{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":".opt_param_def_id(self.tcx,"}]}
                                    .opt_param_def_id(self.tcx, self.parent_def_id.to_def_id())
                                    .map_opaque_lifetime_to_parent_lifetime(def_id)
                                    .expect("variable should have been duplicated from parent");