TC & ASC Implemented. yyerrors updated.

tests/sprint2/test/sp2_llnode.alpha

@@ -21,7 +21,7 @@ make_list (a) := {
     } else {
         ret := reserve ret;
         ret.prev := null;
-        ret.next := null;
+        ret.next :s= null;g
         ret.val  := a;
         while (0 < a) {
             temp := reserve temp;