Trait futures::prelude::Sink

#[must_use = "sinks do nothing unless polled"]
pub trait Sink<Item> {
    type Error;
    fn poll_ready(
        self: Pin<&mut Self>, 
        cx: &mut Context
    ) -> Poll<Result<(), Self::Error>>;
    fn start_send(self: Pin<&mut Self>, item: Item) -> Result<(), Self::Error>;
    fn poll_flush(
        self: Pin<&mut Self>, 
        cx: &mut Context
    ) -> Poll<Result<(), Self::Error>>;
    fn poll_close(
        self: Pin<&mut Self>, 
        cx: &mut Context
    ) -> Poll<Result<(), Self::Error>>;
}

A Sink is a value into which other values can be sent, asynchronously.

Basic examples of sinks include the sending side of:

• Channels
• Sockets
• Pipes

In addition to such "primitive" sinks, it's typical to layer additional functionality, such as buffering, on top of an existing sink.

Sending to a sink is "asynchronous" in the sense that the value may not be sent in its entirety immediately. Instead, values are sent in a two-phase way: first by initiating a send, and then by polling for completion. This two-phase setup is analogous to buffered writing in synchronous code, where writes often succeed immediately, but internally are buffered and are actually written only upon flushing.

In addition, the Sink may be full, in which case it is not even possible to start the sending process.

As with Future and Stream, the Sink trait is built from a few core required methods, and a host of default methods for working in a higher-level way. The Sink::send_all combinator is of particular importance: you can use it to send an entire stream to a sink, which is the simplest way to ultimately consume a stream.

Associated Types

type Error

The type of value produced by the sink when an error occurs.

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Required methods

fn poll_ready(
    self: Pin<&mut Self>,
    cx: &mut Context
) -> Poll<Result<(), Self::Error>>

Attempts to prepare the Sink to receive a value.

This method must be called and return Poll::Ready(Ok(())) prior to each call to start_send.

This method returns Poll::Ready once the underlying sink is ready to receive data. If this method returns Poll::Pending, the current task is registered to be notified (via cx.waker().wake_by_ref()) when poll_ready should be called again.

In most cases, if the sink encounters an error, the sink will permanently be unable to receive items.

fn start_send(self: Pin<&mut Self>, item: Item) -> Result<(), Self::Error>

Begin the process of sending a value to the sink. Each call to this function must be preceded by a successful call to poll_ready which returned Poll::Ready(Ok(())).

As the name suggests, this method only begins the process of sending the item. If the sink employs buffering, the item isn't fully processed until the buffer is fully flushed. Since sinks are designed to work with asynchronous I/O, the process of actually writing out the data to an underlying object takes place asynchronously. You must use poll_flush or poll_close in order to guarantee completion of a send.

Implementations of poll_ready and start_send will usually involve flushing behind the scenes in order to make room for new messages. It is only necessary to call poll_flush if you need to guarantee that all of the items placed into the Sink have been sent.

In most cases, if the sink encounters an error, the sink will permanently be unable to receive items.

fn poll_flush(
    self: Pin<&mut Self>,
    cx: &mut Context
) -> Poll<Result<(), Self::Error>>

Flush any remaining output from this sink.

Returns Poll::Ready(Ok(())) when no buffered items remain. If this value is returned then it is guaranteed that all previous values sent via start_send have been flushed.

Returns Poll::Pending if there is more work left to do, in which case the current task is scheduled (via cx.waker().wake_by_ref()) to wake up when poll_flush should be called again.

In most cases, if the sink encounters an error, the sink will permanently be unable to receive items.

fn poll_close(
    self: Pin<&mut Self>,
    cx: &mut Context
) -> Poll<Result<(), Self::Error>>

Flush any remaining output and close this sink, if necessary.

Returns Poll::Ready(Ok(())) when no buffered items remain and the sink has been successfully closed.

Returns Poll::Pending if there is more work left to do, in which case the current task is scheduled (via cx.waker().wake_by_ref()) to wake up when poll_close should be called again.

If this function encounters an error, the sink should be considered to have failed permanently, and no more Sink methods should be called.

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Implementations on Foreign Types

impl<S, Fut, F, Item, E> Sink<Item> for TryFilter<S, Fut, F> where
    S: TryStream + Sink<Item, Error = E>, 

type Error = E

fn poll_ready(
    self: Pin<&mut TryFilter<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFilter<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut TryFilter<S, Fut, F>>,
    item: Item
) -> Result<(), <TryFilter<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut TryFilter<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFilter<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut TryFilter<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFilter<S, Fut, F> as Sink<Item>>::Error>>

impl<W, Item> Sink<Item> for IntoSink<W, Item> where
    Item: AsRef<[u8]>,
    W: AsyncWrite, 

type Error = Error

fn poll_ready(
    self: Pin<&mut IntoSink<W, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <IntoSink<W, Item> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut IntoSink<W, Item>>,
    item: Item
) -> Result<(), <IntoSink<W, Item> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut IntoSink<W, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <IntoSink<W, Item> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut IntoSink<W, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <IntoSink<W, Item> as Sink<Item>>::Error>>

impl<'_, S, Item> Sink<Item> for &'_ mut S where
    S: Sink<Item> + Unpin + ?Sized, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut &'_ mut S>,
    cx: &mut Context
) -> Poll<Result<(), <&'_ mut S as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut &'_ mut S>,
    item: Item
) -> Result<(), <&'_ mut S as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut &'_ mut S>,
    cx: &mut Context
) -> Poll<Result<(), <&'_ mut S as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut &'_ mut S>,
    cx: &mut Context
) -> Poll<Result<(), <&'_ mut S as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Box<S> where
    S: Sink<Item> + Unpin + ?Sized, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Box<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Box<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Box<S>>,
    item: Item
) -> Result<(), <Box<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Box<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Box<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Box<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Box<S> as Sink<Item>>::Error>>

impl<T> Sink<T> for VecDeque<T>

type Error = Infallible

fn poll_ready(
    self: Pin<&mut VecDeque<T>>,
    &mut Context
) -> Poll<Result<(), <VecDeque<T> as Sink<T>>::Error>>

fn start_send(
    self: Pin<&mut VecDeque<T>>,
    item: T
) -> Result<(), <VecDeque<T> as Sink<T>>::Error>

fn poll_flush(
    self: Pin<&mut VecDeque<T>>,
    &mut Context
) -> Poll<Result<(), <VecDeque<T> as Sink<T>>::Error>>

fn poll_close(
    self: Pin<&mut VecDeque<T>>,
    &mut Context
) -> Poll<Result<(), <VecDeque<T> as Sink<T>>::Error>>

impl<T> Sink<T> for Vec<T>

type Error = Infallible

fn poll_ready(
    self: Pin<&mut Vec<T>>,
    &mut Context
) -> Poll<Result<(), <Vec<T> as Sink<T>>::Error>>

fn start_send(
    self: Pin<&mut Vec<T>>,
    item: T
) -> Result<(), <Vec<T> as Sink<T>>::Error>

fn poll_flush(
    self: Pin<&mut Vec<T>>,
    &mut Context
) -> Poll<Result<(), <Vec<T> as Sink<T>>::Error>>

fn poll_close(
    self: Pin<&mut Vec<T>>,
    &mut Context
) -> Poll<Result<(), <Vec<T> as Sink<T>>::Error>>

impl<P, Item> Sink<Item> for Pin<P> where
    P: DerefMut + Unpin,
    <P as Deref>::Target: Sink<Item>, 

type Error = <<P as Deref>::Target as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Pin<P>>,
    cx: &mut Context
) -> Poll<Result<(), <Pin<P> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Pin<P>>,
    item: Item
) -> Result<(), <Pin<P> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Pin<P>>,
    cx: &mut Context
) -> Poll<Result<(), <Pin<P> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Pin<P>>,
    cx: &mut Context
) -> Poll<Result<(), <Pin<P> as Sink<Item>>::Error>>

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Implementors

impl<'_, T> Sink<T> for &'_ UnboundedSender<T>

type Error = SendError

fn poll_ready(
    self: Pin<&mut &'_ UnboundedSender<T>>,
    cx: &mut Context
) -> Poll<Result<(), <&'_ UnboundedSender<T> as Sink<T>>::Error>>

fn start_send(
    self: Pin<&mut &'_ UnboundedSender<T>>,
    msg: T
) -> Result<(), <&'_ UnboundedSender<T> as Sink<T>>::Error>

fn poll_flush(
    self: Pin<&mut &'_ UnboundedSender<T>>,
    &mut Context
) -> Poll<Result<(), <&'_ UnboundedSender<T> as Sink<T>>::Error>>

fn poll_close(
    self: Pin<&mut &'_ UnboundedSender<T>>,
    &mut Context
) -> Poll<Result<(), <&'_ UnboundedSender<T> as Sink<T>>::Error>>

impl<A, B, Item> Sink<Item> for Either<A, B> where
    A: Sink<Item>,
    B: Sink<Item, Error = <A as Sink<Item>>::Error>, 

type Error = <A as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Either<A, B>>,
    cx: &mut Context
) -> Poll<Result<(), <Either<A, B> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Either<A, B>>,
    item: Item
) -> Result<(), <Either<A, B> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Either<A, B>>,
    cx: &mut Context
) -> Poll<Result<(), <Either<A, B> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Either<A, B>>,
    cx: &mut Context
) -> Poll<Result<(), <Either<A, B> as Sink<Item>>::Error>>

impl<Fut, Item> Sink<Item> for TryFlattenStream<Fut> where
    Fut: TryFuture,
    <Fut as TryFuture>::Ok: TryStream,
    <Fut as TryFuture>::Ok: Sink<Item>,
    <<Fut as TryFuture>::Ok as TryStream>::Error == <Fut as TryFuture>::Error,
    <<Fut as TryFuture>::Ok as Sink<Item>>::Error == <Fut as TryFuture>::Error, 

type Error = <Fut as TryFuture>::Error

fn poll_ready(
    self: Pin<&mut TryFlattenStream<Fut>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFlattenStream<Fut> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut TryFlattenStream<Fut>>,
    item: Item
) -> Result<(), <TryFlattenStream<Fut> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut TryFlattenStream<Fut>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFlattenStream<Fut> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut TryFlattenStream<Fut>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFlattenStream<Fut> as Sink<Item>>::Error>>

impl<Fut, Si, Item> Sink<Item> for FlattenSink<Fut, Si> where
    Fut: TryFuture<Ok = Si>,
    Si: Sink<Item, Error = <Fut as TryFuture>::Error>, 

type Error = <Fut as TryFuture>::Error

fn poll_ready(
    self: Pin<&mut FlattenSink<Fut, Si>>,
    cx: &mut Context
) -> Poll<Result<(), <FlattenSink<Fut, Si> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut FlattenSink<Fut, Si>>,
    item: Item
) -> Result<(), <FlattenSink<Fut, Si> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut FlattenSink<Fut, Si>>,
    cx: &mut Context
) -> Poll<Result<(), <FlattenSink<Fut, Si> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut FlattenSink<Fut, Si>>,
    cx: &mut Context
) -> Poll<Result<(), <FlattenSink<Fut, Si> as Sink<Item>>::Error>>

impl<S, E, Item> Sink<Item> for ErrInto<S, E> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut ErrInto<S, E>>,
    cx: &mut Context
) -> Poll<Result<(), <ErrInto<S, E> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut ErrInto<S, E>>,
    item: Item
) -> Result<(), <ErrInto<S, E> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut ErrInto<S, E>>,
    cx: &mut Context
) -> Poll<Result<(), <ErrInto<S, E> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut ErrInto<S, E>>,
    cx: &mut Context
) -> Poll<Result<(), <ErrInto<S, E> as Sink<Item>>::Error>>

impl<S, F, Item> Sink<Item> for Inspect<S, F> where
    F: FnMut(&<S as Stream>::Item),
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Inspect<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Inspect<S, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Inspect<S, F>>,
    item: Item
) -> Result<(), <Inspect<S, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Inspect<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Inspect<S, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Inspect<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Inspect<S, F> as Sink<Item>>::Error>>

impl<S, F, Item> Sink<Item> for InspectErr<S, F> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut InspectErr<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <InspectErr<S, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut InspectErr<S, F>>,
    item: Item
) -> Result<(), <InspectErr<S, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut InspectErr<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <InspectErr<S, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut InspectErr<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <InspectErr<S, F> as Sink<Item>>::Error>>

impl<S, F, Item> Sink<Item> for InspectOk<S, F> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut InspectOk<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <InspectOk<S, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut InspectOk<S, F>>,
    item: Item
) -> Result<(), <InspectOk<S, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut InspectOk<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <InspectOk<S, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut InspectOk<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <InspectOk<S, F> as Sink<Item>>::Error>>

impl<S, F, Item> Sink<Item> for MapErr<S, F> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut MapErr<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <MapErr<S, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut MapErr<S, F>>,
    item: Item
) -> Result<(), <MapErr<S, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut MapErr<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <MapErr<S, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut MapErr<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <MapErr<S, F> as Sink<Item>>::Error>>

impl<S, F, Item> Sink<Item> for MapOk<S, F> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut MapOk<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <MapOk<S, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut MapOk<S, F>>,
    item: Item
) -> Result<(), <MapOk<S, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut MapOk<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <MapOk<S, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut MapOk<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <MapOk<S, F> as Sink<Item>>::Error>>

impl<S, F, T, Item> Sink<Item> for Map<S, F> where
    F: FnMut(<S as Stream>::Item) -> T,
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Map<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Map<S, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Map<S, F>>,
    item: Item
) -> Result<(), <Map<S, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Map<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Map<S, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Map<S, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Map<S, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item> Sink<Item> for AndThen<S, Fut, F> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut AndThen<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <AndThen<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut AndThen<S, Fut, F>>,
    item: Item
) -> Result<(), <AndThen<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut AndThen<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <AndThen<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut AndThen<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <AndThen<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item> Sink<Item> for Filter<S, Fut, F> where
    F: FnMut(&<S as Stream>::Item) -> Fut,
    Fut: Future<Output = bool>,
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Filter<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Filter<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Filter<S, Fut, F>>,
    item: Item
) -> Result<(), <Filter<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Filter<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Filter<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Filter<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Filter<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item> Sink<Item> for FilterMap<S, Fut, F> where
    F: FnMut(<S as Stream>::Item) -> Fut,
    Fut: Future,
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut FilterMap<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <FilterMap<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut FilterMap<S, Fut, F>>,
    item: Item
) -> Result<(), <FilterMap<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut FilterMap<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <FilterMap<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut FilterMap<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <FilterMap<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item> Sink<Item> for OrElse<S, Fut, F> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut OrElse<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <OrElse<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut OrElse<S, Fut, F>>,
    item: Item
) -> Result<(), <OrElse<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut OrElse<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <OrElse<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut OrElse<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <OrElse<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item> Sink<Item> for SkipWhile<S, Fut, F> where
    F: FnMut(&<S as Stream>::Item) -> Fut,
    Fut: Future<Output = bool>,
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut SkipWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <SkipWhile<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut SkipWhile<S, Fut, F>>,
    item: Item
) -> Result<(), <SkipWhile<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut SkipWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <SkipWhile<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut SkipWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <SkipWhile<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item> Sink<Item> for TakeWhile<S, Fut, F> where
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut TakeWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TakeWhile<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut TakeWhile<S, Fut, F>>,
    item: Item
) -> Result<(), <TakeWhile<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut TakeWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TakeWhile<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut TakeWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TakeWhile<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item> Sink<Item> for Then<S, Fut, F> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Then<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Then<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Then<S, Fut, F>>,
    item: Item
) -> Result<(), <Then<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Then<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Then<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Then<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <Then<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item> Sink<Item> for TryFilterMap<S, Fut, F> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut TryFilterMap<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFilterMap<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut TryFilterMap<S, Fut, F>>,
    item: Item
) -> Result<(), <TryFilterMap<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut TryFilterMap<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFilterMap<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut TryFilterMap<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TryFilterMap<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Fut, F, Item, E> Sink<Item> for TrySkipWhile<S, Fut, F> where
    S: TryStream + Sink<Item, Error = E>, 

type Error = E

fn poll_ready(
    self: Pin<&mut TrySkipWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TrySkipWhile<S, Fut, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut TrySkipWhile<S, Fut, F>>,
    item: Item
) -> Result<(), <TrySkipWhile<S, Fut, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut TrySkipWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TrySkipWhile<S, Fut, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut TrySkipWhile<S, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <TrySkipWhile<S, Fut, F> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for BufferUnordered<S> where
    S: Stream + Sink<Item>,
    <S as Stream>::Item: Future, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut BufferUnordered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <BufferUnordered<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut BufferUnordered<S>>,
    item: Item
) -> Result<(), <BufferUnordered<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut BufferUnordered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <BufferUnordered<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut BufferUnordered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <BufferUnordered<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Buffered<S> where
    S: Stream + Sink<Item>,
    <S as Stream>::Item: Future, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Buffered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Buffered<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Buffered<S>>,
    item: Item
) -> Result<(), <Buffered<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Buffered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Buffered<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Buffered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Buffered<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Chunks<S> where
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Chunks<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Chunks<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Chunks<S>>,
    item: Item
) -> Result<(), <Chunks<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Chunks<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Chunks<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Chunks<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Chunks<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Enumerate<S> where
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Enumerate<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Enumerate<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Enumerate<S>>,
    item: Item
) -> Result<(), <Enumerate<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Enumerate<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Enumerate<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Enumerate<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Enumerate<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Flatten<S> where
    S: Stream + Sink<Item>,
    <S as Stream>::Item: Stream, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Flatten<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Flatten<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Flatten<S>>,
    item: Item
) -> Result<(), <Flatten<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Flatten<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Flatten<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Flatten<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Flatten<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Fuse<S> where
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Fuse<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Fuse<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Fuse<S>>,
    item: Item
) -> Result<(), <Fuse<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Fuse<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Fuse<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Fuse<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Fuse<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for IntoStream<S> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut IntoStream<S>>,
    cx: &mut Context
) -> Poll<Result<(), <IntoStream<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut IntoStream<S>>,
    item: Item
) -> Result<(), <IntoStream<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut IntoStream<S>>,
    cx: &mut Context
) -> Poll<Result<(), <IntoStream<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut IntoStream<S>>,
    cx: &mut Context
) -> Poll<Result<(), <IntoStream<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Peekable<S> where
    S: Sink<Item> + Stream, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Peekable<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Peekable<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Peekable<S>>,
    item: Item
) -> Result<(), <Peekable<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Peekable<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Peekable<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Peekable<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Peekable<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Skip<S> where
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Skip<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Skip<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Skip<S>>,
    item: Item
) -> Result<(), <Skip<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Skip<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Skip<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Skip<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Skip<S> as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for SplitSink<S, Item> where
    S: Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut SplitSink<S, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <S as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut SplitSink<S, Item>>,
    item: Item
) -> Result<(), <S as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut SplitSink<S, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <S as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut SplitSink<S, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <S as Sink<Item>>::Error>>

impl<S, Item> Sink<Item> for Take<S> where
    S: Stream + Sink<Item>, 

type Error = <S as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Take<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Take<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Take<S>>,
    item: Item
) -> Result<(), <Take<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Take<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Take<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Take<S>>,
    cx: &mut Context
) -> Poll<Result<(), <Take<S> as Sink<Item>>::Error>>

impl<S, Item, E> Sink<Item> for TryBufferUnordered<S> where
    S: TryStream + Sink<Item, Error = E>,
    <S as TryStream>::Ok: TryFuture,
    <<S as TryStream>::Ok as TryFuture>::Error == E, 

type Error = E

fn poll_ready(
    self: Pin<&mut TryBufferUnordered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <TryBufferUnordered<S> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut TryBufferUnordered<S>>,
    item: Item
) -> Result<(), <TryBufferUnordered<S> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut TryBufferUnordered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <TryBufferUnordered<S> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut TryBufferUnordered<S>>,
    cx: &mut Context
) -> Poll<Result<(), <TryBufferUnordered<S> as Sink<Item>>::Error>>

impl<S, SinkItem> Sink<SinkItem> for Compat01As03Sink<S, SinkItem> where
    S: Sink<SinkItem = SinkItem>, 

type Error = <S as Sink>::SinkError

fn start_send(
    self: Pin<&mut Compat01As03Sink<S, SinkItem>>,
    item: SinkItem
) -> Result<(), <Compat01As03Sink<S, SinkItem> as Sink<SinkItem>>::Error>

fn poll_ready(
    self: Pin<&mut Compat01As03Sink<S, SinkItem>>,
    cx: &mut Context
) -> Poll<Result<(), <Compat01As03Sink<S, SinkItem> as Sink<SinkItem>>::Error>>

fn poll_flush(
    self: Pin<&mut Compat01As03Sink<S, SinkItem>>,
    cx: &mut Context
) -> Poll<Result<(), <Compat01As03Sink<S, SinkItem> as Sink<SinkItem>>::Error>>

fn poll_close(
    self: Pin<&mut Compat01As03Sink<S, SinkItem>>,
    cx: &mut Context
) -> Poll<Result<(), <Compat01As03Sink<S, SinkItem> as Sink<SinkItem>>::Error>>

impl<Si, F, E, Item> Sink<Item> for SinkMapErr<Si, F> where
    F: FnOnce(<Si as Sink<Item>>::Error) -> E,
    Si: Sink<Item>, 

type Error = E

fn poll_ready(
    self: Pin<&mut SinkMapErr<Si, F>>,
    cx: &mut Context
) -> Poll<Result<(), <SinkMapErr<Si, F> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut SinkMapErr<Si, F>>,
    item: Item
) -> Result<(), <SinkMapErr<Si, F> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut SinkMapErr<Si, F>>,
    cx: &mut Context
) -> Poll<Result<(), <SinkMapErr<Si, F> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut SinkMapErr<Si, F>>,
    cx: &mut Context
) -> Poll<Result<(), <SinkMapErr<Si, F> as Sink<Item>>::Error>>

impl<Si, Item> Sink<Item> for Buffer<Si, Item> where
    Si: Sink<Item>, 

type Error = <Si as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Buffer<Si, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <Buffer<Si, Item> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Buffer<Si, Item>>,
    item: Item
) -> Result<(), <Buffer<Si, Item> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Buffer<Si, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <Buffer<Si, Item> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Buffer<Si, Item>>,
    cx: &mut Context
) -> Poll<Result<(), <Buffer<Si, Item> as Sink<Item>>::Error>>

impl<Si, Item, E> Sink<Item> for SinkErrInto<Si, Item, E> where
    Si: Sink<Item>,
    <Si as Sink<Item>>::Error: Into<E>, 

type Error = E

fn poll_ready(
    self: Pin<&mut SinkErrInto<Si, Item, E>>,
    cx: &mut Context
) -> Poll<Result<(), <SinkErrInto<Si, Item, E> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut SinkErrInto<Si, Item, E>>,
    item: Item
) -> Result<(), <SinkErrInto<Si, Item, E> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut SinkErrInto<Si, Item, E>>,
    cx: &mut Context
) -> Poll<Result<(), <SinkErrInto<Si, Item, E> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut SinkErrInto<Si, Item, E>>,
    cx: &mut Context
) -> Poll<Result<(), <SinkErrInto<Si, Item, E> as Sink<Item>>::Error>>

impl<Si, Item, U, Fut, F, E> Sink<U> for With<Si, Item, U, Fut, F> where
    E: From<<Si as Sink<Item>>::Error>,
    F: FnMut(U) -> Fut,
    Fut: Future<Output = Result<Item, E>>,
    Si: Sink<Item>, 

type Error = E

fn poll_ready(
    self: Pin<&mut With<Si, Item, U, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <With<Si, Item, U, Fut, F> as Sink<U>>::Error>>

fn start_send(
    self: Pin<&mut With<Si, Item, U, Fut, F>>,
    item: U
) -> Result<(), <With<Si, Item, U, Fut, F> as Sink<U>>::Error>

fn poll_flush(
    self: Pin<&mut With<Si, Item, U, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <With<Si, Item, U, Fut, F> as Sink<U>>::Error>>

fn poll_close(
    self: Pin<&mut With<Si, Item, U, Fut, F>>,
    cx: &mut Context
) -> Poll<Result<(), <With<Si, Item, U, Fut, F> as Sink<U>>::Error>>

impl<Si, Item, U, St, F> Sink<U> for WithFlatMap<Si, Item, U, St, F> where
    F: FnMut(U) -> St,
    Si: Sink<Item>,
    St: Stream<Item = Result<Item, <Si as Sink<Item>>::Error>>, 

type Error = <Si as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut WithFlatMap<Si, Item, U, St, F>>,
    cx: &mut Context
) -> Poll<Result<(), <WithFlatMap<Si, Item, U, St, F> as Sink<U>>::Error>>

fn start_send(
    self: Pin<&mut WithFlatMap<Si, Item, U, St, F>>,
    item: U
) -> Result<(), <WithFlatMap<Si, Item, U, St, F> as Sink<U>>::Error>

fn poll_flush(
    self: Pin<&mut WithFlatMap<Si, Item, U, St, F>>,
    cx: &mut Context
) -> Poll<Result<(), <WithFlatMap<Si, Item, U, St, F> as Sink<U>>::Error>>

fn poll_close(
    self: Pin<&mut WithFlatMap<Si, Item, U, St, F>>,
    cx: &mut Context
) -> Poll<Result<(), <WithFlatMap<Si, Item, U, St, F> as Sink<U>>::Error>>

impl<Si1, Si2, Item> Sink<Item> for Fanout<Si1, Si2> where
    Item: Clone,
    Si1: Sink<Item>,
    Si2: Sink<Item, Error = <Si1 as Sink<Item>>::Error>, 

type Error = <Si1 as Sink<Item>>::Error

fn poll_ready(
    self: Pin<&mut Fanout<Si1, Si2>>,
    cx: &mut Context
) -> Poll<Result<(), <Fanout<Si1, Si2> as Sink<Item>>::Error>>

fn start_send(
    self: Pin<&mut Fanout<Si1, Si2>>,
    item: Item
) -> Result<(), <Fanout<Si1, Si2> as Sink<Item>>::Error>

fn poll_flush(
    self: Pin<&mut Fanout<Si1, Si2>>,
    cx: &mut Context
) -> Poll<Result<(), <Fanout<Si1, Si2> as Sink<Item>>::Error>>

fn poll_close(
    self: Pin<&mut Fanout<Si1, Si2>>,
    cx: &mut Context
) -> Poll<Result<(), <Fanout<Si1, Si2> as Sink<Item>>::Error>>

impl<T> Sink<T> for Sender<T>

type Error = SendError

fn poll_ready(
    self: Pin<&mut Sender<T>>,
    cx: &mut Context
) -> Poll<Result<(), <Sender<T> as Sink<T>>::Error>>

fn start_send(
    self: Pin<&mut Sender<T>>,
    msg: T
) -> Result<(), <Sender<T> as Sink<T>>::Error>

fn poll_flush(
    self: Pin<&mut Sender<T>>,
    cx: &mut Context
) -> Poll<Result<(), <Sender<T> as Sink<T>>::Error>>

fn poll_close(
    self: Pin<&mut Sender<T>>,
    &mut Context
) -> Poll<Result<(), <Sender<T> as Sink<T>>::Error>>

impl<T> Sink<T> for UnboundedSender<T>

type Error = SendError

fn poll_ready(
    self: Pin<&mut UnboundedSender<T>>,
    cx: &mut Context
) -> Poll<Result<(), <UnboundedSender<T> as Sink<T>>::Error>>

fn start_send(
    self: Pin<&mut UnboundedSender<T>>,
    msg: T
) -> Result<(), <UnboundedSender<T> as Sink<T>>::Error>

fn poll_flush(
    self: Pin<&mut UnboundedSender<T>>,
    &mut Context
) -> Poll<Result<(), <UnboundedSender<T> as Sink<T>>::Error>>

fn poll_close(
    self: Pin<&mut UnboundedSender<T>>,
    &mut Context
) -> Poll<Result<(), <UnboundedSender<T> as Sink<T>>::Error>>

impl<T> Sink<T> for Drain<T>

type Error = Infallible

fn poll_ready(
    self: Pin<&mut Drain<T>>,
    _cx: &mut Context
) -> Poll<Result<(), <Drain<T> as Sink<T>>::Error>>

fn start_send(
    self: Pin<&mut Drain<T>>,
    _item: T
) -> Result<(), <Drain<T> as Sink<T>>::Error>

fn poll_flush(
    self: Pin<&mut Drain<T>>,
    _cx: &mut Context
) -> Poll<Result<(), <Drain<T> as Sink<T>>::Error>>

fn poll_close(
    self: Pin<&mut Drain<T>>,
    _cx: &mut Context
) -> Poll<Result<(), <Drain<T> as Sink<T>>::Error>>

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