Problem using ParseResult (from parsing combinators)

I'm trying to create a parse-tree handler, like this ...
import scala.util.parsing.combinator.Parsers.ParseResult trait TreeHandler {  def onParse(tree: ParseResult[_]) {     // ...  }}
But the import (for ParseResult) just wont compile:
scala> import scala.util.parsing.combinator.Parsers.ParseResult<console>:5: error: value Parsers is not a member of package scala.util.parsing.combinator        import scala.util.parsing.combinator.Parsers.ParseResult                                            ^
How do I get this to work? 
I'm using the Scala nightly build from 2nd March '10, and JDK 1.6.0 update 18 on Windows-XP.
Thanks for any help.
- Sanjay