Added support for the minus operator.

sample-programs/basic-1

@@ -24,11 +24,10 @@ fibbonaci x = case x of {
     0 => 0,
     1 => 1,
     -- abusing overflows to represent negatives like a boss
-    _ =>   (fibbonaci (x + 9223372036854775807 + 9223372036854775807))
-         + (fibbonaci (x + 9223372036854775807 + 9223372036854775807 + 1))
+    _ =>   (fibbonaci (x - 2))
+         + (fibbonaci (x - 1))
 } : Int;
 
-faccer : Int -> Int;
 
 main : Int;
 main = fibbonaci 10;