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bpo-46246: add missing __slots__ to importlib.metadata.DeprecatedList (GH-30452)

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Confirmed with @jaraco that this indeed needs a fix.

A question that came up while I was digging into the code: I think `SelectableGroups` could similarly use `__slots__ = ()`, since its purpose seems only for convenience around `dict`, not to have attributes of its own.

Automerge-Triggered-By: GH:jaraco
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Arie Bovenberg 2022-02-11 01:56:21 +01:00 • committed by GitHub
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Lib/importlib/metadata/__init__.py
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@ -278,6 +278,8 @@ class DeprecatedList(list):
1
"""
__slots__ = ()
_warn = functools.partial(
warnings.warn,
"EntryPoints list interface is deprecated. Cast to list if needed.",