When dealing with __import__ for detecting a global state change made by a

test, make sure to check if __builtins__ is a dict or not.

Discovered when running importlib.test.regrtest.

Lib/test/regrtest.py

@@ -859,8 +859,14 @@ class saved_test_environment:
         sys.path_hooks[:] = saved_hooks[2]
 
     def get___import__(self):
+        if isinstance(__builtins__, dict):
+            return __builtins__['__import__']
+        else:
             return __builtins__.__import__
     def restore___import__(self, import_):
+        if isinstance(__builtins__, dict):
+            __builtins__['__import__'] = import_
+        else:
             __builtins__.__import__ = import_
 
     def get_warnings_filters(self):