diff -r 0451b8b67f62 -r c6a1e19e9801 progs/comb1.scala
--- a/progs/comb1.scala	Thu Oct 25 06:53:16 2018 +0100
+++ b/progs/comb1.scala	Thu Oct 25 18:36:04 2018 +0100
@@ -38,6 +38,7 @@
 }
 
 import scala.util.matching.Regex
+
 case class RegexParser(reg: Regex) extends Parser[String, String] {
   def parse(sb: String) = reg.findPrefixMatchOf(sb) match {
     case None => Set()
@@ -51,17 +52,17 @@
 
 // convenience
 implicit def string2parser(s: String) = StringParser(s)
-implicit def char2parser(c: Char) = CharParser(c)
+//implicit def char2parser(c: Char) = CharParser(c)
 
 implicit def ParserOps[I<% Seq[_], T](p: Parser[I, T]) = new {
-  def || (q : => Parser[I, T]) = new AltParser[I, T](p, q)
+  def | (q : => Parser[I, T]) = new AltParser[I, T](p, q)
   def ==>[S] (f: => T => S) = new FunParser[I, T, S](p, f)
   def ~[S] (q : => Parser[I, S]) = new SeqParser[I, T, S](p, q)
 }
 
 implicit def StringOps(s: String) = new {
-  def || (q : => Parser[String, String]) = new AltParser[String, String](s, q)
-  def || (r: String) = new AltParser[String, String](s, r)
+  def | (q : => Parser[String, String]) = new AltParser[String, String](s, q)
+  def | (r: String) = new AltParser[String, String](s, r)
   def ==>[S] (f: => String => S) = new FunParser[String, String, S](s, f)
   def ~[S] (q : => Parser[String, S]) = 
     new SeqParser[String, String, S](s, q)