Enum Legality 

pub enum Legality {
    Legal,
    Dynamic(LegalityCheck),
    Covered(fn(&World, Entity) -> bool),
    Illegal,
}

What a target does with one component name. A name it gives no rule is not written: kept and reported in Mode::Partial, refused in Mode::Full. A writer’s target never carries a name through untouched: it writes its format’s meaning and reports the rest (CONTRIBUTING.md, law 4).

Variants

Legal

The writer writes it.

Dynamic(LegalityCheck)

Legal for the entities the predicate accepts; the others must be lowered.

Covered(fn(&World, Entity) -> bool)

Written through another component: legal on the entities the check accepts (a core.light with the destination’s light it was raised to); on the rest as an unlisted name (kept and reported as not written in Mode::Partial, illegal in Mode::Full). See Target::covered.

Illegal

Must be lowered before writing.

Trait Implementations

impl Clone for Legality

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 Legality

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

Formats the value using the given formatter.