{"ast_node_type":"variable","tokens":[{"end":39,"kind":"keyword","start":0,"text":"let"}]}
        let size = arg_abi.layout.size;
    for arg_abi in abi.args.iter().chain(std::iter::once(&abi.ret)) {
        if uses_vector_registers(&arg_abi.mode, &arg_abi.layout.backend_repr) {