Fatal
A critical issue that might affect the integrity of the entire output beyond just the node where it occurred. An example is a configuration header with parsing errors in a markup document that might affect other markup content that would then unexpectedly fall back to defaults.
trait Singleton
trait Product
trait Mirror
trait Serializable
class MessageLevel
trait Product
trait Equals
trait Ordered[MessageLevel]
trait Comparable[MessageLevel]
class Object
trait Matchable
class Any
Fatal.type