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Build failure on Swift 6.3 + Debian/Ubuntu due to ICU version conflict

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

Status: Open.

Bug

#88485 In swiftlang/swift;

· jbelkins opened on Apr 15, 2026

Function with a parameter pack returning a (repeat each T) tuple and a void overload does not work with reference types

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

Status: Open.

Bug

#88484 In swiftlang/swift;

· SilverEzhik opened on Apr 15, 2026

Existential unboxing only works when passing it as an argument to a function, not when invoking a member function on it

existentialsFeature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased valuesFeature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values

implicit existential openingFeature → existentials: implicit opening of existentials when passed to parameters of generic typeFeature → existentials: implicit opening of existentials when passed to parameters of generic type

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

Status: Open.

#88476 In swiftlang/swift;

· ahoppen opened on Apr 15, 2026

Assertion failed: Verify() && "verification failed", file C:\Users\swift-ci\jenkins\workspace\swift-6.3-windows-toolchain-arm64\llvm-project\lldb\source\Symbol\CompilerType.cpp, line 1257

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

REPL

WindowsPlatform: WindowsPlatform: Windows

Status: Open.

Bug

#88475 In swiftlang/swift;

· compnerd opened on Apr 15, 2026

Macro arguments within types cannot see macro-expanded decls at top-level

compilerThe Swift compiler itselfThe Swift compiler itself

macro expansionsFeature → expressions: Macro expansion expressionsFeature → expressions: Macro expansion expressions

name lookupArea → compiler → type checker: Name lookupArea → compiler → type checker: Name lookup

swift macroFeature → declarations: Swift `macro` declarationsFeature → declarations: Swift `macro` declarations

Status: Open.

#88473 In swiftlang/swift;

· hamishknight opened on Apr 14, 2026

Declaration macro with closure crashes in top-level code

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

macro expansionsFeature → expressions: Macro expansion expressionsFeature → expressions: Macro expansion expressions

swift macroFeature → declarations: Swift `macro` declarationsFeature → declarations: Swift `macro` declarations

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

Status: Open.

#88472 In swiftlang/swift;

· hamishknight opened on Apr 14, 2026

Bad diagnostic for switching on nested, uninhabited enums

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

Status: Open.

Bug

#88463 In swiftlang/swift;

· stephencelis opened on Apr 14, 2026

Circular reference when property wrapper default value references CodingKeys in Codable struct

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

Status: Open.

Bug

#88459 In swiftlang/swift;

· alhafram opened on Apr 14, 2026

Closure parameter modifying global state is marked as sending despite capturing non-disconnected state, causing low-level data race

compilerThe Swift compiler itselfThe Swift compiler itself

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

sendingFeature → concurrency: The "sending" parameter and result modifierFeature → concurrency: The "sending" parameter and result modifier

Status: Open.

#88457 In swiftlang/swift;

· ahoppen opened on Apr 14, 2026

[Swift] Assertion "Expected non-null node" in ConstraintSystem::getType when type-checking a @Sendable closure calling an overloaded @preconcurrency @MainActor function shadowed by a global var binding

@preconcurrencyFeature → attributes: The "preconcurrency" attributeFeature → attributes: The "preconcurrency" attribute

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

SendableArea → standard library: The Sendable protocolArea → standard library: The Sendable protocol

Status: Open.

Bug

#88456 In swiftlang/swift;

· YuanchengJiang opened on Apr 14, 2026

[Swift][SILGen] Assertion "Illegal convention for non-address types" in getFunctionArgOwnership when compiling a function parameter with a @propertyWrapper that has a projectedValue

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

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

Status: Open.

Bug

#88455 In swiftlang/swift;

· YuanchengJiang opened on Apr 14, 2026

[Swift] Assertion "Expected type to have been set!" in ConstraintSystem::getType when type-checking a call through a function-value binding that shadows an overloaded @preconcurrency @MainActor function

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

expressionsFeature: expressionsFeature: expressions

swift 6.3

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

Status: Open.

Bug

#88454 In swiftlang/swift;

· YuanchengJiang opened on Apr 14, 2026