Enum TagError 

#[non_exhaustive]
pub enum TagError {
    Empty,
    TooLong,
    Character(char),
    EmptySubtag,
    NoLanguage,
    Language(String),
    Grandfathered,
    Extlang(String),
    Extension(char),
    RepeatedVariant(String),
    PrivateUse,
    Misplaced(String),
}

Why a text isn’t a language tag (LangCode::parse).

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.

Empty

There is no text.

TooLong

The text is longer than 35 characters.

Character(char)

The text holds a character a tag can’t: anything but letters, digits and -.

EmptySubtag

Two - side by side, or one at an end.

NoLanguage

A POSIX locale with no language: C or POSIX.

Language(String)

The first subtag isn’t a language of 2 to 8 letters.

Grandfathered

A grandfathered tag (i-klingon), which the subset leaves out.

Extlang(String)

3 letters right after the language (zh-yue): an extended language subtag, which the subset leaves out.

Extension(char)

An extension (-u-ca-gregory, -t-), which the subset leaves out.

RepeatedVariant(String)

A variant written twice.

PrivateUse

x with nothing after it, or a private-use subtag longer than 8.

Misplaced(String)

A subtag where it can’t be: a script after the region, say.

Trait Implementations

impl Clone for TagError

fn clone(&self) -> TagError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TagError

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

Formats the value using the given formatter.

impl Display for TagError

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

Formats the value using the given formatter.

impl Eq for TagError

impl PartialEq for TagError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TagError