{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
                    // To make `v_o = v_r`, we emit `v_o: v_r` and `v_r: v_o`.
                (GenericArgKind::Lifetime(v_o), GenericArgKind::Lifetime(v_r)) => {
                    if v_o != v_r {