65 lazy val T: Parser[String, Int] = 

    65 lazy val T: Parser[String, Int] = 

    66   (F ~ "*" ~ T) ==> { case ((x, y), z) => x * z} || F

    66   (F ~ "*" ~ T) ==> { case ((x, y), z) => x * z} || F

    67 lazy val F: Parser[String, Int] = 

    67 lazy val F: Parser[String, Int] = 

    68   ("(" ~ E ~ ")") ==> { case ((x, y), z) => y} || NumParser

    68   ("(" ~ E ~ ")") ==> { case ((x, y), z) => y} || NumParser

    69 

    69 

    70 println(E.parse_all("1+2+3"))

    73 println(E.parse_all("1+2+3"))

    71 println(E.parse_all("1+2*3+1"))

    74 println(E.parse_all("1+2*3+1"))

    72 

    75 

    73 

    76 

    74 // no left-recursion allowed

    77 // no left-recursion allowed