{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"rustc_span::hygiene::register_expn_id(self.cnum,"}]}
        rustc_span::hygiene::register_expn_id(self.cnum, index, data, hash)
        let data = self.root.expn_data.get(self, index).unwrap().decode((self, sess));
    }