A problem parsing/compiling a basic scala compilation unit

Using scala plugin 0.2.25444 for Intellij 9.0M1 on OS X:

The following fails to compile yielding an error with no error text:

object HelloWorld  {
  def main(args: Array[String]) {
    println("hello")
  }
}

If I append "; foo" to the above code as shown below it compiles without error:

object HelloWorld  {
  def main(args: Array[String]) {
    println("hello")
  }
}; foo

I'm attempting to use Intellij as a platform to teach myself Scala,
but this seems like a fairly basic mistake...

Any ideas?