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mypy dislikes next() on file objects #2111

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@jhagerer

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@jhagerer

When mypy analyzes the following code:

filename = 'some.txt'
with open(filename) as fh:
    c = cast(TextIOWrapper, fh)
    next(c)  # skip line

it yields the following error:
error: No overload variant of "next" matches argument types [io.TextIOWrapper]

Since TextIOWrapper implements the next() method (which is even autocompleted by PyCharm IDE), I would not expect this error to be thrown.

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