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[SILOptimizer/CSE] Assertion failure: lazy property getter that binds dynamic Self is inlined into a closure with no self-metadata parameter

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

SIL

Status: Open.

Bug

#89186 In swiftlang/swift;

· DataCorrupted opened on May 15, 2026

compactMap { $0 as? Protocol } on [AnyObject?] causes SIGSEGV under -O, works under -Onone

Status: Open.

#89178 In swiftlang/swift;

· Julioacarrettoni opened on May 15, 2026

Despite using @preconcurrency: Passing closure as a 'sending' parameter risks causing data races between code in the current task and concurrent execution of the closure

@preconcurrencyFeature → attributes: The "preconcurrency" attributeFeature → attributes: The "preconcurrency" attribute

compilerThe Swift compiler itselfThe Swift compiler itself

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

Status: Open.

#89162 In swiftlang/swift;

· ahoppen opened on May 15, 2026

Result(catching:) async overload fails on wasi32

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

Status: Open.

Bug

#89155 In swiftlang/swift;

· ktoso opened on May 15, 2026

[Swift][Specialization] Assertion std::find(conformsTo) != conformsTo.end() in getTypeForSymbolRange when serializing @_specialize generic signature with ambiguous type used in associated type chain

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

#89154 In swiftlang/swift;

· YuanchengJiang opened on May 15, 2026

[Swift][CSBindings] Assertion duplicate binding in BindingSet::addBinding when type-checking tuple var with two opaque return types and overloaded local function

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

swift 6.4

tuplesFeature: tuplesFeature: tuples

type checkerArea → compiler: Semantic analysisArea → compiler: Semantic analysis

Status: Open.

Bug

#89152 In swiftlang/swift;

· YuanchengJiang opened on May 15, 2026

[Swift][Macros] Assertion isConcrete() in ProtocolConformanceRef::getConcrete when expanding @attached member macro on a subclass whose superclass has the same macro applied and the macro plugin is missing

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

#89151 In swiftlang/swift;

· YuanchengJiang opened on May 15, 2026

"Cannot dereference a null type!" with dodgy use of inference for generic typealiases

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

#89137 In swiftlang/swift;

· jrose-signal opened on May 14, 2026

Assertion failed: (targetIndex == params.size() && "invalid lifetime dependence target"), function operator() at TypeTransform.h:933

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

#89136 In swiftlang/swift;

· snej opened on May 14, 2026

Hole in region checker when bundling non-Sendable into an array.

actor isolationFeature → concurrency: Actor isolationFeature → concurrency: Actor isolation

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

#89134 In swiftlang/swift;

· mbrandonw opened on May 14, 2026

Invalid fix-it on unused optional binding when multiple conditions

compilerThe Swift compiler itselfThe Swift compiler itself

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

fix-itsFeature: diagnostic fix-itsFeature: diagnostic fix-its

good first issueGood for newcomersGood for newcomers

statementsFeature: statementsFeature: statements

swift 6.4

type checkerArea → compiler: Semantic analysisArea → compiler: Semantic analysis

Status: Open.

Bug

#89131 In swiftlang/swift;

· AnthonyLatsis opened on May 14, 2026

Improve diagnostic for missing try in for loop for AsyncSequence

compilerThe Swift compiler itselfThe Swift compiler itself

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

error handling

for-in loopsFeature: for-in loopsFeature: for-in loops

swift 6.4

type checkerArea → compiler: Semantic analysisArea → compiler: Semantic analysis

Status: Open.

#89124 In swiftlang/swift;

· hamishknight opened on May 14, 2026