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class Force {
val t1 = new Thread {
override def run(): Unit = {
scala.`package`
}
}
val t2 = new Thread {
override def run(): Unit = {
scala.Predef
}
}
t1.start()
t2.start()
t1.join()
t2.join()
}
object Test {
def main(args: Array[String]): Unit = {
new Force()
}
}
/* Was deadlocking:
"Thread-2" prio=5 tid=7f9637268000 nid=0x119601000 in Object.wait() [119600000]
java.lang.Thread.State: RUNNABLE
at scala.Predef$.<init>(Predef.scala:90)
at scala.Predef$.<clinit>(Predef.scala)
at Force$$anon$2.run(predef-cycle.scala:10)
"Thread-1" prio=5 tid=7f9637267800 nid=0x1194fe000 in Object.wait() [1194fb000]
java.lang.Thread.State: RUNNABLE
at scala.collection.immutable.Set$Set4.$plus(Set.scala:127)
at scala.collection.immutable.Set$Set4.$plus(Set.scala:121)
at scala.collection.mutable.SetBuilder.$plus$eq(SetBuilder.scala:24)
at scala.collection.mutable.SetBuilder.$plus$eq(SetBuilder.scala:22)
at scala.collection.generic.Growable$$anonfun$$plus$plus$eq$1.apply(Growable.scala:48)
at scala.collection.generic.Growable$$anonfun$$plus$plus$eq$1.apply(Growable.scala:48)
at scala.collection.immutable.List.foreach(List.scala:318)
at scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:48)
at scala.collection.mutable.SetBuilder.$plus$plus$eq(SetBuilder.scala:22)
at scala.collection.TraversableLike$class.to(TraversableLike.scala:629)
at scala.collection.AbstractTraversable.to(Traversable.scala:105)
at scala.collection.TraversableOnce$class.toSet(TraversableOnce.scala:267)
at scala.collection.AbstractTraversable.toSet(Traversable.scala:105)
at scala.runtime.ScalaRunTime$.<init>(ScalaRunTime.scala:50)
at scala.runtime.ScalaRunTime$.<clinit>(ScalaRunTime.scala)
at scala.collection.mutable.HashTable$HashUtils$class.elemHashCode(HashTable.scala)
at scala.collection.mutable.HashMap.elemHashCode(HashMap.scala:39)
at scala.collection.mutable.HashTable$class.findOrAddEntry(HashTable.scala:161)
at scala.collection.mutable.HashMap.findOrAddEntry(HashMap.scala:39)
at scala.collection.mutable.HashMap.put(HashMap.scala:75)
at scala.collection.mutable.HashMap.update(HashMap.scala:80)
at scala.sys.SystemProperties$.addHelp(SystemProperties.scala:64)
at scala.sys.SystemProperties$.bool(SystemProperties.scala:68)
at scala.sys.SystemProperties$.noTraceSupression$lzycompute(SystemProperties.scala:80)
- locked <7b8b0e228> (a scala.sys.SystemProperties$)
at scala.sys.SystemProperties$.noTraceSupression(SystemProperties.scala:80)
at scala.util.control.NoStackTrace$.<init>(NoStackTrace.scala:31)
at scala.util.control.NoStackTrace$.<clinit>(NoStackTrace.scala)
at scala.util.control.NoStackTrace$class.fillInStackTrace(NoStackTrace.scala:22)
at scala.util.control.BreakControl.fillInStackTrace(Breaks.scala:93)
at java.lang.Throwable.<init>(Throwable.java:181)
at scala.util.control.BreakControl.<init>(Breaks.scala:93)
at scala.util.control.Breaks.<init>(Breaks.scala:28)
at scala.collection.Traversable$.<init>(Traversable.scala:96)
at scala.collection.Traversable$.<clinit>(Traversable.scala)
at scala.package$.<init>(package.scala:46)
at scala.package$.<clinit>(package.scala)
at Force$$anon$1.run(predef-cycle.scala:4)
*/
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