From 738d423a5c790651ec10eaab4d23dd951b33db91 Mon Sep 17 00:00:00 2001
From: Daniel Xu <niellxu@yahoo.ca>
Date: Sun, 2 Jun 2019 17:29:34 -0400
Subject: [PATCH] Updated function name

---
 ast.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ast.py b/ast.py
index acbad31..ffa6e0b 100644
--- a/ast.py
+++ b/ast.py
@@ -67,7 +67,7 @@ def add(self, sym):
             self.root = node(sym, None)
             self.cur = self.root
         else:
-            if expr.is_symbol(sym) or expr.is_func(sym):
+            if expr.is_operator(sym) or expr.is_func(sym):
                 if self.cur.right is None:
                     self.cur.right = node(sym, self.cur)
                     self.cur = self.cur.right