Enum StartError

#[non_exhaustive]
pub enum StartError {
    Cache {
        err: CacheError,
    },
    Quit {
        byte: u8,
    },
    UnsupportedAnchored {
        mode: Anchored,
    },
}

An error that can occur when computing the start state for a search.

Computing a start state can fail for a few reasons, either based on incorrect configuration or even based on whether the look-behind byte triggers a quit state. Typically one does not need to handle this error if you’re using DFA::start_state_forward (or its reverse counterpart), as that routine automatically converts StartError to a MatchError for you.

This error may be returned by the DFA::start_state routine.

This error implements the std::error::Error trait when the std feature is enabled.

This error is marked as non-exhaustive. New variants may be added in a semver compatible release.

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.

Cache

An error that occurs when cache inefficiency has dropped below the configured heuristic thresholds.

Fields

err: CacheError

The underlying cache error that occurred.

Quit

An error that occurs when a starting configuration’s look-behind byte is in this DFA’s quit set.

Fields

byte: u8

The quit byte that was found.

UnsupportedAnchored

An error that occurs when the caller requests an anchored mode that isn’t supported by the DFA.

Fields

mode: Anchored

The anchored mode given that is unsupported.

Trait Implementations

impl Clone for StartError

fn clone(&self) -> StartError

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for StartError

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

Formats the value using the given formatter.

impl Display for StartError

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

Formats the value using the given formatter.

impl Error for StartError

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.