Enum MemoryError 

pub enum MemoryError {
    Invalid(String),
    NotFound(String),
    Conflict(String),
    Concurrent(String),
}

An error the caller can act on. Anything that is not one of these (journal I/O, a poisoned invariant) reaches the caller as a plain anyhow error; downcast with error.downcast_ref::<MemoryError>() to tell the two apart.

Variants

Invalid(String)

The request is malformed or breaks a rule (bad field, unknown superseded id, cycle).

NotFound(String)

The named fact does not exist.

Conflict(String)

The id exists with different content and onIdConflict is reject.

Concurrent(String)

Concurrent writes prevented a coherent plan or recall; retry the operation.

Trait Implementations

impl Debug for MemoryError

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

Formats the value using the given formatter.

impl Display for MemoryError

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

Formats the value using the given formatter.

impl Error for MemoryError

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.