Enum Fallback 

#[non_exhaustive]
pub enum Fallback {
    Code,
    None,
}

An enum for fallback return when the system does not have the requested display name.

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.

Code

Fall back to the BCP-47 code when display name cannot be found

None

Do not fall back, return an error when the display name cannot be found

Trait Implementations

impl Clone for Fallback

fn clone(&self) -> Fallback

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Fallback

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

Formats the value using the given formatter.

impl Default for Fallback

fn default() -> Fallback

Returns the “default value” for a type.

impl PartialEq for Fallback

fn eq(&self, other: &Fallback) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Fallback

impl Eq for Fallback

impl StructuralPartialEq for Fallback