{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"(!old_binding.span.is_dummy()"}]}
            (!old_binding.span.is_dummy() && old_binding.span != span).then(|| {
        let old_binding_label =
                let span = self.tcx.sess.source_map().guess_head_span(old_binding.span);