@switch annotatition
An annotation to be applied to a match expression. If present, the compiler will verify that the match has been compiled to a tableswitch or lookupswitch and issue an error if it instead compiles into a series of conditional expressions.Example usage:
val Constant = 'Q'
def tokenMe(ch: Char) = (ch: @switch) match {
case ' ' | '\t' | '\n' => 1
case 'A' | 'Z' | '$' => 2
case '5' | Constant => 3 // a non-literal may prevent switch generation: this would not compile
case _ => 4
}
Scala Documetation
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