Struct LuaError 

pub struct LuaError(pub Value);

A Lua error: an arbitrary Lua value (almost always a string) plus classification metadata recorded on the Vm side.

LuaError itself is Copy (16 bytes) — embedders matching on the error value do so via e.0. Richer error context (kind, source, traceback) lives on the Vm and is accessed through:

• Vm::error_text — formatted message
• Vm::error_kind — LuaErrorKind classification
• Vm::error_source — (source_name, line) of the most recent error
• Vm::take_error_traceback — formatted traceback

use luna_core::vm::{Vm, LuaError, LuaErrorKind};
use luna_core::version::LuaVersion;

let mut vm = Vm::sandbox(LuaVersion::Lua55).open_base().build();
let err: LuaError = vm.eval("syntax error here").unwrap_err();
// The error value is a string (PUC convention):
assert!(err.0.try_as_str().is_some());
// Vm-side metadata records the classification:
assert_eq!(vm.error_kind(), LuaErrorKind::Syntax);

Tuple Fields

0: Value

Implementations

impl LuaError

pub fn nil() -> LuaError

Construct a LuaError carrying Value::Nil (the cheap default for trait conversions that don’t have a &mut Vm to intern a rich message with). Callers with a Vm typically use LuaError::message.

pub fn new(v: Value) -> LuaError

Construct a LuaError from a Value directly.

Trait Implementations

impl Clone for LuaError

fn clone(&self) -> LuaError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LuaError

impl Debug for LuaError

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

Formats the value using the given formatter.

impl Display for LuaError

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

Formats the value using the given formatter.

impl Error for LuaError

fn source(&self) -> Option<&(dyn Error + 'static)>

Lua errors do not carry a chained Rust-side source — the causal chain (__index failure → metamethod error → top-level failure) is captured in the traceback accessible via Vm::take_error_traceback.

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 From<LuaError> for Error

fn from(e: LuaError) -> Error

Converts to this type from the input type.

impl From<TableError> for LuaError

fn from(_: TableError) -> LuaError

Lift a TableError into a LuaError carrying Value::Nil. Heap-free so it composes with ? in functions that don’t have a &mut Vm. The classification is later refined when the error crosses a Vm boundary (caller can set Vm::set_error_kind if needed).