Function enclosing_scope_facts 

pub fn enclosing_scope_facts<'a>(
    index: &dyn CodeUnitIndex,
    file: &ProjectFile,
    scope_facts: &'a HashMap<CodeUnit, LocalBindingsSnapshot<String>>,
    node: Node<'_>,
) -> Option<&'a LocalBindingsSnapshot<String>>

The per-function receiver-type facts enclosing node, if any. Shared by the forward scan (ScanCtx) and the inverted builder (PyScan) so the two paths resolve a receiver’s scope through one place.