Feature flags 5.9

Upcoming

📖 How to enable

BareSlashRegexLiterals

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ConciseMagicFile

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DisableOutwardActorInference

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ExistentialAny

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• 💡 Swift Diagnostics: Existential any

ForwardTrailingClosures

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ImportObjcForwardDeclarations

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Experimental

📖 How to enable

LayoutPrespecialization

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MoveOnlyPartialConsumption

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MoveOnlyResilientTypes

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SendableCompletionHandlers

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StrictConcurrency

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• 💡 An Introduction to Isolation in Swift
• 💡 Data-race safety in Swift 5.10
• 💡 The Swift Book: Concurrency
• 💡 An Approachable Guide to Swift Concurrency

AccessLevelOnImport

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AdditiveArithmeticDerivedConformances

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BuiltinMacros

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BuiltinModule

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CodeItemMacros

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DifferentiableProgramming

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FlowSensitiveConcurrencyCaptures

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ForwardModeDifferentiation

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GenerateBindingsForThrowingFunctionsInCXX

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ImplicitSome

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MoveOnlyClasses

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MoveOnlyEnumDeinits

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MoveOnlyTuples

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NamedOpaqueTypes

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NoImplicitCopy

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OldOwnershipOperatorSpellings

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OpaqueTypeErasure

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ParserASTGen

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ParserRoundTrip

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ParserValidation

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ReferenceBindings

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StaticAssert

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TupleConformances

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ImportSymbolicCXXDecls

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OneWayClosureParameters

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ParserDiagnostics

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ModuleInterfaceExportAs

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TypeWitnessSystemInference

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RuntimeDiscoverableAttrs

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Stable

Actors

actors

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AsyncAwait

async/await

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AttachedMacros

Attached macros

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BuiltinAssumeAlignment

Builtin.assumeAlignment

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BuiltinBuildComplexEqualityExecutor

Executor-building for 'complexEquality executor' builtins

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BuiltinBuildExecutor

Executor-building builtins

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BuiltinBuildMainExecutor

MainActor executor building builtin

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BuiltinContinuation

Continuation builtins

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BuiltinCreateAsyncTaskInGroup

MainActor executor building builtin

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BuiltinCreateTaskGroupWithFlags

Builtin.createTaskGroupWithFlags

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BuiltinExecutor

Builtin.Executor type

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BuiltinHopToActor

Builtin.HopToActor

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BuiltinIntLiteralAccessors

Builtin.IntLiteral accessors

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BuiltinJob

Builtin.Job type

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BuiltinStackAlloc

Builtin.stackAlloc

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BuiltinTaskGroupWithArgument

TaskGroup builtins

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BuiltinTaskRunInline

Builtin.taskRunInline

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BuiltinUnprotectedAddressOf

Builtin.unprotectedAddressOf

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BuiltinUnprotectedStackAlloc

Builtin.unprotectedStackAlloc

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ConcurrentFunctions

@concurrent functions

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EffectfulProp

Effectful properties

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ExtensionMacroAttr

@attached(extension)

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ExtensionMacros

Extension macros

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FreestandingMacros

freestanding declaration macros

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GlobalActors

Global actors

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ImplicitSelfCapture

@_implicitSelfCapture attribute

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InheritActorContext

@_inheritActorContext attribute

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Macros

Macros

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MarkerProtocol

@_marker protocol

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MoveOnly

noncopyable types

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NewCxxMethodSafetyHeuristics

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

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NoAsyncAvailability

@available(*, noasync)

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ParameterPacks

Value and type parameter packs

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PrimaryAssociatedTypes2

Primary associated types

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RethrowsProtocol

@rethrows protocol

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Sendable

Sendable and @Sendable

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SpecializeAttributeWithAvailability

@_specialize attribute with availability

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UnavailableFromAsync

@_unavailableFromAsync

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UnsafeInheritExecutor

@_unsafeInheritExecutor

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BuiltinCopy

Builtin.copy()

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"Expression macros"

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