{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"if"}]}
        if obligation.has_escaping_bound_vars() {
    pub(super) fn register_predicate(&self, obligation: traits::PredicateObligation<'tcx>) {
            span_bug!(obligation.cause.span, "escaping bound vars in predicate {:?}", obligation);