object P extends Application {

    def f = new T { val state = State.A }

    private object State extends Enumeration {
        val A, B = Value
    }

    f
}

trait T {
}

/*
Using
    private object State extends Enumeration {
we experience a runtime error:-

scalac -version
Scala compiler 2.3.3 -- (c) 2002-2007 LAMP/EPFL

scalac P.scala

scala P
java.lang.NoClassDefFoundError: P$P$$State$
        at P$$anon$0.<init>(P.scala:4)
        at P$.f(P.scala:4)
        at P$.<init>(P.scala:10)
        at P$.<clinit>(P.scala)
        at P.main(P.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:76)
        at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:107)
        at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)


Using
    object State extends Enumeration {
or
    private[P] object State extends Enumeration {
we have successful execution.
*/