[−][src]Struct futures::stream::Forward

#[must_use =
  "futures/streams/sinks do nothing unless you `.await` or poll them"]pub struct Forward<St, Si> where
    St: TryStream,  { /* fields omitted */ }

Future for the forward method.

Trait Implementations

`impl<St, Si> Debug for Forward<St, Si> where St: TryStream, Forward<St, Si, <St as TryStream>::Ok>: Debug,` [src]

`pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>`[src]

`impl<St, Si> FusedFuture for Forward<St, Si> where St: TryStream, Forward<St, Si, <St as TryStream>::Ok>: FusedFuture,` [src]

`pub fn is_terminated(&self) -> bool`[src]

`impl<St, Si> Future for Forward<St, Si> where St: TryStream, Forward<St, Si, <St as TryStream>::Ok>: Future,` [src]

`type Output = <Forward<St, Si, <St as TryStream>::Ok> as Future>::Output`

The type of value produced on completion.

`pub fn poll( self: Pin<&mut Forward<St, Si>>, cx: &mut Context<'_> ) -> Poll<<Forward<St, Si> as Future>::Output>`[src]

`impl<'pin, St, Si> Unpin for Forward<St, Si> where St: TryStream, Origin<'__pin, St, Si>: Unpin,` [src]

Auto Trait Implementations

`impl<St, Si> RefUnwindSafe for Forward<St, Si> where Si: RefUnwindSafe, St: RefUnwindSafe, <St as TryStream>::Ok: RefUnwindSafe,` [src]

`impl<St, Si> Send for Forward<St, Si> where Si: Send, St: Send, <St as TryStream>::Ok: Send,` [src]

`impl<St, Si> Sync for Forward<St, Si> where Si: Sync, St: Sync, <St as TryStream>::Ok: Sync,` [src]

`impl<St, Si> UnwindSafe for Forward<St, Si> where Si: UnwindSafe, St: UnwindSafe, <St as TryStream>::Ok: UnwindSafe,` [src]

Blanket Implementations

`impl<T> Any for T where T: 'static + ?Sized,` [src]

`pub fn type_id(&self) -> TypeId`[src]

`impl<T> Borrow<T> for T where T: ?Sized,` [src]

`pub fn borrow(&self) -> &TⓘNotable traits for &'_ mut F impl<'_, F> Future for &'_ mut F where F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;`[src]

`impl<T> BorrowMut<T> for T where T: ?Sized,` [src]

`pub fn borrow_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut F impl<'_, F> Future for &'_ mut F where F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;`[src]

`impl<T> From<T> for T`[src]

`pub fn from(t: T) -> T`[src]

`impl<T> FutureExt for T where T: Future + ?Sized,` [src]

`pub fn map<U, F>(self, f: F) -> Map<Self, F>ⓘNotable traits for Map<Fut, F> impl<Fut, F> Future for Map<Fut, F> where Map<Fut, F>: Future, type Output = <Map<Fut, F> as Future>::Output; where F: FnOnce(Self::Output) -> U,` [src]

`pub fn map_into(self) -> MapInto<Self, U>ⓘNotable traits for MapInto<Fut, T> impl<Fut, T> Future for MapInto<Fut, T> where Map<Fut, IntoFn<T>>: Future, type Output = <Map<Fut, IntoFn<T>> as Future>::Output; where Self::Output: Into,` [src]

`pub fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>ⓘNotable traits for Then<Fut1, Fut2, F> impl<Fut1, Fut2, F> Future for Then<Fut1, Fut2, F> where Flatten<Map<Fut1, F>, Fut2>: Future, type Output = <Flatten<Map<Fut1, F>, Fut2> as Future>::Output; where F: FnOnce(Self::Output) -> Fut, Fut: Future,` [src]

`pub fn left_future(self) -> Either<Self, B>ⓘNotable traits for Either<A, B> impl<A, B> Future for Either<A, B> where B: Future<Output = <A as Future>::Output>, A: Future, type Output = <A as Future>::Output; where B: Future<Output = Self::Output>,` [src]

`pub fn right_future<A>(self) -> Either<A, Self>ⓘNotable traits for Either<A, B> impl<A, B> Future for Either<A, B> where B: Future<Output = <A as Future>::Output>, A: Future, type Output = <A as Future>::Output; where A: Future<Output = Self::Output>,` [src]

`pub fn into_stream(self) -> IntoStream<Self>`[src]

`pub fn flatten(self) -> Flatten<Self>ⓘNotable traits for Flatten<F> impl<F> Future for Flatten<F> where F: Future, Flatten<F, <F as Future>::Output>: Future, type Output = <Flatten<F, <F as Future>::Output> as Future>::Output; where Self::Output: Future,` [src]

`pub fn flatten_stream(self) -> FlattenStream<Self> where Self::Output: Stream,` [src]

`pub fn fuse(self) -> Fuse<Self>ⓘNotable traits for Fuse<Fut> impl<Fut> Future for Fuse<Fut> where Fut: Future, type Output = <Fut as Future>::Output;`[src]

`pub fn inspect<F>(self, f: F) -> Inspect<Self, F>ⓘNotable traits for Inspect<Fut, F> impl<Fut, F> Future for Inspect<Fut, F> where Map<Fut, InspectFn<F>>: Future, type Output = <Map<Fut, InspectFn<F>> as Future>::Output; where F: FnOnce(&Self::Output),` [src]

`pub fn catch_unwind(self) -> CatchUnwind<Self>ⓘNotable traits for CatchUnwind<Fut> impl<Fut> Future for CatchUnwind<Fut> where Fut: Future + UnwindSafe, type Output = Result<<Fut as Future>::Output, Box<dyn Any + 'static + Send, Global>>; where Self: UnwindSafe,` [src]

`pub fn shared(self) -> Shared<Self>ⓘNotable traits for Shared<Fut> impl<Fut> Future for Shared<Fut> where Fut: Future, <Fut as Future>::Output: Clone, type Output = <Fut as Future>::Output; where Self::Output: Clone,` [src]

`pub fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)`[src]

`pub fn boxed<'a>( self ) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>>ⓘNotable traits for Pin impl Future for Pin where P: Unpin + DerefMut, ::Target: Future, type Output = <::Target as Future>::Output; where Self: Send + 'a,` [src]

`pub fn boxed_local<'a>( self ) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>>ⓘNotable traits for Pin impl Future for Pin where P: Unpin + DerefMut, ::Target: Future, type Output = <::Target as Future>::Output; where Self: 'a,` [src]

`pub fn unit_error(self) -> UnitError<Self>ⓘNotable traits for UnitError<Fut> impl<Fut> Future for UnitError<Fut> where Map<Fut, OkFn<()>>: Future, type Output = <Map<Fut, OkFn<()>> as Future>::Output;`[src]

`pub fn never_error(self) -> NeverError<Self>ⓘNotable traits for NeverError<Fut> impl<Fut> Future for NeverError<Fut> where Map<Fut, OkFn<Infallible>>: Future, type Output = <Map<Fut, OkFn<Infallible>> as Future>::Output;`[src]

`pub fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output> where Self: Unpin,` [src]

`pub fn now_or_never(self) -> Option<Self::Output>`[src]

`impl<T, U> Into for T where U: From<T>,` [src]

`pub fn into(self) -> U`[src]

`impl<F> IntoFuture for F where F: Future,` [src]

`type Output = <F as Future>::Output`

🔬 This is a nightly-only experimental API. (into_future)

The output that the future will produce on completion.

`type Future = F`

🔬 This is a nightly-only experimental API. (into_future)

Which kind of future are we turning this into?

`pub fn into_future(self) -> <F as IntoFuture>::Future`[src]

`impl<T, U> TryFrom for T where U: Into<T>,` [src]

`type Error = Infallible`

The type returned in the event of a conversion error.

`pub fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>`[src]

`impl<F, T, E> TryFuture for F where F: Future<Output = Result<T, E>> + ?Sized,` [src]

`type Ok = T`

The type of successful values yielded by this future

`type Error = E`

The type of failures yielded by this future

`pub fn try_poll( self: Pin<&mut F>, cx: &mut Context<'_> ) -> Poll<<F as Future>::Output>`[src]

`impl<Fut> TryFutureExt for Fut where Fut: TryFuture + ?Sized,` [src]

`pub fn flatten_sink<Item>(self) -> FlattenSink<Self, Self::Ok> where Self::Ok: Sink<Item>, <Self::Ok as Sink<Item>>::Error == Self::Error,` [src]

`pub fn map_ok<T, F>(self, f: F) -> MapOk<Self, F>ⓘNotable traits for MapOk<Fut, F> impl<Fut, F> Future for MapOk<Fut, F> where Map<IntoFuture<Fut>, MapOkFn<F>>: Future, type Output = <Map<IntoFuture<Fut>, MapOkFn<F>> as Future>::Output; where F: FnOnce(Self::Ok) -> T,` [src]

`pub fn map_ok_or_else<T, E, F>(self, e: E, f: F) -> MapOkOrElse<Self, F, E>ⓘNotable traits for MapOkOrElse<Fut, F, G> impl<Fut, F, G> Future for MapOkOrElse<Fut, F, G> where Map<IntoFuture<Fut>, ChainFn<MapOkFn<F>, ChainFn<MapErrFn<G>, MergeResultFn>>>: Future, type Output = <Map<IntoFuture<Fut>, ChainFn<MapOkFn<F>, ChainFn<MapErrFn<G>, MergeResultFn>>> as Future>::Output; where E: FnOnce(Self::Error) -> T, F: FnOnce(Self::Ok) -> T,` [src]

`pub fn map_err<E, F>(self, f: F) -> MapErr<Self, F>ⓘNotable traits for MapErr<Fut, F> impl<Fut, F> Future for MapErr<Fut, F> where Map<IntoFuture<Fut>, MapErrFn<F>>: Future, type Output = <Map<IntoFuture<Fut>, MapErrFn<F>> as Future>::Output; where F: FnOnce(Self::Error) -> E,` [src]

`pub fn err_into<E>(self) -> ErrInto<Self, E>ⓘNotable traits for ErrInto<Fut, E> impl<Fut, E> Future for ErrInto<Fut, E> where MapErr<Fut, IntoFn<E>>: Future, type Output = <MapErr<Fut, IntoFn<E>> as Future>::Output; where Self::Error: Into<E>,` [src]

`pub fn ok_into(self) -> OkInto<Self, U>ⓘNotable traits for OkInto<Fut, E> impl<Fut, E> Future for OkInto<Fut, E> where MapOk<Fut, IntoFn<E>>: Future, type Output = <MapOk<Fut, IntoFn<E>> as Future>::Output; where Self::Ok: Into,` [src]

`pub fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F>ⓘNotable traits for AndThen<Fut1, Fut2, F> impl<Fut1, Fut2, F> Future for AndThen<Fut1, Fut2, F> where TryFlatten<MapOk<Fut1, F>, Fut2>: Future, type Output = <TryFlatten<MapOk<Fut1, F>, Fut2> as Future>::Output; where F: FnOnce(Self::Ok) -> Fut, Fut: TryFuture<Error = Self::Error>,` [src]

`pub fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F>ⓘNotable traits for OrElse<Fut1, Fut2, F> impl<Fut1, Fut2, F> Future for OrElse<Fut1, Fut2, F> where TryFlattenErr<MapErr<Fut1, F>, Fut2>: Future, type Output = <TryFlattenErr<MapErr<Fut1, F>, Fut2> as Future>::Output; where F: FnOnce(Self::Error) -> Fut, Fut: TryFuture<Ok = Self::Ok>,` [src]

`pub fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F>ⓘNotable traits for InspectOk<Fut, F> impl<Fut, F> Future for InspectOk<Fut, F> where Inspect<IntoFuture<Fut>, InspectOkFn<F>>: Future, type Output = <Inspect<IntoFuture<Fut>, InspectOkFn<F>> as Future>::Output; where F: FnOnce(&Self::Ok),` [src]

`pub fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>ⓘNotable traits for InspectErr<Fut, F> impl<Fut, F> Future for InspectErr<Fut, F> where Inspect<IntoFuture<Fut>, InspectErrFn<F>>: Future, type Output = <Inspect<IntoFuture<Fut>, InspectErrFn<F>> as Future>::Output; where F: FnOnce(&Self::Error),` [src]

`pub fn try_flatten(self) -> TryFlatten<Self, Self::Ok>ⓘNotable traits for TryFlatten<Fut1, Fut2> impl<Fut1, Fut2> Future for TryFlatten<Fut1, Fut2> where TryFlatten<Fut1, Fut2>: Future, type Output = <TryFlatten<Fut1, Fut2> as Future>::Output; where Self::Ok: TryFuture, <Self::Ok as TryFuture>::Error == Self::Error,` [src]

`pub fn try_flatten_stream(self) -> TryFlattenStream<Self> where Self::Ok: TryStream, <Self::Ok as TryStream>::Error == Self::Error,` [src]

`pub fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F>ⓘNotable traits for UnwrapOrElse<Fut, F> impl<Fut, F> Future for UnwrapOrElse<Fut, F> where Map<IntoFuture<Fut>, UnwrapOrElseFn<F>>: Future, type Output = <Map<IntoFuture<Fut>, UnwrapOrElseFn<F>> as Future>::Output; where F: FnOnce(Self::Error) -> Self::Ok,` [src]

`pub fn compat(self) -> Compat<Self>ⓘNotable traits for Compat<R> impl<R> Read for Compat<R> where R: Unpin + AsyncRead, impl<W> Write for Compat<W> where W: Unpin + AsyncWrite, where Self: Unpin,` [src]

`pub fn into_future(self) -> IntoFuture<Self>ⓘNotable traits for IntoFuture<Fut> impl<Fut> Future for IntoFuture<Fut> where Fut: TryFuture, type Output = Result<<Fut as TryFuture>::Ok, <Fut as TryFuture>::Error>;`[src]

`pub fn try_poll_unpin( &mut self, cx: &mut Context<'_> ) -> Poll<Result<Self::Ok, Self::Error>> where Self: Unpin,` [src]

`impl<T, U> TryInto for T where U: TryFrom<T>,` [src]

`type Error = >::Error`

The type returned in the event of a conversion error.

`pub fn try_into(self) -> Result<U, >::Error>`[src]

[−][src]Struct futures::stream::Forward

Trait Implementations

impl<St, Si> Debug for Forward<St, Si> where St: TryStream, Forward<St, Si, <St as TryStream>::Ok>: Debug, [src]

pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>[src]

impl<St, Si> FusedFuture for Forward<St, Si> where St: TryStream, Forward<St, Si, <St as TryStream>::Ok>: FusedFuture, [src]

pub fn is_terminated(&self) -> bool[src]

impl<St, Si> Future for Forward<St, Si> where St: TryStream, Forward<St, Si, <St as TryStream>::Ok>: Future, [src]

type Output = <Forward<St, Si, <St as TryStream>::Ok> as Future>::Output

pub fn poll( self: Pin<&mut Forward<St, Si>>, cx: &mut Context<'_>) -> Poll<<Forward<St, Si> as Future>::Output>[src]

impl<'__pin, St, Si> Unpin for Forward<St, Si> where St: TryStream, __Origin<'__pin, St, Si>: Unpin, [src]

Auto Trait Implementations

impl<St, Si> RefUnwindSafe for Forward<St, Si> where Si: RefUnwindSafe, St: RefUnwindSafe, <St as TryStream>::Ok: RefUnwindSafe, [src]

impl<St, Si> Send for Forward<St, Si> where Si: Send, St: Send, <St as TryStream>::Ok: Send, [src]

impl<St, Si> Sync for Forward<St, Si> where Si: Sync, St: Sync, <St as TryStream>::Ok: Sync, [src]

impl<St, Si> UnwindSafe for Forward<St, Si> where Si: UnwindSafe, St: UnwindSafe, <St as TryStream>::Ok: UnwindSafe, [src]

Blanket Implementations

impl<T> Any for T where T: 'static + ?Sized, [src]

pub fn type_id(&self) -> TypeId[src]

impl<T> Borrow<T> for T where T: ?Sized, [src]

pub fn borrow(&self) -> &TⓘNotable traits for &'_ mut Fimpl<'_, F> Future for &'_ mut F where F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;[src]

Notable traits for &'_ mut F

impl<T> BorrowMut<T> for T where T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut Fimpl<'_, F> Future for &'_ mut F where F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;[src]

Notable traits for &'_ mut F

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

impl<T> FutureExt for T where T: Future + ?Sized, [src]

pub fn map<U, F>(self, f: F) -> Map<Self, F>ⓘNotable traits for Map<Fut, F>impl<Fut, F> Future for Map<Fut, F> where Map<Fut, F>: Future, type Output = <Map<Fut, F> as Future>::Output; where F: FnOnce(Self::Output) -> U, [src]

Notable traits for Map<Fut, F>

pub fn map_into<U>(self) -> MapInto<Self, U>ⓘNotable traits for MapInto<Fut, T>impl<Fut, T> Future for MapInto<Fut, T> where Map<Fut, IntoFn<T>>: Future, type Output = <Map<Fut, IntoFn<T>> as Future>::Output; where Self::Output: Into<U>, [src]

Notable traits for MapInto<Fut, T>

Notable traits for Then<Fut1, Fut2, F>

pub fn left_future<B>(self) -> Either<Self, B>ⓘNotable traits for Either<A, B>impl<A, B> Future for Either<A, B> where B: Future<Output = <A as Future>::Output>, A: Future, type Output = <A as Future>::Output; where B: Future<Output = Self::Output>, [src]

Notable traits for Either<A, B>

pub fn right_future<A>(self) -> Either<A, Self>ⓘNotable traits for Either<A, B>impl<A, B> Future for Either<A, B> where B: Future<Output = <A as Future>::Output>, A: Future, type Output = <A as Future>::Output; where A: Future<Output = Self::Output>, [src]

Notable traits for Either<A, B>

pub fn into_stream(self) -> IntoStream<Self>[src]

pub fn flatten(self) -> Flatten<Self>ⓘNotable traits for Flatten<F>impl<F> Future for Flatten<F> where F: Future, Flatten<F, <F as Future>::Output>: Future, type Output = <Flatten<F, <F as Future>::Output> as Future>::Output; where Self::Output: Future, [src]

Notable traits for Flatten<F>

pub fn flatten_stream(self) -> FlattenStream<Self> where Self::Output: Stream, [src]

pub fn fuse(self) -> Fuse<Self>ⓘNotable traits for Fuse<Fut>impl<Fut> Future for Fuse<Fut> where Fut: Future, type Output = <Fut as Future>::Output;[src]

Notable traits for Fuse<Fut>

pub fn inspect<F>(self, f: F) -> Inspect<Self, F>ⓘNotable traits for Inspect<Fut, F>impl<Fut, F> Future for Inspect<Fut, F> where Map<Fut, InspectFn<F>>: Future, type Output = <Map<Fut, InspectFn<F>> as Future>::Output; where F: FnOnce(&Self::Output), [src]

Notable traits for Inspect<Fut, F>

pub fn catch_unwind(self) -> CatchUnwind<Self>ⓘNotable traits for CatchUnwind<Fut>impl<Fut> Future for CatchUnwind<Fut> where Fut: Future + UnwindSafe, type Output = Result<<Fut as Future>::Output, Box<dyn Any + 'static + Send, Global>>; where Self: UnwindSafe, [src]

Notable traits for CatchUnwind<Fut>

pub fn shared(self) -> Shared<Self>ⓘNotable traits for Shared<Fut>impl<Fut> Future for Shared<Fut> where Fut: Future, <Fut as Future>::Output: Clone, type Output = <Fut as Future>::Output; where Self::Output: Clone, [src]

Notable traits for Shared<Fut>

pub fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)[src]

pub fn boxed<'a>( self) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>>ⓘNotable traits for Pin<P>impl<P> Future for Pin<P> where P: Unpin + DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output; where Self: Send + 'a, [src]

Notable traits for Pin<P>

pub fn boxed_local<'a>( self) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>>ⓘNotable traits for Pin<P>impl<P> Future for Pin<P> where P: Unpin + DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output; where Self: 'a, [src]

Notable traits for Pin<P>

pub fn unit_error(self) -> UnitError<Self>ⓘNotable traits for UnitError<Fut>impl<Fut> Future for UnitError<Fut> where Map<Fut, OkFn<()>>: Future, type Output = <Map<Fut, OkFn<()>> as Future>::Output;[src]

Notable traits for UnitError<Fut>

pub fn never_error(self) -> NeverError<Self>ⓘNotable traits for NeverError<Fut>impl<Fut> Future for NeverError<Fut> where Map<Fut, OkFn<Infallible>>: Future, type Output = <Map<Fut, OkFn<Infallible>> as Future>::Output;[src]

Notable traits for NeverError<Fut>

pub fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output> where Self: Unpin, [src]

pub fn now_or_never(self) -> Option<Self::Output>[src]

impl<T, U> Into<U> for T where U: From<T>, [src]

pub fn into(self) -> U[src]

impl<F> IntoFuture for F where F: Future, [src]

type Output = <F as Future>::Output

type Future = F

pub fn into_future(self) -> <F as IntoFuture>::Future[src]

impl<T, U> TryFrom<U> for T where U: Into<T>, [src]

type Error = Infallible

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

impl<F, T, E> TryFuture for F where F: Future<Output = Result<T, E>> + ?Sized, [src]

type Ok = T

type Error = E

pub fn try_poll( self: Pin<&mut F>, cx: &mut Context<'_>) -> Poll<<F as Future>::Output>[src]

impl<Fut> TryFutureExt for Fut where Fut: TryFuture + ?Sized, [src]

pub fn flatten_sink<Item>(self) -> FlattenSink<Self, Self::Ok> where Self::Ok: Sink<Item>, <Self::Ok as Sink<Item>>::Error == Self::Error, [src]

pub fn map_ok<T, F>(self, f: F) -> MapOk<Self, F>ⓘNotable traits for MapOk<Fut, F>impl<Fut, F> Future for MapOk<Fut, F> where Map<IntoFuture<Fut>, MapOkFn<F>>: Future, type Output = <Map<IntoFuture<Fut>, MapOkFn<F>> as Future>::Output; where F: FnOnce(Self::Ok) -> T, [src]

Notable traits for MapOk<Fut, F>

Notable traits for MapOkOrElse<Fut, F, G>

pub fn map_err<E, F>(self, f: F) -> MapErr<Self, F>ⓘNotable traits for MapErr<Fut, F>impl<Fut, F> Future for MapErr<Fut, F> where Map<IntoFuture<Fut>, MapErrFn<F>>: Future, type Output = <Map<IntoFuture<Fut>, MapErrFn<F>> as Future>::Output; where F: FnOnce(Self::Error) -> E, [src]

Notable traits for MapErr<Fut, F>

pub fn err_into<E>(self) -> ErrInto<Self, E>ⓘNotable traits for ErrInto<Fut, E>impl<Fut, E> Future for ErrInto<Fut, E> where MapErr<Fut, IntoFn<E>>: Future, type Output = <MapErr<Fut, IntoFn<E>> as Future>::Output; where Self::Error: Into<E>, [src]