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Assertion failed: isa<To>(Val) && "cast<Ty>() argument of incompatible type!", file D:\r\_work\swift-build\swift-build\SourceCache\llvm-project\llvm\include\llvm/Support/Casting.h, line 578

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

IRGenLLVM IR generationLLVM IR generation

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

Status: Open.

#83017 In swiftlang/swift;

· compnerd opened on Jul 12, 2025

Why does the branch coverage of all files show as 0% when using llvm-cov to analyze Swift files?

code coverageArea → source tooling: code coverageArea → source tooling: code coverage

compilerThe Swift compiler itselfThe Swift compiler itself

featureA feature request or implementationA feature request or implementation

IRGenLLVM IR generationLLVM IR generation

swift 6.2

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

Status: Open.

#81730 In swiftlang/swift;

· ZhengXiuQun opened on May 23, 2025

Assertion failed: (hasValidSignatureForEmbedded(f)), function addLazyFunction at GenDecl.cpp:1494.

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

IRGenLLVM IR generationLLVM IR generation

Status: Open.

#80947 In swiftlang/swift;

· Vithanco opened on Apr 21, 2025

Compiler crash (regression) relating to typed throws and primary associated types

async & awaitFeature → concurrency: asynchronous function aka the async/await patternFeature → concurrency: asynchronous function aka the async/await pattern

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

error handling

IRGenLLVM IR generationLLVM IR generation

swift 6.1

throws & rethrowsFeature → error handling: throws & rethrowsFeature → error handling: throws & rethrows

typed throwsFeature → error handling → throws & rethrows: Typed throwsFeature → error handling → throws & rethrows: Typed throws

Status: Open.

Bug

#80732 In swiftlang/swift;

· lawrence-forooghian opened on Apr 10, 2025

<code>BitwiseCopyable</code> attribute on C struct leads to compiler crash

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.

c interopFeature: Interoperability with CFeature: Interoperability with C

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

IRGenLLVM IR generationLLVM IR generation

swift 6.0

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

Status: Open.

#78368 In swiftlang/swift;

· amomchilov opened on Dec 27, 2024

Crash in HandleInlinedLandingPad

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

CodeGen

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

IRGenLLVM IR generationLLVM IR generation

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

Status: Open.

#78312 In swiftlang/swift;

· wtholliday opened on Dec 20, 2024

Building Ladybird with Swift crashes the frontend

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

c++ interopFeature: Interoperability with C++Feature: Interoperability with C++

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.

#77042 In swiftlang/swift;

· ChaseKnowlden opened on Oct 16, 2024

[6.0.1] Compiler crashes when attempting to compile Swift Foundation. Failed to reconstruct 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

Darwin

IRGenLLVM IR generationLLVM IR generation

Status: Open.

#76788 In swiftlang/swift;

· sbhat98 opened on Sep 30, 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

Assertion failure while emitting a partial apply forwarder on arm64e

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

IRGenLLVM IR generationLLVM IR generation

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

Status: Open.

#75742 In swiftlang/swift;

· asl opened on Aug 7, 2024

5.10 "LoadableByAddress" non-deterministic compiler crash when parameter pack closure saved to instance property.

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

function typesFeature → types: function typesFeature → types: function types

genericsFeature: generic declarations and typesFeature: generic declarations and types

good first issueGood for newcomersGood for newcomers

IRGenLLVM IR generationLLVM IR generation

needs testsFlag: Issue is fixed but needs tests / PR needs testsFlag: Issue is fixed but needs tests / PR needs tests

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

propertiesFeature: propertiesFeature: properties

swift 5.10

typesFeature: typesFeature: types

Status: Open.

#74609 In swiftlang/swift;

· vanvoorden opened on Jun 21, 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