Enum DepError 

pub enum DepError {
    DuplicateRule(String),
    RuleNotFound(String),
    CycleDetected {
        involved: Vec<String>,
    },
    DependencyEndpointMissing {
        from: String,
        to: String,
    },
}

Errors produced by RuleDependencyGraph and EvaluationSchedule.

Variants

DuplicateRule(String)

A rule with this ID was registered more than once.

RuleNotFound(String)

A referenced rule ID does not exist in the graph.

CycleDetected

The graph contains at least one cycle, making topological ordering impossible. involved holds the IDs of the rules participating in the cycle.

Fields

involved: Vec<String>

Rule IDs that are part of the cycle.

DependencyEndpointMissing

At least one endpoint of a dependency edge was not registered.

Fields

from: String

The from rule ID that was not found.

to: String

The to rule ID that was not found.

Trait Implementations

impl Debug for DepError

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

Formats the value using the given formatter.

impl Display for DepError

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

Formats the value using the given formatter.

impl Error for DepError

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.