Issues

• 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

• The result of FloatingPoint.rounded(.toNearestOrEven) depends on the floating point environment

  macOSstandard library
  Bug

  swiftlang/swift#93220 · Filter by author nikolaykasyanov opened on Oct 13, 2026
  2

• Miscompile with -O and -Osize: an async closure that returns a tuple from both do and catch hands back the wrong first element (Swift 6.4, Xcode 27.0)

  swiftlang/swift#93209 · Filter by author BigD-FKC opened on Oct 13, 2026

• Task group child returning a (String, …) tuple from do/catch loses its result under -O

  swiftlang/swift#93208 · Filter by author letobao opened on Oct 13, 2026

• Distributed missing in Swift SDK for Static Linux?

  distributedLinux
  Bug

  swiftlang/swift#93195 · Filter by author jcubit opened on Oct 12, 2026
  5

• C++ interop: Data(std::vector<uint8_t>) crashes in swift::_getWitnessTable in -Onone builds (Swift 6.4, Xcode 27.0)

  swiftlang/swift#93184 · Filter by author RisingV opened on Oct 12, 2026

• Region isolation doesn't diagnose two non-escaping sending closure arguments that capture the same mutable variable

  triage needed
  Bug

  swiftlang/swift#93172 · Filter by author FranzBusch opened on Oct 12, 2026
  1

• String(std.string) fails to resolve depending on which other files share the frontend job (Swift 6.3.3, C++ interop)

  swiftlang/swift#93160 · Filter by author RisingV opened on Oct 11, 2026

• [Macros] #sourceLocation inside attached macro expansion does not update #line evaluation

  triage needed
  Bug

  swiftlang/swift#93159 · Filter by author agam1092005 opened on Oct 11, 2026

• sourcekitd crashes when concurrent requests expand macros through the in-process plugin server (data race in ParsedSyntaxRegistry's LRUCache)

  swiftlang/swift#93157 · Filter by author 9c5s opened on Oct 11, 2026

• [RequirementMachine] Conditional conformance that implies Sendable crashes in RequirementMachine::verify ("Term verification failed") when its same-type requirement makes the type's own requirements redundant

  compilercrashgeneric constraintsgenericsSendable
  Bug

  swiftlang/swift#93152 · Filter by author YuanchengJiang opened on Oct 10, 2026

• @NSManaged added by a member-attribute macro is ignored for @objc inference when an AnyObject lookup of the same name is type-checked first (-wmo)

  swiftlang/swift#93150 · Filter by author depth42 opened on Oct 10, 2026

• @MainActor and @Sendable are not applied to parenthesized function types

  triage needed
  Bug

  swiftlang/swift#93149 · Filter by author yimajo opened on Oct 10, 2026

• Swift 6.4: REPL: Fails to import Swift runtime module

  runtime
  Bug

  swiftlang/swift#93146 · Filter by author etcwilde opened on Oct 10, 2026
  3

• Misaligned load in synthesized enum hashValue on x86_64 Linux with UInt128 and UInt8 payload

  crashtriage needed
  Bug

  swiftlang/swift#93129 · Filter by author camunro opened on Oct 9, 2026
  4