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trait Option {}
case class Choice(a: Option, b: Option) extends Option;
case class Some(x: java.lang.String) extends Option;
case object None extends Option;
object test {
def f(opt: Option) = opt match {
case Choice(Some("one"), Some(x)) => 1;
case Choice(Some("two"), None) => 1;
case Choice(y, Some("two")) => 2;
case Choice(Some(z), a) => 3;
case Some(b) => 4;
case None => 5;
}
}
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