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import scala.collection.mutable.WeakHashMap
import scala.collection.JavaConversions._
class bar { }
class foo {
val map = WeakHashMap[AnyRef, collection.mutable.Map[bar, collection.mutable.Set[bar]]]()
def test={
val tmp:bar=null
if (map.get(tmp).isEmpty) map.put(tmp,collection.mutable.Set())
}
}
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