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Temporarily fixes #305.
Specifically, this error is being caused by this line:
https://github.com/python/mypy/blob/e4355948d797600c7b76da0a916fc5f29d10448e/mypy/traverser.py#L97
Because
TraverserVisitor
now is atrait
you cannot extend from it. There doesn't seem to be a way to get around this on my end, so I'm pinning Mypy as a workaround until I find a solution or something changes upstream with Mypy.