Enum MapperError 

#[non_exhaustive]
pub enum MapperError {
    WrongLength {
        expected: usize,
        got: usize,
    },
    UnsupportedVersion(u8),
    Invalid(String),
}

Errors produced by mapper save-state load.

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.

WrongLength

Save-state blob is not the length this mapper’s state has: shorter or longer. (Until v2.9.9 the message said “truncated” for a long blob too; NC-14. Until v3.0.0 the variant itself was named Truncated, which said the opposite of half its uses; T-API-EXTENSIBLE.)

Fields

expected: usize

Expected byte count.

got: usize

Actual byte count.

UnsupportedVersion(u8)

Save-state blob carries an unknown version tag.

Invalid(String)

Save-state blob would put the mapper into an inconsistent state.

Trait Implementations

impl Debug for MapperError

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

Formats the value using the given formatter.

impl Display for MapperError

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

Formats the value using the given formatter.

impl Error for MapperError

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.