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Undesired isolation inference for implementations of implicitly <code>nonisolated(nonsending)</code> requirements

actorFeature → concurrency: `actor` declarationsFeature → concurrency: `actor` declarations

compilerThe Swift compiler itselfThe Swift compiler itself

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

nonisolated(nonsending)Feature → modifiers: The "nonisolated(nonsending)" modifierFeature → modifiers: The "nonisolated(nonsending)" modifier

swift 6.3

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

unexpected behaviorBug: Unexpected behavior or incorrect outputBug: Unexpected behavior or incorrect output

Status: Open.

Bug

#86944 In swiftlang/swift;

· AnthonyLatsis opened on Feb 2, 2026

Default actor isolation: "main actor-isolated conformance cannot be used in nonisolated context"

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

declarationsFeature: declarationsFeature: declarations

Status: Open.

Bug

#86943 In swiftlang/swift;

· Aquilosion opened on Feb 2, 2026

sourcekitd does not use the same module cache as the compiler on Windows

source toolingArea: IDE support, SourceKit, and other source toolingArea: IDE support, SourceKit, and other source tooling

SourceKitArea → source tooling: SourceKitArea → source tooling: SourceKit

test failure

test suiteArea: test suiteArea: test suite

WindowsPlatform: WindowsPlatform: Windows

Status: Open.

Bug

#86930 In swiftlang/swift;

· hnrklssn opened on Feb 2, 2026

[TypeChecker] Crashes during type checking protocol conformance which has a default value for associatedtype

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

#86928 In swiftlang/swift;

· FlickerSoul opened on Feb 2, 2026

Compiler crash: Found outside of lifetime use

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

#86924 In swiftlang/swift;

· tomasf opened on Feb 1, 2026

Swift 6.2.1 crash: Invalid conformance during SILGen with key‑path map in async test

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

#86917 In swiftlang/swift;

· DPrakashhh opened on Jan 31, 2026

Swift compiler crash compiling bridging header (SwiftGeneratePch) with C++ interop enabled

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

#86907 In swiftlang/swift;

· tomhamming opened on Jan 30, 2026

Internal compiler error when building swift-subprocess at ToT

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

ownershipFeature: Ownership modifiers and semanticsFeature: Ownership modifiers and semantics

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

verifier

WindowsPlatform: WindowsPlatform: Windows

Status: Open.

Bug

#86901 In swiftlang/swift;

· Steelskin opened on Jan 30, 2026

Non-sendable object is allowed to be passed from actor-isolated region to task region

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

Status: Open.

Bug

#86896 In swiftlang/swift;

· nickolas-pohilets opened on Jan 30, 2026

No diagnostic when constructing sendable existential using isolated conformance

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

Status: Open.

Bug

#86895 In swiftlang/swift;

· nickolas-pohilets opened on Jan 30, 2026

Misleading "Will never be executed" warning

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

Status: Open.

Bug

#86891 In swiftlang/swift;

· NikolaiRuhe opened on Jan 30, 2026

Failure to produce diagnostic when trying to decompose element of UnfoldSequence&lt;Element, State&gt;

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

Status: Open.

Bug

#86890 In swiftlang/swift;

· svmkr-dev opened on Jan 30, 2026