Somebody made list.__dict__ grow a '__doc__' key, but apparently didn't
run the test suite afterwards.  Either that, or whether '__doc__' shows
up is platform-dependent!
diff --git a/Lib/test/test_descrtut.py b/Lib/test/test_descrtut.py
index eb44200..ee19fa3 100644
--- a/Lib/test/test_descrtut.py
+++ b/Lib/test/test_descrtut.py
@@ -191,6 +191,7 @@
      '__delattr__',
      '__delitem__',
      '__delslice__',
+     '__doc__',
      '__eq__',
      '__ge__',
      '__getattribute__',