[−][src]Struct tryhard::RetryFuture
A retryable future.
Can be created by calling retry_fn
.
Implementations
impl<MakeFutureT, FutureT, BackoffT, T, E, OnRetryT> RetryFuture<MakeFutureT, FutureT, BackoffT, OnRetryT> where
MakeFutureT: FnMut() -> FutureT,
FutureT: Future<Output = Result<T, E>>,
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MakeFutureT: FnMut() -> FutureT,
FutureT: Future<Output = Result<T, E>>,
pub fn max_delay(self, delay: Duration) -> Self
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Set the max duration to sleep between each attempt.
pub fn no_backoff(
self
) -> RetryFuture<MakeFutureT, FutureT, NoBackoff, OnRetryT>ⓘNotable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
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self
) -> RetryFuture<MakeFutureT, FutureT, NoBackoff, OnRetryT>ⓘ
Notable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
Remove the backoff strategy.
This will make the future be retried immediately without any delay in between attempts.
pub fn exponential_backoff(
self,
initial_delay: Duration
) -> RetryFuture<MakeFutureT, FutureT, ExponentialBackoff, OnRetryT>ⓘNotable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
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self,
initial_delay: Duration
) -> RetryFuture<MakeFutureT, FutureT, ExponentialBackoff, OnRetryT>ⓘ
Notable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
Use exponential backoff for retrying the future.
The first delay will be initial_delay
and afterwards the delay will double every time.
pub fn fixed_backoff(
self,
delay: Duration
) -> RetryFuture<MakeFutureT, FutureT, FixedBackoff, OnRetryT>ⓘNotable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
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self,
delay: Duration
) -> RetryFuture<MakeFutureT, FutureT, FixedBackoff, OnRetryT>ⓘ
Notable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
Use a fixed backoff for retrying the future.
The delay between attempts will always be delay
.
pub fn linear_backoff(
self,
delay: Duration
) -> RetryFuture<MakeFutureT, FutureT, LinearBackoff, OnRetryT>ⓘNotable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
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self,
delay: Duration
) -> RetryFuture<MakeFutureT, FutureT, LinearBackoff, OnRetryT>ⓘ
Notable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
Use a linear backoff for retrying the future.
The delay will be delay * attempt
so it'll scale linear with the attempt.
pub fn custom_backoff<F, R>(
self,
f: F
) -> RetryFuture<MakeFutureT, FutureT, CustomBackoffStrategy<F>, OnRetryT>ⓘNotable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
where
F: FnMut(u32, &E) -> R,
RetryPolicy: From<R>,
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self,
f: F
) -> RetryFuture<MakeFutureT, FutureT, CustomBackoffStrategy<F>, OnRetryT>ⓘ
Notable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
F: FnMut(u32, &E) -> R,
RetryPolicy: From<R>,
Use a custom backoff specified by some function.
use std::time::Duration; tryhard::retry_fn(|| read_file("Cargo.toml")) .retries(10) .custom_backoff(|attempt, _error| { if attempt < 5 { Duration::from_millis(100) } else { Duration::from_millis(500) } }) .await?;
You can also stop retrying early:
use std::time::Duration; use tryhard::RetryPolicy; tryhard::retry_fn(|| read_file("Cargo.toml")) .retries(10) .custom_backoff(|attempt, error| { if error.to_string().contains("foobar") { // returning this will cancel the loop and // return the most recent error RetryPolicy::Break } else { RetryPolicy::Delay(Duration::from_millis(50)) } }) .await?;
pub fn on_retry<F, OnRetryFuture>(
self,
f: F
) -> RetryFuture<MakeFutureT, FutureT, BackoffT, F>ⓘNotable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
where
F: FnMut(u32, Option<Duration>, &E) -> OnRetryFuture,
OnRetryFuture: Future + Send + 'static,
OnRetryFuture::Output: Send + 'static,
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self,
f: F
) -> RetryFuture<MakeFutureT, FutureT, BackoffT, F>ⓘ
Notable traits for RetryFuture<F, Fut, B, OnRetryT>
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>, type Output = Result<T, E>;
F: FnMut(u32, Option<Duration>, &E) -> OnRetryFuture,
OnRetryFuture: Future + Send + 'static,
OnRetryFuture::Output: Send + 'static,
Some async computation that will be spawned before each retry.
This can for example be used for telemtry such as logging or other kinds of tracking.
The future returned will be given to tokio::spawn
so wont impact the actual retrying.
Example
For example to print and gather all the errors you can do:
use std::sync::Arc; #[cfg(feature = "tokio-03")] use tokio_03 as tokio; #[cfg(feature = "tokio-02")] use tokio_02 as tokio; use tokio::sync::Mutex; let all_errors = Arc::new(Mutex::new(Vec::new())); tryhard::retry_fn(|| async { // just some dummy computation that always fails Err::<(), _>("fail") }) .retries(10) .on_retry(|_attempt, _next_delay, error| { // the future must be `'static` so it cannot contain references let all_errors = Arc::clone(&all_errors); let error = error.clone(); async move { eprintln!("Something failed: {}", error); all_errors.lock().await.push(error); } }) .await .unwrap_err(); assert_eq!(all_errors.lock().await.len(), 10);
Trait Implementations
impl<F, Fut, B, T, E, OnRetryT> Future for RetryFuture<F, Fut, B, OnRetryT> where
F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>,
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F: FnMut() -> Fut,
Fut: Future<Output = Result<T, E>>,
E: Display,
B: BackoffStrategy<E>,
RetryPolicy: From<B::Output>,
OnRetryT: OnRetry<E>,
type Output = Result<T, E>
The type of value produced on completion.
pub fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>
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impl<'pin, MakeFutureT, FutureT, BackoffT, OnRetryT> Unpin for RetryFuture<MakeFutureT, FutureT, BackoffT, OnRetryT> where
__RetryFuture<'pin, MakeFutureT, FutureT, BackoffT, OnRetryT>: Unpin,
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__RetryFuture<'pin, MakeFutureT, FutureT, BackoffT, OnRetryT>: Unpin,
Auto Trait Implementations
impl<MakeFutureT, FutureT, BackoffT, OnRetryT> !RefUnwindSafe for RetryFuture<MakeFutureT, FutureT, BackoffT, OnRetryT>
impl<MakeFutureT, FutureT, BackoffT, OnRetryT> Send for RetryFuture<MakeFutureT, FutureT, BackoffT, OnRetryT> where
BackoffT: Send,
FutureT: Send,
MakeFutureT: Send,
OnRetryT: Send,
BackoffT: Send,
FutureT: Send,
MakeFutureT: Send,
OnRetryT: Send,
impl<MakeFutureT, FutureT, BackoffT, OnRetryT> Sync for RetryFuture<MakeFutureT, FutureT, BackoffT, OnRetryT> where
BackoffT: Sync,
FutureT: Sync,
MakeFutureT: Sync,
OnRetryT: Sync,
BackoffT: Sync,
FutureT: Sync,
MakeFutureT: Sync,
OnRetryT: Sync,
impl<MakeFutureT, FutureT, BackoffT, OnRetryT> !UnwindSafe for RetryFuture<MakeFutureT, FutureT, BackoffT, OnRetryT>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T> FutureExt for T where
T: Future + ?Sized,
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T: Future + ?Sized,
pub fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Output) -> U,
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F: FnOnce(Self::Output) -> U,
pub fn map_into<U>(self) -> MapInto<Self, U> where
Self::Output: Into<U>,
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Self::Output: Into<U>,
pub fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnOnce(Self::Output) -> Fut,
Fut: Future,
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F: FnOnce(Self::Output) -> Fut,
Fut: Future,
pub fn left_future<B>(self) -> Either<Self, B> where
B: Future<Output = Self::Output>,
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B: Future<Output = Self::Output>,
pub fn right_future<A>(self) -> Either<A, Self> where
A: Future<Output = Self::Output>,
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A: Future<Output = Self::Output>,
pub fn into_stream(self) -> IntoStream<Self>
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pub fn flatten(self) -> Flatten<Self> where
Self::Output: Future,
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Self::Output: Future,
pub fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream,
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Self::Output: Stream,
pub fn fuse(self) -> Fuse<Self>
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pub fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Output),
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F: FnOnce(&Self::Output),
pub fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,
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Self: UnwindSafe,
pub fn shared(self) -> Shared<Self> where
Self::Output: Clone,
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Self::Output: Clone,
pub fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)
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pub fn boxed<'a>(
self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>> where
Self: Send + 'a,
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self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>> where
Self: Send + 'a,
pub fn boxed_local<'a>(
self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>> where
Self: 'a,
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self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>> where
Self: 'a,
pub fn unit_error(self) -> UnitError<Self>
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pub fn never_error(self) -> NeverError<Self>
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pub fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output> where
Self: Unpin,
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Self: Unpin,
pub fn now_or_never(self) -> Option<Self::Output>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<F> IntoFuture for F where
F: Future,
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F: Future,
type Output = <F as Future>::Output
into_future
)The output that the future will produce on completion.
type Future = F
into_future
)Which kind of future are we turning this into?
pub fn into_future(self) -> <F as IntoFuture>::Future
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<F, T, E> TryFuture for F where
F: Future<Output = Result<T, E>> + ?Sized,
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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
pub fn try_poll(
self: Pin<&mut F>,
cx: &mut Context<'_>
) -> Poll<<F as Future>::Output>
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self: Pin<&mut F>,
cx: &mut Context<'_>
) -> Poll<<F as Future>::Output>
impl<Fut> TryFutureExt for Fut where
Fut: TryFuture + ?Sized,
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Fut: TryFuture + ?Sized,
pub fn flatten_sink<Item>(self) -> FlattenSink<Self, Self::Ok> where
Self::Ok: Sink<Item>,
<Self::Ok as Sink<Item>>::Error == Self::Error,
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Self::Ok: Sink<Item>,
<Self::Ok as Sink<Item>>::Error == Self::Error,
pub fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
F: FnOnce(Self::Ok) -> T,
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F: FnOnce(Self::Ok) -> T,
pub fn map_ok_or_else<T, E, F>(self, e: E, f: F) -> MapOkOrElse<Self, F, E> where
E: FnOnce(Self::Error) -> T,
F: FnOnce(Self::Ok) -> T,
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E: FnOnce(Self::Error) -> T,
F: FnOnce(Self::Ok) -> T,
pub fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
F: FnOnce(Self::Error) -> E,
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F: FnOnce(Self::Error) -> E,
pub fn err_into<E>(self) -> ErrInto<Self, E> where
Self::Error: Into<E>,
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Self::Error: Into<E>,
pub fn ok_into<U>(self) -> OkInto<Self, U> where
Self::Ok: Into<U>,
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Self::Ok: Into<U>,
pub fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
F: FnOnce(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,
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F: FnOnce(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,
pub fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
F: FnOnce(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,
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F: FnOnce(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,
pub fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where
F: FnOnce(&Self::Ok),
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F: FnOnce(&Self::Ok),
pub fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnOnce(&Self::Error),
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F: FnOnce(&Self::Error),
pub fn try_flatten(self) -> TryFlatten<Self, Self::Ok> where
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,
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Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,
pub fn try_flatten_stream(self) -> TryFlattenStream<Self> where
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error == Self::Error,
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Self::Ok: TryStream,
<Self::Ok as TryStream>::Error == Self::Error,
pub fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where
F: FnOnce(Self::Error) -> Self::Ok,
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F: FnOnce(Self::Error) -> Self::Ok,
pub fn into_future(self) -> IntoFuture<Self>
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pub fn try_poll_unpin(
&mut self,
cx: &mut Context<'_>
) -> Poll<Result<Self::Ok, Self::Error>> where
Self: Unpin,
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&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>,
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U: TryFrom<T>,