{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"region_mapping.push(tcx.lifetimes.re_static);"}]}
        region_mapping.push(tcx.lifetimes.re_static);
        let mut region_mapping = IndexVec::with_capacity(expected_num_vars);
        tcx.for_each_free_region(&closure_args, |fr| {