def ConsumeInt64(self):
try:<EOL><INDENT>result = ParseInteger(self.token, is_signed=True, is_long=True)<EOL><DEDENT>except ValueError as e:<EOL><INDENT>raise self._ParseError(str(e))<EOL><DEDENT>self.NextToken()<EOL>return result<EOL>
Consumes a signed 64bit integer number.

        Returns:
          The integer parsed.

        Raises:
          ParseError: If a signed 64bit integer couldn't be consumed.