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Trying to compile code containing too-short backtick-escaped identifiers crashes

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.

#86354 In swiftlang/swift;

· ai0a opened on Jan 7, 2026

SILGen crash in emitPackExpansionIntoPack when calling cross-module function with pack expansion argument

Status: Open.

#86348 In swiftlang/swift;

· coenttb opened on Jan 7, 2026

IRGen crash: async function with typed throws and nested error type under generic

Status: Open.

#86347 In swiftlang/swift;

· coenttb opened on Jan 7, 2026

Foundation/NSCoder.swift:743: Fatal error: There was a decoding error and the decoding failure policy is .raiseException.

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.

#86344 In swiftlang/swift;

· YuanchengJiang opened on Jan 7, 2026

6.3 crashes when producing binary on Windows x86_64

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

clang importerArea → compiler: The clang importerArea → compiler: The clang importer

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

swift 6.3

WindowsPlatform: WindowsPlatform: Windows

Status: Open.

#86342 In swiftlang/swift;

· Joannis opened on Jan 7, 2026

C++ Interop should not require "type alias"es for <code>std::span</code> &lt;-&gt; <code>Span</code> conversions

featureA feature request or implementationA feature request or implementation

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

Status: Open.

#86339 In swiftlang/swift;

· MahdiBM opened on Jan 7, 2026

"Approachable concurrency" miscompilation involving function conversions

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.

#86332 In swiftlang/swift;

· jamieQ opened on Jan 6, 2026

Failed to produce diagnostic for expression;

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

diagnostics QoIBug: Diagnostics Quality of ImplementationBug: Diagnostics Quality of Implementation

failed to produce diagnosticBug → internal error: Failed to produce diagnostic for expressionBug → internal error: Failed to produce diagnostic for expression

SwiftUIFlag: Involves SwiftUIFlag: Involves SwiftUI

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

Status: Open.

#86330 In swiftlang/swift;

· Thecodeisrereall opened on Jan 6, 2026

Linux: C++ Interop doesn't work with explicit module builds

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++

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

Status: Open.

#86328 In swiftlang/swift;

· etcwilde opened on Jan 6, 2026

Compiler crash (signal 5) in MandatoryPerformanceOptimizations with typed throws on protocol conformances in Embedded Swift

Status: Open.

#86318 In swiftlang/swift;

· coenttb opened on Jan 6, 2026

Assertion failed: Index &lt; Length &amp;&amp; "Invalid index!"

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.

#86315 In swiftlang/swift;

· rayx opened on Jan 6, 2026

Incorrect isolation domain in diagnostic

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.

#86314 In swiftlang/swift;

· rayx opened on Jan 6, 2026