Enum VariantSelector 

pub enum VariantSelector {
    Weight(f64),
    When(Expr),
    Else,
}

How one variant of a rule is selected during derivation.

Variants

Weight(f64)

Stochastic: relative weight among the rule’s weighted variants (70% ops | 30% ops). Weights need not sum to 1.

When(Expr)

Guarded: taken when the expression evaluates non-zero, top-down (when(scope.x < 4): ops). A guarded rule’s variants are evaluated in order; the first true guard wins.

Else

Fallback for a guarded rule (else: ops); must be last. In weighted rules else: is parse-time sugar resolved into a Weight of the remaining probability mass, so it never reaches the interpreter.

Trait Implementations

impl Clone for VariantSelector

fn clone(&self) -> VariantSelector

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VariantSelector

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for VariantSelector

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for VariantSelector

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for VariantSelector

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for VariantSelector