Scala Parser Combinators - SMALL Working Example

I'm trying to get even a naive example of Scala's Parser Combinators to work
without success.

Looking at the PDF "Parser Combinators in Scala" the following example is
given:

import scala.util.parsing.combinator.syntactical.StdTokenParsers
import scala.util.parsing.combinator.lexical.StdLexical

object ArithmeticParser extends StdTokenParsers with Application {
type Tokens = StdLexical

val lexical = new StdLexical

lexical.delimiters ++= List("(", ")", "+", "-", "*", "/")

def factor: Parser[Int] = "(" ~ expr ~ ")" | numericLit ^^ (_.toInt)

def expr = term* ("+" ^^ { (x: Int, y: Int) => x + y } |
"-" ^^ { (x: Int, y: Int) => x - y })

def term = factor* ("*" ^^ { (x: Int, y: Int) => x * y } |
"/" ^^ { (x: Int, y: Int) => x / y })

Console.println (expr (new lexical.Scanner ("1+2*3*7-1") ))
}

However it fails to compile for me. Does anyone have a small similar
example of anykind, shape or form of using Scala's Parser Combinators which
works with the current 2.7.3 compiler?

Thank you.