diff --git a/bar.py b/bar.py
index a1b076eac..d8360d94e 100644
--- a/bar.py
+++ b/bar.py
@@ -4,13 +4,16 @@
 
 
 def foo(a=None):
+    breakpoint()
     print("abc")
 
 
-def bar(z=None):
+def bar(z=[]):
+    breakpoint()
     print("useless")
     assert z
 
 
 def baz(x=[]):
+    breakpoint()
     print("abc")