Unknown region isolation pattern (RegionIsolationUnknownPattern)
Overview
This diagnostic indicates that the region-based isolation checker has detected an isolation error but the compiler does not currently know how to emit a descriptive diagnostic for the detected pattern. This is a compiler bug. If you encounter this diagnostic, please file a bug report at https://github.com/swiftlang/swift/issues with a minimal example that reproduces the issue.
See Also
@dynamicCallable implementation requirements (DynamicCallable)Add @preconcurrency import (AddPreconcurrencyImport)Always enabled availability domains (AlwaysAvailableDomain)Argument matching for trailing closures (TrailingClosureMatching)Calling a mutating async actor-isolated method (ActorIsolatedMutatingAsync)Calling an actor-isolated method from a synchronous nonisolated context (ActorIsolatedCall)Captures in a `@Sendable` closure (SendableClosureCaptures)Compilation caching (CompilationCaching)Conforming to `StringInterpolationProtocol` (StringInterpolationConformance)Conversion from `@isolated(any)` function type to synchronous function type (ConversionFromIsolatedAnyToSynchronous)Cross-isolation data race (RegionIsolationCrossIsolationDataRace)Deprecated declaration warnings (DeprecatedDeclaration)Deprecated implementation-only imports (ImplementationOnlyDeprecated)Dynamic exclusivity (DynamicExclusivity)Embedded Swift language restrictions (EmbeddedRestrictions)