Eric V. Smith <e...@trueblade.com> added the comment:

I agree on your analysis. You'll get the same error on any name that type 
defines (like __class__), but "mro" looks like the only one without dunders.

I'm not sure the best way to fix this. I'll give it some thought.

Another problem is that assigning a default value breaks the .mro() call:

@dataclass
class A:
    mro: object = 3

>>> A.mro()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45531>
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