diff -r 553b4d4e3719 -r c6c79d21f8a8 progs/comb1.scala
--- a/progs/comb1.scala	Wed Nov 06 21:52:42 2019 +0000
+++ b/progs/comb1.scala	Wed Nov 06 23:17:05 2019 +0000
@@ -12,7 +12,7 @@
 
   def parse_all(ts: I) : Set[T] =
     for ((head, tail) <- parse(ts); 
-        if (tail.isEmpty)) yield head
+        if tail.isEmpty) yield head
 }
 
 class SeqParser[I : IsSeq, T, S](p: => Parser[I, T], 
@@ -162,8 +162,6 @@
 //println(EL.parse_all("1+2+3"))
 
 
-
-
 // non-ambiguous vs ambiguous grammars
 
 // ambiguous
@@ -207,8 +205,6 @@
 (One || Two).parse("111")
 
 
-
-
 // a problem with the arithmetic expression parser -> gets 
 // slow with deep nestedness
 E.parse("1")