Enum CustomLexError 

pub enum CustomLexError {
    Lex(LexError),
    Custom {
        message: String,
        payload: Option<ForeignError>,
    },
}

A TokenSource failure.

Variants

Lex(LexError)

A structured lex failure — surfaces through the parse path with the same ParseError class the built-in lexer arms produce (a custom source wrapping BasicLexer keeps UnexpectedCharacters parity, exactly as Lark’s CustomLexerNew lets the wrapped lexer’s exception escape).

Custom

An arbitrary source failure. payload is an opaque value the caller can downcast back out of ParseError::CustomLex — the identity-preserving channel a binding threads its host exception through (e.g. a stored PyErr), mirroring Lark, where the custom lexer’s exception escapes parse unwrapped.

Fields

message: String

payload: Option<ForeignError>

Implementations

impl CustomLexError

pub fn msg(message: impl Into<String>) -> Self

Message-only failure.

Trait Implementations

impl Debug for CustomLexError

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

Formats the value using the given formatter.

impl Display for CustomLexError

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

Formats the value using the given formatter.

impl Error for CustomLexError

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.