Scala Library: scala.Nothing
scala.Nothing
abstract final class Nothing extends AnyNothing is - together with scala.Null - at the bottom of Scala’s type
hierarchy.
Nothing is a subtype of every other type (including scala.Null); there exist
no instances of this type. Although type Nothing is uninhabited, it is
nevertheless useful in several ways. For instance, the Scala library defines a
value scala.collection.immutable.Nil of type List[Nothing] . Because lists are
covariant in Scala, this makes scala.collection.immutable.Nil an instance of
List[T] , for any element of type T .
Another usage for Nothing is the return type for methods which never return normally. One example is method error in scala.sys, which always throws an exception.
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