Issues

• Lifetime requirements from calls and closures in unreachable code are not checked

  C-bugneeds-triage
  rust-lang/rust#164550 · Filter by author leeewee opened on Oct 19, 2026

• Old trait solver: item bounds of a default type are not checked when the impl header contains a projection

  C-bugneeds-triage
  rust-lang/rust#164548 · Filter by author leeewee opened on Oct 18, 2026

• Old trait solver: for<T> T: 'static (non-lifetime binder) is evaluated as true, which allows a 'static lifetime extension

  C-bugneeds-triage
  rust-lang/rust#164547 · Filter by author leeewee opened on Oct 18, 2026

• Polonius: passing an impl Trait value through a closure drops the borrow it captures

  C-bugneeds-triage
  rust-lang/rust#164546 · Filter by author leeewee opened on Oct 18, 2026

• Miscompile on aarch64-apple-darwin since LLVM 23: thin LTO with overflow checks breaks a PNG encode-decode roundtrip for fdeflate.

  A-LLVMA-LTOC-bugI-miscompileI-prioritizeneeds-triageO-AArch64regression-from-stable-to-stable
  rust-lang/rust#164536 · Filter by author LtdJorge opened on Oct 18, 2026
  5

• Cranelift miscompiles u128 jump tables that start past 2^63

  A-craneliftC-bugI-miscompileneeds-triagerequires-nightlyT-compiler
  rust-lang/rust#164534 · Filter by author saethlin opened on Oct 18, 2026

• Add CodegenBackend method to check supported features

  A-codegenC-cleanupC-tracking-issueT-compiler
  rust-lang/rust#164533 · Filter by author TechnoPorg opened on Oct 18, 2026
  1

  

• transmute in safe code via a dyn type that rustc incorrectly believes to be impossible

  A-dyn-traitA-type-systemC-bugI-prioritizeI-unsoundT-compilerT-types
  rust-lang/rust#164521 · Filter by author jsnell opened on Oct 18, 2026
  1

• [nightly] Reborrow through an overloaded DerefMut place is rejected with E0596

  C-bugF-reborrowT-compiler
  rust-lang/rust#164513 · Filter by author hazohelet opened on Oct 18, 2026

• New build failure in 1.99.x with NO_ATOMIC target in crossbeam-utils

  C-bugrequires-custom-configT-bootstrapT-libs
  rust-lang/rust#164512 · Filter by author he32 opened on Oct 18, 2026

• [nightly] soundness: Reborrow through a reference keeps the inner lifetime (two live &mut)

  A-lifetimesC-bugF-reborrowI-unsoundT-compiler
  rust-lang/rust#164510 · Filter by author hazohelet opened on Oct 18, 2026
  1

• Lifetime bounds bypassed via a projection in an associated const’s type

  A-associated-itemsA-implied-boundsA-lifetimesC-bugI-prioritizeI-unsoundregression-from-stable-to-stableS-has-bisectionT-types
  rust-lang/rust#164506 · Filter by author jsnell opened on Oct 18, 2026
  3

• Add a help in borrow checker for some strangly early bind closures

  A-borrow-checkerA-closuresA-diagnosticsD-lack-of-suggestionT-compiler
  rust-lang/rust#164504 · Filter by author A4-Tacks opened on Oct 18, 2026
  1

  

• Hangs at -O on a short loop followed by a %/min chain

  A-LLVMC-bugI-hangT-compiler
  rust-lang/rust#164499 · Filter by author zxt5 opened on Oct 18, 2026

• rustc -O takes over 20 minutes on nested loops with checked_add (1.98: under a second)

  A-LLVMC-bugI-compiletimeT-compiler
  rust-lang/rust#164498 · Filter by author zxt5 opened on Oct 18, 2026

• motor building failed due to missing set_hop_limit_v6 hop_limit_v6 method

  -Zbuild-stdC-bugO-motor-osT-libs
  rust-lang/rust#164496 · Filter by author Wyvern opened on Oct 18, 2026
  3

  

• hermit building failed due to IPV6_UNICAST_HOPS and IPV6_MULTICAST_HOPS missing

  -Zbuild-stdC-bugO-hermitT-libs
  rust-lang/rust#164495 · Filter by author Wyvern opened on Oct 18, 2026
  3

  

• Atomic float for better performance

  C-feature-requestF-gpu_offload
  rust-lang/rust#164493 · Filter by author yunz-qiao opened on Oct 18, 2026
  3

• [ICE]: expr: no entry found for key

  C-bugF-guard_patternsF-move_exprI-ICEneeds-triageT-compiler
  rust-lang/rust#164491 · Filter by author matthiaskrgr opened on Oct 17, 2026
  

• Tracking issue for release notes of #162264: Allow : after pat_param

  relnotesrelnotes-needs-reviewrelnotes-tracking-issueT-compilerT-langT-rustfmt
  rust-lang/rust#164487 · Filter by author rustbot opened on Oct 17, 2026

• Take::nth_back on an exhausted Take drains the inner iterator

  A-iteratorsC-bugT-libs
  rust-lang/rust#164481 · Filter by author hazohelet opened on Oct 17, 2026
  1

• Chain::nth(0) and next() disagree on a non-fused iterator: Skip::advance_by keeps its skip count

  A-iteratorsC-bugT-libs
  rust-lang/rust#164480 · Filter by author hazohelet opened on Oct 17, 2026
  4

• [ICE][beta]: "to get the signature of a closure, use args.as_closure().sig() not fn_sig()" while reporting a borrowck error

  A-borrow-checkerC-bugI-ICEI-prioritizeregression-from-stable-to-betaT-compilerT-types
  rust-lang/rust#164477 · Filter by author hazohelet opened on Oct 17, 2026
  1

  

• std::path::Components have disagreeing impls of PartialEq vs PartialOrd/Ord on windows

  A-filesystemC-bugO-windowsT-libs
  rust-lang/rust#164472 · Filter by author theemathas opened on Oct 17, 2026
  4

  

• PartialEq isn't transitive when comparing Path with str.

  A-filesystemC-bugT-libs
  rust-lang/rust#164470 · Filter by author theemathas opened on Oct 17, 2026
  2