ValueClassesのバグ？

example-package.scala

package object example {

  implicit class Foo(val foo: String) extends AnyVal {

    def hello = println("hello")
  }
}

example-sub-package.scala

package example

package object sub {

  implicit class Baa(val baa: String) extends AnyVal {

    def world = println("world")
  }
}

example-sub-Test.scala

package example
package sub

object Test extends App {

  "1".hello

  "2".world
}

gistfile1.txt

> run
[info] Compiling 1 Scala source to /Users/ueshin/workspace/valueclasses/target/scala-2.10.0-M7/classes...
[info] Running example.sub.Test 
[error] (run-main) java.lang.ClassCastException: example.sub.package$ cannot be cast to example.package$
java.lang.ClassCastException: example.sub.package$ cannot be cast to example.package$
	at example.sub.Test$delayedInit$body.apply(test.scala:6)
	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$class.main(App.scala:61)
	at example.sub.Test$.main(test.scala:4)
	at example.sub.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)
java.lang.RuntimeException: Nonzero exit code: 1
	at scala.sys.package$.error(package.scala:27)
[error] {file:/Users/ueshin/workspace/valueclasses/}default-5d25e6/compile:run: Nonzero exit code: 1
[error] Total time: 1 s, completed 2012/10/01 23:50:46