bug with ctrie-new and ctrie-old

gistfile1

object Test extends App {
  class Modifier extends Thread {
    setName("Modifier %d".format(0))
  }

  val ct = new scala.collection.concurrent.TrieMap[Int, Int]
  new Modifier
}

C:\Projects\Kepler\sandbox @ ticket/6246>myke run Test.scala
java.lang.NullPointerException
at java.lang.reflect.Array.newArray(Native Method)
at java.lang.reflect.Array.newInstance(Array.java:52)
at scala.reflect.ClassTag$class.newArray(ClassTag.scala:50)
at scala.reflect.ManifestFactory$ClassTypeManifest.newArray(Manifest.scala:225)
at scala.collection.TraversableOnce$class.toArray(TraversableOnce.scala:234)
at scala.collection.AbstractTraversable.toArray(Traversable.scala:105)
at scala.collection.immutable.StringLike$class.format(StringLike.scala:266)
at scala.collection.immutable.StringOps.format(StringOps.scala:31)
at Test$Modifier.(Test.scala:3)
at Test$delayedInit$body.apply(Test.scala:7)
at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at scala.App$$anonfun$main$1.apply(App.scala:61)
at scala.App$$anonfun$main$1.apply(App.scala:61)
at scala.collection.immutable.List.foreach(List.scala:309)
at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:32)
at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45)
at scala.App$class.main(App.scala:61)
at Test$.main(Test.scala:1)
at Test.main(Test.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at scala.tools.nsc.util.ScalaClassLoader$$anonfun$run$1.apply(ScalaClassLoader.scala:71)
at scala.tools.nsc.util.ScalaClassLoader$class.asContext(ScalaClassLoader.scala:31)
at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.asContext(ScalaClassLoader.scala:139)
at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:71)
at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:139)
at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:28)
at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:45)
at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:35)
at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:45)
at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:74)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:96)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:105)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)