Enum GraphEngineError 

#[non_exhaustive]
pub enum GraphEngineError {
    ScopeNotEnforceable {
        reason: String,
    },
    Unsupported {
        what: &'static str,
    },
    Unavailable {
        reason: String,
    },
    Deadline,
    Cancelled,
    Internal(String),
}

Engine-side failure vocabulary.

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.

ScopeNotEnforceable

The engine cannot enforce a property of this scope. The port serves the request on the fallback hop and logs the reason — a typed error, never a best-effort weaker predicate.

Fields

reason: String

Unsupported

Fields

what: &'static str

Unavailable

Fields

reason: String

Deadline

Cancelled

Internal(String)

Trait Implementations

impl Debug for GraphEngineError

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

Formats the value using the given formatter.

impl Display for GraphEngineError

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

Formats the value using the given formatter.

impl Error for GraphEngineError

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.