otherwise method
Implementation
void otherwise(
void Function(ContinuationWithDataMessageHandlerBuilder<M, D, AsyncError>) buildErrorHandler, {
String? label,
}) {
var errorBuilder = ContinuationWithDataMessageHandlerBuilder<M, D, AsyncError>(_forState);
buildErrorHandler(errorBuilder);
_failureContinuationRef.value = errorBuilder._continuationHandler;
}