[issue46431] Trouble subclassing ExceptionGroup

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

Thanks for looking into it!

> If you don't define derive the superclass constructor is used, which means you get something of type ExceptionGroup, not your subclass.

That might be fine in my case (for a MVP at least). Is there any other danger in not overriding it?
I see the docs say "A subclass needs to override it", but it might be better to enumerate the perils, or if such a class is unusable, not allow creating it.

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<https://bugs.python.org/issue46431>
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