NamedTuple classes (of all kinds) have a __slots__ attribute generated for them at runtime (it's always an empty tuple):

>>> import collections, typing
>>> A = collections.namedtuple("A", ())
>>> B = typing.NamedTuple("B", ())
>>> class C(typing.NamedTuple): ...
... 
>>> A.__slots__
()
>>> B.__slots__
()
>>> C.__slots__
()

We currently emit a false-positive on the C.__slots__ attribute access above, and after astral-sh/ruff#22327 we will also start emitting false-positive errors on the A.__slots__ and B.__slots__ attribute accesses too. We should fix this by synthesizing the generated __slots__ attribute for these classes.