diff -r 68fab15cd6fb -r 5c28e4134ee1 progs/comb2.scala
--- a/progs/comb2.scala	Wed Oct 25 00:05:59 2017 +0100
+++ b/progs/comb2.scala	Tue Oct 31 21:32:12 2017 +0000
@@ -4,6 +4,7 @@
 import scala.language.implicitConversions
 import scala.language.reflectiveCalls
 
+
 abstract class Parser[I <% Seq[_], T] {
   def parse(ts: I): Set[(T, I)]
 
@@ -70,6 +71,7 @@
 lazy val F: Parser[String, Int] = 
   ("(" ~ E ~ ")") ==> { case ((x, y), z) => y} || NumParser
 
+println(E.parse_all("123"))
 println(E.parse_all("1*2+3"))
 println(E.parse_all("1+2*3"))
 println(E.parse_all("1+2+3"))