Enum TraceReason 

pub enum TraceReason {
    Asserted(Origin),
    Derived {
        origin: Origin,
        from: Vec<String>,
    },
}

Why a TraceStep atom holds its value.

Variants

Asserted(Origin)

Asserted directly by a FACT / NOT.

Derived

Derived by a RULE whose antecedent atoms all held.

Fields

origin: Origin

Provenance of the firing rule.

from: Vec<String>

Human labels of the antecedent atoms that supported the derivation.

Trait Implementations

impl Clone for TraceReason

fn clone(&self) -> TraceReason

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TraceReason

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

Formats the value using the given formatter.

impl Eq for TraceReason

impl PartialEq for TraceReason

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for TraceReason