Enum PreEvalOutcome 

pub enum PreEvalOutcome {
    Pass,
    Rescope(Arc<Scope>),
    Override(Box<Value>),
}

The outcome of a decorator’s pre-evaluation hook.

A decorator runs before the node it annotates is evaluated. It can either step aside, swap the active scope, or take over the value entirely.

Override boxes its Value to keep the enum small — Value is by far the largest variant payload and most decorators choose Pass.

Variants

Pass

Run the default evaluation path with the existing scope.

Rescope(Arc<Scope>)

Run the default evaluation path, but swap in this scope first. Used by #import to inject the imported module’s bindings.

Override(Box<Value>)

Skip the default evaluation path; use this value as the result. Used by #schema to interpret the body as a schema definition rather than as data.