{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"\"{opaque_lifetime_param_def_id:?}"}]}
            "{opaque_lifetime_param_def_id:?} is a {}",
            matches!(self.def_kind(opaque_lifetime_param_def_id), DefKind::LifetimeParam),
            self.def_descr(opaque_lifetime_param_def_id.to_def_id())