Add missing parameter spotted by Jared Flatow
diff --git a/Parser/asdl.py b/Parser/asdl.py
index 8fbd9ec..71d3be7 100644
--- a/Parser/asdl.py
+++ b/Parser/asdl.py
@@ -181,7 +181,7 @@
         " sum ::= constructor """
         return [constructor[0]]
 
-    def p_sum_1(self, ):
+    def p_sum_1(self, info):
         " sum ::= constructor | sum "
         constructor, _, sum = info
         return [constructor] + sum