Struct CachedExpansion 

pub struct CachedExpansion {
    pub macro_id: u64,
    pub ns: Arc<str>,
    pub form: Arc<Form>,
}

One memoized macro expansion: valid while the call site resolves to the same macro (macro_id) and is evaluated in the same namespace (ns).

Fields

macro_id: u64

Identity of the macro function that produced form (its first arity’s process-unique id). Redefining the macro mints a new id, so a stale expansion is never reused.

ns: Arc<str>

Namespace the call site was expanded in; ::kw and syntax-quote resolution depend on it.

form: Arc<Form>

The expansion. Held in an Arc so its own nested call sites keep a stable address and therefore their own caches across evaluations.

Trait Implementations

impl Debug for CachedExpansion

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

Formats the value using the given formatter.