bpo-33261: guard access to __code__ attribute in inspect (GH-6448)

Lib/test/inspect_fodder.py

@@ -80,3 +80,14 @@ try:
     raise Exception()
 except:
     tb = sys.exc_info()[2]
+
+class Callable:
+    def __call__(self, *args):
+        return args
+
+    def as_method_of(self, obj):
+        from types import MethodType
+        return MethodType(self, obj)
+
+custom_method = Callable().as_method_of(42)
+del Callable