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case class HasSingleField(f: HasSingleField)
object Test {
def main(args: Array[String]) = {
val s: Object = HasSingleField(null)
s match {
case Matcher(self) =>
assert(self ne null)
}
}
}
object Matcher {
def unapply(x: Object): Option[HasSingleField] = {
if (x.isInstanceOf[HasSingleField])
Some(x.asInstanceOf[HasSingleField])
else
None
}
}
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