Enum LcelError 

#[non_exhaustive]
pub enum LcelError {
    Provider(String),
    Chain(String),
    Agent(String),
    Graph(String),
    Tool(String),
    OutputParser(String),
    Stream(String),
    Pipeline(String),
    TypeMismatch(String),
    Other(String),
}

Unified error type for LCEL pipelines.

All Runnable components that participate in LCEL composition must have an Error type that implements Into<LcelError>.

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.

Provider(String)

Error from an LLM provider (OpenAI, Anthropic, Gemini, Ollama, etc.).

Chain(String)

Error from a chain execution.

Agent(String)

Error from an agent execution.

Graph(String)

Error from a graph execution.

Tool(String)

Error from a tool execution.

OutputParser(String)

Error from an output parser.

Stream(String)

Error during streaming.

Pipeline(String)

Error in pipeline composition or execution.

TypeMismatch(String)

Type-erasure downcast failure.

Other(String)

Catch-all for errors that don’t fit other variants.

Trait Implementations

impl Clone for LcelError

fn clone(&self) -> LcelError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LcelError

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

Formats the value using the given formatter.

impl Display for LcelError

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

Formats the value using the given formatter.

impl Error for LcelError

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 From<!> for LcelError

fn from(_: Infallible) -> Self

Converts to this type from the input type.

impl From<CoreError> for LcelError

fn from(err: CoreError) -> Self

Converts to this type from the input type.

impl From<OutputParserError> for LcelError

fn from(e: OutputParserError) -> Self

Converts to this type from the input type.

impl From<ToolError> for LcelError

fn from(e: ToolError) -> Self

Converts to this type from the input type.