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Embedded KeyPath Optimization Limited to Types Internal to the Module

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

embeddedEmbedded SwiftEmbedded Swift

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

Status: Open.

#81588 In swiftlang/swift;

· filip-sakel opened on May 17, 2025

Compiler Regression in Swift 6/Xcode 16b6

@dynamicMemberLookupFeature → attributes: the @dynamicMemberLookup attributeFeature → attributes: the @dynamicMemberLookup attribute

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

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

expressionsFeature: expressionsFeature: expressions

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

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

Status: Open.

#76120 In swiftlang/swift;

· rhysm94 opened on Aug 28, 2024

Appending a writable/sendable key path loses writability

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

standard libraryArea: Standard library umbrellaArea: Standard library umbrella

Status: Open.

#75531 In swiftlang/swift;

· stephencelis opened on Jul 28, 2024

Key path + variadic generics crash

assertion failureBug → crash: An assertion failureBug → crash: An assertion failure

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

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

genericsFeature: generic declarations and typesFeature: generic declarations and types

IRGenLLVM IR generationLLVM IR generation

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

parameter packsFeature → generics: Parameter packsFeature → generics: Parameter packs

swift 6.0

Status: Open.

#73690 In swiftlang/swift;

· vanvoorden opened on May 17, 2024

Key path formed to setter with unavailable key path is writable

availabilityThe @available attribute and availability checking in generalThe @available attribute and availability checking in general

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

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

Status: Open.

#72809 In swiftlang/swift;

· stephencelis opened on Apr 3, 2024

Crash during optional key path access

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

standard libraryArea: Standard library umbrellaArea: Standard library umbrella

Status: Open.

#70611 In swiftlang/swift;

· stephencelis opened on Dec 22, 2023

Using a non-keypath as a keypath leads to 'unable to infer closure type without a type annotation"

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

closuresFeature: closuresFeature: closures

diagnostics QoIBug: Diagnostics Quality of ImplementationBug: Diagnostics Quality of Implementation

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

swift 5.9

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

type inferenceFeature: type inferenceFeature: type inference

Status: Open.

#69795 In swiftlang/swift;

· stackotter opened on Nov 11, 2023

Constraint solver assertion failure with key paths and dynamic member subscript

@dynamicMemberLookupFeature → attributes: the @dynamicMemberLookup attributeFeature → attributes: the @dynamicMemberLookup attribute

assertion failureBug → crash: An assertion failureBug → crash: An assertion failure

attributesFeature: Declaration and type attributesFeature: Declaration and type attributes

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

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

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

swift 5.9

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

WindowsPlatform: WindowsPlatform: Windows

Status: Open.

#69386 In swiftlang/swift;

· stephencelis opened on Oct 24, 2023

Improve debug description of key paths with generic subscripts

@dynamicMemberLookupFeature → attributes: the @dynamicMemberLookup attributeFeature → attributes: the @dynamicMemberLookup attribute

AnyKeyPathArea → standard library: The `AnyKeyPath` typeArea → standard library: The `AnyKeyPath` type

attributesFeature: Declaration and type attributesFeature: Declaration and type attributes

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

CustomDebugStringConvertibleArea → standard library: The `CustomDebugStringConvertible` protocolArea → standard library: The `CustomDebugStringConvertible` protocol

declarationsFeature: declarationsFeature: declarations

demanglingArea → compiler: The `libswiftDemangling` libraryArea → compiler: The `libswiftDemangling` library

genericsFeature: generic declarations and typesFeature: generic declarations and types

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

standard libraryArea: Standard library umbrellaArea: Standard library umbrella

subscriptFeature: Subscript declarationsFeature: Subscript declarations

swift 5.9

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

Status: Open.

#65996 In swiftlang/swift;

· mbrandonw opened on May 18, 2023

Failed to produce diagnostic when unable to choose correct initializer inside of result builder

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

closuresFeature: closuresFeature: closures

compilerThe Swift compiler itselfThe Swift compiler itself

declarationsFeature: declarationsFeature: declarations

diagnostics QoIBug: Diagnostics Quality of ImplementationBug: Diagnostics Quality of Implementation

expressionsFeature: expressionsFeature: expressions

failed to produce diagnosticBug → internal error: Failed to produce diagnostic for expressionBug → internal error: Failed to produce diagnostic for expression

funcFeature → declarations: FunctionsFeature → declarations: Functions

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

overloadingFeature: Overloading symbol namesFeature: Overloading symbol names

result buildersFeature: Result buildersFeature: Result builders

swift 5.9

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

Status: Open.

#65467 In swiftlang/swift;

· j-f1 opened on Apr 27, 2023

Key paths with opaque types cannot be directly initialized.

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

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

opaque typesFeature → types: opaque typesFeature → types: opaque types

swift 5.9

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

type inferenceFeature: type inferenceFeature: type inference

unexpected errorBug: Unexpected errorBug: Unexpected error

Status: Open.

#64341 In swiftlang/swift;

· JessyCatterwaul opened on Mar 14, 2023

Failed to produce diagnostic for expression (TableColumn with erroneous key path)

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

failed to produce diagnosticBug → internal error: Failed to produce diagnostic for expressionBug → internal error: Failed to produce diagnostic for expression

key pathsFeature: key paths (both native and Objective-C)Feature: key paths (both native and Objective-C)

result buildersFeature: Result buildersFeature: Result builders

swift 5.9

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

Status: Open.

#63481 In swiftlang/swift;

· JetForMe opened on Feb 7, 2023