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Miscompile of Never-returning function passed to variadic <code>Any</code> parameter with <code>-O</code>

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

miscompileBug: Compiler produces incorrect codegenBug: Compiler produces incorrect codegen

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

SILOptimizerArea → compiler: SIL optimization passesArea → compiler: SIL optimization passes

Status: Open.

#85851 In swiftlang/swift;

· hamishknight opened on Dec 5, 2025

ResultBuilders do not produce efficient parameter pack types

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

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

Status: Open.

#85837 In swiftlang/swift;

· ultramiraculous opened on Dec 4, 2025

<code>inout</code> instance members of non-Escapable structs

ownershipFeature: Ownership modifiers and semanticsFeature: Ownership modifiers and semantics

Status: Open.

#85832 In swiftlang/swift;

· ahoppen opened on Dec 4, 2025

Compiler crash on a rather simple extension of AsyncSequence

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

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

Status: Open.

#85821 In swiftlang/swift;

· Ky-MLB opened on Dec 3, 2025

[C++ interop] swiftc not compatible with latest libc++ headers

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++

Status: Open.

#85820 In swiftlang/swift;

· junov-google opened on Dec 3, 2025

A fixit should be offered for the "no 'async' operations occur within 'await' expression" warning

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

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

Status: Open.

#85818 In swiftlang/swift;

· jamieQ opened on Dec 3, 2025

<code>NonisolatedNonsendingByDefault:migrate</code> flags <code>isolated(any)</code> functions

actor isolationFeature → concurrency: Actor isolationFeature → concurrency: Actor isolation

compilerThe Swift compiler itselfThe Swift compiler itself

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

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

unexpected warningBug: Unexpected warningBug: Unexpected warning

Status: Open.

Bug

#85817 In swiftlang/swift;

· mattmassicotte opened on Dec 3, 2025

DwarfReader in vendored code for swift-profile-recorder crashes with Dwarf v2 ELF 32-bit binary

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

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

Status: Open.

#85792 In swiftlang/swift;

· jessezamora opened on Dec 2, 2025

allow <code>@_unavailableFromAsync</code> on computed properties

featureA feature request or implementationA feature request or implementation

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

Status: Open.

#85789 In swiftlang/swift;

· lukaskollmer opened on Dec 2, 2025

Assertion failed: (ownership == ValueOwnership::Shared), function getVariableAddressableBuffer, file SILGenDecl.cpp, line 2352

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

ownershipFeature: Ownership modifiers and semanticsFeature: Ownership modifiers and semantics

Status: Open.

#85785 In swiftlang/swift;

· ahoppen opened on Dec 2, 2025

Cannot suppress Escapable requirement on associated types

ownershipFeature: Ownership modifiers and semanticsFeature: Ownership modifiers and semantics

Status: Open.

#85773 In swiftlang/swift;

· ahoppen opened on Dec 1, 2025

Cannot borrow closure in non-escapable type

ownershipFeature: Ownership modifiers and semanticsFeature: Ownership modifiers and semantics

Status: Open.

#85772 In swiftlang/swift;

· ahoppen opened on Dec 1, 2025