{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"attr::contains_name(tcx.hir_krate_attrs(),"}]}
            attr::contains_name(tcx.hir_krate_attrs(), sym::rustc_preserve_ub_checks);
        let preserve_ub_checks =
        for block in body.basic_blocks.as_mut() {