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[6.3] "Failed to produce diagnostic for expression" regression

compilerThe Swift compiler itselfThe Swift compiler itself

diagnostics qualityBug: The quality of compiler diagnosticsBug: The quality of compiler diagnostics

expressionsFeature: expressionsFeature: expressions

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

Status: Open.

Bug

#88540 In swiftlang/swift;

· vanvoorden opened on Apr 17, 2026

IRGen SIGSEGV with Single-Field C++ Structs in Release Mode

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.

Bug

#88539 In swiftlang/swift;

· juraskrlec opened on Apr 17, 2026

swift-inspect build error: "no such module 'SwiftRemoteMirror'"

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

Status: Open.

Bug

#88535 In swiftlang/swift;

· snej opened on Apr 17, 2026

Failed to produce diagnostic when bare View is mixed with ToolbarItem inside .toolbar { }

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

diagnostics qualityBug: The quality of compiler diagnosticsBug: The quality of compiler diagnostics

expressionsFeature: expressionsFeature: expressions

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

Status: Open.

#88533 In swiftlang/swift;

· schatt opened on Apr 17, 2026

Failed to produce diagnostic for expression; please submit a bug report

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

Status: Open.

Bug

#88532 In swiftlang/swift;

· ayyoub512 opened on Apr 17, 2026

Sema: "Cannot type-check PatternBindingDecl without closure context" — IUO binding with unbound generic type inside a closure

Status: Open.

#88530 In swiftlang/swift;

· azarovalex opened on Apr 17, 2026

SIL verification failed: EnumInst operand type does not match type of case

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.

Bug

#88514 In swiftlang/swift;

· cacoliverpool opened on Apr 16, 2026

Synchronous functions allow non-Sendable values to be sent from an isolated context to a nonisolated one

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

Status: Open.

Bug

#88506 In swiftlang/swift;

· FiggChristian opened on Apr 16, 2026

Incorrect warning about isolation with a pretty epic combination of conditions

@preconcurrencyFeature → attributes: The "preconcurrency" attributeFeature → attributes: The "preconcurrency" attribute

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

Status: Open.

Bug

#88498 In swiftlang/swift;

· mattmassicotte opened on Apr 16, 2026

Compiler fails to produce diagnostic for if case .X(.Y) = Z

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

Status: Open.

Bug

#88496 In swiftlang/swift;

· hharck opened on Apr 16, 2026

Build failure on Swift 6.3 + Debian/Ubuntu due to ICU version conflict

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

Status: Open.

Bug

#88485 In swiftlang/swift;

· jbelkins opened on Apr 15, 2026

Function with a parameter pack returning a (repeat each T) tuple and a void overload does not work with reference types

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

Status: Open.

Bug

#88484 In swiftlang/swift;

· SilverEzhik opened on Apr 15, 2026