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Protocol requirement can be satisfied with an misnamed API inside another extension, causing runtime crash

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

objective-c interopFeature: Interoperability with Objective-CFeature: Interoperability with Objective-C

run-time crashBug → crash: Swift code crashed during executionBug → crash: Swift code crashed during execution

Status: Open.

#85228 In swiftlang/swift;

· an0 opened on Oct 30, 2025

[AutoDiff] Differentiation stopped to work for imported protocol methods

AutoDiff

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

Status: Open.

#84840 In swiftlang/swift;

· asl opened on Oct 11, 2025

Missing conformances to BitwiseCopyable

BitwiseCopyableArea → standard library: The `BitwiseCopyable` protocolArea → standard library: The `BitwiseCopyable` protocol

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

standard libraryArea: Standard library umbrellaArea: Standard library umbrella

Status: Open.

#79470 In swiftlang/swift;

· glessard opened on Feb 18, 2025

Apparent compiler bug relating to Optional witnessing failable initializer requirement

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

initFeature → declarations: InitializersFeature → declarations: Initializers

OptionalArea → standard library: The `Optional` typeArea → standard library: The `Optional` type

SILGenArea → compiler: The SIL generation stageArea → compiler: The SIL generation stage

swift 6.0

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

Status: Open.

#78409 In swiftlang/swift;

· jeremyabannister opened on Jan 2, 2025

Crash when accessing generic property wrapper's <code>some</code> type-using wrappedValue

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

classFeature → type declarations: Class declarationsFeature → type declarations: Class declarations

compilerThe Swift compiler itselfThe Swift compiler itself

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

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

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

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

swift 6.0

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

Status: Open.

#78405 In swiftlang/swift;

· lukaskollmer opened on Jan 2, 2025

[AutoDiff] Crash when protocol conditional conformance to Differentiable is missed

accepts invalidBug: Accepts invalidBug: Accepts invalid

AutoDiff

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

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

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

Status: Open.

#78370 In swiftlang/swift;

· kovdan01 opened on Dec 27, 2024

Bad diagnostic about memberwise <code>init</code> not being public

access controlFeature → modifiers: Access control and access levelsFeature → modifiers: Access control and access levels

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

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

fix-itsFeature: diagnostic fix-itsFeature: diagnostic fix-its

good first issueGood for newcomersGood for newcomers

memberwise initFeature: Memberwise structure initializersFeature: Memberwise structure initializers

swift 6.2

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

Status: Open.

Bug

#78362 In swiftlang/swift;

· AnthonyLatsis opened on Dec 24, 2024

Conforming an actor type with a synchronous initializer to an async init protocol requirement crashes the compiler

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

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

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

IRGenLLVM IR generationLLVM IR generation

Status: Open.

#76529 In swiftlang/swift;

· fwcd opened on Sep 17, 2024

Invalid type parameter in getReducedType()

attributesFeature: Declaration and type attributesFeature: Declaration and type attributes

AutoDiff

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

conditional conformancesFeature → protocol → conformances: conditional conformancesFeature → protocol → conformances: conditional conformances

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

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

SILGenArea → compiler: The SIL generation stageArea → compiler: The SIL generation stage

swift 6.0

Status: Open.

#75711 In swiftlang/swift;

· JaapWijnen opened on Aug 6, 2024

6.0 conformance regression with abstract type witness

associatedtypeFeature → declarations → protocol: `associatedtype` declarationsFeature → declarations → protocol: `associatedtype` declarations

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

extensionFeature → declarations: `extension` declarationsFeature → declarations: `extension` declarations

regression

swift 6.0

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

unexpected errorBug: Unexpected errorBug: Unexpected error

Status: Open.

#75504 In swiftlang/swift;

· AnthonyLatsis opened on Jul 26, 2024

[Source compatibility suite] Doggie failing to build with main branch on linux

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

regression

source compatibility suiteFlag: An issue that surfaced in the source compatibility suiteFlag: An issue that surfaced in the source compatibility suite

swift 6.0

unexpected errorBug: Unexpected errorBug: Unexpected error

Status: Open.

#71311 In swiftlang/swift;

· justice-adams-apple opened on Feb 1, 2024

[AutoDiff] Assertion failure: (!isInvalid()) in function getRequirement.

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

AutoDiff

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

conformancesFeature → protocol: protocol conformancesFeature → protocol: protocol conformances

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

expressionsFeature: expressionsFeature: expressions

genericsFeature: generic declarations and typesFeature: generic declarations and types

IRGenLLVM IR generationLLVM IR generation

multiple filesFlag: An issue whose reproduction requires multiple filesFlag: An issue whose reproduction requires multiple files

optimized onlyFlag: An issue whose reproduction requires optimized compilationFlag: An issue whose reproduction requires optimized compilation

swift 6.0

Status: Open.

#70834 In swiftlang/swift;

· fibrechannelscsi opened on Jan 11, 2024