Enum ObserverError 

#[non_exhaustive]
pub enum ObserverError {
    BudgetExceeded,
    CapabilityDenied(ObserverCapToken),
    Trapped(&'static str),
    Quarantined,
}

Observer execution outcome.

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.

BudgetExceeded

Observer invocation exceeded the fuel budget. Surfaces only from sandbox-backed hosts; the no-op pass-through never returns this.

CapabilityDenied(ObserverCapToken)

Observer tried to import a host-fn not in its capability set. Rejected at module-load (linker pre-scan) or at the call site (host-fn capability check).

Trapped(&'static str)

Observer invocation trapped at the sandbox boundary — the host catches and quarantines without propagating the unwind (E15.a strengthening of L0 A22).

Quarantined

Observer was placed under quarantine. After repeated panic events (host policy threshold), the observer is removed from the active rotation and its module-digest blacklisted — terminal state distinct from per-invocation Self::Trapped.

Trait Implementations

impl Debug for ObserverError

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

Formats the value using the given formatter.

impl Display for ObserverError

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

Formats the value using the given formatter.

impl Error for ObserverError

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.