def first_line(self, lineno: TLineNo) -> TLineNo:
        """Return the first line number of the statement including `lineno`."""
        if lineno < 0:
            lineno = -self._multiline.get(-lineno, -lineno)
        else:
            lineno = self._multiline.get(lineno, lineno)
        return lineno
Return the first line number of the statement including `lineno`.
coverage/parser.py