Enum TaskStateError 

#[non_exhaustive]
pub enum TaskStateError {
    AlreadyExecuted(TerminalState),
    AlreadyTerminated(TerminalState),
    TaskNotFound,
}

Available on crate feature task-context only.

Errors that can occur when transitioning a TaskContext’s lifecycle state.

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.

AlreadyExecuted(TerminalState)

The task could not be cancelled because it had already reached a terminal state.

AlreadyTerminated(TerminalState)

The task could not be marked completed because it had already reached a terminal state.

TaskNotFound

Task could not be found

Trait Implementations

impl Clone for TaskStateError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TaskStateError

impl Debug for TaskStateError

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

Formats the value using the given formatter.

impl Display for TaskStateError

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

Formats the value using the given formatter.

impl Eq for TaskStateError

impl Error for TaskStateError

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<TaskStateError> for TaskLifecycleError

fn from(source: TaskStateError) -> Self

Converts to this type from the input type.

impl PartialEq for TaskStateError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TaskStateError