Enum FrontendError 

pub enum FrontendError {
    Configuration {
        message: String,
    },
    Grammar {
        message: String,
    },
}

A construction-time frontend/engine-configuration failure. Lives in the shared model (beside ParseError) so both the crate::frontends facade and the crate::earley engine can raise it without the engine reaching across the engine boundary into the facade layer (mirrors the sanctioned AMBIG_DATA_ID retrofit). crate::frontends re-exports it for the public surface. Carries Lark’s exception class so the conformance runner can assert both the class and the verbatim message: the postlex×dynamic and parser×lexer rejects raise ConfigurationError (FrontendError::Configuration); the dynamic×lexer_callbacks reject and the dynamic Earley zero-width/bad-regexp matcher-build reject raise GrammarError (FrontendError::Grammar).

Variants

Configuration

Lark’s ConfigurationError.

Fields

message: String

Grammar

Lark’s GrammarError.

Fields

message: String

Implementations

impl FrontendError

pub fn class_name(&self) -> &'static str

Lark’s exception class name — what the conformance runner canonicalizes to.

pub fn message(&self) -> &str

The verbatim message text (Lark’s str(exc)).

Trait Implementations

impl Clone for FrontendError

fn clone(&self) -> FrontendError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FrontendError

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

Formats the value using the given formatter.

impl Display for FrontendError

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

Formats the value using the given formatter.

impl Eq for FrontendError

impl Error for FrontendError

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 FrontendError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FrontendError