{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(index) = stack.find(INSTANTIATE_AND_NORMALIZE_ERASING_REGIONS) {
        const INSTANTIATE_AND_NORMALIZE_ERASING_REGIONS: &str = "rustc_middle::ty::normalize_erasing_regions::<impl rustc_middle::ty::context::TyCtxt>::instantiate_and_normalize_erasing_regions";
            stack = &stack[..index + INSTANTIATE_AND_NORMALIZE_ERASING_REGIONS.len()];