Enum TaskFailure 

#[non_exhaustive]
pub enum TaskFailure {
    Aborted,
    Error(Arc<dyn Error + Send + Sync + 'static>),
    Panic(Arc<str>),
    Timeout,
}

The cause of a task failure: the underlying task ended without producing a rejection value, e.g. it panicked or was cancelled.

Passed to PromiseRejection::task_failed so the rejection type can represent the failure.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Aborted

The task was aborted, either through an AbortHandle or by external cancellation of the underlying task, such as a tokio runtime shutdown.

Error(Arc<dyn Error + Send + Sync + 'static>)

The task failed with an error, such as when every resolver handle was dropped.

Panic(Arc<str>)

The task panicked. Carries the panic message.

Timeout

A Promise::timeout deadline elapsed.

Trait Implementations

impl Clone for TaskFailure

fn clone(&self) -> TaskFailure

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TaskFailure

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

Formats the value using the given formatter.

impl Display for TaskFailure

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

Formats the value using the given formatter.

impl Error for TaskFailure

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

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

Provides type-based access to context intended for error reports.

impl From<Box<dyn Any + Send>> for TaskFailure

fn from(payload: Box<dyn Any + Send + 'static>) -> Self

Converts to this type from the input type.

impl From<Box<dyn Error + Sync + Send>> for TaskFailure

fn from(err: Box<dyn Error + Send + Sync + 'static>) -> Self

Converts to this type from the input type.

impl From<JoinError> for TaskFailure

Available on crate feature tokio only.

fn from(err: JoinError) -> Self

Converts to this type from the input type.

impl<T, E> From<TaskFailure> for Promise<T, E>

fn from(failure: TaskFailure) -> Self

Converts a TaskFailure into a failed promise.

The failure is stored as is and mapped through PromiseRejection::task_failed on every consumption.