Fun with units

gistfile1.txt

Welcome to Scala version 2.10.0-20120418-145922-016bc3db52 (Java HotSpot(TM) 64-Bit Server VM, Java
1.6.0_25).
Type in expressions to have them evaluated.
Type :help for more information.

scala> Array[Unit]((), ())
typechecking macro expansion materializeClassTag[Unit](`package`.this.mirror) at source-<console>,li
ne-8,offset=101
ClassTag.Unit
Select(Ident(newTermName("ClassTag")), newTermName("Unit"))
res0: Array[Unit] = Array((), ())

scala> res0.getClass
res1: Class[_ <: Array[Unit]] = class [Lscala.runtime.BoxedUnit;

scala> res0(0).getClass
res2: Class[Unit] = void

scala> new Array[Unit](2)
res3: Array[Unit] = Array((), ())

scala> res3.getClass
res4: Class[_ <: Array[Unit]] = class [Lscala.runtime.BoxedUnit;

scala> res3(0).getClass
scala.MatchError: null
        at scala.runtime.ScalaRunTime$.anyValClass(ScalaRunTime.scala:54)
        at .<init>(<console>:8)
        at .<clinit>(<console>)
        at .<init>(<console>:7)
        at .<clinit>(<console>)
        at $print(<console>)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:775)
        at scala.tools.nsc.interpreter.IMain$Request$$anonfun$16.apply(IMain.scala:1039)
        at scala.tools.nsc.interpreter.Line.scala$tools$nsc$interpreter$Line$$runAndSetState(Line.scala:41)
        at scala.tools.nsc.interpreter.Line$$anonfun$2.apply$mcV$sp(Line.scala:47)
        at scala.tools.nsc.io.package$$anon$2.run(package.scala:22)
        at java.lang.Thread.run(Thread.java:662)


scala> res3(0)

scala> val x = res3(0)
x: Unit = ()

scala> x.getClass
res7: Class[Unit] = void