{"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"let"}]}
        let found_assoc = |ty: Ty<'tcx>| {
            .any(|info| self.associated_value(info.def_id, item_name).is_some());
            simplify_type(tcx, ty, TreatParams::InstantiateWithInfer)