Feature flags 5.9

Upcoming

📖 How to enable

BareSlashRegexLiterals

• 🔍 Mentions in proposals

ConciseMagicFile

• 🔍 Mentions in proposals

DisableOutwardActorInference

• 🔍 Mentions in proposals

ExistentialAny

• 🔍 Mentions in proposals

ForwardTrailingClosures

• 🔍 Mentions in proposals

ImportObjcForwardDeclarations

• 🔍 Mentions in proposals

Experimental

📖 How to enable

MoveOnlyPartialConsumption

• 🔍 Mentions in proposals

MoveOnlyResilientTypes

• 🔍 Mentions in proposals

StrictConcurrency

• 🔍 Mentions in proposals
• 💡 An Introduction to Isolation in Swift
• 💡 Data-race safety in Swift 5.10
• 💡 The Swift Book: Concurrency
• 💡 How to determine where tasks and async functions run in Swift?

AccessLevelOnImport

• 🔍 Mentions in proposals

AdditiveArithmeticDerivedConformances

• 🔍 Mentions in proposals

BuiltinMacros

• 🔍 Mentions in proposals

BuiltinModule

• 🔍 Mentions in proposals

CodeItemMacros

• 🔍 Mentions in proposals

DifferentiableProgramming

• 🔍 Mentions in proposals

FlowSensitiveConcurrencyCaptures

• 🔍 Mentions in proposals

ForwardModeDifferentiation

• 🔍 Mentions in proposals

GenerateBindingsForThrowingFunctionsInCXX

• 🔍 Mentions in proposals

ImplicitSome

• 🔍 Mentions in proposals

ImportSymbolicCXXDecls

• 🔍 Mentions in proposals

LayoutPrespecialization

• 🔍 Mentions in proposals

MoveOnlyClasses

• 🔍 Mentions in proposals

MoveOnlyEnumDeinits

• 🔍 Mentions in proposals

MoveOnlyTuples

• 🔍 Mentions in proposals

NamedOpaqueTypes

• 🔍 Mentions in proposals

NoImplicitCopy

• 🔍 Mentions in proposals

OldOwnershipOperatorSpellings

• 🔍 Mentions in proposals

OneWayClosureParameters

• 🔍 Mentions in proposals

OpaqueTypeErasure

• 🔍 Mentions in proposals

ParserASTGen

• 🔍 Mentions in proposals

ParserDiagnostics

• 🔍 Mentions in proposals

ParserRoundTrip

• 🔍 Mentions in proposals

ParserValidation

• 🔍 Mentions in proposals

ReferenceBindings

• 🔍 Mentions in proposals

SendableCompletionHandlers

• 🔍 Mentions in proposals

StaticAssert

• 🔍 Mentions in proposals

TupleConformances

• 🔍 Mentions in proposals

ModuleInterfaceExportAs

• 🔍 Mentions in proposals

TypeWitnessSystemInference

• 🔍 Mentions in proposals

RuntimeDiscoverableAttrs

• 🔍 Mentions in proposals

Stable

Actors

actors

🔍 Mentions in proposals

AsyncAwait

async/await

🔍 Mentions in proposals

AttachedMacros

Attached macros

🔍 Mentions in proposals

BuiltinAssumeAlignment

Builtin.assumeAlignment

🔍 Mentions in proposals

BuiltinBuildComplexEqualityExecutor

Executor-building for 'complexEquality executor' builtins

🔍 Mentions in proposals

BuiltinBuildExecutor

Executor-building builtins

🔍 Mentions in proposals

BuiltinBuildMainExecutor

MainActor executor building builtin

🔍 Mentions in proposals

BuiltinContinuation

Continuation builtins

🔍 Mentions in proposals

BuiltinCopy

Builtin.copy()

🔍 Mentions in proposals

BuiltinCreateAsyncTaskInGroup

MainActor executor building builtin

🔍 Mentions in proposals

BuiltinCreateTaskGroupWithFlags

Builtin.createTaskGroupWithFlags

🔍 Mentions in proposals

BuiltinExecutor

Builtin.Executor type

🔍 Mentions in proposals

BuiltinHopToActor

Builtin.HopToActor

🔍 Mentions in proposals

BuiltinIntLiteralAccessors

Builtin.IntLiteral accessors

🔍 Mentions in proposals

BuiltinJob

Builtin.Job type

🔍 Mentions in proposals

BuiltinStackAlloc

Builtin.stackAlloc

🔍 Mentions in proposals

BuiltinTaskGroupWithArgument

TaskGroup builtins

🔍 Mentions in proposals

BuiltinTaskRunInline

Builtin.taskRunInline

🔍 Mentions in proposals

BuiltinUnprotectedAddressOf

Builtin.unprotectedAddressOf

🔍 Mentions in proposals

BuiltinUnprotectedStackAlloc

Builtin.unprotectedStackAlloc

🔍 Mentions in proposals

ConcurrentFunctions

@concurrent functions

🔍 Mentions in proposals

EffectfulProp

Effectful properties

🔍 Mentions in proposals

ExtensionMacroAttr

@attached(extension)

🔍 Mentions in proposals

ExtensionMacros

Extension macros

🔍 Mentions in proposals

FreestandingMacros

freestanding declaration macros

🔍 Mentions in proposals

GlobalActors

Global actors

🔍 Mentions in proposals

ImplicitSelfCapture

@_implicitSelfCapture attribute

🔍 Mentions in proposals

InheritActorContext

@_inheritActorContext attribute

🔍 Mentions in proposals

Macros

Macros

🔍 Mentions in proposals

MarkerProtocol

@_marker protocol

🔍 Mentions in proposals

MoveOnly

noncopyable types

🔍 Mentions in proposals

NewCxxMethodSafetyHeuristics

Only import C++ methods that return pointers (projections) on owned types as unsafe

🔍 Mentions in proposals

NoAsyncAvailability

@available(*, noasync)

🔍 Mentions in proposals

ParameterPacks

Value and type parameter packs

🔍 Mentions in proposals

PrimaryAssociatedTypes2

Primary associated types

🔍 Mentions in proposals

RethrowsProtocol

@rethrows protocol

🔍 Mentions in proposals

Sendable

Sendable and @Sendable

🔍 Mentions in proposals

SpecializeAttributeWithAvailability

@_specialize attribute with availability

🔍 Mentions in proposals

UnavailableFromAsync

@_unavailableFromAsync

🔍 Mentions in proposals

UnsafeInheritExecutor

@_unsafeInheritExecutor

🔍 Mentions in proposals

"Expression macros"

🔍 Mentions in proposals