Enum LarkBuildError 

#[non_exhaustive]
pub enum LarkBuildError {
    Grammar {
        message: String,
    },
    Configuration {
        message: String,
    },
    Lexer(LexerBuildError),
    Load {
        message: String,
    },
    Unsupported {
        message: String,
    },
}

A construction failure — Lark’s build-time exception classes, carrying the class name + verbatim message so a binding reproduces the Python exception. Provisional richness.

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.

Grammar

Lark’s GrammarError (compile / dynamic-callback rejects).

Fields

message: String

Configuration

Lark’s ConfigurationError (parser×lexer / postlex×dynamic rejects).

Fields

message: String

Lexer(LexerBuildError)

A lexer-build validation failure (LexerBuildError).

Load

A serialized-grammar load failure (from_json_*).

Fields

message: String

Unsupported

A configured feature this RC does not implement yet (e.g. use_bytes).

Fields

message: String

Implementations

impl LarkBuildError

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

The binding-facing failure kind — what a binding selects its exception CLASS from. Lives here so a new variant is classified once, not once per binding.

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

A DISCRIMINATOR label naming the failing core variant. The WASM binding exposes it as className beside the thrown error, to tell two failures of one class apart; the Python binding does not carry it. Not a class to look up — LexerBuildError and LoadError name no binding class, by design. Select the class from Self::kind.

Trait Implementations

impl Clone for LarkBuildError

fn clone(&self) -> LarkBuildError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LarkBuildError

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

Formats the value using the given formatter.

impl Display for LarkBuildError

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

Formats the value using the given formatter.

impl Error for LarkBuildError

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.