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Pack type inference fails for <code>T == (repeat each A, U, repeat each B)</code>

compilerThe Swift compiler itselfThe Swift compiler itself

genericsFeature: generic declarations and typesFeature: generic declarations and types

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

swift 6.2

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

unexpected errorBug: Unexpected errorBug: Unexpected error

Status: Open.

Bug

#82403 In swiftlang/swift;

· AnthonyLatsis opened on Jun 22, 2025

(Parameter packs) Crash in SILGenFunction::emitOrigToSubstValue()

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

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

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

Status: Open.

#82260 In swiftlang/swift;

· GeorgeLyon opened on Jun 16, 2025

Variadic generic default argument does not work for single element cases

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

default argumentsFeature: default arguments for value parametersFeature: default arguments for value parameters

genericsFeature: generic declarations and typesFeature: generic declarations and types

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

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

Status: Open.

#81741 In swiftlang/swift;

· hamishknight opened on May 23, 2025

Compiler crash when conforming to protocol with a method using parameter pack with generic type

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

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

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

Status: Open.

#81600 In swiftlang/swift;

· netatmoadmin opened on May 19, 2025

Variadic-generic opaque return types produce malformed module interfaces

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

library evolutionFeature: library evolution (umbrella feature for features that facilitate resilient libraries)Feature: library evolution (umbrella feature for features that facilitate resilient libraries)

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

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

swift 6.1

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

Status: Open.

Bug

#81455 In swiftlang/swift;

· karwa opened on May 12, 2025

Inserting parameter pack into another parameter pack causes 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.

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

Status: Open.

#80937 In swiftlang/swift;

· adam-fowler opened on Apr 20, 2025

Parameter pack compilation crash "This isn't an lvalue" with 6.0.3 OSS toolchain but works with Xcode toolchain

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.

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

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

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

Status: Open.

#79870 In swiftlang/swift;

· marcprux opened on Mar 9, 2025

Opaque types and variadic/pack iteration crashes the compiler

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

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

Status: Open.

#79281 In swiftlang/swift;

· dehesa opened on Feb 10, 2025

Parameter packs cannot return zero or single-element tuples from protocols

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

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

Status: Open.

#79010 In swiftlang/swift;

· JessyCatterwaul opened on Jan 29, 2025

Pack expansion with element archetype crashes compiler

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

pack expansionsFeature → expressions: Pack expansion expressionsFeature → expressions: Pack expansion expressions

pack iterationFeature → statements → for-in: Pack iterationFeature → statements → for-in: Pack iteration

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

swift 6.2

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

Status: Open.

#78934 In swiftlang/swift;

· hamishknight opened on Jan 26, 2025

Parameter packs + generic static member lookup + expressible by literal = 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.

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

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

Status: Open.

#78912 In swiftlang/swift;

· stephencelis opened on Jan 25, 2025

Attempting to escape a pack element from a closure crashes the compiler

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

pack iterationFeature → statements → for-in: Pack iterationFeature → statements → for-in: Pack iteration

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

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

Status: Open.

#78892 In swiftlang/swift;

· hamishknight opened on Jan 24, 2025