{"ast_node_type":"impl","tokens":[{"end":195,"kind":"keyword","start":0,"text":"const"}]}
        const INSTANTIATE_AND_NORMALIZE_ERASING_REGIONS: &str = "rustc_middle::ty::normalize_erasing_regions::<impl rustc_middle::ty::context::TyCtxt>::instantiate_and_normalize_erasing_regions";
        if let Some(index) = stack.find(INSTANTIATE_AND_NORMALIZE_ERASING_REGIONS) {