{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"debug!(\"get_var_name_and_span_for_region(fr={fr:?})\");"}]}
        debug!("get_var_name_and_span_for_region(fr={fr:?})");
    ) -> Option<(Option<Symbol>, Span)> {
        assert!(self.universal_regions().is_universal_region(fr));