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Nighty Windows toolchain is not usable

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

regression

toolchain

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

WindowsPlatform: WindowsPlatform: Windows

Status: Open.

#85252 In swiftlang/swift;

· bkhouri opened on Oct 31, 2025

typechecker regression when calling protocol requirement through an existential of a refining 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.

compilerThe Swift compiler itselfThe Swift compiler itself

constrained existentialsFeature → existentials: constrained existentials such as 'any Collection<Int>'Feature → existentials: constrained existentials such as 'any Collection<Int>'

existential member accessesFeature → existentials: existential member accessesFeature → existentials: existential member accesses

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

genericsFeature: generic declarations and typesFeature: generic declarations and types

regression

swift 6.1

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

unexpected errorBug: Unexpected errorBug: Unexpected error

Status: Open.

#81712 In swiftlang/swift;

· tayloraswift opened on May 22, 2025

@_silgen_name is not any more exposing any function

@_silgen_nameFeature → attributes: The @_silgen_name attributeFeature → attributes: The @_silgen_name attribute

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

regression

swift 6.0

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

Status: Open.

#76850 In swiftlang/swift;

· AhmadMhmoud opened on Oct 3, 2024

[asserts] Compiler crashing on computed property accessing a stored property with same label as static func

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

call expressionsFeature → expressions: Call expressionsFeature → expressions: Call expressions

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

overloadingFeature: Overloading symbol namesFeature: Overloading symbol names

regression

swift 5.10

swift 6.0

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

Status: Open.

#75623 In swiftlang/swift;

· AdamCmiel opened on Aug 1, 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

Only during archive builds, the error <code>Command SwiftCompile failed with a nonzero exit code</code> occurs.

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

missing infoResolution: Is missing crucial info such as a test case or a concise descriptionResolution: Is missing crucial info such as a test case or a concise description

regression

swift 5.10

Status: Open.

#75049 In swiftlang/swift;

· ukit-tokyo opened on Jul 8, 2024

This complicated combination of trailing closures and autoclosures crashes the Swift compiler

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.

call expressionsFeature → expressions: Call expressionsFeature → expressions: Call expressions

closuresFeature: closuresFeature: closures

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

regression

swift 6.0

trailing closuresFeature: trailing closuresFeature: trailing closures

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

Status: Open.

#74645 In swiftlang/swift;

· schuelermine opened on Jun 22, 2024

TypeCheckProtocol.cpp crashed with "witness has more effects than 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.

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

regression

swift 6.0

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

Status: Open.

#73479 In swiftlang/swift;

· kateinoigakukun opened on May 7, 2024

SIL Assertion failed: (SGF.ExpectedExecutor || SGF.unsafelyInheritsExecutor())

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

regression

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

swift 6.0

Status: Open.

#73389 In swiftlang/swift;

· vsarunas opened on May 2, 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

SILGenExpr crash when using parameter pack

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.

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

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

declarationsFeature: declarationsFeature: declarations

expressionsFeature: expressionsFeature: expressions

genericsFeature: generic declarations and typesFeature: generic declarations and types

let & varFeature: constant and variable declarationsFeature: constant and variable declarations

member expressionsFeature → expressions: Member expressionsFeature → expressions: Member expressions

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

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

regression

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

swift 6.0

Status: Open.

#69945 In swiftlang/swift;

· theblixguy opened on Nov 17, 2023

Compiler crashes when some closure parameters have equal names and different types

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.

capture listsFeature → closures: Closure capture listsFeature → closures: Closure capture lists

closuresFeature: closuresFeature: closures

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

IRGenLLVM IR generationLLVM IR generation

regression

swift 5.9

Status: Open.

#66359 In swiftlang/swift;

· AlekseiYasiuchenia opened on Jun 6, 2023