Struct VetoExpression 

pub struct VetoExpression {
    pub message: Option<String>,
}

A veto expression that prohibits any valid verdict from the rule

A veto prevents the rule from producing any valid result. This is used for validation and constraint enforcement — distinct from boolean false.

Example: veto "Must be over 18" - blocks the rule entirely with a message

Fields

message: Option<String>

Trait Implementations

impl Clone for VetoExpression

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VetoExpression

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

Formats the value using the given formatter.

impl Display for VetoExpression

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

Formats the value using the given formatter.

impl Eq for VetoExpression

impl Hash for VetoExpression

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for VetoExpression

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for VetoExpression