Issues

• miscompile on Array.insert of zero-sized value via copying through a pointer that reads 1 byte from an undefined address

  triage needed
  Bug

  swiftlang/swift#93344 · Filter by author tayloraswift opened on Oct 15, 2026

• [Windows] Optimize the toolchain's build for faster PR testing

  swiftlang/swift#93330 · Filter by author charles-zablit opened on Oct 15, 2026
  2

  

• [cxx-interop] Undefined std::function copy constructor when a lambda captures a std::function

  swiftlang/swift#93328 · Filter by author mrousavy opened on Oct 15, 2026

• Android SDK 6.4.1: libswiftCore.so needs std::__hash_memory, which libc++_shared.so from NDK r27 and r28 does not provide

  Androidbuild
  swiftlang/swift#93320 · Filter by author niktishakov opened on Oct 15, 2026
  2

• [cxx-interop] Generated headers of two modules redefine TypeMetadataTrait for the same imported C++ type

  swiftlang/swift#93318 · Filter by author mrousavy opened on Oct 15, 2026

• [Sema] @_dynamicReplacement(for:) on a local function asserts in lookupReplacedDecl (declCtxt->isTypeContext()) before the "not in an extension" diagnostic is emitted

  crashtriage needed
  Bug

  swiftlang/swift#93317 · Filter by author YuanchengJiang opened on Oct 15, 2026

• [ClangImporter] Objective-C category members on final Swift classes are imported as open and fail AST verification

  swiftlang/swift#93306 · Filter by author AdamCmiel opened on Oct 15, 2026

• Ensure that we optimize the Windows x64 toolchain for Coffee Lake+

  buildWindows
  Task

  swiftlang/swift#93305 · Filter by author compnerd opened on Oct 15, 2026

• MemberImportVisibility rejects a nested C++ namespace that is declared in more than one Clang module

  swiftlang/swift#93296 · Filter by author mrousavy opened on Oct 14, 2026

• Spurious compiler warning passing an optional value to String.init(describingForTest:) in Embedded Swift

  bug
  Bug

  swiftlang/swift#93291 · Filter by author grynspan opened on Oct 14, 2026
  11

• [cxx-interop] swift::Optional and swift::Array of an imported C++ type fail to link outside the Swift module's image

  swiftlang/swift#93289 · Filter by author mrousavy opened on Oct 14, 2026

• Compile time grows quadratically with the number of top-level freestanding declaration macros like #Preview

  swiftlang/swift#93287 · Filter by author kylebshr opened on Oct 14, 2026

• OSSACompleteLifetime is visiting the availability boundary

  crashtriage needed
  Bug

  swiftlang/swift#93271 · Filter by author AzeemJiva opened on Oct 14, 2026

• Placeholders in enum patterns can silently miscompile

  compilermiscompilepattern matchingpatternstype checker
  Bug

  swiftlang/swift#93263 · Filter by author hamishknight opened on Oct 14, 2026
  

• Latest Windows Toolchain is DoA

  crashtriage neededWindows
  Bug

  swiftlang/swift#93257 · Filter by author jmschonfeld opened on Oct 13, 2026
  1

• Failed to produce diagnostic for Optional.none match with nil

  diagnostics qualitypattern matchingpatternstype checker
  Bug

  swiftlang/swift#93255 · Filter by author hamishknight opened on Oct 13, 2026

• [cxx-interop] error: cyclic dependency in module 'std': std -> _Builtin_intrinsics -> std

  triage needed
  Bug

  swiftlang/swift#93250 · Filter by author vsarunas opened on Oct 13, 2026

• [AutoDiff] crash in reverse-mode differentiation transform / IRGen for functions with a wrt [Double] (collection) parameter whose result is a multi-component value (tuple/struct) that includes the array

  AutoDiff
  Bug

  swiftlang/swift#93244 · Filter by author astrotuna201 opened on Oct 13, 2026

• [SILOptimizer] SemanticARCOpts removes the copy of a borrow accessor result whose self is an address, causing a use-after-free at -O

  triage needed
  Bug

  swiftlang/swift#93241 · Filter by author ChoKyuWon opened on Oct 13, 2026

• [SILOptimizer] CopyPropagation releases a failable init's self before a ~Copyable local's deinit; the deinit's unowned read traps at -O

  triage needed
  Bug

  swiftlang/swift#93240 · Filter by author ChoKyuWon opened on Oct 13, 2026

• Use-after-free: consume of a generic let on one branch destroys it before its use on the other branch (ConsumeOperatorCopyableAddressesChecker)

  triage needed
  Bug

  swiftlang/swift#93239 · Filter by author ChoKyuWon opened on Oct 13, 2026

• BoundsCheckOpts removes a required RawSpan/MutableRawSpan bounds check at -O: check_range and check_range_offset share one redundancy key

  triage needed
  Bug

  swiftlang/swift#93238 · Filter by author ChoKyuWon opened on Oct 13, 2026

• LoadableByAddress emits an ABI-changing convert_function for a retyped apply argument ("convert_function cannot change function ABI")

  crashtriage needed
  Bug

  swiftlang/swift#93237 · Filter by author ChoKyuWon opened on Oct 13, 2026

• [AutoDiff] Differentiation crashes in curry-thunk promotion when the callee is not a curry thunk

  crashtriage needed
  Bug

  swiftlang/swift#93236 · Filter by author ChoKyuWon opened on Oct 13, 2026

• OwnershipModelEliminator hits llvm_unreachable on mark_unresolved_non_copyable_value ("Found unhandled forwarding inst")

  crashtriage needed
  Bug

  swiftlang/swift#93235 · Filter by author ChoKyuWon opened on Oct 13, 2026