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    use futures::{Async, Poll};

    use super::{helpers, HttpHandlerTask, Writer};
    use http::{StatusCode, Version};
    use Error;

    pub(crate) struct ServerError(Version, StatusCode);

    impl ServerError {
        pub fn err(ver: Version, status: StatusCode) -> Box<HttpHandlerTask> {
            Box::new(ServerError(ver, status))
        }
    }

    impl HttpHandlerTask for ServerError {
        fn poll_io(&mut self, io: &mut Writer) -> Poll<bool, Error> {
            {
                let bytes = io.buffer();
                helpers::write_status_line(self.0, self.1.as_u16(), bytes);
            }
            io.set_date();
            Ok(Async::Ready(true))
        }
    }

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