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import scala.collection.mutable._
trait SB[A] extends Buffer[A] {
import collection.Traversable
abstract override def insertAll(n: Int, iter: Traversable[A]): Unit = synchronized {
super.insertAll(n, iter)
}
abstract override def update(n: Int, newelem: A): Unit = synchronized {
super.update(n, newelem)
}
}
object Test extends dotty.runtime.LegacyApp {
new ArrayBuffer[Int] with SB[Int]
}
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