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Compiler crash in CastOptimizer on as? Self in a class extension when the source is a bridged value type

Status: Open.

#88767 In swiftlang/swift;

· azarovalex opened on Apr 30, 2026

#unavailable should disable errors for obsoleted APIs

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

Status: Open.

Bug

#88763 In swiftlang/swift;

· keith opened on Apr 30, 2026

re-enable WMO on Swift builds on Windows

bootstrappingArea → utils → build-script: Bootstrapping schemesArea → utils → build-script: Bootstrapping schemes

build

build-scriptArea → utils: The build scriptArea → utils: The build script

WindowsPlatform: WindowsPlatform: Windows

Status: Open.

Task

#88762 In swiftlang/swift;

· compnerd opened on Apr 30, 2026

No String.contains(String) available in Embedded Swift

embeddedEmbedded SwiftEmbedded Swift

StringArea → standard library: The `String` typeArea → standard library: The `String` type

Status: Open.

Feature

#88756 In swiftlang/swift;

· grynspan opened on Apr 30, 2026

[Runtime] Release-mode async let aborts with "freed pointer was not the last allocation" on aarch64-swift-linux-musl SDK (Swift 6.3)

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

#88750 In swiftlang/swift;

· zyzikn opened on Apr 30, 2026

Static Linux SDK does not yet support C++ Interop

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

static stdlib

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

Status: Open.

Bug

#88742 In swiftlang/swift;

· ephemer opened on Apr 29, 2026

if expression with return in macro-expanded binding in closure crashes the compiler

closuresFeature: closuresFeature: closures

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

macro expansionsFeature → expressions: Macro expansion expressionsFeature → expressions: Macro expansion expressions

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

Status: Open.

#88740 In swiftlang/swift;

· hamishknight opened on Apr 29, 2026

MainActor is lost in an async function thereby causing a 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

#88731 In swiftlang/swift;

· Brett-Best opened on Apr 29, 2026

Incorrect ‘non-Sendable type’ error when passing isolated async closure to @concurrent function

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

Status: Open.

Bug

#88724 In swiftlang/swift;

· NotTheNHK opened on Apr 28, 2026

swiftc crash "Cannot initialize a nonCopyable type with a guaranteed value" in function forwardToInit at SILValue.h:375

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

#88717 In swiftlang/swift;

· snej opened on Apr 28, 2026

[cxx-interop] Defaulted in-class friend operator== causes undefined-symbol link error from Swift ==

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

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

Status: Open.

Bug

#88710 In swiftlang/swift;

· mrousavy opened on Apr 28, 2026

Misleading error about nonisolated not being applicable to mutable stored properties

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

compilerThe Swift compiler itselfThe Swift compiler itself

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

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

good first issueGood for newcomersGood for newcomers

swift 6.3

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

Status: Open.

Bug

#88709 In swiftlang/swift;

· AnthonyLatsis opened on Apr 28, 2026