Enum MissingVar 

#[non_exhaustive]
pub enum MissingVar {
    Null,
    Error,
}

What a var / val read that finds nothing evaluates to. See EvaluationConfig::missing_var.

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.

Null

null, as JSONLogic specifies.

Error

An ErrorKind::VariableNotFound error naming the path.

Iterators then read every element through the general path, since an inline field read cannot raise. That path is slower; Engine::evaluate_metered charges the same count on either.

Trait Implementations

impl Clone for MissingVar

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 MissingVar

impl Debug for MissingVar

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

Formats the value using the given formatter.

impl Default for MissingVar

fn default() -> Self

Returns the “default value” for a type.

impl Eq for MissingVar

impl PartialEq for MissingVar

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MissingVar