{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
                    let ty = Binder::bind_with_vars(ty, bound_vars);
                        self.tcx.late_bound_vars(self.tcx.local_def_id_to_hir_id(fn_id));
                    let ty = self.normalize(hir_ty.span, ty);