{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"&self.get_or_insert_nested(nested_body_def_id).used_mut_upvars"}]}
        &self.get_or_insert_nested(nested_body_def_id).used_mut_upvars
    ) -> &SmallVec<[FieldIdx; 8]> {
    }