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Implement a Python function called parsestream with the following signature:

Implement a Python function called parsestream with the following signature:: a task in repo2rlenv-r2e (Harbor dataset). def parsestream( stream: str IO str , encoding: str None = None ) - Generator sql.Statement, None, None : ...

The task

def parsestream( stream: str | IO[str], encoding: str | None = None ) -> Generator[sql.Statement, None, None]: ... ```

Part of FineEnvs/repo2rlenv-r2e.