diff --git a/demo_code.py b/demo_code.py
index 68313e68b..65eebb2e7 100644
--- a/demo_code.py
+++ b/demo_code.py
@@ -128,6 +128,9 @@ def chained_comparison():
     c = 3
     return a < b and b < c
 
+def foo():
+    return 1
+
 def wrong_callable():
     number = ImaginaryNumber()
     if hasattr(number, '__call__'):