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Region-based isolation checker fails when a closure capturing an enclosing local variable is passed to a function with an isolated parameter

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

Status: Open.

Bug

#88627 In swiftlang/swift;

· broken-circle opened on Apr 23, 2026

Test IRGen/async/run-call-void-to-existential.sil' is flakly on Windows

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

Status: Open.

Bug

#88626 In swiftlang/swift;

· hjyamauchi opened on Apr 23, 2026

value semantics of init with defaulted private let fields does not make sense

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

Status: Open.

Bug

#88619 In swiftlang/swift;

· tayloraswift opened on Apr 23, 2026

swift-frontend hangs indefinitely in SIL loop-invariant code motion pass on Xcode 26.4.1 (Swift 6.3.1)

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

Status: Open.

Bug

#88618 In swiftlang/swift;

· DevYeom opened on Apr 23, 2026

[Windows] [nightly-main] Unable to build dynamic library with code coverage enabled

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

Status: Open.

Bug

#88607 In swiftlang/swift;

· matthewbastien opened on Apr 22, 2026

Passing a reference to a variadic method to a closure argument crashes the compiler

ASTArea → compiler: The libSwiftAST libraryArea → compiler: The libSwiftAST library

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

Status: Open.

Bug

#88604 In swiftlang/swift;

· nikolaykasyanov opened on Apr 22, 2026

Test Concurrency/Runtime/async_taskgroup_asynciterator_semantics.swift is flaky on Windows

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

Status: Open.

Bug

#88599 In swiftlang/swift;

· hjyamauchi opened on Apr 21, 2026

CxxSet requiring init() is incorrect

c++ interopFeature: Interoperability with C++Feature: Interoperability with C++

Status: Open.

#88588 In swiftlang/swift;

· egorzhdan opened on Apr 21, 2026

Dispatch Global Executors crash when given a non-built in priority

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

#88584 In swiftlang/swift;

· benpious opened on Apr 21, 2026

Value types storing large InlineArray can have excessively large value witnesses

compilerThe Swift compiler itselfThe Swift compiler itself

InlineArrayArea → standard library: The `InlineArray` typeArea → standard library: The `InlineArray` type

run-time performance

SIL

swift 6.3

Status: Open.

Bug

#88579 In swiftlang/swift;

· allevato opened on Apr 21, 2026

[6.3.0] [Windows] [arm64] NoAssert toolchain appears to be creating and/or deploying Intel compiler

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

Status: Open.

Bug

#88578 In swiftlang/swift;

· carlpeto opened on Apr 21, 2026

No compiler diagnostic when an Optional returning method directly returns a chained optional expression of an incorrect type

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

Status: Open.

Bug

#88575 In swiftlang/swift;

· rwfii opened on Apr 21, 2026