Enum HandlerError 

pub enum HandlerError {
    Internal {
        message: String,
    },
    Unsupported {
        detail: String,
    },
    Custom {
        code: i32,
        message: String,
        data: Option<Value>,
    },
}

Errors a LexHandler method can surface.

A handler that hits an internal failure returns Err(HandlerError::...); the host folds the error into a synthetic diagnostic at the labelled node’s range and continues processing other labels. Subprocess transports map these variants onto JSON-RPC error responses with the standard reserved code ranges (-32000..=-32099 for handler-defined; -32601 for unsupported method/format).

Variants

Internal

Handler hit an internal error (panic, library failure, unexpected state). Maps to JSON-RPC -32603.

Fields

message: String

Unsupported

Handler does not support the requested operation — for example, on_render was called with a format the handler does not produce. Maps to JSON-RPC -32601.

Fields

detail: String

Custom

Handler-defined error. code should fall in the -32000..=-32099 range reserved for handler use. Maps to JSON-RPC error with the supplied code, message, and optional data.

Fields

code: i32

message: String

data: Option<Value>

Implementations

impl HandlerError

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

Convenience constructor for the common case of an internal error.

pub fn unsupported(detail: impl Into<String>) -> Self

Convenience constructor for an unsupported operation.

Trait Implementations

impl Clone for HandlerError

fn clone(&self) -> HandlerError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HandlerError

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

Formats the value using the given formatter.

impl Display for HandlerError

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

Formats the value using the given formatter.

impl Error for HandlerError

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 HandlerError

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for HandlerError