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Local function forward reference of <code>lazy</code> var crashes in SILGen

assertion failureBug → crash: An assertion failure Bug → 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 itself The Swift compiler itself

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

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

value capturingFeature: Value capturing by closures and local functions Feature: Value capturing by closures and local functions

Status: Open.

#85266 In swiftlang/swift;

· hamishknight opened on Nov 1, 2025

Crash in <code>getRelativeTermForType</code> for <code>where</code> clause with equality between pack expansion and parent generic param

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

compilerThe Swift compiler itself The Swift compiler itself

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

genericsFeature: generic declarations and types Feature: generic declarations and types

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

swift 6.3

type checkerArea → compiler: Semantic analysis Area → compiler: Semantic analysis

Status: Open.

Bug

#84490 In swiftlang/swift;

· hamishknight opened on Sep 24, 2025

Crash lowering AST to SIL when calling WinSDK function <code>IsEqualGUID()</code>

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

ASTArea → compiler: The libSwiftAST library Area → compiler: The libSwiftAST library

SIL

WindowsPlatform: Windows Platform: Windows

Status: Open.

Bug

#83452 In swiftlang/swift;

· grynspan opened on Jul 31, 2025

Collection bridging coercion miscompiles in noasserts

assertion failureBug → crash: An assertion failure Bug → 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 itself The Swift compiler itself

miscompileBug: Compiler produces incorrect codegen Bug: Compiler produces incorrect codegen

type checkerArea → compiler: Semantic analysis Area → compiler: Semantic analysis

Status: Open.

#83201 In swiftlang/swift;

· hamishknight opened on Jul 21, 2025

Completion crash in inheritance clause

assertion failureBug → crash: An assertion failure Bug → 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.

code completionArea → source tooling: code completion Area → source tooling: code completion

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

Status: Open.

#82208 In swiftlang/swift;

· hamishknight opened on Jun 12, 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 failure Bug → 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 software Bug: A crash, i.e., an abnormal termination of software

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

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

Status: Open.

#79870 In swiftlang/swift;

· marcprux opened on Mar 9, 2025

5.10 compiler emits syntax error on code in #if(compiler&gt;=6.0) block under specific conditions

assertion failureBug → crash: An assertion failure Bug → 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.

parserArea → compiler: The legacy C++ parser Area → compiler: The legacy C++ parser

† libswiftSyntaxArchive • Area → compiler: the once-integrated C++ Syntax library succeeded by SwiftSyntax Archive • Area → compiler: the once-integrated C++ Syntax library succeeded by SwiftSyntax

Status: Open.

#79285 In swiftlang/swift;

· gwynne opened on Feb 10, 2025

SIL Value Ownership Error causes a compiler crash when building in Release mode for 6.0-series toolchains.

assertion failureBug → crash: An assertion failure Bug → 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 itself The Swift compiler itself

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

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

SIL

SIL ownershipArea → compiler → SIL: SIL ownership Area → compiler → SIL: SIL ownership

swift 6.0

verifier

Status: Open.

#78923 In swiftlang/swift;

· fibrechannelscsi opened on Jan 26, 2025

Compiler crash with lifetime issue with latest January trunk snapshots

assertion failureBug → crash: An assertion failure Bug → 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 software Bug: A crash, i.e., an abnormal termination of software

SIL

SIL ownershipArea → compiler → SIL: SIL ownership Area → compiler → SIL: SIL ownership

swift 5.10

Status: Open.

#78444 In swiftlang/swift;

· marcprux opened on Jan 6, 2025

Compiler crash attempting to call a function with a pack archetype expansion parameter

assertion failureBug → crash: An assertion failure Bug → 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 itself The Swift compiler itself

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

expressionsFeature: expressions Feature: expressions

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

genericsFeature: generic declarations and types Feature: generic declarations and types

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

swift 6.1

type checkerArea → compiler: Semantic analysis Area → compiler: Semantic analysis

typesFeature: types Feature: types

Status: Open.

#78396 In swiftlang/swift;

· hamishknight opened on Dec 31, 2024

swift-frontend bundled with Xcode 15.4 fails "Unhandled adjustment" assertion on GitHub Actions

assertion failureBug → crash: An assertion failure Bug → 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 software Bug: A crash, i.e., an abnormal termination of software

type checkerArea → compiler: Semantic analysis Area → compiler: Semantic analysis

Status: Open.

#75830 In swiftlang/swift;

· jaanus opened on Aug 12, 2024

An associatedtype for a constrained derived protocol's associatedtype crashes the compiler.

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

associatedtypeFeature → declarations → protocol: `associatedtype` declarations Feature → 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 itself The Swift compiler itself

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

genericsFeature: generic declarations and types Feature: generic declarations and types

protocolFeature → type declarations: Protocol declarations Feature → type declarations: Protocol declarations

swift 6.0

type checkerArea → compiler: Semantic analysis Area → compiler: Semantic analysis

Status: Open.

#75591 In swiftlang/swift;

· JessyCatterwaul opened on Jul 31, 2024