{"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
        // ensure that we can get HirId for DefId if need (issue #137708).
        // We need to lower the body even if it's unneeded for never pattern in match,
        let body = arm.body.as_ref().map(|x| self.lower_expr(x));