fix node traversal in yield expressions

diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index d985cedb04baebab55f7df71b0236ecff02a101a..5273419bfac2bb8dc258b84e2dadd644d49c3fdf 100755 (executable)
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -4497,7 +4497,7 @@ class YieldExprNode(ExprNode):
     # arg         ExprNode   the value to return from the generator
     # label_name  string     name of the C label used for this yield
 
-    subexprs = []
+    subexprs = ['arg']
     type = py_object_type
 
     def analyse_types(self, env):