Struct futures_test::future::PendingOnce

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pub struct PendingOnce<Fut> { /* private fields */ }

Expand description

Combinator that guarantees one Poll::Pending before polling its inner future.

This is created by the FutureTestExt::pending_once method.

Trait Implementations

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impl<Fut: Clone> Clone for PendingOnce<Fut>

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fn clone(&self) -> PendingOnce<Fut>ⓘNotable traits for PendingOnce<Fut>`impl<Fut: Future> Future for PendingOnce<Fut> type Output = Fut::Output;`

Returns a copy of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl<Fut: Debug> Debug for PendingOnce<Fut>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl<Fut: FusedFuture> FusedFuture for PendingOnce<Fut>

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fn is_terminated(&self) -> bool

Returns true if the underlying future should no longer be polled.

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impl<Fut: Future> Future for PendingOnce<Fut>

type Output = Fut::Output

The type of value produced on completion.

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fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available. Read more

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impl<'pin, Fut> Unpin for PendingOnce<Fut> where
__PendingOnce<'pin, Fut>: Unpin,

Auto Trait Implementations

impl<Fut> RefUnwindSafe for PendingOnce<Fut> where
Fut: RefUnwindSafe,

impl<Fut> Send for PendingOnce<Fut> where
Fut: Send,

impl<Fut> Sync for PendingOnce<Fut> where
Fut: Sync,

impl<Fut> UnwindSafe for PendingOnce<Fut> where
Fut: UnwindSafe,

Blanket Implementations

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

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fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Output) -> U,

Map this future’s output to a different type, returning a new future of the resulting type. Read more

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fn map_into(self) -> MapInto<Self, U> where
Self::Output: Into,

Map this future’s output to a different type, returning a new future of the resulting type. Read more

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fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnOnce(Self::Output) -> Fut,
Fut: Future,

Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more

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fn left_future(self) -> Either<Self, B> where
B: Future<Output = Self::Output>,

Wrap this future in an Either future, making it the left-hand variant of that Either. Read more

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fn right_future<A>(self) -> Either<A, Self> where
A: Future<Output = Self::Output>,

Wrap this future in an Either future, making it the right-hand variant of that Either. Read more

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fn into_stream(self) -> IntoStream<Self>

Convert this future into a single element stream. Read more

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fn flatten(self) -> Flatten<Self> where
Self::Output: Future,

Flatten the execution of this future when the output of this future is itself another future. Read more

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fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream,

Flatten the execution of this future when the successful result of this future is a stream. Read more

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fn fuse(self) -> Fuse<Self>

Fuse a future such that poll will never again be called once it has completed. This method can be used to turn any Future into a FusedFuture. Read more

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fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Output),

Do something with the output of a future before passing it on. Read more

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fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,

Catches unwinding panics while polling the future. Read more

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fn shared(self) -> Shared<Self> where
Self::Output: Clone,

Create a cloneable handle to this future where all handles will resolve to the same result. Read more

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fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)

Turn this future into a future that yields () on completion and sends its output to another future on a separate task. Read more

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

Wrap the future in a Box, pinning it. Read more

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

Wrap the future in a Box, pinning it. Read more

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fn unit_error(self) -> UnitError<Self>

Turns a Future<Output = T> into a TryFuture<Ok = T, Error = ()>. Read more

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fn never_error(self) -> NeverError<Self>

Turns a Future<Output = T> into a TryFuture<Ok = T, Error = Never>. Read more

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

A convenience for calling Future::poll on Unpin future types.

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fn now_or_never(self) -> Option<Self::Output>

Evaluates and consumes the future, returning the resulting output if the future is ready after the first call to Future::poll. Read more

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impl<Fut> FutureTestExt for Fut where
Fut: Future,

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fn assert_unmoved(self) -> AssertUnmoved<Self>ⓘNotable traits for AssertUnmoved<Fut>`impl<Fut: Future> Future for AssertUnmoved<Fut> type Output = Fut::Output;` where
Self: Sized,

Asserts that the given is not moved after being polled. Read more

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fn pending_once(self) -> PendingOnce<Self>ⓘNotable traits for PendingOnce<Fut>`impl<Fut: Future> Future for PendingOnce<Fut> type Output = Fut::Output;` where
Self: Sized,

Introduces one Poll::Pending before polling the given future. Read more

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fn run_in_background(self) where
Self: Sized + Send + 'static,
Self::Output: Send,

Runs this future on a dedicated executor running in a background thread. Read more

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fn interleave_pending(self) -> InterleavePending<Self>ⓘNotable traits for InterleavePending<Fut>`impl<Fut: Future> Future for InterleavePending<Fut> type Output = Fut::Output;` where
Self: Sized,

Introduces an extra Poll::Pending in between each call to poll. Read more

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impl<T, U> Into for T where
U: From<T>,

const: unstable · source

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<F> IntoFuture for F where
F: Future,

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 IntoFuture = F

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

Which kind of future are we turning this into?

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fn into_future(self) -> <F as IntoFuture>::IntoFuture

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

Creates a future from a value.

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impl<T> ToOwned for T where
T: Clone,

type Owned = T

The resulting type after obtaining ownership.

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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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fn clone_into(&self, target: &mut T)

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

Uses borrowed data to replace owned data, usually by cloning. Read more

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impl<T, U> TryFrom for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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

type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

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

Poll this TryFuture as if it were a Future. Read more

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

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

Flattens the execution of this future when the successful result of this future is a Sink. Read more

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fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
F: FnOnce(Self::Ok) -> T,

Maps this future’s success value to a different value. Read more

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fn map_ok_or_else<T, E, F>(self, e: E, f: F) -> MapOkOrElse<Self, F, E> where
F: FnOnce(Self::Ok) -> T,
E: FnOnce(Self::Error) -> T,

Maps this future’s success value to a different value, and permits for error handling resulting in the same type. Read more

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fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
F: FnOnce(Self::Error) -> E,

Maps this future’s error value to a different value. Read more

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fn err_into<E>(self) -> ErrInto<Self, E> where
Self::Error: Into<E>,

Maps this future’s Error to a new error type using the Into trait. Read more

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fn ok_into(self) -> OkInto<Self, U> where
Self::Ok: Into,

Maps this future’s Ok to a new type using the Into trait. Read more

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fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
F: FnOnce(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,

Executes another future after this one resolves successfully. The success value is passed to a closure to create this subsequent future. Read more

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fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
F: FnOnce(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,

Executes another future if this one resolves to an error. The error value is passed to a closure to create this subsequent future. Read more

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fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where
F: FnOnce(&Self::Ok),

Do something with the success value of a future before passing it on. Read more

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fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnOnce(&Self::Error),

Do something with the error value of a future before passing it on. Read more

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fn try_flatten(self) -> TryFlatten<Self, Self::Ok> where
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,

Flatten the execution of this future when the successful result of this future is another future. Read more

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fn try_flatten_stream(self) -> TryFlattenStream<Self> where
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error == Self::Error,

Flatten the execution of this future when the successful result of this future is a stream. Read more

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fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where
F: FnOnce(Self::Error) -> Self::Ok,

Unwraps this future’s output, producing a future with this future’s Ok type as its Output type. Read more

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fn into_future(self) -> IntoFuture<Self>

Wraps a TryFuture into a type that implements Future. Read more

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

A convenience method for calling TryFuture::try_poll on Unpin future types. Read more

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Struct futures_test::future::PendingOnce

Trait Implementations

impl<Fut: Clone> Clone for PendingOnce<Fut>

fn clone(&self) -> PendingOnce<Fut>ⓘNotable traits for PendingOnce<Fut>impl<Fut: Future> Future for PendingOnce<Fut> type Output = Fut::Output;

fn clone_from(&mut self, source: &Self)

impl<Fut: Debug> Debug for PendingOnce<Fut>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

impl<Fut: FusedFuture> FusedFuture for PendingOnce<Fut>

fn is_terminated(&self) -> bool

impl<Fut: Future> Future for PendingOnce<Fut>

type Output = Fut::Output

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

impl<'pin, Fut> Unpin for PendingOnce<Fut> where __PendingOnce<'pin, Fut>: Unpin,

Auto Trait Implementations

impl<Fut> RefUnwindSafe for PendingOnce<Fut> where Fut: RefUnwindSafe,

impl<Fut> Send for PendingOnce<Fut> where Fut: Send,

impl<Fut> Sync for PendingOnce<Fut> where Fut: Sync,

impl<Fut> UnwindSafe for PendingOnce<Fut> where Fut: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

fn from(t: T) -> T

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

fn map<U, F>(self, f: F) -> Map<Self, F> where F: FnOnce(Self::Output) -> U,

fn map_into<U>(self) -> MapInto<Self, U> where Self::Output: Into<U>,

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where F: FnOnce(Self::Output) -> Fut, Fut: Future,

fn left_future<B>(self) -> Either<Self, B> where B: Future<Output = Self::Output>,

fn right_future<A>(self) -> Either<A, Self> where A: Future<Output = Self::Output>,

fn into_stream(self) -> IntoStream<Self>

fn flatten(self) -> Flatten<Self> where Self::Output: Future,

fn flatten_stream(self) -> FlattenStream<Self> where Self::Output: Stream,

fn fuse(self) -> Fuse<Self>

fn inspect<F>(self, f: F) -> Inspect<Self, F> where F: FnOnce(&Self::Output),

fn catch_unwind(self) -> CatchUnwind<Self> where Self: UnwindSafe,

fn shared(self) -> Shared<Self> where Self::Output: Clone,

fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)

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

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: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output; where Self: 'a,

fn unit_error(self) -> UnitError<Self>

fn never_error(self) -> NeverError<Self>

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

fn now_or_never(self) -> Option<Self::Output>

impl<Fut> FutureTestExt for Fut where Fut: Future,

fn assert_unmoved(self) -> AssertUnmoved<Self>ⓘNotable traits for AssertUnmoved<Fut>impl<Fut: Future> Future for AssertUnmoved<Fut> type Output = Fut::Output; where Self: Sized,

fn pending_once(self) -> PendingOnce<Self>ⓘNotable traits for PendingOnce<Fut>impl<Fut: Future> Future for PendingOnce<Fut> type Output = Fut::Output; where Self: Sized,

fn run_in_background(self) where Self: Sized + Send + 'static, Self::Output: Send,

fn interleave_pending(self) -> InterleavePending<Self>ⓘNotable traits for InterleavePending<Fut>impl<Fut: Future> Future for InterleavePending<Fut> type Output = Fut::Output; where Self: Sized,

impl<T, U> Into<U> for T where U: From<T>,

fn into(self) -> U

impl<F> IntoFuture for F where F: Future,

type Output = <F as Future>::Output

type IntoFuture = F

fn into_future(self) -> <F as IntoFuture>::IntoFuture

impl<T> ToOwned for T where T: Clone,

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

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

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

type Ok = T

type Error = E

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

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

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

fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where F: FnOnce(Self::Ok) -> T,

fn map_ok_or_else<T, E, F>(self, e: E, f: F) -> MapOkOrElse<Self, F, E> where F: FnOnce(Self::Ok) -> T, E: FnOnce(Self::Error) -> T,

fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where F: FnOnce(Self::Error) -> E,

fn err_into<E>(self) -> ErrInto<Self, E> where Self::Error: Into<E>,

fn ok_into<U>(self) -> OkInto<Self, U> where Self::Ok: Into<U>,

fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where F: FnOnce(Self::Ok) -> Fut, Fut: TryFuture<Error = Self::Error>,

fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where F: FnOnce(Self::Error) -> Fut, Fut: TryFuture<Ok = Self::Ok>,

fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where F: FnOnce(&Self::Ok),

fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where F: FnOnce(&Self::Error),

fn clone(&self) -> PendingOnce<Fut>ⓘNotable traits for PendingOnce<Fut>`impl<Fut: Future> Future for PendingOnce<Fut> type Output = Fut::Output;`

impl<'pin, Fut> Unpin for PendingOnce<Fut> where
__PendingOnce<'pin, Fut>: Unpin,

impl<Fut> RefUnwindSafe for PendingOnce<Fut> where
Fut: RefUnwindSafe,

impl<Fut> Send for PendingOnce<Fut> where
Fut: Send,

impl<Fut> Sync for PendingOnce<Fut> where
Fut: Sync,

impl<Fut> UnwindSafe for PendingOnce<Fut> where
Fut: UnwindSafe,

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

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

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

fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Output) -> U,

fn map_into<U>(self) -> MapInto<Self, U> where
Self::Output: Into<U>,

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnOnce(Self::Output) -> Fut,
Fut: Future,

fn left_future<B>(self) -> Either<Self, B> where
B: Future<Output = Self::Output>,

fn right_future<A>(self) -> Either<A, Self> where
A: Future<Output = Self::Output>,

fn flatten(self) -> Flatten<Self> where
Self::Output: Future,

fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream,

fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Output),

fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,

fn shared(self) -> Shared<Self> where
Self::Output: Clone,

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

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: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;` where
Self: 'a,

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

impl<Fut> FutureTestExt for Fut where
Fut: Future,

fn assert_unmoved(self) -> AssertUnmoved<Self>ⓘNotable traits for AssertUnmoved<Fut>`impl<Fut: Future> Future for AssertUnmoved<Fut> type Output = Fut::Output;` where
Self: Sized,

fn pending_once(self) -> PendingOnce<Self>ⓘNotable traits for PendingOnce<Fut>`impl<Fut: Future> Future for PendingOnce<Fut> type Output = Fut::Output;` where
Self: Sized,

fn run_in_background(self) where
Self: Sized + Send + 'static,
Self::Output: Send,

fn interleave_pending(self) -> InterleavePending<Self>ⓘNotable traits for InterleavePending<Fut>`impl<Fut: Future> Future for InterleavePending<Fut> type Output = Fut::Output;` where
Self: Sized,

impl<T, U> Into<U> for T where
U: From<T>,

impl<F> IntoFuture for F where
F: Future,

impl<T> ToOwned for T where
T: Clone,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

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

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

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

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

fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
F: FnOnce(Self::Ok) -> T,

fn map_ok_or_else<T, E, F>(self, e: E, f: F) -> MapOkOrElse<Self, F, E> where
F: FnOnce(Self::Ok) -> T,
E: FnOnce(Self::Error) -> T,

fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
F: FnOnce(Self::Error) -> E,

fn err_into<E>(self) -> ErrInto<Self, E> where
Self::Error: Into<E>,

fn ok_into<U>(self) -> OkInto<Self, U> where
Self::Ok: Into<U>,

fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
F: FnOnce(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,

fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
F: FnOnce(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,

fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where
F: FnOnce(&Self::Ok),

fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnOnce(&Self::Error),

fn try_flatten(self) -> TryFlatten<Self, Self::Ok> where
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,

fn try_flatten_stream(self) -> TryFlattenStream<Self> where
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error == Self::Error,

fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where
F: FnOnce(Self::Error) -> Self::Ok,

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

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,