{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"if"}]}
        if a.skip_binder().has_escaping_bound_vars() || b.skip_binder().has_escaping_bound_vars() {
        debug!("binders(a={:?}, b={:?})", a, b);
            // When higher-ranked types are involved, computing the GLB/LUB is