Comment highlighted as error

Firstly: Scala development in IDEA with the Scala plugin is excellent!  I'm using it for a large multi-module project and it mostly 'just works'.  Very nice work.

I've found a couple of weird cases with the error highlighting, though.  
Here's a simple example where it thinks a comment is a syntax error:

class IDEAHighlight1 {
  def comments: Unit = {
    Some("foo")
      .map { _.toString } // comment here is fine
      .map { _.length }
      // comment here seen as syntax error
      .map { _ + 3 }
  }
}