{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
                        // Keep all covariant/invariant args. Also if variance is `None`,
                    let Some(ty::Bivariant | ty::Contravariant) = self.variances.get(def_id) else {
                        // then that means it's either not a lifetime, or it didn't show up