Enum DemandError 

pub enum DemandError {
    StaleSource,
    StaleVersion,
    StaleCursor,
    CursorBusy,
    SourceUnavailable,
    Absent,
    NotRegularFile,
    NotDirectory,
    InvalidRequest,
    Cancelled,
    WorkerUnavailable,
    Io(Error),
    Observation(NativeWatchError),
}

Typed failures from a source dependency.

Variants

StaleSource

The reference is for another source or an invalidated epoch.

StaleVersion

The node changed while a request was being answered.

StaleCursor

A directory cursor is expired or belongs to another query.

CursorBusy

Another request is currently advancing this cursor.

SourceUnavailable

Source root disappeared or was replaced.

Absent

Exact requested path is absent.

NotRegularFile

Request requires a regular file.

NotDirectory

Request requires a directory.

InvalidRequest

Bounds or path are invalid.

Cancelled

Request was cancelled.

WorkerUnavailable

The bounded native worker could not complete the request.

Io(Error)

Native or remote source failed.

Observation(NativeWatchError)

Demand-driven native observation could not be admitted exactly.

Trait Implementations

impl Debug for DemandError

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

Formats the value using the given formatter.

impl Display for DemandError

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

Formats the value using the given formatter.

impl Error for DemandError

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<DemandError> for LazyWorkspaceError

fn from(source: DemandError) -> Self

Converts to this type from the input type.

impl From<Error> for DemandError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<NamespacePathError> for DemandError

fn from(_: NamespacePathError) -> Self

Converts to this type from the input type.

impl From<NativeWatchError> for DemandError

fn from(source: NativeWatchError) -> Self

Converts to this type from the input type.