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Description
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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