NamedTuples cannot have nested classes #15775

>>> from typing import NamedTuple
>>> class A(NamedTuple):
...     class B: ...
... 
>>> A.B
<class '__main__.A.B'>
>>> A().B
<class '__main__.A.B'>

from typing import NamedTuple

class A(NamedTuple):
    class B: ...  # E: Invalid statement in NamedTuple definition; expected "field_name: field_type [= default]"

reveal_type(A.B)  # E: "type[A]" has no attribute "B"
# N: Revealed type is "Any"