Nick Coghlan <ncogh...@gmail.com> added the comment:

I think it would make sense to remove the exception wrapping from the 
__set_name__ calls - I don't think we're improving the ease of understanding 
the tracebacks by converting everything to a generic RuntimeError, and we're 
hurting the UX of descriptor validation cases like this one.

[1] https://github.com/python/cpython/blob/master/Objects/typeobject.c#L7263

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