{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"debug!(\"get_upvar_name_and_span_for_region:"}]}
        debug!("get_upvar_name_and_span_for_region: upvar_hir_id={upvar_hir_id:?}");
        let upvar_hir_id = upvars[upvar_index].get_root_variable();