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// use std::pin::Pin;
// use std::task::{self, Poll};
// use std::{fmt, io};
// /// An upgraded HTTP connection.
// pub struct Upgraded {
// inner: hyper::upgrade::Upgraded,
// }
// impl AsyncRead for Upgraded {
// fn poll_read(
// mut self: Pin<&mut Self>,
// cx: &mut task::Context<'_>,
// buf: &mut ReadBuf<'_>,
// ) -> Poll<io::Result<()>> {
// Pin::new(&mut self.inner).poll_read(cx, buf)
// }
// }
// impl AsyncWrite for Upgraded {
// fn poll_write(
// mut self: Pin<&mut Self>,
// cx: &mut task::Context<'_>,
// buf: &[u8],
// ) -> Poll<io::Result<usize>> {
// Pin::new(&mut self.inner).poll_write(cx, buf)
// }
// fn poll_write_vectored(
// mut self: Pin<&mut Self>,
// cx: &mut task::Context<'_>,
// bufs: &[io::IoSlice<'_>],
// ) -> Poll<io::Result<usize>> {
// Pin::new(&mut self.inner).poll_write_vectored(cx, bufs)
// }
// fn poll_flush(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<io::Result<()>> {
// Pin::new(&mut self.inner).poll_flush(cx)
// }
// fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<io::Result<()>> {
// Pin::new(&mut self.inner).poll_shutdown(cx)
// }
// fn is_write_vectored(&self) -> bool {
// self.inner.is_write_vectored()
// }
// }
// impl fmt::Debug for Upgraded {
// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// f.debug_struct("Upgraded").finish()
// }
// }
// impl From<hyper::upgrade::Upgraded> for Upgraded {
// fn from(inner: hyper::upgrade::Upgraded) -> Self {
// Upgraded { inner }
// }
// }
// impl super::response::Response {
// /// Consumes the response and returns a future for a possible HTTP upgrade.
// pub fn upgrade(self) -> crate::Result<Upgraded> {
// hyper::upgrade::on(self.res)
// .map_ok(Upgraded::from)
// .map_err(crate::error::upgrade)
// }
// }