{"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
    let return_type = fn_abi.gcc_type(cx).return_type;
    let fn_abi = cx.fn_abi_of_fn_ptr(rust_fn_sig, ty::List::empty());
    // FIXME(eddyb) find a nicer way to do this.