Only expose the abstract base classes.
The concrete types are for internal use (registration).
Keep from accidentally resurrecting the types module in collections.
diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index cc00fd9..7890e97 100644
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -18,11 +18,6 @@
"MappingView", "KeysView", "ItemsView", "ValuesView",
"Sequence", "MutableSequence",
"ByteString",
- "bytearray_iterator", "bytes_iterator", "dict_itemiterator",
- "dict_items", "dict_keyiterator", "dict_keys", "dict_proxy",
- "dict_valueiterator", "dict_values", "list_iterator",
- "list_reverseiterator", "range_iterator", "set_iterator",
- "str_iterator", "tuple_iterator", "zip_iterator",
]