162460: Feat - #[inline(always)] + #[target_feature(enable = "....")] #2

  A-attributesA-LLVMneeds-triagerelnotesrelnotes-needs-reviewrelnotes-tracking-issueT-compilerT-lang
  rust-lang/rust#163712 · Filter by author rustbot opened on Oct 3, 2026

• Tracking issue for release notes of #139984: Tracking Issue for CStr::display

  F-cstr_displayrelnotesrelnotes-tracking-issueT-libs
  rust-lang/rust#163710 · Filter by author rustbot opened on Oct 3, 2026

• Tracking issue for release notes of #162761: Lower attributes for functions without bodies

  needs-triagerelnotesrelnotes-needs-reviewrelnotes-tracking-issueT-compilerT-lang
  rust-lang/rust#163709 · Filter by author rustbot opened on Oct 3, 2026 · 1.101.0

• Tracking issue for release notes of #163220: Performance regression in Criterion benchmark of AVX2 code on x86_64-pc-windows-msvc

  A-SIMDneeds-triageO-windows-msvcrelnotesrelnotes-needs-reviewrelnotes-tracking-issueT-compilerT-opsem
  rust-lang/rust#163708 · Filter by author rustbot opened on Oct 3, 2026

• x86-64 code looks too complex and not optimal for equality functions when simple bitwise comparison available.

  A-codegenA-LLVMC-optimizationI-slow
  rust-lang/rust#163707 · Filter by author spquix opened on Oct 3, 2026
  2

• Tracking issue for release notes of #162974: FCW for #[panic_handler] on unsafe fn.

  needs-triagerelnotesrelnotes-tracking-issueT-compilerT-lang
  rust-lang/rust#163706 · Filter by author rustbot opened on Oct 3, 2026 · 1.101.0

• Tracking issue for release notes of #163161: implement FCW for rustc_allowed_through_unstable_modules items

  needs-triagerelnotesrelnotes-needs-reviewrelnotes-tracking-issueT-clippyT-compilerT-lang
  rust-lang/rust#163705 · Filter by author rustbot opened on Oct 3, 2026 · 1.101.0

• Tracking issue for release notes of #162652: Syntactically reject leading parenthesized precise capturing lists in bare trait object types ((use<…>)+)

  relnotesrelnotes-tracking-issueT-compilerT-lang
  rust-lang/rust#163704 · Filter by author rustbot opened on Oct 3, 2026