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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def returns(self) -> T.Optional[DocstringReturns]: """Return return information indicated in docstring."""

        try:
            return next(
                DocstringReturns.from_meta(meta)
                for meta in self.meta
                if meta.args[0] in {"return", "returns", "yield", "yields"}
            )
        except StopIteration:
            return None