{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"//"}]}
                // We have e.g., `[a, .., b, ..]`. That's no good, error!
            if let Some(rest_span) = rest_span {
                self.ban_extra_rest_pat(rest_span, prev_rest_span.unwrap(), "slice");