Pattern Matching of Sealed Classes
Sealed ClassesIf the selector of a pattern match is an instance of a sealed class, the compilation of pattern matching can emit warnings which diagnose that a given set of patterns is not exhaustive, i.e. that there is a possibility of a MatchError being raised at run-time.
When applied to the selector of a match expression, the @unchecked annotation suppresses any warnings about non-exhaustive pattern matches which would otherwise be emitted. For instance, no warnings would be produced for the method definition below.
def f(x: Option[Int]) = (x: @unchecked) match {
case Some(y) => y
}Read more: A Tour of Scala: Sealed Classes
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