Enum ForkError 

pub enum ForkError {
    NotAGraphRun,
    NodeNeverEntered {
        node: String,
    },
}

Why a fork cannot be planned at all, independent of write acknowledgement.

These are the structural refusals: the run is not a graph run, or the fork point is not a node the origin entered. The acknowledgement refusal is not here — it is the caller’s policy over ForkPlan::hazards.

Variants

NotAGraphRun

The origin’s log does not open with Event::GraphRunStarted, so it is an ordinary agent run and has no node boundaries to fork from.

NodeNeverEntered

The origin never entered the requested node (it does not exist in the graph, or the walk routed past it). A fork point must be a node the run actually reached.

Fields

node: String

The requested node id.

Trait Implementations

impl Debug for ForkError

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

Formats the value using the given formatter.

impl Display for ForkError

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

Formats the value using the given formatter.

impl Error for ForkError

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.