diff -r 47f86885d481 -r e85600529ca5 app7.scala
--- a/app7.scala	Sun Dec 23 00:38:56 2012 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,16 +0,0 @@
-abstract class Parser[I, T] {
-  def parse(ts: I): Set[(T, I)]
-
-  def parse_all(ts: I) : Set[T] =
-    for ((head, tail) <- parse(ts); if (tail.isEmpty)) 
-      yield head
-
-  def || (right : => Parser[I, T]) : Parser[I, T] = 
-      new AltParser(this, right)
-  def ==>[S] (f: => T => S) : Parser [I, S] = 
-      new FunParser(this, f)
-   def ~[S] (right : => Parser[I, S]) : Parser[I, (T, S)] = 
-      new SeqParser(this, right)
-}
-
-