Subclass definitions should be validated against superclass __init_subclass__ definitions #1541
Description
Summary
The Bar definition here fails at runtime, but we currently don't catch the error:
class Foo:
def __init_subclass__(cls, arg: int): ...
class Bar(Foo): ...>>> class Bar(Foo): ...
...
Traceback (most recent call last):
File "<python-input-2>", line 1, in <module>
class Bar(Foo): ...
TypeError: Foo.__init_subclass__() missing 1 required positional argument: 'arg'In order for it to succeed, it would need to be something like
class Foo:
def __init_subclass__(cls, arg: int): ...
class Bar(Foo, arg=42): ...Version
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