{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
                    let predicates = self.tcx.predicates_of(def_id);
                if self.tcx.has_attr(def_id, sym::rustc_evaluate_where_clauses) {
                    let predicates = predicates.instantiate(self.tcx, args);