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[3.7] Documentation update for bpo-32996 fix (GH-16646) #16648

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[3.7] Documentation update for bpo-32996 fix (GH-16646) #16648

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7 changes: 4 additions & 3 deletions Doc/library/typing.rst
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Expand Up @@ -306,9 +306,10 @@ User defined generic type aliases are also supported. Examples::
def inproduct(v: Vec[T]) -> T: # Same as Iterable[Tuple[T, T]]
return sum(x*y for x, y in v)

The metaclass used by :class:`Generic` is a subclass of :class:`abc.ABCMeta`.
A generic class can be an ABC by including abstract methods or properties,
and generic classes can also have ABCs as base classes without a metaclass
.. versionchanged:: 3.7
:class:`Generic` no longer has a metaclass.

A user-defined generic class can have ABCs as base classes without a metaclass
conflict. Generic metaclasses are not supported. The outcome of parameterizing
generics is cached, and most types in the typing module are hashable and
comparable for equality.
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