Struct Cancelled 

pub struct Cancelled;

The background thread pool that Blocking::run was supposed to run on went away before the task got to start — for example, the runtime is shutting down while the task is still queued. No payload: this is not a failure of f (f never ran at all), but a signal from the runtime that there will be no result.

A panic in f, by contrast, does NOT become Cancelled — it is re-raised as a panic by the Blocking implementation, see the trait’s doc comment.

Trait Implementations

impl Clone for Cancelled

fn clone(&self) -> Cancelled

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Cancelled

impl Debug for Cancelled

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

Formats the value using the given formatter.

impl Display for Cancelled

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

Formats the value using the given formatter.

impl Eq for Cancelled

impl Error for Cancelled

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 PartialEq for Cancelled

fn eq(&self, other: &Cancelled) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Cancelled