diff -r 57df3d7b4a25 -r fa187fa5b642 progs/app8.scala
--- a/progs/app8.scala	Wed Oct 30 03:36:10 2013 +0000
+++ b/progs/app8.scala	Wed Oct 30 03:44:40 2013 +0000
@@ -1,3 +1,9 @@
+class AltParser[I, T](p: => Parser[I, T], 
+                      q: => Parser[I, T]) 
+                          extends Parser[I, T] {
+  def parse(sb: I) = p.parse(sb) ++ q.parse(sb)   
+}
+
 class SeqParser[I, T, S](p: => Parser[I, T], 
                          q: => Parser[I, S]) 
                              extends Parser[I, (T, S)] {
@@ -7,14 +13,8 @@
             yield ((head1, head2), tail2)
 }
 
-class AltParser[I, T](p: => Parser[I, T], 
-                      q: => Parser[I, T]) 
-                          extends Parser[I, T] {
-  def parse(sb: I) = p.parse(sb) ++ q.parse(sb)   
-}
-
 class FunParser[I, T, S](p: => Parser[I, T], f: T => S) 
-  extends Parser[I, S] {
+                                  extends Parser[I, S] {
   def parse(sb: I) = 
     for ((head, tail) <- p.parse(sb)) 
       yield (f(head), tail)