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Compiler always considers values captured by a nonisolated(nonsending) closure as nonisolated(nonsending) task-isolated

triage neededThis issue needs more specific labelsThis issue needs more specific labels

Status: Open.

Bug

#89457 In swiftlang/swift;

· rayx opened on May 27, 2026

unsupported upcast on macro aliases

WindowsPlatform: WindowsPlatform: Windows

Status: Open.

Bug

#89456 In swiftlang/swift;

· compnerd opened on May 27, 2026

[stdlib] Missing alignment and bounds validation in _DebuggerSupport.stringForPrintObject(_:mangledTypeName:)

triage neededThis issue needs more specific labelsThis issue needs more specific labels

Status: Open.

Bug

#89453 In swiftlang/swift;

· arunmanni-ai opened on May 27, 2026

[stdlib] Missing bounds check in UnsafeMutableRawBufferPointer.init(rebasing:) vs UnsafeRawBufferPointer.init(rebasing:)

triage neededThis issue needs more specific labelsThis issue needs more specific labels

Status: Open.

Bug

#89452 In swiftlang/swift;

· arunmanni-ai opened on May 27, 2026

[RBI] Capturing isolated parameter allows disconnected value to be sent twice

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

compilerThe Swift compiler itselfThe Swift compiler itself

concurrencyFeature: umbrella label for concurrency language featuresFeature: umbrella label for concurrency language features

region-based isolation checker

Status: Open.

Bug

#89435 In swiftlang/swift;

· NotTheNHK opened on May 26, 2026

SILGen crash on redundant typed catch inside typed-throws function

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

triage neededThis issue needs more specific labelsThis issue needs more specific labels

Status: Open.

Bug

#89431 In swiftlang/swift;

· Vithanco opened on May 26, 2026

[Windows] [Backtracing] Fix occasional issue demangling C++ names

triage neededThis issue needs more specific labelsThis issue needs more specific labels

Status: Open.

Bug

#89426 In swiftlang/swift;

· carlpeto opened on May 26, 2026

unexpected ',' separator diagnostic does not point to , token

compilerThe Swift compiler itselfThe Swift compiler itself

diagnostics qualityBug: The quality of compiler diagnosticsBug: The quality of compiler diagnostics

parserArea → compiler: The legacy C++ parserArea → compiler: The legacy C++ parser

swift 6.4

Status: Open.

Bug

#89405 In swiftlang/swift;

· hnrklssn opened on May 25, 2026

[IRGen][6.2 regression] Inverse-only existential emits swift_getExtendedExistentialTypeMetadata, crashing on iOS 15

Status: Open.

#89402 In swiftlang/swift;

· xjchuan opened on May 25, 2026

[RBI] A nonisolated(nonsending) closure taking another nonisolated(nonsending) closure as parameter could cause data race

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

compilerThe Swift compiler itselfThe Swift compiler itself

concurrencyFeature: umbrella label for concurrency language featuresFeature: umbrella label for concurrency language features

region-based isolation checker

Status: Open.

Bug

#89399 In swiftlang/swift;

· rayx opened on May 25, 2026

Assertion failed: (inserted), function addFix at ConstraintSystem.cpp

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

compilerThe Swift compiler itselfThe Swift compiler itself

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

expressionsFeature: expressionsFeature: expressions

Status: Open.

Bug

#89398 In swiftlang/swift;

· YuanchengJiang opened on May 25, 2026

[Embedded] Defining external dependencies in Swift causes a compiler crash.

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

triage neededThis issue needs more specific labelsThis issue needs more specific labels

Status: Open.

Bug

#89396 In swiftlang/swift;

· SP2G50000 opened on May 24, 2026