Enum Absence 

pub enum Absence {
    Degrade,
    Refuse,
}

What a run does when a helper cannot supply a capability.

Variants

Degrade

Continue without it, recording what was not available.

Refuse

Refuse semantic analysis: without this the result would be a weaker answer wearing a stronger name.

Trait Implementations

impl Clone for Absence

fn clone(&self) -> Absence

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Absence

impl Debug for Absence

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

Formats the value using the given formatter.

impl Eq for Absence

impl PartialEq for Absence

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Absence