Nick Coghlan added the comment:

The "used directly as the metaclass" is a reference to 
https://docs.python.org/3/reference/datamodel.html#creating-the-class-object 
further down, and specifically the "metaclass(name, bases, namespace, **kwds)" 
call. It's not saying Python has a way to bypass that instantiation process.

As a result, your code is consistently getting to that step just fine, but 
*that call* is throwing an exception.

Hence my comment earlier that there's a case to be made that we should be 
better indicating where we were in the type creation process when the metaclass 
resolution failed.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28437>
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