File: t5580a.scala

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import scala.collection.mutable.WeakHashMap

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())
  }
}