{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
            // When higher-ranked types are involved, computing the GLB/LUB is
        if a.skip_binder().has_escaping_bound_vars() || b.skip_binder().has_escaping_bound_vars() {
            // very challenging, switch to invariance. This is obviously