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import scala.language.experimental.macros
import scala.reflect.macros.blackbox.Context
object Macros {
def defaultZeroCase(pf: PartialFunction[Int, Int]): PartialFunction[Int, Int] = macro impl
def impl(c: Context)(pf: c.Tree) = { import c.universe._
val q"{ case ..$cases }" = pf
q"{ case ..$cases case _ => 0 }"
}
}
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