From 1cdc7a0e88273dc7683cb8e123edffb4cda80d1e Mon Sep 17 00:00:00 2001
From: Alexey Shrub <ashrub@yandex.ru>
Date: Wed, 24 Oct 2018 19:33:07 +0300
Subject: [PATCH] Fix Python 2 error with return from generator

---
 lark/tree.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lark/tree.py b/lark/tree.py
index 137ad2b..b2c7a60 100644
--- a/lark/tree.py
+++ b/lark/tree.py
@@ -103,7 +103,8 @@ class Tree(object):
 
     def iter_subtrees_topdown(self):
         if not self.children:
-            return self
+            yield self
+            return
 
         stack = [self]
         while stack: