parse functions return a Node instance

parser/parserules.py

@@ -1,6 +1,7 @@
 
 from lexrules import tokens
+from Node import Node
 
 def p_c_expr(p):
     'c_expr : C LPAREN STRING RPAREN SEMICOLON'
-    p[0] = 'success'
+    p[0] = Node('c_expr', data=p[3])