Struct ForeignError 

pub struct ForeignError(pub Arc<dyn Any + Send + Sync>);

The opaque payload a ParseError::CustomLex carries out of a failed custom-lexer pull (crate::custom::CustomLexError::Custom): an owned, thread-safe Any a binding downcasts back to its host exception with identity intact (in Lark, the custom lexer’s exception escapes parse unwrapped — a stored PyErr round-trips through here). Arc keeps ParseError Clone; equality is payload identity (Arc::ptr_eq), the only equivalence an opaque value supports.

Tuple Fields

0: Arc<dyn Any + Send + Sync>

Implementations

impl ForeignError

pub fn new<T: Any + Send + Sync>(value: T) -> Self

Wrap an owned host error as an opaque payload.

pub fn downcast_ref<T: Any + Send + Sync>(&self) -> Option<&T>

Borrow the payload as T if it was created with that concrete type.

Trait Implementations

impl Clone for ForeignError

fn clone(&self) -> ForeignError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ForeignError

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

Formats the value using the given formatter.

impl Eq for ForeignError

impl PartialEq for ForeignError

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

Equality operator ==.

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

Inequality operator !=.