Enum Error 

#[non_exhaustive]
pub enum Error {
    Nul,
    InvalidName(NameRole),
    InputNameMismatch,
    NoSelectors,
    NoVariants,
    NoKeys,
    UnknownNode,
}

A data model that MF2 syntax cannot represent (see crate::serialize).

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.

Nul

Text or a literal contains U+0000, which MF2 syntax cannot express (the grammar excludes it everywhere and has no escape for it).

InvalidName(NameRole)

A variable, function, option, markup or attribute name is not an MF2 name (or identifier).

InputNameMismatch

An input declaration’s name differs from its variable’s name.

NoSelectors

A select message has no selector (.match needs one).

NoVariants

A select message has no variant.

NoKeys

A variant has no key.

UnknownNode

A message, declaration, key, option value, pattern part or expression of a kind this version does not know (the model’s enums are not exhaustive).

Trait Implementations

impl Clone for Error

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Error

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Eq for Error

impl Error for Error

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.

impl PartialEq for Error

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Error