fn try_poll_next_unpin(
        &mut self,
        cx: &mut Context<'_>,
    ) -> Poll<Option<Result<Self::Ok, Self::Error>>>
    where
        Self: Unpin,
    {
        Pin::new(self).try_poll_next(cx)
    }
A convenience method for calling [`TryStream::try_poll_next`] on [`Unpin`]
stream types.
futures-util/src/stream/try_stream/mod.rs