Struct Constraint 

pub struct Constraint {
    pub authored_index: Option<usize>,
    pub body: Vec<BodyLiteral>,
}

A constraint (:- body)

Fields

authored_index: Option<usize>

Stable index of this constraint in the complete authored program.

body: Vec<BodyLiteral>

Body literals whose conjunction must never be satisfiable.

Implementations

impl Constraint

pub fn require_authored_index(&self) -> Result<usize>

Return the authored identity required by prepared compilation paths.

Trait Implementations

impl Clone for Constraint

fn clone(&self) -> Constraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Constraint

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

Formats the value using the given formatter.

impl PartialEq for Constraint

fn eq(&self, other: &Constraint) -> 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 Constraint