Issues

• BPF: core: core::io::Error fails to compile at ISel with Cannot select: ... AtomicLoad

  A-atomicT-libs
  rust-lang/rust#165349 · Filter by author vadorovsky opened on Nov 2, 2026
  3

  

• Tracking issue for release notes of #162929: Update unicode_data to Unicode version 18.0.0

  A-Unicoderelnotesrelnotes-needs-reviewrelnotes-tracking-issueT-libs
  rust-lang/rust#165348 · Filter by author rustbot opened on Nov 2, 2026 · 1.100.0

• aarch64-pc-windows-msvc: safe Rust exits with 0xC0000409 after a caught panic at opt-level=1

  A-LLVMA-target-featureI-miscompileI-prioritizeO-aarch64-pc-windows-msvcT-compiler
  rust-lang/rust#165346 · Filter by author Mavrick-F opened on Nov 2, 2026

• mips64 fails tests/ui/abi/numbers-arithmetic/float-struct.rs

  -Zbuild-stdA-ABIA-floating-pointC-bugI-miscompileO-MIPST-compiler
  rust-lang/rust#165343 · Filter by author chenx97 opened on Nov 2, 2026

• TcpStream::connect_timeout may time out much earlier than the requested duration

  A-docsA-networkingA-timeC-bugO-linuxT-libs
  rust-lang/rust#165341 · Filter by author PaulDance opened on Nov 2, 2026
  1

• Inline asm: missing vzeroupper insertion for value-less out("ymmN") _ / out("zmmN") _ clobbers

  A-inline-assemblyA-LLVMC-bugT-compilerWG-llvm
  rust-lang/rust#165332 · Filter by author ctz opened on Nov 2, 2026

• GVN does not account for implicit retags during assignment

  A-mir-optA-mir-opt-GVNI-miscompileI-prioritizeI-unsoundT-compiler
  rust-lang/rust#165327 · Filter by author RalfJung opened on Nov 2, 2026

• Miscompilation with -C opt-level=2 -C codegen-units=1(but not with opt-level=3) due loop-vectorize llvm pass

  A-LLVMC-bugI-miscompileI-prioritizeT-compilerWG-llvm
  rust-lang/rust#165325 · Filter by author qarmin opened on Nov 2, 2026

• building *-l4re-uclibc targets failed

  -Zbuild-stdC-bugO-L4ReT-libs
  rust-lang/rust#165324 · Filter by author Wyvern opened on Nov 2, 2026
  1

• A !-typed constant in a zero-length array [C; 0] is never evaluated, but type checking treats it as diverging, so safe code executes unreachable

  A-arrayC-bugF-never_typeI-unsoundP-highT-compilerT-types
  rust-lang/rust#165323 · Filter by author leeewee opened on Nov 2, 2026
  2

• pin! in an if let guard of an or-pattern arm never drops the value pinned for the second alternative, which breaks Pin's drop guarantee

  A-destructorsA-patternsA-pinC-bugF-super_letI-memleakI-prioritizeI-unsoundT-compiler
  rust-lang/rust#165322 · Filter by author leeewee opened on Nov 2, 2026
  2

  

• Nightly 2026-10-01 regresses with new E0275: overflow evaluating requirement

  A-monomorphizationC-bugE-needs-mcveF-min_specializationI-cycleT-types
  rust-lang/rust#165319 · Filter by author chfogelman opened on Nov 2, 2026
  4

• Private import of public item in the form of use x::y::{self} displays self in public usages inside module on nightly

  A-local-reexportsC-bugT-rustdoc
  rust-lang/rust#165317 · Filter by author ZenPZero opened on Nov 2, 2026
  1

• saw_nul is never reset for std::process::Command on Linux

  A-processC-bugT-libs
  rust-lang/rust#165316 · Filter by author qwaz opened on Nov 2, 2026
  1

• std::process::Debug's non-ascii escaping behavior doesn't match its documentation

  A-docsA-processC-bugT-libs
  rust-lang/rust#165315 · Filter by author qwaz opened on Nov 2, 2026
  1

• RwLock writers get starved on Windows

  A-concurrencyC-optimizationI-slowO-windowsT-libs
  rust-lang/rust#165314 · Filter by author R3nzTheCodeGOD opened on Nov 2, 2026
  8

  

• Float patterns: an arm with -0.0 is skipped when the guard of an earlier 0.0 arm fails (wrong arm since 1.79)

  A-floating-pointA-patternsC-bugI-miscompileI-prioritizeregression-from-stable-to-stable
  rust-lang/rust#165311 · Filter by author leeewee opened on Nov 2, 2026
  3

• MIR optimizations and codegen evaluate the same constant under different where-clauses: type confusion in safe code at -O

  A-const-evalA-intrinsicsA-mir-optA-mir-opt-GVNC-bugI-miscompileI-prioritizeI-unsoundS-has-bisectionT-compilerT-types
  rust-lang/rust#165309 · Filter by author leeewee opened on Nov 2, 2026
  5

• Gen closures can hold a borrow of their own upvar across yield: the by-move body is not borrow-checked (use-after-free in safe code)

  A-borrow-checkerA-coroutinesC-bugI-unsoundrequires-nightlyT-compilerT-types
  rust-lang/rust#165308 · Filter by author leeewee opened on Nov 2, 2026

• rustc emits an incorrect byte count suffix on MSVC

  A-ABIneeds-triageO-windows
  rust-lang/rust#165299 · Filter by author folkertdev opened on Nov 1, 2026
  4

  

• missing/confusing documentation of behavior of str::{floor_char_boundary, ceil_char_boundary} when index > len

  A-docsneeds-triage
  rust-lang/rust#165295 · Filter by author ericseppanen opened on Nov 1, 2026

• nightly-only regression: borrows of #[thread_local]s can escape from functions

  A-borrow-checkerA-thread-localsC-bugF-thread_localI-unsoundT-compiler
  rust-lang/rust#165290 · Filter by author dianne opened on Nov 1, 2026
  

• Missing bounds check elision for integer formatting with feature = "optimize_for_size" and opt-level = "s"

  -Zbuild-stdA-fmtA-LLVMC-optimizationI-heavyT-compilerT-libs
  rust-lang/rust#165280 · Filter by author seritools opened on Nov 1, 2026
  2

  

• error: rustc interrupted by SIGSEGV, printing backtrace

  A-LLVMC-bugI-crashS-needs-reproT-compiler
  rust-lang/rust#165278 · Filter by author grcurtis27 opened on Nov 1, 2026
  1

• hexagon: values are passed incorrectly with extern "C"

  A-ABIA-codegenI-miscompileO-hexagon-unknown-linux-muslT-compiler
  rust-lang/rust#165255 · Filter by author folkertdev opened on Oct 31, 2026